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FileGeoDatabase - Projection - Returns null

#1

MapSuite Team,

The below code returns a null value for the projection string.

TheFileGeoDatabaseFeatureLayer = new FileGeoDatabaseFeatureLayer(TheFilePath, TheTableName, "OBJECTID");
        
TheFileGeoDatabaseFeatureLayer.Open();
    
    TheProj4Projection = TheFileGeoDatabaseFeatureLayer.GetInternalProj4ProjectionParametersString();

Opening up some of the files of the GeoDatabase using notepad I can actually see the projection string.

The following code also returns a null:

Projection TheProjection = TheFileGeoDatabaseFeatureLayer.FeatureSource.Projection;

I am using ThinkGeo.MapSuite.Layers.FileGeoDatabase.11.0.0-beta009

The data has been uploaded to my ThinkGeo drive space at: home/Chicago_Data/GeoFileDatabase/Airport

Thanks,
Dennis

#2

Hi Dennis,

It looks the return value is correct.

image.png1289×203 18.5 KB

If you are using any other table please let me know.

Regards,

Ethan

#3

hi Ethan,

The below line of code returns a collection of table names. However, each name is preceded by a back-slash character as shown below in my application datagrid. My application programmatically used the names in the collection as-is. The problem is the back-slash. If the back-slash is present methods such as GetFirstFeaturesWellKnownType and GetInternalProj4ProjectionParametersString do not work. Remove the back-slash, as I’m now doing programmatically, and everything works.

Collection<string> TheGeoDatabaseTableNames = FileGeoDatabaseFeatureLayer.GetTableNames(ThePath);

To prevent future confusion it would be advisable to modify MapSuite GetTableNames such that leading back-slash is not included.

Thanks,
Dennis

#4

Hi Dennis,

Thanks for your suggestion, I am not sure why the first slash is keep here, but I will let our development team knows your suggestion about it.

For now I think you can use this line to make it works in your scenario:

var tables = FileGeoDatabaseFeatureLayer.GetTableNames("../../AppData/Airport").Select(x => x.TrimStart('\\')).ToList();

Wish that’s helpful.

Regards,

Ethan