crs-l1-paris-lambert93
Map (reference ← swipe → agent)
0:00
Our heat-loss model won't accept the `paris_buildings` file in lat/lon. It needs the coordinates in metres using the standard official projection for the Paris region. Can you convert the buildings over so the model can ingest them? Please leave the attributes alone, and keep every geometry as a plain Polygon rather than turning it into a MultiPolygon. Write the result as a GeoPackage to `paris_buildings_lambert93.gpkg`, and use `id` as the key.
0:00
System info
{
"adapter": "openrouter",
"model": "deepseek/deepseek-v4-flash",
"base_url": "https://openrouter.ai/api/v1"
}
0:04
Let me first explore the working directory to find the input file and understand its structure.
0:04
Bash
ls /work/
paris_buildings_wgs84.geojson
0:07
Let me first read the input file to understand its structure.
0:07
Read
/work/paris_buildings_wgs84.geojson
1 {
2 "type": "FeatureCollection",
3 "name": "paris_buildings_wgs84",
4 "crs": { "type": "name", "properties": { "name": "urn:ogc:def:crs:OGC:1.3:CRS84" } },
5 "features": [
6 { "type": "Feature", "properties": { "id": "007591b9-c632-4d57-8bd2-144f82cfdd73", "class": "apartments", "subtype": "residential", "name": "", "height": null, "num_floors": 4 }, "geometry": { "type": "Polygon", "coordinates": [ [ [ 2.3597498, 48.8570399 ], [ 2.3597608, 48.8570499 ], [ 2.3598145, 48.8571068 ], [ 2.3598435, 48.8571291 ], [ 2.359806, 48.8571492 ], [ 2.3597163, 48.8570555 ], [ 2.3597328, 48.8570478 ], [ 2.3597498, 48.8570399 ] ] ] } },
7 { "type": "Feature", "properties": { "id": "00fac4fe-168a-4116-b287-6a28f34c87df", "class": "hotel", "subtype": "commercial", "name": "Hôtel de Nice", "height": null, "num_floors": 7 }, "geometry": { "type": "Polygon", "coordinates": [ [ [ 2.3558066, 48.8565792 ], [ 2.3558201, 48.8565761 ], [ 2.355847, 48.8566201 ], [ 2.3558588, 48.8566176 ], [ 2.3559027, 48.8566953 ], [ 2.3558801, 48.8567021 ], [ 2.3557818, 48.856724 ], [ 2.3557422, 48.8566535 ], [ 2.3557293, 48.8566307 ], [ 2.355756, 48.856591 ], [ 2.3558066, 48.8565792 ] ] ] } },
8 { "type": "Feature", "properties": { "id": "020eefa5-5685-4f26-bd27-5b2bbd276bec", "class": "apartments", "subtype": "residential", "name": "", "height": null, "num_floors": 7 }, "geometry": { "type": "Polygon", "coordinates": [ [ [ 2.3572011, 48.8572525 ], [ 2.3572582, 48.8572755 ], [ 2.3572304, 48.8572879 ], [ 2.3571022, 48.8573444 ], [ 2.3570724, 48.8573171 ], [ 2.3570455, 48.8572899 ], [ 2.3570759, 48.8572763 ], [ 2.3570906, 48.857296 ], [ 2.3571193, 48.8572856 ], [ 2.3571116, 48.8572727 ], [ 2.3570988, 48.857277 ], [ 2.3570899, 48.8572701 ], [ 2.3571344, 48.8572517 ], [ 2.3570889, 48.8571907 ], [ 2.3571324, 48.8571707 ], [ 2.3571965, 48.8572473 ], [ 2.3572011, 48.8572525 ] ] ] } },
9 { "type": "Feature", "properties": { "id": "030e5772-d9af-4df1-9d7c-75d629eeca2d", "class": "apartments", "subtype": "residential", "name": "", "height": null, "num_floors": 5 }, "geometry": { "type": "Polygon", "coordinates": [ [ [ 2.3576144, 48.8554387 ], [ 2.3575176, 48.8554725 ], [ 2.3574425, 48.8553782 ], [ 2.3575422, 48.8553435 ], [ 2.3576734, 48.8554183 ], [ 2.3576144, 48.8554387 ] ] ] } },
10 { "type": "Feature", "properties": { "id": "0468c0c0-8ee9-4000-a0c1-514c803c86ee", "class": "apartments", "subtype": "residential", "name": "", "height": null, "num_floors": null }, "geometry": { "type": "Polygon", "coordinates": [ [ [ 2.3563341, 48.858202 ], [ 2.3563562, 48.8581947 ], [ 2.3565055, 48.8583418 ], [ 2.3562074, 48.8584452 ], [ 2.3561355, 48.8583597 ], [ 2.3560759, 48.8582882 ], [ 2.3561163, 48.8582744 ], [ 2.3563341, 48.858202 ] ] ] } },
11 { "type": "Feature", "properties": { "id": "04eec0bf-2cf3-436b-be28-5a17310179a4", "class": "apartments", "subtype": "residential", "name": "", "height": null, "num_floors": null }, "geometry": { "type": "Polygon", "coordinates": [ [ [ 2.3593621, 48.8570356 ], [ 2.3593057, 48.8570501 ], [ 2.3593865, 48.8571298 ], [ 2.3592946, 48.8571673 ], [ 2.3592538, 48.8571923 ], [ 2.3591646, 48.8571264 ], [ 2.3591789, 48.8571161 ], [ 2.3591532, 48.8571066 ], [ 2.3591395, 48.8571171 ], [ 2.3591133, 48.8571072 ], [ 2.3591417, 48.8570895 ], [ 2.3591806, 48.8570624 ], [ 2.3591223, 48.8569857 ], [ 2.3591185, 48.8569791 ], [ 2.3592878, 48.8569268 ], [ 2.3593217, 48.8569787 ], [ 2.3593126, 48.8569826 ], [ 2.3593621, 48.8570356 ] ], [ [ 2.3592979, 48.8570841 ], [ 2.359273, 48.8570541 ], [ 2.3592526, 48.8570618 ], [ 2.3592822, 48.8570911 ], [ 2.3592979, 48.8570841 ] ] ] } },
12 { "type": "Feature", "properties": { "id": "051dfb19-9a71-4127-8522-63bf20232528", "class": "apartments", "subtype": "residential", "name": "", "height": null, "num_floors": null }, "geometry": { "type": "Polygon", "coordinates": [ [ [ 2.3581223, 48.8581081 ], [ 2.3580964, 48.8580772 ], [ 2.3584975, 48.857856 ], [ 2.3585364, 48.8578936 ], [ 2.3584542, 48.8579474 ], [ 2.3583045, 48.8580455 ], [ 2.3581774, 48.8581295 ], [ 2.3581578, 48.8581275 ], [ 2.3581367, 48.8581253 ], [ 2.3581223, 48.8581081 ] ] ] } },
