import geopandas as gpd
import rasterio as rioDémonstration de l’écosystème géospatial de Python
Import des bibliothèques
Ouverture d’un premier jeu de données avec GeoPandas :
communes = gpd.read_file('../data/COMMUNE.shp')
communes.head()| ID | INSEE_COM | INSEE_ARR | INSEE_COL | INSEE_DEP | INSEE_REG | POPULATION | SURFACE_HA | DATE_CREAT | DATE_MAJ | ... | CL_DEPART | CL_REGION | CAPITALE | DATE_RCT | RECENSEUR | SIREN_EPCI | ID_CH_LIEU | ID_AUT_ADM | CODE_SIREN | geometry | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 0 | COMMUNE_0000000009754200 | 38359 | 1 | 38D | 38 | 84 | 1197 | 3622 | 2006-08-02 08:36:54 | 2023-01-20 10:57:47 | ... | Non | Non | Non | 2020-01-01 | INSEE | 200070431 | PAIHABIT0000000007545622 | SURFACTI0000000007463791 | 200054526 | POLYGON ((872007.300 6454019.300, 872006.300 6... |
| 1 | COMMUNE_0000000009755669 | 38243 | 1 | 38D | 38 | 84 | 247 | 1499 | 2006-08-02 08:36:54 | 2023-02-14 10:36:40 | ... | Non | Non | Non | 2020-01-01 | INSEE | 200030658 | PAIHABIT0000000007548437 | SURFACTI0000000042499727 | 213802432 | POLYGON ((907510.800 6409545.700, 907506.100 6... |
| 2 | COMMUNE_0000000009753737 | 38239 | 1 | 38D | 38 | 84 | 7495 | 2006 | 2006-08-02 08:36:54 | 2023-01-18 18:39:43 | ... | Non | Non | Non | 2020-01-01 | INSEE | 243800984 | PAIHABIT0000000007542619 | SURFACTI0000000007463524 | 213802390 | POLYGON ((900804.200 6475473.300, 900816.800 6... |
| 3 | COMMUNE_0000000009755432 | 05064 | 2 | 05D | 05 | 93 | 105 | 10802 | 2006-08-02 08:36:54 | 2023-01-18 18:39:43 | ... | Non | Non | Non | 2020-01-01 | INSEE | 200068096 | PAIHABIT0000000075658095 | SURFACTI0000000118484062 | 210500641 | POLYGON ((950358.400 6422049.800, 950358.000 6... |
| 4 | COMMUNE_0000000009754591 | 38237 | 1 | 38D | 38 | 84 | 190 | 1460 | 2006-08-02 08:36:54 | 2023-01-18 18:39:43 | ... | Non | Non | Non | 2020-01-01 | INSEE | 243800745 | PAIHABIT0000000007546970 | SURFACTI0000000007463883 | 213802374 | POLYGON ((946870.000 6443476.500, 946851.600 6... |
5 rows × 26 columns
communes.crs<Projected CRS: EPSG:2154>
Name: RGF93 v1 / Lambert-93
Axis Info [cartesian]:
- X[east]: Easting (metre)
- Y[north]: Northing (metre)
Area of Use:
- name: France - onshore and offshore, mainland and Corsica (France métropolitaine including Corsica).
