  The datum of Olson Global Ecosystems characteristics of Earth, provided there, derived 
from raster data of Global Land Cover Characteristics (GLCC) database, version 2.0, 
distributed by the USGS EROS data center. Base resolution of the datum is 30".
  The datum presented here generally in form of .ZRS-files (stands Zipped Raster Set),
which is proprietary compressed format of author of the datum. Separated files of the datum
are in hierarchical and multi-resolution relation for optimization of speed and appearance 
upon using in Spatial Aspect Viewer and Spatial Aspect Explorer software products of author.
  Also the datum contents set of spatial regions covering main geographical features of 
Earth, including continents, separated mountains, ranges, peninsulas, selected areas,
islands and lakes.

See site of author: www.runspect.com for more details.
Copyright (c) 2011-2016 Yuri Feldman
