Re-scaling Terrain Variables
نویسندگان
چکیده
Most environmental modelling takes place within the toposequence. Conventionally, the terrain variables for these purposes have been derived from digital elevation models (DEMs) produced from large scale topographic maps (e.g. 1:25,000 (approx 30 meters)) or topographic data at that scale. Coverage in Australia of this scale DEM is very limited. However, global and continental coverage of DEMs is becoming available at coarser scale. The most important data set is derived from radar images from the NASA Space Shuttle which were processed to give a 3 arc second (approximately 90 meters, SRTM-3) for nonUS landmasses. Whilst this is not at a scale appropriate to analysis of relationships within the toposequence, it does have the advantage of being readily available over broad areas.
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