ER Mapper offers an extensive array of filters, including low and high pass, sun angle, and a set of specific use filters. Users may also change the weighting factors in the convolution kernel, or moving matrix of numbers. Specific use filters are included for seismic and geophysical work. Users may also include their own special use filters if the code for their filters is written in C or Fortran. Masks may be specified with ER Mapper's equation editor.
Complex formulas can be input that refer to relationships between the various layers.
Windows that are linked together are also resized together and geolinked in various ways. Geolinked windows can also be layered, each showing different bands of the same image. The overlay area appears in the top window and the rest of the image is shown with the band combination of the bottom window. Geolinking can also be performed with multiple base maps. ER Mapper's speed is impressive, especially considering the volume of data being processed.