WOC2005 mapping with GPS

1. WOC2005 mapping with GPS Kazushige HatoriWOC2005 mapping team

2. Summary • General report of WOC2005 mapping • How to use GPS for o-mapping ? • How effective is GPS ? • GPS use in the future

3. WOC2005 mapping facts General report of WOC2005 mapping • Excluded GPS gear cost and printing etc. • GPS was done in 70% mapping area, Whole competition area are covered

4. Time consumption in WOC2005General report of WOC2005 mapping - WOC competition maps • It takes 2.5 - 4 days per 1km2 GPS measurement • 10 - 15 days for 1km2 mapping • On average 15days per km2for Japanese mappers • Foreign pro-mappers were 125% faster

5. Japanese vs. Foreign professionalsGeneral report of WOC2005 mapping • Generally speaking • Japanese mappers were very experienced and also have very similar to each other in contour interpretation • Foreign professional mappers have their own “style” of contour interpretation We sometimes said “These Scandinavian contours need to be translated to Japanese and International”and we did likewiseThe mountainous Japanese terrain is also challenging: even for international elite mappers 

6. Summary 2 • General report of WOC2005 mapping • How to use GPS for o-mapping ? • How effective is GPS? • GPS use in the future

7. GPS use for mappingHow to use GPS for o-mapping ? • We use GPS only for improving the basemap • We didn’t use GPS for real-time electronic mapping

8. What should be prepared ?How to use GPS for o-mapping ? • Trimble Pathfinder ProXR and software Pathfinder office for 10 000EURO • Differential GPS information availability • OCAD 8+ • Base map with local coordinates • Joyful heart for GPS measurement

9. GPS measurementHow to use GPS for o-mapping ? • Measure most paths/roads (sometimes by car) • Measure ca.15-20 point features per 250m square – for ca.1hour • Differential correction(realtime or postprocessing) • Export data as DXF format

10. Making base mapHow to use GPS for o-mapping ? • Scan local coordinate basemap • Set the basemap on OCAD using ‘template adjust’ according to local coordinates • Import GPS DXF data and allocate suitable symbols to each GPS feature • Printout the improved basemap.

11. Basemap sampleHow to use GPS for o-mapping ?

12. Summary 3 • General report of WOC2005 mapping • How to use GPS with o-mapping ? • How effective is GPS? • GPS use in the future

13. GPS accuracyHow effective is GPS ? • 95% of points are within 2m horizontally • 2m is good reliability for mapping- If the error is more than 5m the data should not be used for mapping • Altitude info is useless (see basemap)

14. GPS advantageHow effective is GPS ? • Less and less pace counting is needed • Absolute positions are very helpful to improve mapping, and to save 25% off the fieldwork time • Easy to see the basemap error • Mapper gets overview of terrain in advance or.. • Sharing mapping work with non-mappers

15. GPS disadvantageHow effective is GPS ? - FOR NOW! • DGPS information definitely needed • Top range GPS equipment very expensive

16. Summary 4 • General report of WOC2005 mapping • How to use GPS with o-mapping ? • How effective to use GPS ? • GPS use in the future

17. GPS use in the future • Real-time mapping with GPS may NOT be viable at mapping for the time being (drawing contours always taking much more time) • If more accurate basemaps are available, less requirement for GPS

18. GPS use in the future 2 • Wide Area Argument System(WAAS) and Stationary GPS satellites (ex. Galileo) will be available soon in Japan and Europe • Differential info will no longer be needed and it makes accurate GPS equipment cheaper • GPS measurement will still be a good complement, even to a very accurate basemap