[OpenDroneMap-users] GCPs and Georeferencing

[Alex Mandel]

On 03/10/2015 02:08 PM, Dennis Baldwin wrote:
> Hi,
> 
> I've been working on a list of GCPs that I can patch out to the Caliterra
> sample data set. Before I submit the patch I wanted to do some testing so I
> just ran them through ODM. Everything finished cleanly and I see the
> following file in the odm_texturing folder:
> 
> odm_textured_model_geo.obj
> 
> I can open it in Meshlab and it's nicely stitched together. My question is
> how can I verify that it's properly georeferenced? I looked in the
> "Reference scene" menu but it's empty. I also noticed there is an
> odm_orthphoto.png file in the results folder, but running gdalinfo doesn't
> yield any coordinate reference system. I'm wondering if my GCPs are messed
> up or if I'm overlooking something with the results.
> 
> My goal is to generate a geotiff and then run it through gdal2tiles so I
> can create a nice web map like I can with Pix4D, but exponentially cheaper
> :)
> 
> Hooray ODM!
> 
> Thanks,
> Dennis
> 
>

Dennis,

I asked Stephen the same question today at http://foss4g-na.org

The odm_orthophoto.png is supposed to be it. I'll check with Stephen
tomorrow but if we aren't writing to the png header (not even sure
that's possible) then we'll work on a pngw file to go with it that has
the geo information (or more ideally a geotiff).

Is your orthophoto.png viewable in an image viewer? The test one from
the copr data I did came out as a junk file so we were debugging that
today to see about the next steps.

The other path we looked at today was obj->collada->gltf->Cesium (3d
globe). That didn't seem to work either but that appears to be an obj to
collada conversion error.

Thanks,
Alex