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

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Optimizing GPS accuracy

Bence Sprok

16/08/2009 - Miskolc

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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

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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

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~350 €

~20 €

~60 €

~60 €

~60 €

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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

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- 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

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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)

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Magnetic declination

- Orienteering maps represent magnetic North

- Calculate the declination online

http://www.ngdc.noaa.gov/geomagmodels/Declination.jsp

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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?

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Wake up!

Lunch time!

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