GEOG 863
GIS Mashups for Geospatial Professionals

6.2 Querying

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One of the most common operations performed in GIS is the query. The Esri JS API makes it possible for developers to query layers in a number different ways. You might set a layer’s definition expression so that it displays just a subset of its data. You can also query a layer to get a count of features meeting the criteria, to get the IDs of the features, or to get the features (attributes & geometries) themselves.