Angular and linear units in the projection file

re: Angular and linear units in the projection file

dknudsen — Mon, 22 Jun 2009 13:27:34 GMT

I have actually attempted to modify a projection definition to use inches rather than feet. In the ArcGIS Desktop interface inches is available as a unit choice in a drop-down list, or the custom number of units per meter field can be filled in. However, I find that if the projection unit is not feet or meters, then ArcMap disables the scale control. I wonder if this represents an oversight, if it's by design, or if I am doing something incorrectly...

re: Angular and linear units in the projection file

marg3002 — Tue, 23 Jun 2009 22:42:22 GMT

There are enhancement requests in our system, asking that ArcMap read units other than foot (US and Intl); meters and decimal degrees for data that can be used in projection files. This is particularly important when creating a custom coordinate system to align CAD data, as described in Knowledge Base articles 29129 and 32939 from the ESRI Support Center. We hope to have this implemented soon, so that measurements can be made even if the units of the Data Frame are set to a unit such as inches, or millimeters.

re: Angular and linear units in the projection file

Helenak — Thu, 19 Nov 2009 10:52:33 GMT

Dear Dr. Buckley,

Your explanation is much better than my GIS teacher.

Thank you very much.

Recently, I have a problem transferring GCS 1984 (unit: degree) to Behrmann (unit: km).

The projection was all right, but the unit was not.

Do you have any advice ?

Thank you in advance.

Elaine