Unformatted text preview: errors may cancel out Distance from zone boundary • measure the distance from each pixel to the nearest part of its zone boundary, and assign this value to the pixel o boundary is defined as the pixels which are adjacent to pixels of different values Shape of zone • measure the shape of the zone and assign this to each pixel in the zone o one of the most common ways to measure shape is by comparing the perimeter length of a zone to the square root of its area o by dividing this number by 3.54 we get a measure which ranges from 1 for a circle (the most compact shape possible) to 1.13 for a square to large numbers for long, thin, wiggly zones • commands like this are important in landscape ecology o helpful in studying the effects of geometry and spatial arrangement of habitat e.g. size and shape of woodlots on the animal species they can sustain e.g. value of linear park corridors across urban areas in allowing migration of animal species...
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- Fall '08