13 { "type": "Feature", "properties": { "id": "0707091a-10c6-4669-b6ed-55166847839e", "class": "apartments", "subtype": "residential", "name": "", "height": null, "num_floors": null }, "geometry": { "type": "Polygon", "coordinates": [ [ [ 2.3573039, 48.8571135 ], [ 2.3572826, 48.8571208 ], [ 2.3572282, 48.8570585 ], [ 2.357222, 48.8570514 ], [ 2.3571732, 48.8569955 ], [ 2.3573448, 48.8569306 ], [ 2.3573136, 48.856893 ], [ 2.3574243, 48.8568539 ], [ 2.3575378, 48.8568138 ], [ 2.3575632, 48.8568051 ], [ 2.3576794, 48.8567629 ], [ 2.3578134, 48.8567165 ], [ 2.3578419, 48.8567066 ], [ 2.3579102, 48.8566833 ], [ 2.3580018, 48.8567988 ], [ 2.3579785, 48.8568061 ], [ 2.3578495, 48.8568467 ], [ 2.3578249, 48.8568547 ], [ 2.3577854, 48.8568662 ], [ 2.3576943, 48.8569005 ], [ 2.357741, 48.8569661 ], [ 2.3577062, 48.8569778 ], [ 2.3576648, 48.8569913 ], [ 2.3575549, 48.8570275 ], [ 2.3573039, 48.8571135 ] ], [ [ 2.3575937, 48.8568607 ], [ 2.3575442, 48.8568789 ], [ 2.3573572, 48.8569455 ], [ 2.3573748, 48.8569681 ], [ 2.3573225, 48.8569871 ], [ 2.3573677, 48.8570433 ], [ 2.3574221, 48.8570234 ], [ 2.3574185, 48.8570203 ], [ 2.3575226, 48.8569831 ], [ 2.3575195, 48.8569766 ], [ 2.3575983, 48.8569478 ], [ 2.3576068, 48.8569586 ], [ 2.3576598, 48.8569415 ], [ 2.3575937, 48.8568607 ] ] ] } },
14 { "type": "Feature", "properties": { "id": "07142702-50fc-4469-9fec-687e5719d2e5", "class": "", "subtype": "", "name": "", "height": null, "num_floors": 5 }, "geometry": { "type": "Polygon", "coordinates": [ [ [ 2.3573095, 48.8587292 ], [ 2.3572626, 48.8586874 ], [ 2.3573894, 48.8586176 ], [ 2.3574152, 48.85864 ], [ 2.3574534, 48.858621 ], [ 2.3574255, 48.8585971 ], [ 2.3574634, 48.8585761 ], [ 2.3575101, 48.8586154 ], [ 2.3574314, 48.8586636 ], [ 2.3574052, 48.8586809 ], [ 2.3573095, 48.8587292 ] ] ] } },
15 { "type": "Feature", "properties": { "id": "071f77d5-75e3-4a98-89de-44f9a945aa44", "class": "apartments", "subtype": "residential", "name": "", "height": null, "num_floors": 6 }, "geometry": { "type": "Polygon", "coordinates": [ [ [ 2.3565534, 48.8564198 ], [ 2.3565814, 48.8564286 ], [ 2.3566114, 48.8564826 ], [ 2.3564514, 48.8565169 ], [ 2.3564064, 48.8564365 ], [ 2.3564507, 48.8564258 ], [ 2.3565194, 48.8564091 ], [ 2.3565534, 48.8564198 ] ] ] } },
16 { "type": "Feature", "properties": { "id": "07949552-5a76-4fe6-ba80-efa54e8b0688", "class": "apartments", "subtype": "residential", "name": "", "height": null, "num_floors": 6 }, "geometry": { "type": "Polygon", "coordinates": [ [ [ 2.3563841, 48.8579286 ], [ 2.3564188, 48.8579083 ], [ 2.3564408, 48.8578943 ], [ 2.3564942, 48.8579492 ], [ 2.3564604, 48.857966 ], [ 2.3564275, 48.8579796 ], [ 2.3563841, 48.8579286 ] ] ] } },
17 { "type": "Feature", "properties": { "id": "07ae479c-aa1a-4096-8c0d-4aa3d77d6c68", "class": "apartments", "subtype": "residential", "name": "", "height": null, "num_floors": null }, "geometry": { "type": "Polygon", "coordinates": [ [ [ 2.3558582, 48.8583412 ], [ 2.3558805, 48.8583346 ], [ 2.3559207, 48.8583788 ], [ 2.3559434, 48.8584057 ], [ 2.3559652, 48.8583978 ], [ 2.3559826, 48.858419 ], [ 2.3559799, 48.8584201 ], [ 2.3559791, 48.8584223 ], [ 2.3559256, 48.8584407 ], [ 2.3559394, 48.8584582 ], [ 2.355925, 48.8584647 ], [ 2.3559556, 48.8585025 ], [ 2.3559606, 48.8585011 ], [ 2.3559961, 48.8585458 ], [ 2.3560893, 48.8585128 ], [ 2.3562946, 48.8587651 ], [ 2.3562546, 48.8587793 ], [ 2.3562817, 48.8588068 ], [ 2.3561865, 48.8588431 ], [ 2.3561537, 48.8588004 ], [ 2.3561489, 48.8588015 ], [ 2.3560707, 48.8587033 ], [ 2.3559915, 48.8586048 ], [ 2.3557874, 48.8583621 ], [ 2.3558582, 48.8583412 ] ] ] } },
18 { "type": "Feature", "properties": { "id": "085195c0-034d-4763-994a-37cf71a53f1b", "class": "apartments", "subtype": "residential", "name": "", "height": null, "num_floors": 3 }, "geometry": { "type": "Polygon", "coordinates": [ [ [ 2.3570164, 48.8568157 ], [ 2.3570464, 48.8568041 ], [ 2.3571038, 48.8567839 ], [ 2.3571104, 48.8567891 ], [ 2.3571663, 48.8567698 ], [ 2.3572235, 48.8567482 ], [ 2.357284, 48.8567257 ], [ 2.3573256, 48.8567861 ], [ 2.357207, 48.8568283 ], [ 2.3570701, 48.8568769 ], [ 2.3570214, 48.8568214 ], [ 2.3570164, 48.8568157 ] ] ] } },
19 { "type": "Feature", "properties": { "id": "08e6b740-11e7-434c-8387-97797166f85a", "class": "apartments", "subtype": "residential", "name": "", "height": null, "num_floors": 5 }, "geometry": { "type": "Polygon", "coordinates": [ [ [ 2.3573754, 48.8587838 ], [ 2.3573095, 48.8587292 ], [ 2.3574052, 48.8586809 ], [ 2.3574314, 48.8586636 ], [ 2.3574943, 48.8587156 ], [ 2.35745, 48.858741 ], [ 2.3574313, 48.8587518 ], [ 2.3573786, 48.858782 ], [ 2.3573754, 48.8587838 ] ] ] } },
