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I am a GIS specialist and a surveyor. Lately I'm trying to use as a surveying tool my DJI Phantom 3 pro combining with different software for generating DEM, DSM, 3d model and orthophoto. But I can't generate true orthophoto from the software I used like Agisoft or pix4d, orthophoto after generated is deformed like in the pictures below.

My workflow was:

  1. I added the photos
  2. I Loaded the camera positions (with EXIF info on)
  3. I aligned the photos
  4. I optimized camera alignment with these settings
Camera accuracy: 10 
Marker accuracy: 0.005 (not utilized)
Scale bar accuracy: 0.001 (not utilized)
Projection accuracy: 0.1
Tie point accuracy: 4
  1. I builded Dense Cloud with quality Medium and depth filtering Aggressive
  2. I builded mesh with surface type Height field, source data Dense cloud and face count Medium, Interpolation enabled
  3. I builded texture with mapping mode Orthophoto, blending mode Mosaic, texture size 8192
  4. Then I exported as orthophoto with blending mode Mosaic, enable color correction off

How can I generate a true orthophoto from this, what I did wrong here?

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    What is your question? What precise steps did you perform and where did what you observed start not to match what you expected? – PolyGeo Jan 18 '16 at 8:58
  • How can i generate a true orthophoto from this application, how should i configure those and what is the workflow? – Shefqet LULJA Jan 18 '16 at 8:59
  • Please use the edit button beneath your question to revise it with any requested clarifications. Potential answerers may or may not read a trail of comments before moving on to look at the next question they might be able to answer. – PolyGeo Jan 18 '16 at 9:02
  • Is your question how to improve the results? – wittich Jan 18 '16 at 11:11
  • Its how can i generate a true orthophono not with deformed objects and roofs in other cases, i need them to be sharped like the original photo taken – Shefqet LULJA Jan 18 '16 at 11:57
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While I understand it is about pricing and the cost but have you looked at it here http://www.ips-match.com/
I myself have not tried this since I only use ERDAS or ENVI.

You can try and google "Orthophotos software" and it came up a few software that might be free or commerical.

One thing I attend ERSI's Dronemap and really nice program they had and you would need the pictures and it will take care of your orthophotos...

http://www.esri.com/products/drone2map

Check this out https://dronemapper.com/

and what software are you using when you are trying to perform surveying tool ?

  • 1
    As i understood from this process, because now i have more experience :) is that it needs to do some manually work with mosaic editor and to choose the right planar images from certain area. As i see image overlapping is not enough and it doesn't have enough information to generate a correct orthophoto. – Shefqet LULJA Apr 29 '16 at 21:59
  • and sometimes there are enough photos to create a point cloud but not enough for an orthophoto, the point clouds are usually pretty good, but then the software kind of stretches your raw images over the point using little bits from each. Also trees are very difficult and sometimes need a higher flying height to get optimal results due to parallax errors. – gomapping Sep 26 '16 at 20:06

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