GIS Transformations

Objectives of lecture:

Announcements
Transformations (demonstrations and examples)

Transformations are everywhere...

Analysts usually don't have the measurements they really want.

Conversion from one set of units to another

Dane County Soil Erosion: from physical model to land owner parcel
Forests of France: from actual forest outlines to density by political unit
Point samples INTERPOLATED to a smooth surface

Transformations by different mechanisms (neighborhood and attribute combination rule)

Overlay as a simple kind of transformation
Neighborhood operations (such as smoothing)
Iterative operations (viewshed, accumulated cost)
and more complex...

Demonstrations

Warm up: summarizing a distribution by different units

Calculate distance

Cost path

Version of 16 February 2000