20 { "type": "Feature", "properties": { "id": "0955376b-191f-4230-85e0-7c79b20a94ba", "class": "apartments", "subtype": "residential", "name": "", "height": null, "num_floors": null }, "geometry": { "type": "Polygon", "coordinates": [ [ [ 2.3576954, 48.8575906 ], [ 2.3576496, 48.857536 ], [ 2.3578871, 48.8574519 ], [ 2.3579379, 48.8574355 ], [ 2.3579755, 48.8574873 ], [ 2.3579546, 48.8574944 ], [ 2.3579672, 48.8575123 ], [ 2.3578471, 48.8575511 ], [ 2.3577027, 48.8575994 ], [ 2.3576954, 48.8575906 ] ] ] } },
21 { "type": "Feature", "properties": { "id": "09aaab89-ed75-4ff6-8d79-8edd33d514c5", "class": "apartments", "subtype": "residential", "name": "", "height": null, "num_floors": 7 }, "geometry": { "type": "Polygon", "coordinates": [ [ [ 2.3560028, 48.8551625 ], [ 2.3560263, 48.8551528 ], [ 2.3560672, 48.8551971 ], [ 2.356064, 48.855198 ], [ 2.3560662, 48.8552006 ], [ 2.3560224, 48.8552195 ], [ 2.3560367, 48.855235 ], [ 2.35604, 48.855235 ], [ 2.3560463, 48.855237 ], [ 2.3560506, 48.8552401 ], [ 2.3560494, 48.8552452 ], [ 2.3560438, 48.8552485 ], [ 2.356038, 48.8552488 ], [ 2.3560323, 48.8552474 ], [ 2.3560157, 48.8552542 ], [ 2.3560411, 48.8552811 ], [ 2.3561543, 48.8552475 ], [ 2.3561866, 48.855278 ], [ 2.3561614, 48.8552858 ], [ 2.356179, 48.8553112 ], [ 2.3560917, 48.8553387 ], [ 2.3560146, 48.855362 ], [ 2.3559365, 48.8552825 ], [ 2.3558705, 48.855217 ], [ 2.3558719, 48.8552164 ], [ 2.3560028, 48.8551625 ] ] ] } },
22 { "type": "Feature", "properties": { "id": "0ab38a16-9598-4a16-a960-4ebbd0fc7ada", "class": "apartments", "subtype": "residential", "name": "", "height": null, "num_floors": null }, "geometry": { "type": "Polygon", "coordinates": [ [ [ 2.3574497, 48.8574693 ], [ 2.3574463, 48.8574714 ], [ 2.3573529, 48.8575075 ], [ 2.3573369, 48.8574886 ], [ 2.3573344, 48.8574896 ], [ 2.3573194, 48.8574711 ], [ 2.3572795, 48.8574861 ], [ 2.357277, 48.8574843 ], [ 2.3572383, 48.8574418 ], [ 2.3571735, 48.8574694 ], [ 2.3571142, 48.8574879 ], [ 2.3570758, 48.8575055 ], [ 2.3570696, 48.8574997 ], [ 2.3570287, 48.8574529 ], [ 2.3570831, 48.8574296 ], [ 2.3570761, 48.8574211 ], [ 2.3570928, 48.8574137 ], [ 2.3571011, 48.8574221 ], [ 2.357121, 48.8574131 ], [ 2.3571569, 48.8574513 ], [ 2.3572218, 48.8574258 ], [ 2.357226, 48.8574304 ], [ 2.3572905, 48.8574064 ], [ 2.3572805, 48.8573949 ], [ 2.3572495, 48.8574048 ], [ 2.3572351, 48.8573884 ], [ 2.3572014, 48.857401 ], [ 2.3571989, 48.8573985 ], [ 2.3571851, 48.8574031 ], [ 2.3571756, 48.8573924 ], [ 2.3571958, 48.857386 ], [ 2.3572378, 48.8573678 ], [ 2.357339, 48.8573322 ], [ 2.3573729, 48.8573742 ], [ 2.3574497, 48.8574693 ] ] ] } },
23 { "type": "Feature", "properties": { "id": "0b650811-a7b0-4e14-95ef-81c98f951817", "class": "apartments", "subtype": "residential", "name": "", "height": null, "num_floors": 4 }, "geometry": { "type": "Polygon", "coordinates": [ [ [ 2.3566755, 48.8557147 ], [ 2.3566278, 48.8557216 ], [ 2.3565692, 48.8556485 ], [ 2.3566069, 48.8556342 ], [ 2.3565763, 48.8555981 ], [ 2.35654, 48.8556097 ], [ 2.356492, 48.8555544 ], [ 2.3564174, 48.8554668 ], [ 2.3566897, 48.8553612 ], [ 2.3567438, 48.855423 ], [ 2.3566107, 48.8554751 ], [ 2.3567103, 48.8555782 ], [ 2.3567396, 48.855566 ], [ 2.3567533, 48.8555891 ], [ 2.3567627, 48.855586 ], [ 2.3567649, 48.8555895 ], [ 2.3567563, 48.8555922 ], [ 2.3567704, 48.8556158 ], [ 2.3567667, 48.8556168 ], [ 2.3567289, 48.8556275 ], [ 2.3566596, 48.8556496 ], [ 2.3567034, 48.8557106 ], [ 2.3566824, 48.8557137 ], [ 2.3566755, 48.8557147 ] ] ] } },
24 { "type": "Feature", "properties": { "id": "0beccd40-8386-493f-a547-4dd573559748", "class": "apartments", "subtype": "residential", "name": "", "height": null, "num_floors": 6 }, "geometry": { "type": "Polygon", "coordinates": [ [ [ 2.356486, 48.858073 ], [ 2.3564609, 48.8580824 ], [ 2.3564036, 48.8580163 ], [ 2.3564507, 48.8579972 ], [ 2.3564525, 48.8579987 ], [ 2.3564776, 48.8579891 ], [ 2.3565264, 48.8579705 ], [ 2.3565844, 48.8580359 ], [ 2.3565228, 48.8580591 ], [ 2.3565044, 48.8580661 ], [ 2.356486, 48.858073 ] ] ] } },
25 { "type": "Feature", "properties": { "id": "0d89e6c6-1d04-4573-88eb-795ea33bc50d", "class": "apartments", "subtype": "residential", "name": "", "height": null, "num_floors": 4 }, "geometry": { "type": "Polygon", "coordinates": [ [ [ 2.3567793, 48.8559812 ], [ 2.356839, 48.8559664 ], [ 2.3568575, 48.8559989 ], [ 2.3568362, 48.8560064 ], [ 2.3568113, 48.8560108 ], [ 2.3567973, 48.8560126 ], [ 2.3567793, 48.8559812 ] ] ] } },
26 { "type": "Feature", "properties": { "id": "0dcc6fe5-c970-4170-80d8-3d962b7bc51b", "class": "apartments", "subtype": "residential", "name": "", "height": null, "num_floors": null }, "geometry": { "type": "Polygon", "coordinates": [ [ [ 2.3594246, 48.8563307 ], [ 2.3594043, 48.856304 ], [ 2.3595172, 48.8562749 ], [ 2.3595446, 48.8562663 ], [ 2.3595743, 48.8562567 ], [ 2.3596172, 48.8562487 ], [ 2.359687, 48.8562311 ], [ 2.3597882, 48.8561999 ], [ 2.3597954, 48.856198 ], [ 2.3598245, 48.85625 ], [ 2.3597017, 48.8562829 ], [ 2.3596328, 48.8562969 ], [ 2.3594375, 48.8563476 ], [ 2.3594246, 48.8563307 ] ] ] } },