- bounds: (-9.86, 41.15, 10.38, 51.56)
Coordinate Operation:
- name: Lambert-93
- method: Lambert Conic Conformal (2SP)
Datum: Reseau Geodesique Francais 1993 v1
- Ellipsoid: GRS 1980
- Prime Meridian: Greenwich
communes.plot(edgecolor='black', color="pink")<Axes: >

arrondissements = communes.dissolve(by='INSEE_ARR')
arrondissements.plot(edgecolor='red')<Axes: >

centroids = communes.centroid
centroids.plot()<Axes: >

communes.boundary.plot()<Axes: >

cours_deau = gpd.read_file('../data/COURS_D_EAU.shp')
cours_deau.head()| ID | CODE_HYDRO | TOPONYME | STATUT_TOP | IMPORTANCE | DATE_CREAT | DATE_MAJ | DATE_APP | DATE_CONF | SOURCE | ID_SOURCE | STATUT | MAREE | PERMANENT | COMMENT | geometry | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 0 | COURDEAU0000002215479238 | 06C0000002215479238 | Canal de Pulivès | Validé | 5 | 2020-10-21 09:35:44 | 2020-11-12 10:46:00 | None | None | None | None | Validé | None | None | None | LINESTRING (847280.500 6505594.500, 847273.400... |
| 1 | COURDEAU0000002000792297 | 06C0000002000792297 | Torrent du Clot des Cavales | Validé | 5 | 2017-01-24 16:06:18 | 2022-06-03 22:58:45 | None | None | None | None | Validé | None | None | None | LINESTRING (963060.600 6437049.700, 963068.600... |
| 2 | COURDEAU0000002215478774 | 06C0000002215478774 | le Bouveyron | Validé | 5 | 2020-10-21 09:35:44 | 2020-11-12 10:46:00 | None | None | None | None | Validé | None | None | None | LINESTRING (895311.900 6452665.700, 895271.300... |
| 3 | COURDEAU0000002000803076 | 06C0000002000803076 | Ruisseau de la Combe de Mouze | Validé | 5 | 2017-01-24 16:06:18 | 2020-09-28 10:34:31 | None | None | None | None | Validé | None | None | None | LINESTRING (878398.000 6459581.500, 878400.900... |
| 4 | COURDEAU0000002215480545 | 06C0000002215480545 | le Pachoux | Validé | 5 | 2020-10-21 09:35:44 | 2020-11-12 10:46:00 | None | None | None | None | Validé | None | None | None | LINESTRING (945273.400 6484691.600, 945299.600... |
cours_deau.plot()<Axes: >

cours_deau_intersectés = cours_deau.intersection(communes.dissolve().iloc[0].geometry)
cours_deau_intersectés.plot()<Axes: >

import contextily as cx
# Les communes, en Web Mercator
ax = communes.to_crs('EPSG:3857').plot(edgecolor='grey', color="lightgrey")
# Les cours d'eau, intersectés avec les communes, en Web mercator
ax = cours_deau_intersectés.to_crs('EPSG:3857').plot(ax = ax, color="blue")
# Ajout du fond de carte
cx.add_basemap(ax, source='https://tile.openstreetmap.org/{z}/{x}/{y}.png')
# On enlève les axes du graphique
ax.set_axis_off()
ax<Axes: >

cours_deau.crs<Projected CRS: EPSG:2154>
Name: RGF93 v1 / Lambert-93
Axis Info [cartesian]:
- X[east]: Easting (metre)
- Y[north]: Northing (metre)
Area of Use:
- name: France - onshore and offshore, mainland and Corsica (France métropolitaine including Corsica).
- bounds: (-9.86, 41.15, 10.38, 51.56)
Coordinate Operation:
- name: Lambert-93
- method: Lambert Conic Conformal (2SP)
Datum: Reseau Geodesique Francais 1993 v1
- Ellipsoid: GRS 1980
- Prime Meridian: Greenwich
cours_deau[['TOPONYME', 'IMPORTANCE']].head()| TOPONYME | IMPORTANCE | |
|---|---|---|
| 0 | Canal de Pulivès | 5 |
| 1 | Torrent du Clot des Cavales | 5 |
| 2 | le Bouveyron | 5 |
| 3 | Ruisseau de la Combe de Mouze | 5 |
| 4 | le Pachoux | 5 |
Sélection de l’entité correspondant au canal du furon et de sa géométrie
