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Author Topic: Different pixelsize in exportDem and exportOrthophoto in v1.1.0  (Read 2799 times)

ruadi

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Different pixelsize in exportDem and exportOrthophoto in v1.1.0
« on: January 09, 2015, 07:20:11 PM »
Hi,
I switch recently from 1.0.4 to 1.1, after processing the same images I got strange results (manually AND with the python-interface!):
The PDF-report shows (why is no option for an ascii-export of the report...?):

Page 2: Survey Data:
Number of images: 514
Flying altitude: 260.191 m
Ground resolution: 0.0791013 m/pix
Coverage area: 2.33455 sq km
Camera stations: 514
Tie-points: 78246
Projections: 343834
Error: 2.22708 pix

Page 4: Ground Control Points:
Total (last line):
X-Error (m):   0.007136
Y-Error (m):   0.013967
Z-Error (m):   0.022269
Error (m):      0.027238
Projections:   23
Error (pix):   0.296075

Page 6: DEM:
Resolution: 4.24915 m/pix
Point density: 0.0553855 points per sq m

The ortho was export with 7cm resolution and is looking perfectly, the DEM was exported with 4.2m and was (of course...) very coarse.
Forcing the DEM-export down to 7cm revealed, that the technical pixelsize was 7cm, but the effective level-of-detail was still 4.2m.


Alexey Pasumansky

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Re: Different pixelsize in exportDem and exportOrthophoto in v1.1.0
« Reply #1 on: January 09, 2015, 08:18:52 PM »
Hello ruadi,

And what were the Dense Cloud and Model generation parameters?
Best regards,
Alexey Pasumansky,
Agisoft LLC

ruadi

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Re: Different pixelsize in exportDem and exportOrthophoto in v1.1.0
« Reply #2 on: January 12, 2015, 10:59:09 PM »
I used

buildDenseCloud(quality=PhotoScan.HighQuality)
buildModel(surface=PhotoScan.HeightField, source=PhotoScan.DensePoints, interpolation=PhotoScan.EnabledInterpolation, face_count=PhotoScan.HighFaceCount)
buildUV(mapping=PhotoScan.OrthophotoMapping)
buildTexture(blending=PhotoScan.MosaicBlending, size=4096)