Contour lines of the old alluvium envelopeIsolignes de l'enveloppe de l'alluvion ancienne
Isolignes de l'enveloppe de l'alluvion ancienneContour lines of the old alluvium envelope
This dataset provides contour lines (isolines) describing the upper surface of geological formations classified as old alluvium (alluvion ancienne) in the canton of Geneva, Switzerland. The lines were derived from a digital interpolation model of this surface, using a 50-metre equidistance between contours. To produce a smoother visual rendering, the contour lines were subsequently reworked through a smoothing process that does not alter the underlying elevation information. The dataset is published by the Geneva territorial information system (Système d'information du territoire genevois, SITG) and is useful for geological and land-use studies at cantonal level.Les isolignes ont été calculées à partir du modèle numérique d'interpolation du toit des formations attribuées à l'Alluvion ancienne avec une équidistance de 50m. Afin de donner un rendu plus doux les courbes de niveaux ont été retravaillée par le biais d'un lissage qui ne modifie en rien l'informa…
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Data schema (4 fields)
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| Field | Type | Description |
|---|---|---|
| ID | double | Unique identifier of the isoline feature.Unique identifier of the isoline feature. |
| ALTITUDE | double | Elevation value in metres represented by the isoline.Elevation value in metres represented by the isoline. |
| OBJECTID | oid | Internal unique identifier for the geographic record.Internal unique identifier for the geographic record. |
| Shape__LengthSHAPE.LEN | double | Length of the isoline geometry, likely in metres.Length of the isoline geometry, likely in metres. |
Schema captured from arcgis 3 days ago.
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Sample data (3 records)
| ID | ALTITUDE | OBJECTID | Shape__Length |
|---|---|---|---|
| 125 | 330 | 1 | 1813.46100160037 |
| 126 | 410 | 2 | 1197.6300145714001 |
| 5 | 380 | 3 | 1332.7349529218302 |
Live sample captured at profiling time — values may have changed upstream.
Verification Status
Using the API
Configuration
- Base URL
- https://vector.sitg.ge.ch/arcgis/rest/services/GOL_ALL_ANCIENNE_ISOLIGNE/FeatureServer
License
Terms stated by the source (not a recognized license):
© 2026 SITG
Query examples
curl -s 'https://vector.sitg.ge.ch/arcgis/rest/services/GOL_ALL_ANCIENNE_ISOLIGNE/FeatureServer?f=json' -H 'Accept: application/json'Service definition: the list of layers.
Dataset
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