27 { "type": "Feature", "properties": { "id": "0ea61287-e9c8-4fc5-9301-d687961b1b1f", "class": "apartments", "subtype": "residential", "name": "", "height": null, "num_floors": null }, "geometry": { "type": "Polygon", "coordinates": [ [ [ 2.3592343, 48.8562386 ], [ 2.359255, 48.8562638 ], [ 2.3591573, 48.8562991 ], [ 2.3591592, 48.8563013 ], [ 2.3590655, 48.8563367 ], [ 2.3590533, 48.8563221 ], [ 2.3590359, 48.8562971 ], [ 2.3592199, 48.856221 ], [ 2.3592343, 48.8562386 ] ] ] } },
28 { "type": "Feature", "properties": { "id": "0eb94faf-cf2e-4865-868c-c0d91e9f1123", "class": "apartments", "subtype": "residential", "name": "", "height": null, "num_floors": 6 }, "geometry": { "type": "Polygon", "coordinates": [ [ [ 2.3577253, 48.8561227 ], [ 2.357805, 48.8561037 ], [ 2.3579176, 48.8560769 ], [ 2.3579445, 48.8560851 ], [ 2.3579549, 48.8560883 ], [ 2.3579691, 48.8561139 ], [ 2.3580293, 48.8562222 ], [ 2.3580218, 48.8562347 ], [ 2.358014, 48.8562477 ], [ 2.3579288, 48.8562717 ], [ 2.3578376, 48.8562973 ], [ 2.3577253, 48.8561227 ] ], [ [ 2.3578924, 48.856208 ], [ 2.3578839, 48.8561949 ], [ 2.3578647, 48.8561902 ], [ 2.3578555, 48.8561924 ], [ 2.3578708, 48.8562137 ], [ 2.3578924, 48.856208 ] ] ] } },
29 { "type": "Feature", "properties": { "id": "0f3d6053-1b68-4f86-b074-a5b3d50414a4", "class": "apartments", "subtype": "residential", "name": "", "height": null, "num_floors": 7 }, "geometry": { "type": "Polygon", "coordinates": [ [ [ 2.3557145, 48.8588273 ], [ 2.3557027, 48.8588158 ], [ 2.3560707, 48.8587033 ], [ 2.3561489, 48.8588015 ], [ 2.3559908, 48.8588541 ], [ 2.3559223, 48.8588769 ], [ 2.355904, 48.8588527 ], [ 2.3558781, 48.8588605 ], [ 2.355896, 48.8588851 ], [ 2.3558741, 48.858893 ], [ 2.3558115, 48.8589223 ], [ 2.3557145, 48.8588273 ] ] ] } },
30 { "type": "Feature", "properties": { "id": "11807152-4eb7-4130-835e-2347d8b9e4f1", "class": "", "subtype": "", "name": "", "height": null, "num_floors": 5 }, "geometry": { "type": "Polygon", "coordinates": [ [ [ 2.3563973, 48.857121 ], [ 2.3563337, 48.8570419 ], [ 2.3564594, 48.8569979 ], [ 2.3564725, 48.8569937 ], [ 2.3564995, 48.8570252 ], [ 2.3564078, 48.857055 ], [ 2.3564466, 48.8571046 ], [ 2.3563973, 48.857121 ] ] ] } },
31 { "type": "Feature", "properties": { "id": "12684386-ee11-419b-a54c-90b751ee5aa9", "class": "apartments", "subtype": "residential", "name": "", "height": null, "num_floors": 7 }, "geometry": { "type": "Polygon", "coordinates": [ [ [ 2.3597739, 48.8556349 ], [ 2.3598526, 48.8556159 ], [ 2.3599261, 48.8557395 ], [ 2.359874, 48.8557533 ], [ 2.3598258, 48.8557662 ], [ 2.3598159, 48.8557688 ], [ 2.3597627, 48.8557829 ], [ 2.3597086, 48.8557972 ], [ 2.3596373, 48.8556679 ], [ 2.3597739, 48.8556349 ] ] ] } },
32 { "type": "Feature", "properties": { "id": "12e2d20e-f1f6-4c7d-ba4c-a4b93252a731", "class": "apartments", "subtype": "residential", "name": "", "height": null, "num_floors": null }, "geometry": { "type": "Polygon", "coordinates": [ [ [ 2.3559141, 48.857305 ], [ 2.3559174, 48.8573076 ], [ 2.3559924, 48.8572653 ], [ 2.3560675, 48.8573562 ], [ 2.3561116, 48.8574095 ], [ 2.3560541, 48.8574412 ], [ 2.3560311, 48.8574086 ], [ 2.3559539, 48.857446 ], [ 2.3558263, 48.8575065 ], [ 2.3556874, 48.8575685 ], [ 2.3556635, 48.8575768 ], [ 2.355615, 48.8575093 ], [ 2.3555591, 48.8574314 ], [ 2.3555522, 48.8574219 ], [ 2.3556736, 48.8573612 ], [ 2.3558296, 48.8572783 ], [ 2.3558909, 48.8573287 ], [ 2.3559141, 48.857305 ] ], [ [ 2.3558971, 48.8573832 ], [ 2.3558537, 48.8573381 ], [ 2.3557676, 48.8573798 ], [ 2.3557612, 48.8573737 ], [ 2.3557023, 48.8574025 ], [ 2.3557294, 48.8574379 ], [ 2.3557342, 48.8574364 ], [ 2.3557396, 48.8574381 ], [ 2.3557545, 48.8574606 ], [ 2.3557526, 48.8574641 ], [ 2.3557488, 48.8574649 ], [ 2.3557661, 48.8574883 ], [ 2.3558226, 48.8574594 ], [ 2.3558138, 48.8574517 ], [ 2.3559234, 48.8573991 ], [ 2.3559059, 48.8573802 ], [ 2.3558971, 48.8573832 ] ] ] } },
33 { "type": "Feature", "properties": { "id": "136f1702-b9ff-44a1-b645-b059d43ed69a", "class": "apartments", "subtype": "residential", "name": "", "height": null, "num_floors": 5 }, "geometry": { "type": "Polygon", "coordinates": [ [ [ 2.3568913, 48.8559308 ], [ 2.3568854, 48.8559315 ], [ 2.3568823, 48.8559248 ], [ 2.3568679, 48.8559272 ], [ 2.3568584, 48.8558976 ], [ 2.3568795, 48.8558941 ], [ 2.35691, 48.8558883 ], [ 2.3569426, 48.855882 ], [ 2.356946, 48.8558897 ], [ 2.3569587, 48.8559192 ], [ 2.3569339, 48.8559246 ], [ 2.3569399, 48.8559335 ], [ 2.3569656, 48.8559715 ], [ 2.3568575, 48.8559989 ], [ 2.356839, 48.8559664 ], [ 2.3568385, 48.8559625 ], [ 2.3568989, 48.8559464 ], [ 2.3568913, 48.8559308 ] ] ] } },
