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Aabel Worksheet Map Projection Utilities

If the polygons are imported as numeric data with no explicit sample space, cartographic coordinate transformations are required to store the data as longitude-latitude or to define them using a different projection system. Aabel worksheets provide map projection utilities to allow the following transformations:

Forward projections, which represent transformation of the spherical longitude-latitude coordinate system of the earth to the X-Y coordinate system of paper
Inverse projections, which allow you to transform the initially projected coordinates back to longitude and latitude

Aabel includes 19 projection systems and the geographic coordinate system.

The state plane coordinate system is specific to US, and once a zone and the datum are selected, Aabel will automatically use the state-legislated projection and unit for that zone, as defined in NAD27 and NAD83.

You can execute coordinate transformation for any number of selected coordinate pairs rapidly, as shown in the image below: