Information Technology Policies and Standards
|Global Positioning System (GPS) Devices|
|Information Technology Procurement|
To Be Reviewed
|Applies to City purchases of Global Positioning System (GPS) devices.|
This standard replaces "GPS Devices Standard," January, 2005.
|GPS devices should be compatible with ESRI data formats, such as a shapefile. At a minimum, the GPS device should be able to export an ASCII text file or other tabular format of the coordinates collected. Information collected on the GPS unit should be downloadable to a PC via USB or other connection.|
Additional Guidelines for GPS Devices
Reception: It is highly recommended that any GPS unit purchased for City usage is at minimum, a 12 channel GPS receiver. This will allow it to track up to 12 satellites at once. Please note that while more expensive GPS units generally have greater accuracy, they still are subject to the same environmental reception obstructions, such as topographic features that impede satellite signal, trees or other foliage, and buildings or other structures.
Accuracy: In ideal conditions, expect to know your position to within 10 meters, 5 meters if your receiver is WAAS (Wide Area Augmentation System) enabled. More expensive GPS units usually become more accurate, up to within a few centimeters for survey grade GPS.
Memory: Depending on the GPS unit and the intended use, it is recommended that at a minimum, the device can hold 500 waypoints. Many GPS units now come with expandable SD card memory or compact flash memory to handle larger datasets and applications.
Software: Less expensive GPS units usually have proprietary software that does not allow you to install extra applications. These units might allow you to connect to a computer to download data, and may even allow for export of that data in shapefile format (directly compatible with ESRI). If you need to view City data on your GPS or edit data on the GPS you will probably need to purchase a GPS unit that can run Windows Mobile (or Windows CE), similar to many PDAs. Windows Mobile allows you to install ArcPad from ESRI or PathFinder from Trimble. It will also run a mobile version of Microsoft Office and many other Windows compatible programs.
|GPS devices purchased for City use should be compatible with the City’s Geographic Information Systems.|
This guide enables prospective users of GPS devices to procure the appropriate resources to fulfill the data collection requirements. The guide will also help ensure the data is accessible and usable with other City GIS software.
|Contact: Mark T. Leech, (505) 768-3731|