Spatial reference specifications

developers.arcgis.comsite

List of Well-Known ID (WKID) integer value or a text string definition referred to as Well-Known Text (WKT) to define a spatial reference.

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ArcGIS Developer

added

2026-10-10

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ArcGIS Developer › Specifications: “List of Well-Known ID (WKID) integer value or a text string definition referred to as Well-Known Text (WKT) to define a spatial reference.”