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Author Topic: Coordinate System Conversion => theory and practice  (Read 3448 times)

toxicmag

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Coordinate System Conversion => theory and practice
« on: December 08, 2016, 03:27:42 PM »
Dear Support-Team and Users,

i experienced an error in the conversion of the coordinate systems.

Many of my clients in Germany still use the oldfashioned Gauss-Krueger-Format for their GCPs.
My aerial footage stores UTM positions in the photos EXIFs.

I was working on a site which is ~100m above sea level. My flying altitude was 100m and so the correct positioning of my EXIF data is at 200m for each photo.

To base this data on the same system i converted to Gauss-Krueger according to the EPSG-code my client is using (31467) and by definition the projection for Gauss-Krueger is based on a Geoid and the height-value is ~49m lower. So my flying altitude now is at 151m - at least the position of the photos.

This is not correct and does not match with the GCPs of my client which were recorded in Gauss-Krueger and the height value on ground-level is also 100m in their system. So when i imported their GCPs into my pre-processed model based on my EXIF data, their GCPs all were "floating" in 50m height.

I experimented with the "ground altitude (m)" in the Reference Settings Dialog but without any solution.

#multirotor #VTOL #Trinity #Quantum-Systems #a6000 #a7R #RedEdge #ALTUM #RX1II

Alexey Pasumansky

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Re: Coordinate System Conversion => theory and practice
« Reply #1 on: December 08, 2016, 03:44:43 PM »
Hello toxicmag,

Can you send to us or post here the list of camera coordinates (as measured) and GCP coordinates?
Best regards,
Alexey Pasumansky,
Agisoft LLC