Gestion de données MNT
Modifié le
Téléversement d’images à canal flottant, calcul de pyramides, diffusion en WMS et utilisation dans le service d’altimétrie
Publication sur le service d’altimétrie
La pyramide générée va être également utilisable par le service d’altimétrie. Ce dernier permet de récupérer les altitudes en un point, ainsi que demander un profil altimétrique. Nous allons ici utiliser la donnée MNT ainsi que le MNS.
Configuration de la diffusion #
https://data.geopf.fr/api/datastores/{datastore}/configurations{
"type": "ALTIMETRY",
"name": "LidarHD : MNT et MNS",
"layer_name": "lidarhd_test",
"type_infos": {
"title": "LidarHD : MNT et MNS",
"abstract": "LidarHD : MNT et MNS, à 50 cm",
"keywords": ["LidarHD", "MNT", "MNS"],
"used_data": [
{
"title": "MNT à 50 cm, issu du Lidar HD",
"stored_data": "{stored data MNT}",
"source": {
"value": "Lidar HD"
},
"accuracy": {
"value": "Moins de 1 m"
}
},
{
"title": "MNS à 50 cm, issu du Lidar HD",
"stored_data": "{stored data MNS}",
"source": {
"value": "Lidar HD"
},
"accuracy": {
"value": "Moins de 1 m"
}
}
]
}
}Les informations pour la source et la précision de la donnée peuvent être définies de manière statique, comme ici, ou bien s’appuyer sur des pyramides raster (1 canal entier). On précisera alors la correspondance entre la valeur entière du pixel et l’intitulé de l’information.
Envoi sur les services de diffusion #
Consultation des points de diffusion disponibles #
Ce sont les points d’accès de type ALTIMETRY qui nous intéressent ici.
https://data.geopf.fr/api/datastores/{datastore}[
{
"name": "Service de diffusion WFS principal",
"technical_name": "gpf-geoserver-wfs",
"type": "WFS",
"urls": [
{
"type": "WFS",
"url": "https://data.geopf.fr/wfs/geoserver/ows"
}
],
"_id": "ae012611-13eb-4a18-8d04-9b7604a031cc",
"open": true,
"metadata_fi": "gpf-geoserver-wfs"
},
{
"name": "Service de diffusion WMTS/TMS principal",
"technical_name": "gpf-rok4-server-wmts-tms",
"type": "WMTS-TMS",
"urls": [
{
"type": "WMTS",
"url": "https://data.geopf.fr/wmts"
},
{
"type": "TMS",
"url": "https://data.geopf.fr/tms/"
}
],
"_id": "ae032611-13eb-4a18-8d04-9b7604a031cc",
"open": true,
"metadata_fi": "gpf-rok4-server-wmts-tms"
},
{
"name": "Service de diffusion WMS Raster principal",
"technical_name": "gpf-rok4-server-wms-r",
"type": "WMS-RASTER",
"urls": [
{
"type": "WMS",
"url": "https://data.geopf.fr/wms-r/wms"
}
],
"_id": "ae042611-13eb-4a18-8d04-9b7604a031cc",
"open": true,
"metadata_fi": "gpf-rok4-server-wms-r"
},
{
"name": "Service de diffusion WMS Vecteur principal",
"technical_name": "gpf-geoserver-wms-v",
"type": "WMS-VECTOR",
"urls": [
{
"type": "WMS",
"url": "https://data.geopf.fr/wms-v/geoserver/ows"
}
],
"_id": "ae022611-13eb-4a18-8d04-9b7604a031cc",
"open": true,
"metadata_fi": "gpf-geoserver-wms-v"
},
{
"name": "Service de Téléchargement principal",
"technical_name": "gpf-download",
"type": "DOWNLOAD",
"urls": [
{
"type": "DOWNLOAD",
"url": "https://data.geopf.fr/telechargement/"
}
],
"_id": "ae052611-13eb-4a18-8d04-9b7604a031cc",
"open": true,
"metadata_fi": "gpf-download"
},
{
"name": "Service de diffusion CSW",
