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GDA (Geologic Data Assistant) is an extension to ArcPad, a mobile mapping software program by Environmental Systems Research Institute (ESRI) designed to run on personal digital assistant (PDA) computers. GDA and ArcPad allow a PDA to replace the paper notebook and field map traditionally used for geologic mapping. GDA allows easy collection of field data that include:

Station location as determined by GPS, map inspection, or as a bearing and distance offset from an existing station

This report provides a link to downloadable code, describes the required hardware and software necessary to use GDA, describes the GDA data structure, gives setup instructions for GDA, describes moving data from GDA into a desktop GIS, and discusses customization of GDA. To use GDA efficiently will require an intermediate knowledge of computer systems and, most importantly, good file management. GDA does not have to be used in conjunction with ESRI's ArcMap, but knowledge of that program is useful for customizing certain GDA files and viewing shapefiles. Haugerud and Thoms (2004) discuss rationales behind some of the choices made in building GDA.

Note that the GDA code includes HTML help files that discuss setup and use of the software. Much of this report is copied from the GDA help files.

There are 2 downloadable GDA packages from which to choose depending on the intended host system.

For installation on a Windows PC, download GDA_PC_Install.zip. This package contains the loose files and a simple DOS batch file to copy them to the appropriate directories. This is also the package to download for further development of GDA in ArcPad Application Builder.

For installation on a Windows CE device, download GDA_For_PPC.CAB.

Get a copy of this documentation as zipped html or PDF.

To use GDA, you should have some familiarity with your PDA, with ArcPad, and with some basic principles of GIS.

First, use your PDA. Learn how to open programs and switch between them. Experiment with the several different methods of text input, to find what works best for you. Learn how to change screen brightness. Poke around in the system settings. Windows CE has changed significantly with each release. Our experience is primarily with WinCE 3.0; if you are using a later version, some of our PDA-related advice may be wrong.

Configuring the communications link between the PDA and an external GPS receiver can be challenging. The instructions that work for our hardware and operating system are likely to be wrong for your setup. You will have read your manuals (this may not help much) and experiment.

Second, look through the ArcPad user manual (available here). Pay attention to the layer metaphor, the notion of an active layer, the limits of ArcPad symbolization, and how a map projection can be defined.

Third, you should have a basic understanding of map projections and datums. You should appreciate the distinction between the contents of a spatial database and the symbolization of those contents on a map or computer screen.

ArcPad, and thus GDA, runs on the Windows CE 3.0 (or greater) operating system, also known as the PocketPC operating system. It can also be installed on Windows-based desktop, laptop, or tablet computers. It does not work on Palm or Linux devices. Most WinCE computers are adequate. When selecting a PDA, pay particular attention to display readability, communications capabilities, battery life, the quality of the digitizer, memory capacity, and speed. We are currently using Hewlett-Packard iPAQs with 400MHz processors, 64MB memory, and 240 x 320 pixel 16-bit color daylight-readable displays.

An extended-capacity battery, or an expansion pack with an additional battery, is desirable. You would like to have enough power for continuous operation throughout a 14-hour field day. When using a GPS it is especially useful to set your PDA to never shut off. One reason for this is simply efficiency, but the other is that turning a PDA off without first disconnecting the com port often causes the PDA to lock up so that it can only be reset with a soft reboot. The largest drains on the battery are the intensity of the backlight and the length of time it is on, so set your backlight to dim to nothing after a short period of inactivity.

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