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Map Scales and Distortions

Find area distortion; trim data to quadrangle


clipdata Clip data at +/-pi in longitude, +/-pi in latitude
distortcalc Distortion parameters for map projections
maptrims Trim regular data grid to latitude-longitude quadrangle
mdistort Display contours of constant map distortion
tissot Project Tissot indicatrices on map axes


Visualize Spatial Error in Maps

A standard method of visualizing map projection distortion is to project small circles spaced at regular intervals across the globe.

Quantifying Map Distortions at Point Locations

Compute location-specific map error statistics using the distortcalc function.

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