How to check if spatial reference system is GCS or PCS?

PaulSchmidt1 — Wed, 15 Dec 2010 21:25:45 GMT

Hi,
for an application I have to get the unit of the coordinate system of a featureClass. (I'm using VBA)

What I do is: I take the layer with the FeatureClass. Then give the Layer to IGeoDataset. The Reference System of the dataset I pass to IGeographicCoordinateSystem or IProjectedCoordinateSystem. Finaly i get the unit from IUnit.

My problem is: Bevor I pass to IGeographicCoordinateSystem or IProjectedCoordinateSystem, I have to know, if it is a GCS or a PCS. Otherwise I get an error.

I didn't find out how I can check this before.

Does anyone of you have an idea?

Re: How to check if spatial reference system is GCS or PCS?

MelitaKennedy — Sun, 12 Dec 2021 01:28:33 GMT

Hi,
for an application I have to get the unit of the coordinate system of a featureClass. (I'm using VBA)

What I do is: I take the layer with the FeatureClass. Then give the Layer to IGeoDataset. The Reference System of the dataset I pass to IGeographicCoordinateSystem or IProjectedCoordinateSystem. Finaly i get the unit from IUnit.

My problem is: Bevor I pass to IGeographicCoordinateSystem or IProjectedCoordinateSystem, I have to know, if it is a GCS or a PCS. Otherwise I get an error.

I didn't find out how I can check this before.

Does anyone of you have an idea?

You should be able to use something like this:

    If TypeOf pSpatialReference Is IGeographicCoordinateSystem Then
        MsgBox "GeographicCoordinateSystem"
    End If
    
    If TypeOf pSpatialReference Is IUnknownCoordinateSystem Then
        MsgBox "UnknownCoordinateSystem"
    End If
    
    If TypeOf pSpatialReference Is IProjectedCoordinateSystem Then
        MsgBox "ProjectedCoordinateSystem"
    End If

Melita

topic How to check if spatial reference system is GCS or PCS? in ArcObjects SDK Questions

How to check if spatial reference system is GCS or PCS?

Re: How to check if spatial reference system is GCS or PCS?