"technical_name": "gpf-geonetwork",
"type": "METADATA",
"urls": [
{
"type": "METADATA",
"url": "https://data.geopf.fr/csw"
}
],
"_id": "ae062611-13eb-4a18-8d04-9b7604a031cc",
"open": true,
"metadata_fi": "gpf-geonetwork"
},
{
"name": "Service de téléchargement private",
"technical_name": "gpf-download-private",
"type": "DOWNLOAD",
"urls": [
{
"type": "DOWNLOAD",
"url": "https://data.geopf.fr/private/telechargement/"
}
],
"_id": "b5bf7ab2-8998-4829-8c80-cd2ec02e6e58",
"open": false,
"metadata_fi": "gpf-download-private"
},
{
"name": "Service de diffusion WFS privé",
"technical_name": "gpf-geoserver-wfs-private",
"type": "WFS",
"urls": [
{
"type": "WFS",
"url": "https://data.geopf.fr/private/wfs/"
}
],
"_id": "d02feec9-1169-403f-bfc3-7ba6d6015ed4",
"open": false,
"metadata_fi": "gpf-geoserver-wfs-private"
},
{
"name": "Service de diffusion WMS Vecteur privé",
"technical_name": "gpf-geoserver-wms-v-private",
"type": "WMS-VECTOR",
"urls": [
{
"type": "WMS",
"url": "https://data.geopf.fr/private/wms-v/"
}
],
"_id": "519c8bb1-9b7f-414a-9850-1a73dfd467ed",
"open": false,
"metadata_fi": "gpf-geoserver-wms-v-private"
},
{
"name": "Service de diffusion WMS Raster privé",
"technical_name": "gpf-rok4-server-wms-r-private",
"type": "WMS-RASTER",
"urls": [
{
"type": "WMS",
"url": "https://data.geopf.fr/private/wms-r/"
}
],
"_id": "66866100-48eb-4340-bbc9-f5c7d9707928",
"open": false,
"metadata_fi": "gpf-rok4-server-wms-r-private"
},
{
"name": "Service de diffusion WMTS/TMS privé",
"technical_name": "gpf-rok4-server-wmts-tms-private",
"type": "WMTS-TMS",
"urls": [
{
"type": "TMS",
"url": "https://data.geopf.fr/private/tms/"
},
{
"type": "WMTS",
"url": "https://data.geopf.fr/private/wmts/"
}
],
"_id": "7e0a92d1-8213-4ce0-8903-eb4c305a1849",
"open": false,
"metadata_fi": "gpf-rok4-server-wmts-tms-private"
}
]
Publication #
https://data.geopf.fr/api/datastores/{datastore}/configurations/{configuration altimétrie}/offerings{
"endpoint": "0ac92a1e-aa86-4843-8528-e303f12296e5",
"open": true
}On peut vérifier la présence de notre couche lidarhd_test dans le GetCapabilities du service. Voici un exemple de demande d’altitude en deux points :
https://data.geopf.fr/altimetrie/calcul/alti/rest/elevation.json| Paramètres de requête |
|---|
| resource = lidarhd_test |
| lon = 5.96|5.961 |
| lat = 45.13|45.131 |
| measures = true |
{
"elevations": [
{
"lon": 5.96,
"lat": 45.13,
"z": 1995.53,
"acc": "Moins de 1 m",
"measures": [
{
"z": 1995.53,
"source_name": "Lidar HD",
"source_measure": "Fixed value",
"acc": "Moins de 1 m",
"title": "MNS \u00e0 50 cm, issu du Lidar HD"
},
{
"z": 1989.14,
"source_name": "Lidar HD",
"source_measure": "Fixed value",
"acc": "Moins de 1 m",
"title": "MNT \u00e0 50 cm, issu du Lidar HD"
}
]
},
{
"lon": 5.961,
"lat": 45.131,
"z": 2098.24,
"acc": "Moins de 1 m",
"measures": [
{
"z": 2098.24,
"source_name": "Lidar HD",
"source_measure": "Fixed value",
"acc": "Moins de 1 m",
"title": "MNT \u00e0 50 cm, issu du Lidar HD"
},
{
"z": 2098.24,
"source_name": "Lidar HD",
"source_measure": "Fixed value",
"acc": "Moins de 1 m",
"title": "MNS \u00e0 50 cm, issu du Lidar HD"
}
]
}
]
}