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Altimetric Reference NetworkCanevas altimétrique

Canevas altimétriqueAltimetric Reference Network

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This dataset from the Strasbourg open-data portal describes the altimetric reference network used for geodetic positioning. Reference systems, whether national (RGF93, IGN69, IGN78) or international (ITRS, ETRS89), are accessed through the coordinates of physically installed benchmarks. In France, this national geodetic network is managed by the IGN (French national mapping agency). The dataset lists the benchmarks located within the Strasbourg area, providing their coordinates and elevation references, and is intended to support surveying, mapping, and construction projects requiring precise altitude and positioning data.Les réseaux constituent les réalisations des systèmes de référence géodésiques. L’accès aux références nationales (RGF93, IGN69, IGN78…) ou internationales (ITRS, ETRS89…) se fait entre autres au moyen des coordonnées de repères matérialisés. En France, le réseau national est géré par l'IGN (geod...

geospatial

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Data schema (22 fields)

Filterable via the API (21)

num_reperenum_communetype_reperedate_presencefiche_reperagealtitude_ign69auteur_ign69date_ign69ngf_altitudengf_auteurngf_datenn_altitudenn_auteurnn_datecommentaire1commentaire2localisationsysteme_alti_detdetermination_altixy

Click a field to see example values.

Fill	Field	Type	Description
100%	num_repereNum repere	text	Identification number of the geodetic benchmark.Numéro du repère
100%	num_communeNum commune	int	INSEE code of the municipality.Code de la commune
95.3%	type_repereType repere	text	Type of physical benchmark marker.Type de repère
99.8%	date_presenceDate presence	date	Date the benchmark's presence was last checked.Date de contrôle de la présence
100%	fiche_reperageFiche reperage	text	Link to the benchmark's location record sheet.Lien vers la fiche de repérage
100%	altitude_ign69Altitude ign69	double	Altitude of the benchmark in the NGF-IGN69 system.Altitude dans le système NGF-IGN69
99.2%	auteur_ign69Auteur ign69	text	Organisation that determined the NGF-IGN69 altitude.Auteur de la détermination dans le système NGF-IGN69
73.9%	date_ign69Date ign69	date	Date the NGF-IGN69 altitude was determined.Date de la détermination dans le système NGF-IGN69
71.9%	ngf_altitudeNgf altitude	double	Altitude of the benchmark in the NGF-Lallemand system.Altitude dans le système NGF-Lallemand
71.5%	ngf_auteurNgf auteur	text	Organisation that determined the NGF-Lallemand altitude.Auteur de la détermination dans le système NGF-Lallemand
70%	ngf_dateNgf date	date	Date the NGF-Lallemand altitude was determined.Date de la détermination dans le système NGF-Lallemand
41.8%	nn_altitudeNn altitude	double	Altitude of the benchmark in the NormalNull system.Altitude dans le système NormalNull
39.4%	nn_auteurNn auteur	text	Organisation that determined the NormalNull altitude.Auteur de la détermination dans le système NormalNull
18.1%	nn_dateNn date	date	Date the NormalNull altitude was determined.Date de la détermination dans le système NormalNull
27.4%	commentaire1	text	First free-text comment about the benchmark.First free-text comment about the benchmark.
5.8%	commentaire2	text	Second free-text comment about the benchmark.Second free-text comment about the benchmark.
54.5%	localisation	text	Description of the benchmark's location.Description of the benchmark's location.
100%	systeme_alti_detSysteme alti det	text	Altimetric reference system used to determine the benchmark.Système altimétrique de détermination du repère
22.5%	determination_altiDetermination alti	text	Method used to determine the benchmark's altitude.Type de détermination de l'altitude
100%	x	double	X coordinate of the benchmark in the projected system.X coordinate of the benchmark in the projected system.
—	y	double	Y coordinate of the benchmark in the projected system.Y coordinate of the benchmark in the projected system.
—	point_geoPoint geo	geo_point_2d	Geographic coordinates (latitude, longitude) of the benchmark.Geographic coordinates (latitude, longitude) of the benchmark.

Schema captured from opendatasoft 3 days ago.

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Sample data (5 records)

Record 1x: 2048505.817 · y: 7282595.968

{
  "x": 2048505.817,
  "y": 7282595.968,
  "nn_date": null,
  "ngf_date": "1973-01-01",
  "nn_auteur": null,
  "point_geo": {
    "lat": 48.646609754030656,
    "lon": 7.732550505583268
  },
  "date_ign69": null,
  "ngf_auteur": "autre",
  "num_repere": "6053",
  "nn_altitude": null,
  "num_commune": 389,
  "type_repere": "Cus_cylindre",
  "auteur_ign69": "Calcul",
  "commentaire1": "Accès dangereux",
  "commentaire2": null,
  "localisation": null,
  "ngf_altitude": 148.692,
  "date_presence": "1998-03-01",
  "altitude_ign69": 149.042,
  "fiche_reperage": "https://sig.strasbourg.eu/datastrasbourg/doref/RN/RN_6053.pdf",
  "systeme_alti_det": "NGF",
  "determination_alti": null
}