cours_deau[cours_deau.TOPONYME == 'Canal du Furon']| ID | CODE_HYDRO | TOPONYME | STATUT_TOP | IMPORTANCE | DATE_CREAT | DATE_MAJ | DATE_APP | DATE_CONF | SOURCE | ID_SOURCE | STATUT | MAREE | PERMANENT | COMMENT | geometry | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1236 | COURDEAU0000002000796489 | 06C0000002000796489 | Canal du Furon | Validé | 5 | 2017-01-24 16:06:18 | 2021-09-16 13:50:18 | None | None | None | None | Validé | None | None | None | LINESTRING (904717.400 6447571.200, 904712.000... |
geom = cours_deau.loc[(cours_deau[cours_deau.TOPONYME == 'Canal du Furon'].index[0], 'geometry')]
geommnt = rio.open('../data/DEM_N245E395_l93.tif')
print(mnt.meta){'driver': 'GTiff', 'dtype': 'float32', 'nodata': 3.4028234663852886e+38, 'width': 2393, 'height': 2000, 'count': 1, 'crs': CRS.from_epsg(2154), 'transform': Affine(22.625939867401588, 0.0, 876147.6561479433,
0.0, -27.206653628468978, 6496734.7862259)}
from rasterio.plot import showshow(mnt)
<Axes: >
ax = cours_deau_intersectés.plot(edgecolor="red")
ax = show(mnt, ax=ax)
ax<Axes: >

# geom est la géométrie récupérée plus tôt
length = geom.length
# combien de points :
nb_points = 50
# quelle distance entre les points :
step = length / (nb_points - 1)
dists = []
coords = []
for dist in range(0, int(length), int(step)):
pt = geom.interpolate(dist) # type(pt) -> shapely.geometry.Point
# récupération des coordonnées du points sous forme d'un tuple :
c = pt.coords[0]
coords.append(c)
dists.append(dist)
result = []
for i, value in enumerate(mnt.sample(coords)):
result.append((dists[i], value[0]))import matplotlib.pyplot as plt
plt.plot([i[0] for i in result], [i[1] for i in result])
plt.title('Profil en long du Canal du Furon')
plt.xlabel('Distance à la source')
plt.ylabel('Altitude')
plt.show()
result = []
for dist in range(0, int(length), int(step)):
pt = geom.interpolate(dist)
result.append({
"geometry": pt,
"distance_source": dist,
"altitude": list(mnt.sample(pt.coords))[0][0],
})
# Cette fois nous avons utilisé une liste
# contenant un dictionnaire pour chaque entité
# ... le résultat est le même qu'avec la méthode prédécente
sample_pts = gpd.GeoDataFrame(result, crs=cours_deau.crs)
# Toutes nos nouvelles entités vont prendre cette valeur
sample_pts['TOPONYME_COURS_DEAU'] = 'Canal du Furon'
sample_pts.head()| geometry | distance_source | altitude | TOPONYME_COURS_DEAU | |
|---|---|---|---|---|
| 0 | POINT (904717.400 6447571.200) | 0 | 1425.737671 | Canal du Furon |
| 1 | POINT (904696.944 6447996.849) | 428 | 1362.941040 | Canal du Furon |
| 2 | POINT (904755.972 6448415.457) | 856 | 1316.247681 | Canal du Furon |
| 3 | POINT (904703.201 6448834.857) | 1284 | 1288.363037 | Canal du Furon |
| 4 | POINT (904552.212 6449229.865) | 1712 | 1219.130859 | Canal du Furon |
sample_pts.to_crs('EPSG:4326').to_file('/tmp/sample-pts.geojson')%cat /tmp/sample-pts.geojson{
"type": "FeatureCollection",
"crs": { "type": "name", "properties": { "name": "urn:ogc:def:crs:OGC:1.3:CRS84" } },
"features": [
{ "type": "Feature", "properties": { "distance_source": 0, "altitude": 1425.7376708984375, "TOPONYME_COURS_DEAU": "Canal du Furon" }, "geometry": { "type": "Point", "coordinates": [ 5.602936388562155, 45.097041248809752 ] } },
{ "type": "Feature", "properties": { "distance_source": 428, "altitude": 1362.9410400390625, "TOPONYME_COURS_DEAU": "Canal du Furon" }, "geometry": { "type": "Point", "coordinates": [ 5.602854817807447, 45.100877769687386 ] } },
{ "type": "Feature", "properties": { "distance_source": 856, "altitude": 1316.2476806640625, "TOPONYME_COURS_DEAU": "Canal du Furon" }, "geometry": { "type": "Point", "coordinates": [ 5.603780310543639, 45.104627343059583 ] } },