34 { "type": "Feature", "properties": { "id": "139f7d8a-d50b-479f-bb19-9be5f8f84596", "class": "", "subtype": "", "name": "", "height": null, "num_floors": null }, "geometry": { "type": "Polygon", "coordinates": [ [ [ 2.3582651, 48.8574089 ], [ 2.3583018, 48.8573947 ], [ 2.3586154, 48.8572792 ], [ 2.3586849, 48.8573555 ], [ 2.3585554, 48.8574041 ], [ 2.3583857, 48.857466 ], [ 2.3583806, 48.8574677 ], [ 2.3583601, 48.8574435 ], [ 2.3583095, 48.857461 ], [ 2.358243, 48.8574817 ], [ 2.3581985, 48.8574347 ], [ 2.3582246, 48.8574246 ], [ 2.3582651, 48.8574089 ] ] ] } },
35 { "type": "Feature", "properties": { "id": "14f13c41-f7b9-4a0a-8656-3229b31943dc", "class": "apartments", "subtype": "residential", "name": "", "height": null, "num_floors": 6 }, "geometry": { "type": "Polygon", "coordinates": [ [ [ 2.3584226, 48.8555406 ], [ 2.3584239, 48.8555423 ], [ 2.3584608, 48.8556321 ], [ 2.358402, 48.8556439 ], [ 2.3583542, 48.8555468 ], [ 2.358354, 48.8555446 ], [ 2.3583822, 48.855543 ], [ 2.3584226, 48.8555406 ] ] ] } },
36 { "type": "Feature", "properties": { "id": "156fa2fa-e50f-41cf-9043-e4ee724dbc39", "class": "apartments", "subtype": "residential", "name": "", "height": null, "num_floors": null }, "geometry": { "type": "Polygon", "coordinates": [ [ [ 2.3573894, 48.8586176 ], [ 2.3572626, 48.8586874 ], [ 2.3572251, 48.8586542 ], [ 2.3571924, 48.8586253 ], [ 2.3571514, 48.8585889 ], [ 2.3572865, 48.8585264 ], [ 2.3573258, 48.858508 ], [ 2.3573688, 48.8584868 ], [ 2.3573994, 48.8585152 ], [ 2.3574634, 48.8585761 ], [ 2.3574255, 48.8585971 ], [ 2.3573894, 48.8586176 ] ], [ [ 2.3574033, 48.8585705 ], [ 2.3573607, 48.8585345 ], [ 2.3572604, 48.8585879 ], [ 2.3573044, 48.8586277 ], [ 2.3574033, 48.8585705 ] ] ] } },
37 { "type": "Feature", "properties": { "id": "15f0846c-7bf4-4993-97c3-1a152a04af56", "class": "", "subtype": "", "name": "", "height": null, "num_floors": null }, "geometry": { "type": "Polygon", "coordinates": [ [ [ 2.358629, 48.8577491 ], [ 2.3585121, 48.8576742 ], [ 2.3585247, 48.8576498 ], [ 2.3585561, 48.8576381 ], [ 2.3586281, 48.8576112 ], [ 2.3586987, 48.8576758 ], [ 2.3587484, 48.8577191 ], [ 2.358825, 48.8577787 ], [ 2.3587547, 48.8578172 ], [ 2.3587359, 48.8578176 ], [ 2.358629, 48.8577491 ] ], [ [ 2.3587269, 48.8577327 ], [ 2.3586634, 48.8576808 ], [ 2.3586276, 48.8576979 ], [ 2.3587204, 48.8577581 ], [ 2.358734, 48.8577497 ], [ 2.3587269, 48.8577327 ] ] ] } },
38 { "type": "Feature", "properties": { "id": "174df365-dbc6-41e5-a24f-280083ca1c3d", "class": "apartments", "subtype": "residential", "name": "", "height": null, "num_floors": 6 }, "geometry": { "type": "Polygon", "coordinates": [ [ [ 2.359254, 48.8578839 ], [ 2.3594444, 48.8577271 ], [ 2.3598235, 48.8580473 ], [ 2.3596931, 48.8581136 ], [ 2.3595598, 48.8581825 ], [ 2.359188, 48.8579336 ], [ 2.359254, 48.8578839 ] ], [ [ 2.3595791, 48.8579219 ], [ 2.3593694, 48.8580298 ], [ 2.3594534, 48.8580855 ], [ 2.3594726, 48.8580862 ], [ 2.3594806, 48.8580914 ], [ 2.3596709, 48.8579958 ], [ 2.3596625, 48.8579882 ], [ 2.3596598, 48.8579888 ], [ 2.3595791, 48.8579219 ] ] ] } },
39 { "type": "Feature", "properties": { "id": "17932e49-6775-4e61-815b-0241968b2577", "class": "apartments", "subtype": "residential", "name": "", "height": null, "num_floors": 6 }, "geometry": { "type": "Polygon", "coordinates": [ [ [ 2.3593605, 48.8562439 ], [ 2.3593423, 48.8562191 ], [ 2.3594217, 48.8561945 ], [ 2.359432, 48.856207 ], [ 2.3594826, 48.856194 ], [ 2.3595024, 48.856229 ], [ 2.3594798, 48.8562335 ], [ 2.3593769, 48.8562664 ], [ 2.3593605, 48.8562439 ] ] ] } },
40 { "type": "Feature", "properties": { "id": "1a1a00d8-08b9-4201-83c8-ab8436de0b28", "class": "apartments", "subtype": "residential", "name": "", "height": null, "num_floors": 7 }, "geometry": { "type": "Polygon", "coordinates": [ [ [ 2.3572522, 48.8559151 ], [ 2.3573082, 48.8560118 ], [ 2.3572885, 48.8560165 ], [ 2.3571759, 48.8560435 ], [ 2.3571389, 48.8560319 ], [ 2.3571005, 48.8559621 ], [ 2.357101, 48.8559606 ], [ 2.3572068, 48.8559297 ], [ 2.3572133, 48.8559426 ], [ 2.3572468, 48.8559352 ], [ 2.3572398, 48.8559192 ], [ 2.3572522, 48.8559151 ] ] ] } },
41 { "type": "Feature", "properties": { "id": "1b63b7ea-266c-48c9-8361-20386a70e868", "class": "apartments", "subtype": "residential", "name": "", "height": null, "num_floors": 6 }, "geometry": { "type": "Polygon", "coordinates": [ [ [ 2.3576058, 48.8564734 ], [ 2.35766, 48.8564572 ], [ 2.3577158, 48.8565192 ], [ 2.3577311, 48.8565386 ], [ 2.3576081, 48.8565803 ], [ 2.357597, 48.8565659 ], [ 2.3575904, 48.8565565 ], [ 2.3575462, 48.8564913 ], [ 2.3576058, 48.8564734 ] ] ] } },
42 { "type": "Feature", "properties": { "id": "1c4ca879-1c39-4dc2-8498-3a87203de47f", "class": "", "subtype": "", "name": "", "height": null, "num_floors": 6 }, "geometry": { "type": "Polygon", "coordinates": [ [ [ 2.3588733, 48.857508 ], [ 2.3589068, 48.8574904 ], [ 2.3590154, 48.8575707 ], [ 2.3589569, 48.8576006 ], [ 2.3588517, 48.8575193 ], [ 2.3588733, 48.857508 ] ] ] } },
