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Participatory use of GIS using mobile GIS

Participatory use of GIS using mobile GIS. Jeroen Verplanke. Using GPS and PDA in Practice. About PDA the Personal Digital Assistant. The HP-iPAQ pocket PC 64 Mb RAM memory - no HDD 16Mb – 256Mb optional SD memory 400 Mhz processor running MS-Windows-CE 4 – 8 hours operating time

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Participatory use of GIS using mobile GIS

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  1. Participatory use of GISusing mobile GIS Jeroen Verplanke

  2. Using GPS and PDA in Practice

  3. About PDAthe Personal Digital Assistant • The HP-iPAQ pocket PC • 64 Mb RAM memory - no HDD • 16Mb – 256Mb optional SD memory • 400 Mhz processor • running MS-Windows-CE • 4 – 8 hours operating time • Highly portable but small screen

  4. Tablet PC • Full PC (Windows XP & all software) • Pentium M 1 GHz processor • 512 Mb RAM • 30 GB hard disk • Large screen • (only) 4 hours operating time

  5. Compaq 3950 256Mb flash About Pocket PC (PDA) • Easy installation of software • Easy synchronization of files

  6. About ArcPad™ • Convert GPS readings ‘on-the-fly’ to the coordinate system in use. • Any image, GT-Sheet, or shapefile can be displayed in Arc-Pad. • The user can save the GPS-Track log (as points), or prepare new shape files. • The software also allows to prepare forms

  7. SID IMG About ArcPad™ By using MrSID data compression Images can be compressed by a factor 25!!! Example: compressed from 25 to 1 MB.

  8. GPS-iPaq Hardware Parts

  9. Field Connecting Hardware GPS physical connection A GPS serial connector wire needs to be linked to a serial connector wire attached to the iPaq. Both ends are female and need to be connected through a null-modem connector in which pins 2 and 3 are reversed (home made…).

  10. Field Connecting Hardware-2 GPS physical connection A GPS serial connector wire needs to be linked to a serial connector wire attached to the iPaq. Both ends are female and need to be connected through a null-modem connector in which pins 2 and 3 are reversed (home made…).

  11. Field Connecting Hardware-3 Connection precaution Use tape to provide the required solid ‘fix’. Connectors are not built to support much weight.

  12. Ideal tool for the 3 handed fieldworker

  13. Fully integrated solution Hardware alternatives • “Jacket” GPS • Bluetooth GPS • Comparable accuracy • Less options (black box) • All in one ruggedized GPS

  14. Hardware settings: ArcPad • Arc-Pad settings • GPS: NMEA protocal, WGS84 Datum • GPS Port: port com1, Baud 4800, Parity none, Data bits 8, Stop bits 1, Break 0.

  15. Hardware settings: GPS • GPS settings • units’ settings: position format: hddd.dddddo, map datum: WGS 84, and units: metric • ‘interface’ settings: i/o format: NMEA out, and baud rate: 4800.

  16. Accuracy Performance under trees Cycling to work during a cloudy morning provided the yellow line. It is projected on AP’s, an Ikonos image and the Top-10 of Enschede. Where high trees were present, tracking with the GPS give visible errors. ArcPad can provide accuracy warnings !!!

  17. GPS-iPaq Warnings • Not for GIS amateurs • Requires user to know facts on projection systems ‘properly’ • Requires proper preparation: • of geo-referencing images • of compressing images • of converting shapefiles • of preparing symbologies • of preparing forms • Requires proper GPS-ArcPad software settings

  18. Mobile GIS training experiences

  19. Some conclusions • Much of the quality and usefulness of the data recorded with this combination of PDA and GPS depends on the skills and knowledge of the operator.

  20. Although the tools are pretty straightforward to use, even for inexperienced users, it requires specific knowledge to prepare the right configuration in order for it to become straightforward.

  21. GPS and ArcPad™ settings will be different for each country or region and therefore need to be carefully observed and should correspond to the geo-reference and projection settings of the background data (maps and satellite images).

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