{ "type": "Feature", "properties": { "distance_source": 1284, "altitude": 1288.363037109375, "TOPONYME_COURS_DEAU": "Canal du Furon" }, "geometry": { "type": "Point", "coordinates": [ 5.603285507285375, 45.108417233222767 ] } },
{ "type": "Feature", "properties": { "distance_source": 1712, "altitude": 1219.130859375, "TOPONYME_COURS_DEAU": "Canal du Furon" }, "geometry": { "type": "Point", "coordinates": [ 5.601532157195259, 45.112016753315935 ] } },
{ "type": "Feature", "properties": { "distance_source": 2140, "altitude": 1170.004638671875, "TOPONYME_COURS_DEAU": "Canal du Furon" }, "geometry": { "type": "Point", "coordinates": [ 5.601070658466196, 45.115813452064629 ] } },
{ "type": "Feature", "properties": { "distance_source": 2568, "altitude": 1128.1978759765625, "TOPONYME_COURS_DEAU": "Canal du Furon" }, "geometry": { "type": "Point", "coordinates": [ 5.602875015792643, 45.119419528471369 ] } },
{ "type": "Feature", "properties": { "distance_source": 2996, "altitude": 1114.665771484375, "TOPONYME_COURS_DEAU": "Canal du Furon" }, "geometry": { "type": "Point", "coordinates": [ 5.603318600708222, 45.122799392830174 ] } },
{ "type": "Feature", "properties": { "distance_source": 3424, "altitude": 1064.7662353515625, "TOPONYME_COURS_DEAU": "Canal du Furon" }, "geometry": { "type": "Point", "coordinates": [ 5.600993324093485, 45.125765092317096 ] } },
{ "type": "Feature", "properties": { "distance_source": 3852, "altitude": 1028.2977294921875, "TOPONYME_COURS_DEAU": "Canal du Furon" }, "geometry": { "type": "Point", "coordinates": [ 5.596714861215382, 45.127787527323783 ] } },
{ "type": "Feature", "properties": { "distance_source": 4280, "altitude": 1009.6756591796875, "TOPONYME_COURS_DEAU": "Canal du Furon" }, "geometry": { "type": "Point", "coordinates": [ 5.592514319284059, 45.129088181552319 ] } },
{ "type": "Feature", "properties": { "distance_source": 4708, "altitude": 982.3232421875, "TOPONYME_COURS_DEAU": "Canal du Furon" }, "geometry": { "type": "Point", "coordinates": [ 5.588682946240333, 45.131060046928404 ] } },
{ "type": "Feature", "properties": { "distance_source": 5136, "altitude": 970.5863037109375, "TOPONYME_COURS_DEAU": "Canal du Furon" }, "geometry": { "type": "Point", "coordinates": [ 5.587298981190339, 45.134015004202809 ] } },
{ "type": "Feature", "properties": { "distance_source": 5564, "altitude": 966.78436279296875, "TOPONYME_COURS_DEAU": "Canal du Furon" }, "geometry": { "type": "Point", "coordinates": [ 5.587601804540014, 45.137549358350455 ] } },
{ "type": "Feature", "properties": { "distance_source": 5992, "altitude": 961.939453125, "TOPONYME_COURS_DEAU": "Canal du Furon" }, "geometry": { "type": "Point", "coordinates": [ 5.589307549857743, 45.140425187838744 ] } },
{ "type": "Feature", "properties": { "distance_source": 6420, "altitude": 969.871826171875, "TOPONYME_COURS_DEAU": "Canal du Furon" }, "geometry": { "type": "Point", "coordinates": [ 5.592913627728214, 45.141984603742451 ] } },
{ "type": "Feature", "properties": { "distance_source": 6848, "altitude": 976.577880859375, "TOPONYME_COURS_DEAU": "Canal du Furon" }, "geometry": { "type": "Point", "coordinates": [ 5.597445920273993, 45.143742685679122 ] } },
{ "type": "Feature", "properties": { "distance_source": 7276, "altitude": 982.93341064453125, "TOPONYME_COURS_DEAU": "Canal du Furon" }, "geometry": { "type": "Point", "coordinates": [ 5.599646103684857, 45.146560456559669 ] } },
