6Dorrer E, Zhou X. Towards Optimal Relief Representation from Mars Imagery by Combination of DEM and Shape-fromshading. IAPRS, Stuttgart, 1998, 32, Part 4, 156- 161.
7Brewer C A. Color Use Guidelines for Mapping and Visualization. Visualization in Modem Cartography. // MaeEachren A M, Taylor D R Fods. Oxford: Pergmon Press, 1994,123 - 147.
