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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

APIExecutable4/7Query nowOpen workbenchSubscribe🇨🇭Switzerland

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…

61
good

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Data schema (4 fields)

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FieldTypeDescription
IDdoubleUnique identifier of the isoline feature.Unique identifier of the isoline feature.
ALTITUDEdoubleElevation value in metres represented by the isoline.Elevation value in metres represented by the isoline.
OBJECTIDoidInternal unique identifier for the geographic record.Internal unique identifier for the geographic record.
Shape__LengthSHAPE.LENdoubleLength of the isoline geometry, likely in metres.Length of the isoline geometry, likely in metres.

Schema captured from arcgis 3 days ago.

Query the data

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Sample data (3 records)

IDALTITUDEOBJECTIDShape__Length
12533011813.46100160037
12641021197.6300145714001
538031332.7349529218302

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.

Full API documentation ↗

Dataset

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