I have a simple win form app with a map control on it. The map has a layer (MADtedLayer) that was initialized from a catalog in a personal database (Access). The files displayed are DTED. I need to be able somehow to detect the file names of the currently visible files (that is, the files that intersect with the current extent of the map)
Opening the database with MSAccess, I see that for the catalog, there are 2 tables, "MyCatalog" and "MyCatalog_Shape_Index". In table "MyCatalog_Shape_Index" there are 5 fields, "IndexedObj","MinGX",MinGY","MaxGX","MaxGY". I suppose that maybe I could make use of them but I cannot understand what those fields represent or how their values are calculated.
For example, for a file with LowerLeft=19.00'00" - 34.00'00" and UpperRight=20.00'00" - 35.00'00" I get MinGX = 51001618, MinGY=91266936, MaxGX=53688209 and MaxGY=93953528.
Any help or clarification would greatly appreciated.