Distortion Wizard for CONUS

  • 1. Select system
  • 2. Set your zone
  • 3. Analyze distortion

What is the distortion of the coordinate system I work with?

  • Are the distances I measure on the map close what they are on the ground?
  • How does my State Plane or UTM map-projected coordinate system perform?
  • Select a system to find out!
Select your system:

State Plane Coordinate System (SPCS)

Universal Transverse Mercator coordinate system (UTM)

(available for the Contiguous United States)

Nagivate and click once on the map to set your area of interest.

Linear distortion for

Distortion legend
Low distortion
< -400 ppm (< -2.0 ft/mi)
-300 to -400 ppm
-200 to -300 ppm
-100 to -200 ppm
-80 to -100 ppm
-60 to -80 ppm
-40 to -60 ppm
-20 to -40 ppm
±20 ppm (±0.1 ft/mi)
+20 to +40 ppm
+40 to +60 ppm
+60 to +80 ppm
+80 to +100 ppm
+100 to +200 ppm
+200 to +300 ppm
+300 to +400 ppm
> +400 ppm (> +2.0 ft/mi)
Generating the distortion map
for your zone...

Low Distortion Projection Design

A tool for the design of low distortion map-projected coordinate systems