An Honest GIS (Berry) Discrete map processing (vector) assumes the joint coincidence of two maps is 100% certain… Precision focus (Delineation) …Error.

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Presentation transcript:

An Honest GIS (Berry) Discrete map processing (vector) assumes the joint coincidence of two maps is 100% certain… Precision focus (Delineation) …Error Propagation modeling (raster) determines the likelihood of coincidence throughout the intersected area. Accuracy focus (Classification)

Forest Map (vector) (Berry)

Soils Map (vector) (Berry)

Map Accuracy (Error Propagation– simple overlay) (Berry)

Soils Map (vector to raster) (Berry)

Map Accuracy (proximity to soil boundary) (Berry)

Map Accuracy (soil certainty map) (Berry)

Map Accuracy (forest certainty map) (Berry)

Map Accuracy (soil/forest Joint Probability map) (Berry) Joint Probability — likelihood of two Joint Probability — likelihood of two conditions occurring together… P(x,y) = P(x) * P(y) …evaluated cell-by-cell P(x) P(y) P(x,y) Joint Probability

Map Accuracy (Error Propagation– overlay certainty map) (Berry)

Map Accuracy (Error Propagation– S2F5 coincidence certainty) (Berry)

Map Accuracy (Error Propagation– S2F5 certainty summary) (Berry) …about 50% is <.70 certainty