WOC2005 mapping with GPS

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WOC2005 mapping with GPS

• Kazushige HatoriWOC2005 mapping team

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Summary

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

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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

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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

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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
  Internationaland we did likewiseThe
  mountainous Japanese terrain is also challenging
  even for international elite mappers ?

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Summary 2

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

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GPS use for mappingHow to use GPS for o-mapping
?

• We use GPS only for improving the basemap
• We didnt use GPS for real-time electronic
  mapping

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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

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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

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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.

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Basemap sampleHow to use GPS for o-mapping ?
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Summary 3

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

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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)

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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

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GPS disadvantageHow effective is GPS ?

• - FOR NOW!
• DGPS information definitely needed
• Top range GPS equipment very expensive

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Summary 4

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

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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

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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