Making Sure There Is a Base Map
Your GIS will include, probably, a multitude of layers. The existence of a base map—a cartographically or photographically produced product of, usually, great accuracy, high precision, and great detail to which all other products of the GIS can be referenced—is essential. To attempt to build GIS products without first developing (or otherwise obtaining) a geographic base map is folly. But be aware: To use primarily GPS to create GIS data sets intended to serve the base map function is a monstrous undertaking.
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