Get The Extent of Underlying Data of a Layer

SusannSchmidt

Hello,

In ArcMap I have a SpatialReference EPSG 32633 of the Dataframe and a Layer(Shape) loaded with EPSG 31494. Now I want to get the Extent of the original underlying Data. So I take my Layer as IGeoDataset:

ESRI.ArcGIS.Geometry.ISpatialReference spatialReference = (pLayer as IGeoDataset).SpatialReference; ESRI.ArcGIS.Geometry.IEnvelope envelope =  (pLayer as IGeoDataset).Extent;

The SpatialReference is 31494, but the Extent shows me the Coordinates in EPSG 32633.

In the Properties-Dialog of the Layer the Extent shows the Coordinates in 31494. How can I get these Coordinates?

Thanks for any idea.

NeilClemmons_GISinc

No, your code is incorrect:

(pLayer as IGeoDataset).SpatialReference;

You are performing a QI from ILayer to IGeoDataset.  Calling the SpatialReference property here returns the spatial reference of the layer because that's what object you're working with.

In order to get the spatial reference of the data source, you need to access the data source (not the layer):

IFeatureLayer featureLayer = yourLayer;
IGeoDataset geoDataset = featureLayer.FeatureClass as IGeoDataset;