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Maximizing GPS Accuracy for Mapping Purposes

Learn how to optimize GPS accuracy for mapping projects. Discover when and how to use GPS effectively, which units to choose, and best practices for data recording and processing. Explore the advantages, disadvantages, and benefits of using GlobalMapper in conjunction with GPS mapping. Dive into tips for orienteering maps and magnetic declination calculations. Start improving your mapping accuracy today!

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Maximizing GPS Accuracy for Mapping Purposes

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  1. Optimizing GPS accuracy Bence Sprok 16/08/2009 - Miskolc

  2. Why and when shall we use GPS? - Shall not be used for sprint maps - Useful when no base map is available - Or only aerial photo is present - Early phase – creating base map, polygons - Might not be fast for later processes

  3. What kind of unit? - “Hobby” type will be fine - We don't need professional units (cost 5000 €<) - At least 2, but preferably 3-4 different ones - High sensitive receiver (SiRF III< , MTK, etc.) - External antenna is highly recommended - Forget the “built-in” types (Forerunner and others) and the car navigation systems - Look for the trackpoint memory

  4. ~350 € ~20 € ~60 € ~60 € ~60 €

  5. How to use? - All GPS work simultaneously - Use distance based recording (~3m) instead of time interval, if possible. - Along with the “analog” accessories (board, pen, notes) - Try to keep them as high as possible (special cap, backpack) - Try to plan your work according to the satellites' positions - One track is not a track. Try to track main features more than once in different time period. - Use waypoints

  6. - Download your work with your favourite program - Edit it - erase unnecessary parts - Filter it if you used time interval method - Convert it to .gpx format If needed, use gpsbabel to do that - Transform from WGS'84 to the desired projection My suggestion is GlobalMapper

  7. Why do we need GlobalMapper if OCAD is present? - GlobalMapper supports any kind of projection (OCAD supports only the most commonly used) - Watch for the map datum and projection (according to your source) - Bearing must not distort (it's a must for any kind of topographic map)

  8. Magnetic declination - Orienteering maps represent magnetic North - Calculate the declination online http://www.ngdc.noaa.gov/geomagmodels/Declination.jsp

  9. Advantages - Disadvantages +Saving time + Better accuracy in certain cases + Reference aerial photos (GM/OCAD) + Combine mapmakers’s work - Pine forest, deep valleys - Height (z-level) data - More work for preparing - Costs?

  10. Questions?

  11. Wake up! Lunch time!

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