43 { "type": "Feature", "properties": { "id": "1c5f406a-b22b-42fe-ad8e-f3ba87b7e809", "class": "apartments", "subtype": "residential", "name": "", "height": null, "num_floors": null }, "geometry": { "type": "Polygon", "coordinates": [ [ [ 2.3584202, 48.856227 ], [ 2.3584716, 48.8562136 ], [ 2.3585774, 48.8563574 ], [ 2.3585993, 48.8563962 ], [ 2.3585576, 48.8564113 ], [ 2.3585824, 48.8564386 ], [ 2.3585928, 48.8564624 ], [ 2.3587086, 48.8566065 ], [ 2.3586635, 48.8566311 ], [ 2.3586274, 48.856587 ], [ 2.3586004, 48.8565522 ], [ 2.3585809, 48.8565301 ], [ 2.3585551, 48.8564982 ], [ 2.3585291, 48.8564656 ], [ 2.3585174, 48.8564499 ], [ 2.3584848, 48.8564108 ], [ 2.3584492, 48.8563669 ], [ 2.3584493, 48.8563629 ], [ 2.3584841, 48.8563501 ], [ 2.3584534, 48.8563054 ], [ 2.3583869, 48.8563241 ], [ 2.3583647, 48.8562942 ], [ 2.3583643, 48.8562925 ], [ 2.3583772, 48.856289 ], [ 2.3583454, 48.8562452 ], [ 2.3584102, 48.8562296 ], [ 2.3584202, 48.856227 ] ] ] } },
44 { "type": "Feature", "properties": { "id": "1cd0d43c-4a10-40a9-8b01-3059b4cf10fd", "class": "apartments", "subtype": "residential", "name": "", "height": null, "num_floors": null }, "geometry": { "type": "Polygon", "coordinates": [ [ [ 2.3592517, 48.8564311 ], [ 2.3593544, 48.8564003 ], [ 2.3593555, 48.8564017 ], [ 2.3594164, 48.856482 ], [ 2.3594511, 48.8565277 ], [ 2.3590398, 48.85665 ], [ 2.3590218, 48.8566238 ], [ 2.3589933, 48.8566308 ], [ 2.3590102, 48.8566581 ], [ 2.3588635, 48.8567021 ], [ 2.3588417, 48.8566795 ], [ 2.358825, 48.8566631 ], [ 2.3587677, 48.8565757 ], [ 2.3589666, 48.8565183 ], [ 2.3591591, 48.8564599 ], [ 2.3592517, 48.8564311 ] ], [ [ 2.3591466, 48.856561 ], [ 2.3592718, 48.8565202 ], [ 2.3592349, 48.8564702 ], [ 2.35912, 48.8565067 ], [ 2.3591082, 48.8565014 ], [ 2.3591051, 48.8565016 ], [ 2.3591466, 48.856561 ] ] ] } },
45 { "type": "Feature", "properties": { "id": "1edb376f-1763-4d59-b898-9e5466709aaa", "class": "apartments", "subtype": "residential", "name": "", "height": null, "num_floors": 6 }, "geometry": { "type": "Polygon", "coordinates": [ [ [ 2.3559429, 48.8570303 ], [ 2.3559381, 48.857024 ], [ 2.3560427, 48.8569886 ], [ 2.3560649, 48.8570166 ], [ 2.3560089, 48.8570409 ], [ 2.3559638, 48.8570578 ], [ 2.3559429, 48.8570303 ] ] ] } },
46 { "type": "Feature", "properties": { "id": "1faa361b-82b4-4508-b325-c65f5c76e54b", "class": "apartments", "subtype": "residential", "name": "", "height": null, "num_floors": 6 }, "geometry": { "type": "Polygon", "coordinates": [ [ [ 2.3558725, 48.8571011 ], [ 2.3558609, 48.8571078 ], [ 2.3557954, 48.8571539 ], [ 2.3557391, 48.8571892 ], [ 2.3557035, 48.8571575 ], [ 2.3557003, 48.8571544 ], [ 2.3557515, 48.857125 ], [ 2.3558191, 48.8570417 ], [ 2.3558306, 48.8570545 ], [ 2.3558725, 48.8571011 ] ] ] } },
47 { "type": "Feature", "properties": { "id": "20cbe391-fe62-4d7f-aa49-44eff06c5bbf", "class": "", "subtype": "", "name": "", "height": null, "num_floors": null }, "geometry": { "type": "Polygon", "coordinates": [ [ [ 2.3594199, 48.8584421 ], [ 2.3597447, 48.8587117 ], [ 2.3596346, 48.8587951 ], [ 2.3594877, 48.85871 ], [ 2.3592442, 48.8588936 ], [ 2.3592389, 48.8588986 ], [ 2.3591595, 48.8588614 ], [ 2.3589832, 48.8587787 ], [ 2.3591123, 48.8586787 ], [ 2.3592234, 48.858731 ], [ 2.3592121, 48.8587404 ], [ 2.3592805, 48.8587726 ], [ 2.3593043, 48.8587551 ], [ 2.3592985, 48.8587522 ], [ 2.359321, 48.8587339 ], [ 2.3593272, 48.8587375 ], [ 2.3593761, 48.8587048 ], [ 2.3593718, 48.8587014 ], [ 2.3594197, 48.8586656 ], [ 2.3594249, 48.858668 ], [ 2.3594317, 48.8586636 ], [ 2.3594374, 48.8586629 ], [ 2.3594466, 48.8586646 ], [ 2.3594972, 48.8587018 ], [ 2.3595678, 48.8586563 ], [ 2.3594068, 48.8585305 ], [ 2.3593276, 48.8585887 ], [ 2.3593813, 48.858625 ], [ 2.3592543, 48.8587202 ], [ 2.3591314, 48.8586637 ], [ 2.3592529, 48.8585703 ], [ 2.3593361, 48.8585055 ], [ 2.3593331, 48.8585026 ], [ 2.3594199, 48.8584421 ] ] ] } },
48 { "type": "Feature", "properties": { "id": "20eeabcc-e931-4293-b3cb-c59a5801136d", "class": "apartments", "subtype": "residential", "name": "", "height": null, "num_floors": null }, "geometry": { "type": "Polygon", "coordinates": [ [ [ 2.356492, 48.8555544 ], [ 2.3563839, 48.8555924 ], [ 2.3563761, 48.8555821 ], [ 2.3563537, 48.8555401 ], [ 2.3563465, 48.8555276 ], [ 2.3564143, 48.8555037 ], [ 2.3563889, 48.8554732 ], [ 2.3563275, 48.8554955 ], [ 2.3563215, 48.8554857 ], [ 2.3563101, 48.8554647 ], [ 2.3563743, 48.855419 ], [ 2.3563772, 48.8554192 ], [ 2.3564174, 48.8554668 ], [ 2.356492, 48.8555544 ] ] ] } },
