A uniform sky illumination model to enhance shading of terrain and urban areas.

From: Cartography and Geographic Information Science | Date: January 1, 2006| Author: | Copyright information

Introduction

Illumination models are important in computer graphics to create realistic surface renderings. These models consist of a source of illuminating light and an illuminated surface, and they can include atmospheric attenuation between the source and the surface, as well as ambient light distributed uniformly over the model (Foley et al. 1990).

Cartographers consider the same factors when shading terrain. Imhof (1982) discussed adding ambient light to uniformly brighten hill shading, and Thelin and Pike (1991) used ambient light in their shaded-relief map of the ...

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