Introduction

This section discusses how ArcPad handles projections and datums and also lists the projections, datums, and datum transformations supported by ArcPad.

ArcPad contains all the projection and datum transformation information from the ArcGIS Projection Engine. This information is extracted from the ArcGIS Projection Engine and embedded in the PrjData.dll installed with ArcPad. No changes are made to the information before being included in ArcPad. Only a subset of the projection algorithms and datum transformation methods are included in ArcPad, as only some of these are appropriate for field mapping.

ArcPad includes two utilities for working with projections and datums. These utilities are located in the Utilities drop-down list, which is located in the Tools drop-down list of the Main toolbar:

• Reproject Shapefile, which reprojects the selected shapefile to another projection and/or datum.
• Export Projection Information, which exports the ArcPad internal projection and datum information into text and CSV files, with a prefix of Export_. The files are exported into the System folder, under the ArcPad installation folder.