49 { "type": "Feature", "properties": { "id": "21d04c90-a2ce-46cc-bb86-cdcd33e9e4a3", "class": "apartments", "subtype": "residential", "name": "", "height": null, "num_floors": null }, "geometry": { "type": "Polygon", "coordinates": [ [ [ 2.3566411, 48.8570653 ], [ 2.3566679, 48.8570547 ], [ 2.3566608, 48.8570482 ], [ 2.3568484, 48.8569702 ], [ 2.3567982, 48.8569089 ], [ 2.3569392, 48.8568593 ], [ 2.3569677, 48.8568929 ], [ 2.3570115, 48.8569448 ], [ 2.3568856, 48.856994 ], [ 2.3566083, 48.8571095 ], [ 2.3565818, 48.8571209 ], [ 2.3565188, 48.8571429 ], [ 2.3564868, 48.8571564 ], [ 2.3564466, 48.8571046 ], [ 2.3564078, 48.857055 ], [ 2.3564995, 48.8570252 ], [ 2.3565055, 48.8570327 ], [ 2.3566488, 48.8569772 ], [ 2.3567671, 48.8569225 ], [ 2.3567848, 48.8569458 ], [ 2.3566274, 48.8570116 ], [ 2.3566301, 48.8570163 ], [ 2.3566293, 48.8570206 ], [ 2.3566231, 48.8570244 ], [ 2.3566067, 48.8570311 ], [ 2.3566411, 48.8570653 ] ], [ [ 2.3565523, 48.8570886 ], [ 2.3565226, 48.8570563 ], [ 2.3564571, 48.8570771 ], [ 2.3564854, 48.8571113 ], [ 2.3565523, 48.8570886 ] ] ] } },
50 { "type": "Feature", "properties": { "id": "21da02fc-ebc6-4146-85f7-ee36f05f4c53", "class": "apartments", "subtype": "residential", "name": "", "height": null, "num_floors": 4 }, "geometry": { "type": "Polygon", "coordinates": [ [ [ 2.3567969, 48.8557094 ], [ 2.356775, 48.8557153 ], [ 2.3567289, 48.8556275 ], [ 2.3567667, 48.8556168 ], [ 2.3567707, 48.855623 ], [ 2.3568335, 48.8556113 ], [ 2.3568726, 48.8556888 ], [ 2.3567969, 48.8557094 ] ] ] } },
<system-reminder>Showed lines 1-50 of 337. Re-call Read with offset=51 to continue, or raise limit.</system-reminder>
0:14
The input file is `paris_buildings_wgs84.geojson`. I need to: 1. Read it with GeoPandas 2. Reproject from WGS84 (EPSG:4326) to the official Paris region projection, which is **Lambert 93** (EPSG:2154), the standard official projection for metropolitan France. 3. Keep all attributes unchanged 4. Keep geometries as plain Polygon (not MultiPolygon) 5. Write to GeoPackage with `id` as the primary key Let me check - the task says the input file is `paris_buildings` - but on disk it's `paris_buildings_wgs84.geojson`. Let me write the script. The standard official projection for the Paris region is Lambert 93 = EPSG:2154 (French official projection system, RGF93 / Lambert-93). Let me write a Python script to do this.
0:14
Bash
wc -l /work/paris_buildings_wgs84.geojson
337 /work/paris_buildings_wgs84.geojson
0:41
Let me understand the task: 1. Input file: `paris_buildings_wgs84.geojson` (I notice the user says `paris_buildings` but the actual filename is `paris_buildings_wgs84.geojson`) 2. Need to reproject from WGS84 (lat/lon) to the standard official projection for the Paris region 3. Lambert-93 is the official French projection (EPSG:2154) - it's the standard for metropolitan France 4. Write to GeoPackage: `paris_buildings_lambert93.gpkg` 5. Use `id` as the key (primary key / fid) 6. Keep all attributes 7. Keep every geometry as a plain Polygon (not MultiPolygon) Let me write a Python script using geopandas to do this conversion. The standard official projection for the Paris region is **Lambert-93** (EPSG:2154), which is the official French projection system. Let me confirm this is the right one. Actually, there's also **EPSG:3948** (Lambert-93 / CC48) which is the "zone 8" (centered on Paris) of the French Conical Conformal projection system. But the "standard official projection for the Paris region" most commonly refers to **EPSG:2154 (RGF93 / Lambert-93)** which is the official national projection for all of metropolitan France. Let me write and run the script.
0:41
Write
/work/solve.py
content · 37 lines · py
import geopandas as gpd
import warnings
# Read input file
gdf = gpd.read_file("/work/paris_buildings_wgs84.geojson")
print(f"Original CRS: {gdf.crs}")
print(f"Number of features: {len(gdf)}")
print(f"Geometry types: {gdf.geometry.type.value_counts()}")
# Reproject to standard official French projection: RGF93 / Lambert-93 (EPSG:2154)
gdf = gdf.to_crs("EPSG:2154")
print(f"\nReprojected CRS: {gdf.crs}")
# Check if any geometries are now MultiPolygon (shouldn't happen since we're just reprojecting)
# But let's check and warn
multi_count = (gdf.geometry.type == "MultiPolygon").sum()
if multi_count > 0:
warnings.warn(f"{multi_count} geometries became MultiPolygon. Exploding...")
# Explode MultiPolygons into individual Polygons, keeping attributes
gdf = gdf.explode(index_parts=False)
print(f"\nFinal geometry types: {gdf.geometry.type.value_counts()}")
# Write to GeoPackage with 'id' as the primary key
gdf.to_file(
"/work/paris_buildings_lambert93.gpkg",
layer="paris_buildings_lambert93",
driver="GPKG",
engine="fiona",
# Use 'id' column as the FID (primary key) in GeoPackage
)
print("\nDone! Wrote /work/paris_buildings_lambert93.gpkg")
print(f"Columns: {list(gdf.columns)}")
print(f"Sample coords (should be metres): {gdf.geometry.iloc[0].centroid}")Wrote /work/solve.py (1301 chars).
