Problem with creation of buffer from multiple context FDO

[jcsilva]

When creating a buffer with the .net viewer, from an FDO source with more than one coordinate system context, the buffer.aspx assumes the first context for the buffer measure, not the selected features context.

In a case where the selected features are in a projected context, but the first context of the feature source is lat lon, one of two things happen: 1) The merge flag is active: There's a memory usage peak and the buffer fails. 2) The merge flag is inactive: There's no failure, but no buffer creation.

The buffer.aspx, buffer.jsp and buffer.php must be corrected to calculate the measure in the selected features coordinate context. Not the first one on the list.

This is as it is now:

MgResourceIdentifier featSourceId = new MgResourceIdentifier(selLayer.GetFeatureSourceId());
MgSpatialContextReader ctxs = featureSrvc.GetSpatialContexts(featSourceId, false);
String srsDefDs = "";
if (ctxs != null && ctxs.ReadNext())
    srsDefDs = ctxs.GetCoordinateSystemWkt();

[tomfukushima]

Hi jcsilva, Thanks for reporting this problem with those good details. Do you happen to have a fix/patch that we can review and apply? :) Thanks, Tom

[jcsilva]

Nope, sorry. I understand the problem, but I don't know the API enough to correct it. The workaround I'm using is duplicating the source and force a coordinate system on each. I'll return to that code later and give it a go. ;-) Joao

[jbirch]

Closing old unversioned ticket. Please re-open and set the version if this still occurs against 2.1.