These multiple processing operations are internally defined and, as such, are transparent to the user. The individual processes required to produce that product are automatically queued by the OPPS subsystem. Queued processing continues until the final output product is generated. As rasters are composited, unknown and cloudy pixels are replaced by pixels of known value. Both functions can operate simultaneously and there is full control of how multiple rasters are integrated.
Composite control is facilitated by prioritizing raster file attributes.
Raster compositing may be constrained by vector feature outlines. This program produces a new raster in which the snow pixels in an areal extent of snow cover raster are represented by DEM elevation values. This program accepts point and flight line observations as the x, y, and z sample data inputs into the inverse distance weighted mean spatial interpolation algorithm. The user controls where, geographically, sample points are to be gathered and how far the algorithm may search for sample observations. No-snow pixels in an areal extent of snow cover raster can be used as sample observations of zero snow cover to constrain the interpolation.