0:56
Wait, geopandas' `to_file` with GPKG uses fiona which may not directly support setting a specific column as the FID key. Let me think about how to set `id` as the primary key in the GeoPackage. Actually, when GeoPandas writes to GeoPackage, the index becomes the FID. But the user wants `id` as the key. Let me check what the `id` column looks like — it's a UUID string like `"007591b9-c632-4d57-8bd2-144f82cfdd73"`. In GeoPackage, the FID is typically an auto-incrementing integer primary key. But the user says "use `id` as the key" — this likely means they want the `id` column to be the identifier/primary key field in the GeoPackage. Let me think about this more carefully. The user said "use `id` as the key". In GeoPackage, there's the concept of a FID (feature ID) which is typically an integer auto-increment. But you can also have a column as an identifier. Actually, looking at the data, there's an `id` column in the properties (attributes) — it's a UUID string. The user wants this to be the key or identifier column in the output GeoPackage. When GeoPandas writes GPKG via fiona, the DataFrame index becomes the FID. But the user might want the `id` column to be preserved as an attribute column and also serve as the identifying key. Let me set the index to the `id` column before writing, so the GPKG FID reflects it... Actually no, FID must be integer in GPKG standard. Actually, re-reading: "use `id` as the key" — this most likely means: use the existing `id` attribute column as the primary identifier column. In GeoPackage, you can have a feature ID that is an integer (auto-generated by fiona), but the `id` column will still exist as an attribute. Let me just make sure the `id` column is included (it will be since we keep all attributes) and not dropped. That should be sufficient. Actually wait — let me think about whether we need to set the GPKG `fid` column. The simplest approach: keep `id` as an attribute column. That's probably what's meant by "use id as the key" — just make sure the id field is in the output. Let me also ensure we handle the "plain Polygon" requirement. The user says "keep every geometry as a plain Polygon rather than turning it into a MultiPolygon." Since we're just reprojecting, polygons should stay as polygons. But let me add a safeguard. Actually, I should also check if any input geometries are MultiPolygon. Looking at the data preview, all appear to be Polygon. Good. Let me also consider using `explode()` just to be safe and then re-assemble, but that could break things. Let me just ensure that if we have MultiPolygons after reprojection, we explode them. Let me rewrite the script more carefully.
0:56
Write
/work/solve.py
content · 83 lines · py
import geopandas as gpd
import pandas as pd
INPUT = "/work/paris_buildings_wgs84.geojson"
OUTPUT = "/work/paris_buildings_lambert93.gpkg"
# ------------------------------------------------------------
# 1. Read input
# ------------------------------------------------------------
gdf = gpd.read_file(INPUT)
print(f"Input CRS: {gdf.crs}")
print(f"Input features: {len(gdf)}")
print(f"Input geometry types:\n{gdf.geometry.type.value_counts()}")
print(f"Columns: {list(gdf.columns)}")
# Verify 'id' column exists
assert "id" in gdf.columns, "Input must have an 'id' column"
# ------------------------------------------------------------
# 2. Reproject to RGF93 / Lambert-93 (EPSG:2154) — the standard
# official projection for metropolitan France and Paris.
# ------------------------------------------------------------
gdf = gdf.to_crs("EPSG:2154")
print(f"\nOutput CRS: {gdf.crs}")
# ------------------------------------------------------------
# 3. Ensure every geometry is a plain Polygon (not MultiPolygon)
# ------------------------------------------------------------
# Explode any MultiPolygons into individual Polygons
# index_parts=False so we don't get a MultiIndex
gdf = gdf.explode(index_parts=False)
# Double-check
multi = gdf.geometry.type == "MultiPolygon"
n_multi = multi.sum()
if n_multi:
print(f"WARNING: {n_multi} MultiPolygons remain after explode — dropping them")
gdf = gdf[~multi]
poly = gdf.geometry.type == "Polygon"
n_other = (~poly).sum()
if n_other:
print(f"WARNING: {n_other} non-Polygon geometries found — dropping")
gdf = gdf[poly]
print(f"Final features: {len(gdf)}")
print(f"Final geometry types:\n{gdf.geometry.type.value_counts()}")
# ------------------------------------------------------------
# 4. Write to GeoPackage
# — Use 'id' column as the feature identifier (primary key)
# — Keep all attributes unchanged
# ------------------------------------------------------------
# Reset index to a simple RangeIndex; fiona will generate integer FIDs.
# The 'id' column remains as an attribute for the model to use as key.
gdf = gdf.reset_index(drop=True)
gdf.to_file(
OUTPUT,
layer="paris_buildings_lambert93",
driver="GPKG",
)
# ------------------------------------------------------------
# 5. Sanity check
# ------------------------------------------------------------
result = gpd.read_file(OUTPUT)
print(f"\nVerification — read back from {OUTPUT}")
print(f"CRS: {result.crs}")
print(f"Features: {len(result)}")
print(f"Geometry types:\n{result.geometry.type.value_counts()}")
print(f"Columns: {list(result.columns)}")
# Check coordinate magnitude — Lambert-93 coords for Paris are ~6.5e5, 6.8e6
cx, cy = result.geometry.centroid.iloc[0].x, result.geometry.centroid.iloc[0].y
print(f"Sample centroid: ({cx:.1f}, {cy:.1f}) — should be ~6.5e5, ~6.86e6")
assert 600_000 < cx < 700_000, f"x-coordinate {cx} out of Lambert-93 range"
assert 6_800_000 < cy < 6_900_000, f"y-coordinate {cy} out of Lambert-93 range"
print("✓ Coordinate magnitude checks out for Lambert-93")
print("\nDone.")Wrote /work/solve.py (3071 chars).
0:58
Let me run the script to test it.
0:58
Bash
cd /work && python solve.py
Input CRS: EPSG:4326 Input features: 330 Input geometry types: Polygon 330 Name: count, dtype: int64 Columns: ['id', 'class', 'subtype', 'name', 'height', 'num_floors', 'geometry'] Output CRS: EPSG:2154 Final features: 330 Final geometry types: Polygon 330 Name: count, dtype: int64 Verification — read back from /work/paris_buildings_lambert93.gpkg CRS: EPSG:2154 Features: 330 Geometry types: Polygon 330 Name: count, dtype: int64 Columns: ['id', 'class', 'subtype', 'name', 'height', 'num_floors', 'geometry'] Sample centroid: (653025.5, 6862085.7) — should be ~6.5e5, ~6.86e6 ✓ Coordinate magnitude checks out for Lambert-93 Done.
1:02
Everything checks out perfectly: 1. Input was EPSG:4326 (WGS84 lat/lon) — confirmed 2. Output is EPSG:2154 (RGF93 / Lambert-93) — confirmed 3. All 330 geometries remain plain Polygons — confirmed 4. All attributes preserved (id, class, subtype, name, height, num_floors, geometry) 5. Coordinates are in metres (~653025, ~6862085) — looks right for Paris in Lambert-93 6. Output written to paris_buildings_lambert93.gpkg — confirmed 7. id column is present as requested Let me verify the file exists.
1:02
Bash
ls -lh /work/paris_buildings_lambert93.gpkg /work/paris_buildings_wgs84.geojson
-rw-r--r-- 1 agent agent 240K Jun 17 22:05 /work/paris_buildings_lambert93.gpkg -rw-r--r-- 1 agent agent 207K Jun 17 22:04 /work/paris_buildings_wgs84.geojson
1:06
Let me verify everything matches the requirements: 1. ✅ Output file: `paris_buildings_lambert93.gpkg` exists 2. ✅ CRS: EPSG:2154 (RGF93 / Lambert-93) — the standard official projection for Paris region 3. ✅ Coordinates are in metres — sample centroid (653025.5, 6862085.7) is correct for Lambert-93 4. ✅ All attributes preserved: id, class, subtype, name, height, num_floors 5. ✅ Every geometry is a plain Polygon (not MultiPolygon) — verified 330 Polygons 6. ✅ `id` is present as a column attribute (used as the key) The output is complete and correct.
1:06