{ "type": "Feature", "properties": { "distance_source": 7704, "altitude": 966.16180419921875, "TOPONYME_COURS_DEAU": "Canal du Furon" }, "geometry": { "type": "Point", "coordinates": [ 5.600427204302822, 45.149846695838583 ] } },
{ "type": "Feature", "properties": { "distance_source": 8132, "altitude": 945.78857421875, "TOPONYME_COURS_DEAU": "Canal du Furon" }, "geometry": { "type": "Point", "coordinates": [ 5.603545080638023, 45.152644680689725 ] } },
{ "type": "Feature", "properties": { "distance_source": 8560, "altitude": 900.91259765625, "TOPONYME_COURS_DEAU": "Canal du Furon" }, "geometry": { "type": "Point", "coordinates": [ 5.606450670072398, 45.155564354564163 ] } },
{ "type": "Feature", "properties": { "distance_source": 8988, "altitude": 887.65020751953125, "TOPONYME_COURS_DEAU": "Canal du Furon" }, "geometry": { "type": "Point", "coordinates": [ 5.608563605707576, 45.158904918695256 ] } },
{ "type": "Feature", "properties": { "distance_source": 9416, "altitude": 902.82696533203125, "TOPONYME_COURS_DEAU": "Canal du Furon" }, "geometry": { "type": "Point", "coordinates": [ 5.609622889418532, 45.162068349970951 ] } },
{ "type": "Feature", "properties": { "distance_source": 9844, "altitude": 887.63275146484375, "TOPONYME_COURS_DEAU": "Canal du Furon" }, "geometry": { "type": "Point", "coordinates": [ 5.611497801481677, 45.165479333457625 ] } },
{ "type": "Feature", "properties": { "distance_source": 10272, "altitude": 878.794921875, "TOPONYME_COURS_DEAU": "Canal du Furon" }, "geometry": { "type": "Point", "coordinates": [ 5.613113398049233, 45.168887338191517 ] } },
{ "type": "Feature", "properties": { "distance_source": 10700, "altitude": 872.40411376953125, "TOPONYME_COURS_DEAU": "Canal du Furon" }, "geometry": { "type": "Point", "coordinates": [ 5.614930460774134, 45.172344289585418 ] } },
{ "type": "Feature", "properties": { "distance_source": 11128, "altitude": 869.51171875, "TOPONYME_COURS_DEAU": "Canal du Furon" }, "geometry": { "type": "Point", "coordinates": [ 5.618104946640242, 45.174794174570977 ] } },
{ "type": "Feature", "properties": { "distance_source": 11556, "altitude": 845.72125244140625, "TOPONYME_COURS_DEAU": "Canal du Furon" }, "geometry": { "type": "Point", "coordinates": [ 5.619612546351767, 45.177923171302027 ] } },
{ "type": "Feature", "properties": { "distance_source": 11984, "altitude": 841.0703125, "TOPONYME_COURS_DEAU": "Canal du Furon" }, "geometry": { "type": "Point", "coordinates": [ 5.620752381457533, 45.181470353452397 ] } },
{ "type": "Feature", "properties": { "distance_source": 12412, "altitude": 831.24798583984375, "TOPONYME_COURS_DEAU": "Canal du Furon" }, "geometry": { "type": "Point", "coordinates": [ 5.622133643324828, 45.184373138538213 ] } },
{ "type": "Feature", "properties": { "distance_source": 12840, "altitude": 779.9158935546875, "TOPONYME_COURS_DEAU": "Canal du Furon" }, "geometry": { "type": "Point", "coordinates": [ 5.624211779277705, 45.187667608008951 ] } },
{ "type": "Feature", "properties": { "distance_source": 13268, "altitude": 730.93505859375, "TOPONYME_COURS_DEAU": "Canal du Furon" }, "geometry": { "type": "Point", "coordinates": [ 5.62779484719948, 45.190185339903387 ] } },
{ "type": "Feature", "properties": { "distance_source": 13696, "altitude": 695.1026611328125, "TOPONYME_COURS_DEAU": "Canal du Furon" }, "geometry": { "type": "Point", "coordinates": [ 5.6277852170336, 45.193998450489666 ] } },
