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Map algebra
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<p>Map algebra is an <a href="/facts/Algebra/nMdqczjo">algebra</a> for manipulating <a href="/facts/Geographic_data/FUSjSQ71">geographic data</a>, primarily <a href="/facts/Field_(geography)/mMvCSKAD"> fields</a>. Developed by Dr. <a href="/facts/Dana_Tomlin/HQFlhnLH">Dana Tomlin</a> and others in the late 1970s, it is a set of primitive operations in a <a href="/facts/Geographic_information_system/PoP1kVoa">geographic information system</a> (GIS) which allows one or more <a href="/facts/Raster_graphics/HkXNc8oI">raster</a> <a href="/facts/Layers_(digital_image_editing)/InBRq6UF">layers</a> ("maps") of similar dimensions to produce a new raster layer (map) using mathematical or other operations such as addition, subtraction etc. </p>