Need Your Experience - 2 subjects

I buy WebODM installer(windows) and a give a go with a recent small project of 68 photos(double grid/3D) and everything went well… but I got the pointcloud output in coordinates WGS84 UTM 29N
and i want that in ETRS89 / Portugal TM06 - EPSG:3763(portuguese datum).

In the process of georeferencing the images with GCP I put this information of Datum ETRS89 / Portugal TM06 - EPSG:3763 in my text file of GCP(+proj=tmerc +lat_0=39.6682583333333 +lon_0=-8.13310833333333 +k=1 +x_0=0 +y_0=0 +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs)
and later when exporting such georeferencing file (images+GCP) “gcp_file_1671071414567.txt” …i think it´s all ok because has in the heather the information from this same Datum… But all processing output are in WGS84 UTM 29N !!!

Therefore the Mesh(odm_textured_model) and others has the same georeferencing problem.

Another thing…the ortofoto *.tif generated don’t have georeferencing file, the *twf and *.prj !?.. when importing, for example to AutoCAD, I can’t automatically put it in the right place., i have to do the ALIGN command with common points.

How can I have the output generated files after processing, in the Datum I want, in this case the ETRS89 / Portugal TM06 - EPSG:3763 and have a georeferenced orthophoto?

Other thing…
In your all experience what processing settings you all use?

  1. A dense pointcloud with less noise as possible but that objects are not lost, for example poles.
  2. The best crisp ortophoto possible.
  3. The best mesh construction

I’m a topographer/surveyor and i need the best crisp ortofoto and the best pointcloud as possible, the mesh is not so importante, it’s just for visualization purposes.

Thanks in advanced.

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  1. We don’t support changing CRS arbitrarily using GCPs. The most appropriate local UTM CRS is always used during processing.

If you need different final CRSs, you’ll need to reproject the data.

The GeoTIFFs are georeferenced using Metadata, which is standard in the format.

Worldfiles are legacy, mainly ESRI, and not implemented.

“If you need different final CRSs, you’ll need to reproject the data.”
Where? For example QGIS? Is there any way, that I don’t know about, to do it in webODM?

“The GeoTIFFs are georeferenced using Metadata, which is standard in the format.”
Ok…I successfully reprojected the TIF file in QGIS and created the prj. No i can open in any CAD software.

WebODM team don’t think of implementing the possibility of choosing the CRS output?
As it exists in any other software… Pix4D, 3Dsurvey, Metashape etc…?

And about the processing settings?.. Any suggestions?


From WebODM you can export the outputs to any CRS you’d like, so long as it has an EPSG code.

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It really varies by dataset and how you collect your data, with the most important aspect being how you collect your data.

In general, however:

  1. Use ultra for --feature-quality, --pc-quality, bump --min-num-features 50% or more, try relaxing --pc-filter (disabling might introduce noise)
  2. Orthophoto is heavily impacted by PointCloud quality, so above, plus setting --orthophoto-resolution to your expected survey GSD or finer
  3. See point 1, you can try raising --mesh-octree-depth and --mesh-size but be aware these are incredibly resource intensive and have rapidly diminishing returns.
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I tried this but it didn’t work properly.




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