Record 2x: 2049761.849 · y: 7275741.211

{
  "x": 2049761.849,
  "y": 7275741.211,
  "nn_date": null,
  "ngf_date": null,
  "nn_auteur": null,
  "point_geo": {
    "lat": 48.584388428312735,
    "lon": 7.743843511104387
  },
  "date_ign69": "1996-09-01",
  "ngf_auteur": null,
  "num_repere": "9108",
  "nn_altitude": null,
  "num_commune": 482,
  "type_repere": null,
  "auteur_ign69": "CUS",
  "commentaire1": null,
  "commentaire2": null,
  "localisation": null,
  "ngf_altitude": null,
  "date_presence": "1996-09-01",
  "altitude_ign69": 141.158,
  "fiche_reperage": "https://sig.strasbourg.eu/datastrasbourg/doref/RN/RN_9108.pdf",
  "systeme_alti_det": "IGN69",
  "determination_alti": null
}

Record 3x: 2051553.993 · y: 7274073.92

{
  "x": 2051553.993,
  "y": 7274073.92,
  "nn_date": null,
  "ngf_date": "1980-01-01",
  "nn_auteur": null,
  "point_geo": {
    "lat": 48.56842955793206,
    "lon": 7.7666923668959535
  },
  "date_ign69": "1990-11-01",
  "ngf_auteur": "ENSAIS",
  "num_repere": "3722",
  "nn_altitude": null,
  "num_commune": 482,
  "type_repere": "Cus_cylindre",
  "auteur_ign69": "CUS",
  "commentaire1": null,
  "commentaire2": null,
  "localisation": "RUE D'ESCHAU",
  "ngf_altitude": 139.198,
  "date_presence": "2004-01-01",
  "altitude_ign69": 139.546,
  "fiche_reperage": "https://sig.strasbourg.eu/datastrasbourg/doref/RN/RN_3722.pdf",
  "systeme_alti_det": "IGN69",
  "determination_alti": null
}

Record 4x: 2051193.788 · y: 7274784.681

{
  "x": 2051193.788,
  "y": 7274784.681,
  "nn_date": null,
  "ngf_date": "1976-01-01",
  "nn_auteur": "ENSAIS",
  "point_geo": {
    "lat": 48.57500930054091,
    "lon": 7.762415343651811
  },
  "date_ign69": "1976-01-01",
  "ngf_auteur": "ENSAIS",
  "num_repere": "2138",
  "nn_altitude": 139.466,
  "num_commune": 482,
  "type_repere": "Cus_cylindre",
  "auteur_ign69": "CUS",
  "commentaire1": "23, Quai des Alpes, rue de Palerme.",
  "commentaire2": null,
  "localisation": null,
  "ngf_altitude": 139.675,
  "date_presence": "2015-08-13",
  "altitude_ign69": 140.024,
  "fiche_reperage": "https://sig.strasbourg.eu/datastrasbourg/doref/RN/RN_2138.pdf",
  "systeme_alti_det": "IGN69",
  "determination_alti": null
}

Record 5x: 2047202.478 · y: 7276712.797

{
  "x": 2047202.478,
  "y": 7276712.797,
  "nn_date": null,
  "ngf_date": null,
  "nn_auteur": null,
  "point_geo": {
    "lat": 48.59451972562322,
    "lon": 7.710021253232002
  },
  "date_ign69": "2021-01-04",
  "ngf_auteur": null,
  "num_repere": "91208",
  "nn_altitude": null,
  "num_commune": 482,
  "type_repere": "autre",
  "auteur_ign69": "ENSAIS",
  "commentaire1": null,
  "commentaire2": null,
  "localisation": null,
  "ngf_altitude": null,
  "date_presence": "2021-04-01",
  "altitude_ign69": 144.153,
  "fiche_reperage": "https://sig.strasbourg.eu/datastrasbourg/doref/RN/RN_91208.pdf",
  "systeme_alti_det": "IGN69",
  "determination_alti": "encadre"
}

Live sample captured at profiling time — values may have changed upstream.

Verification Status

Using the API

Configuration

Base URL: https://data.strasbourg.eu/api/explore/v2.1/catalog/datasets/canevas-altimetrique

License

Licence Ouverte 2.0 (France / Etalab)Open

✓ Redistributable
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Query examples

curl -s 'https://data.strasbourg.eu/api/explore/v2.1/catalog/datasets/canevas-altimetrique/records?limit=20' -H 'Accept: application/json'

First 20 records of the dataset as JSON.

Uses the Opendatasoft Explore v2.1 syntax — supports select, where, group_by and order_by.

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per ipmeasured

observed 3 days ago

Dataset

Volume & freshness

Records

1.3k

1288

Last upstream update

2 years ago

2024-12-31

License

No license declared upstream.

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Altimetric Reference NetworkCanevas altimétrique

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Data schema (22 fields)

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Sample data (5 records)

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Dataset

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Machine-readable & source