WOC 2005 mapping with GPS Kazushige Hatori WOC

WOC 2005 mapping with GPS Kazushige Hatori WOC 2005 mapping team

Summary n n General report of WOC 2005 mapping How to use GPS for o-mapping ? How effective is GPS ? GPS use in the future

WOC 2005 mapping facts General report of WOC 2005 mapping n n Excluded GPS gear cost and printing etc. GPS was done in 70% mapping area, Whole competition area are covered

Time consumption in WOC 2005 General report of WOC 2005 mapping - WOC competition maps n It takes 2. 5 - 4 days per 1 km 2 GPS measurement n 10 - 15 days for 1 km 2 mapping n On average 15 days per km 2 for Japanese mappers n Foreign pro-mappers were 125% faster

Japanese vs. Foreign professionals General report of WOC 2005 mapping n n 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 likewise The mountainous Japanese terrain is also challenging: even for international elite mappers

Summary 2 n n General report of WOC 2005 mapping How to use GPS for o-mapping ? How effective is GPS? GPS use in the future

GPS use for mapping How to use GPS for o-mapping ? n n We use GPS only for improving the basemap We didn’t use GPS for real-time electronic mapping

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

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

Making base map How to use GPS for o-mapping ? n n 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.

Basemap sample How to use GPS for o-mapping ?

Summary 3 n n General report of WOC 2005 mapping How to use GPS with o-mapping ? How effective is GPS? GPS use in the future

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

GPS advantage How effective is GPS ? n n n 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

GPS disadvantage How effective is GPS ? - FOR NOW! n DGPS information definitely needed n Top range GPS equipment very expensive

Summary 4 n n General report of WOC 2005 mapping How to use GPS with o-mapping ? How effective to use GPS ? GPS use in the future

GPS use in the future n n 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

GPS use in the future 2 n n n 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