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Messages - aaronjameslewis

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1
Bug Reports / "Null point cloud" error when building orthomosaic, v. 1.2.6
« on: November 30, 2016, 12:03:05 AM »
Dear Agisoft,

I am attempting to build and export orthomosaics in v. 1.2.6 using an imported mesh (.obj) and cameras (.xml) from a previously created model. I am able to successfully import and align cameras as well as the mesh, and to texture my new model using this imported data.

However, when I proceed forward to the "build orthomosaic" workflow step and select mesh as my surface, the program does not recognize the native resolution derived from my imported mesh, instead displaying a pixel size of 0 m. When I try to build the orthomosaic the program then reads an error message ("Null point cloud") and does not proceed forward...

Is this error the result of a bug in the newer version? To my understanding, the orthomosaic is projected onto the chosen surface (in this case, the .obj model), and thus there should be no use of point cloud data during this processing step. In addition, I have had zero problems exporting orthophotos in v. 1.1 with no point cloud information, simply by importing my cameras and .obj model, re-texturizing, and then exporting as a GeoTIFF.

Any help or advice on this matter would be greatly appreciated!!!

Thanks,
Aaron

2
General / Rotating a georeferenced model
« on: June 09, 2016, 12:43:53 AM »
Hey everyone,

I am currently working with Photoscan to build digital elevation models of ground surface features for use in geospatial analyses. I have a current model that looks to be correctly georeferenced in WGS '84 coordinates using the GPS coordinates collected by the camera during acquisitions, but Agisoft appears to have solved for the chunk rotation incorrectly such that the model is flipped on its side.

Specifically, my model appears to have been rotated ~90 degrees counter-clockwise about the Y-axis from where it should be, such that the "top" of the model is facing in the (-x) direction instead of the (+z) (see attachment). As a result, when I try to export an orthorectified GeoTIFF of the model, it is completely distorted.

Is there a way to manually rotate my georeferenced model so it aligns properly in a WGS '84 coordinate system? I know the "Rotate Object" function performs this task for unreferenced models, but this will not work in my case because I need to properly georeference the data for our our analyses. I have also tried manually applying rotations to the existing 3x3 chunk transform in the cameras XML file, but this method is not working for me either.

Any help would be greatly appreciated!!


Thanks,
Aaron


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