Cartographic information is essential for planning and implementing a forest inventory. Especially useful are large-scale maps (scale from 1:10,000 to 1:100,000), soil or geologic survey maps, standard aerial photographs (scale from 1:6,000 to 1:12,000; preferably as overlapping stereopairs), and multi-spectral satellite images. Sketch maps drawn by experienced collectors can also be very helpful.
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