{ "type": "Feature", "properties": { "distance_source": 14124, "altitude": 661.1397705078125, "TOPONYME_COURS_DEAU": "Canal du Furon" }, "geometry": { "type": "Point", "coordinates": [ 5.629914860357067, 45.197418964335661 ] } },
{ "type": "Feature", "properties": { "distance_source": 14552, "altitude": 574.65057373046875, "TOPONYME_COURS_DEAU": "Canal du Furon" }, "geometry": { "type": "Point", "coordinates": [ 5.633707541744952, 45.199807975440336 ] } },
{ "type": "Feature", "properties": { "distance_source": 14980, "altitude": 554.5118408203125, "TOPONYME_COURS_DEAU": "Canal du Furon" }, "geometry": { "type": "Point", "coordinates": [ 5.636334960225095, 45.202530705404811 ] } },
{ "type": "Feature", "properties": { "distance_source": 15408, "altitude": 537.9266357421875, "TOPONYME_COURS_DEAU": "Canal du Furon" }, "geometry": { "type": "Point", "coordinates": [ 5.639964335327242, 45.20477696452906 ] } },
{ "type": "Feature", "properties": { "distance_source": 15836, "altitude": 488.54095458984375, "TOPONYME_COURS_DEAU": "Canal du Furon" }, "geometry": { "type": "Point", "coordinates": [ 5.642399549382896, 45.207890545428768 ] } },
{ "type": "Feature", "properties": { "distance_source": 16264, "altitude": 387.07159423828125, "TOPONYME_COURS_DEAU": "Canal du Furon" }, "geometry": { "type": "Point", "coordinates": [ 5.646623860523144, 45.209265173965186 ] } },
{ "type": "Feature", "properties": { "distance_source": 16692, "altitude": 317.86752319335938, "TOPONYME_COURS_DEAU": "Canal du Furon" }, "geometry": { "type": "Point", "coordinates": [ 5.651810844049399, 45.208978670733813 ] } },
{ "type": "Feature", "properties": { "distance_source": 17120, "altitude": 216.86354064941406, "TOPONYME_COURS_DEAU": "Canal du Furon" }, "geometry": { "type": "Point", "coordinates": [ 5.657052766355505, 45.208349663445603 ] } },
{ "type": "Feature", "properties": { "distance_source": 17548, "altitude": 208.27235412597656, "TOPONYME_COURS_DEAU": "Canal du Furon" }, "geometry": { "type": "Point", "coordinates": [ 5.661201118701395, 45.209238149946053 ] } },
{ "type": "Feature", "properties": { "distance_source": 17976, "altitude": 205.74320983886719, "TOPONYME_COURS_DEAU": "Canal du Furon" }, "geometry": { "type": "Point", "coordinates": [ 5.663603071168562, 45.212182069309662 ] } },
{ "type": "Feature", "properties": { "distance_source": 18404, "altitude": 207.64234924316406, "TOPONYME_COURS_DEAU": "Canal du Furon" }, "geometry": { "type": "Point", "coordinates": [ 5.666696966832268, 45.214685949193147 ] } },
{ "type": "Feature", "properties": { "distance_source": 18832, "altitude": 202.63288879394531, "TOPONYME_COURS_DEAU": "Canal du Furon" }, "geometry": { "type": "Point", "coordinates": [ 5.665296781211094, 45.218376791831325 ] } },
{ "type": "Feature", "properties": { "distance_source": 19260, "altitude": 203.68572998046875, "TOPONYME_COURS_DEAU": "Canal du Furon" }, "geometry": { "type": "Point", "coordinates": [ 5.666779168351665, 45.221590543317554 ] } },
{ "type": "Feature", "properties": { "distance_source": 19688, "altitude": 202.07421875, "TOPONYME_COURS_DEAU": "Canal du Furon" }, "geometry": { "type": "Point", "coordinates": [ 5.664208221363736, 45.224988806681253 ] } },
{ "type": "Feature", "properties": { "distance_source": 20116, "altitude": 200.82586669921875, "TOPONYME_COURS_DEAU": "Canal du Furon" }, "geometry": { "type": "Point", "coordinates": [ 5.661614069298556, 45.228378651112351 ] } },
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