The class for reading DTED formats is IlvDTEDReader. This class is a subclass of IlvMapFeatureIterator and returns only one IlvMapFeature object, which is the raster corresponding to the Digital Terrain Model (DTM) stored in the file. The geometry of this map feature is of type IlvMapRaster. The map feature has no attribute. The projection of the reader is the source projection of the DTED data, that is, the geographic projection.

The IlvDTEDLayer class defines load-on-demand for the DTED format. Load-on-demand is implemented on a DTED-level basis from the corresponding file name. In other words, the size of a tile in a Views Maps tiled layer will correspond to the size of a DTED tile. This specific implementation of load-on-demand works exclusively with maps drawn with the geographic projection. For an example, see the DTED demonstration at the following location:

For more information, see Using Load-On-Demand.