LSI Convolution is a very helpful tool for students.
Two key properties in signal processing are "linearity" and "spatial invariance". Students can examine these properties by placing and scaling two impulse functions and then dragging a filter function over them (just as in the Impulse Response applet).
It is an AutoCAD plug-in that allows you to import and manage spatial data.
Combines geometries using the spatial methods STDifference, STIntersection, etc.
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