Transcription of CALCULATING SURFACE AREA 829 Calculating …
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Landscape area is almost always presented interms of planimetric area , as if a square kilometer ina mountainous area represents the same amount ofland area as a square kilometer in the of home ranges for wildlife speciesgenerally use planimetric area even when describ-ing mountain goats (Oreamnos americanus) andpumas (Felis concolor). But if a species behaviorand population dynamics are functions of availableresources, and if those resources are spatially limit-ed, I suggest assessing resources using SURFACE areaof the area also is a basis for a useful measure oflandscape topographic roughness. The SURFACE -arearatio of any particular region on the landscape canbe calculated by dividing the SURFACE area of thatregion by the planimetric example,Bowden et al. (2003) found that ratio estimators ofMexican spotted owl (Strix occidentalis lucida)population size were more precise using a versionof this SURFACE - area ratio than with planimetric wildlife species are identified with topo-graphic attributes, including the topographicroughness or ruggedness of the landscape.
points P and Q: where a=planimetric (horizontal) distance from P to Q, b=difference in elevation between P and Q, c=surface distance from P to Q. Distance “b”is easy to calculate because it is sim-
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