[OpenDroneMap-users] GCPs and Georeferencing

[Alex Mandel]

Yes from Stephen's talk today, the orthophoto does not come out
georeferenced yet. You have to georeference the result (Mapknitter or
QGIS are good options).

It's on the todo list.

Thanks,
Alex

On 03/11/2015 08:22 AM, Dennis Baldwin wrote:
> Alex,
> 
> Thanks for following up.
> 
> Yes the orthophoto looks really good. You can see it here:
> 
> https://www.dropbox.com/s/42csbbk0dklskmp/odm_orthphoto.png?dl=0
> 
> and here are my GCPs for reference:
> 
> https://www.dropbox.com/s/e4cb7iuwfxc2ysm/gcp_list.txt?dl=0
> 
> Let me know if I can provide any additional info and enjoy the conference.
> Wish I could have made it out!
> 
> Dennis
> 
> On Wed, Mar 11, 2015 at 12:42 AM, Alex Mandel <tech_dev at wildintellect.com>
> wrote:
> 
>> 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
>>
> 


-- 
Alex Mandel
http://wildintellect.com