INTRODUCTIO2 - INTRODUCTION a raster GIS must have...

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INTRODUCTION a raster GIS must have capabilities for: o input of data o various housekeeping functions o operations on layers, like those encountered in the previous unit - recode, overlay and spread o output of data and results the range of possible functions is enormous, current raster GISs only scratch the surface o because the range is so large, some have tried to organize functions into a consistent scheme, but no scheme has been widely accepted yet o the unit covers a selection of the most useful and common each raster GIS uses different names for the functions DISPLAYING LAYERS Basic display the simplest type of values to display are integers o on a color display each integer value can be assigned a unique color o there must be as many colors as integers if the values have a natural order we will want the sequence of colors to make sense o e.g. elevation is often shown on a map using the sequence blue-green-yellow- brown-white for increasing elevation there should be a legend explaining the meaning of each color
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