[OpenDroneMap-users] Tips and tricks for model re-runs

[Ivan Lizarazo]

Nice work, Steve. It's really helpful.

I ran ODM with the Langley dataset using this gcp_list.txt (taken from the
wiki):

*WGS84 UTM 10N*
*544256.7 5320919.9 5 3044 2622 img_0525.jpg*
*544157.7 5320899.2 5 4193 1552 img_0585.jpg*
*544033.4 5320876.0 5 1606 2763 img_0690.jpg*

After a while, ODM quit the georeferencing job.  This is the last part of
the odm_georeferencing_log.txt:

*Reading following GCPs from file:*
*x_: 544257 y_: 5.32092e+06 z_: 5 pixelX_: 2622 pixelY_: 3044 image:
img_0525.jpg*
*x_: 544158 y_: 5.3209e+06 z_: 5 pixelX_: 1552 pixelY_: 4193 image:
img_0585.jpg*
*x_: 544033 y_: 5.32088e+06 z_: 5 pixelX_: 2763 pixelY_: 1606 image:
img_0690.jpg*

*The calculated easting offset for the georeferenced system: 544149*
*The calculated northing offset for the georeferenced system: 5.3209e+06*

*Recalculated GCPs with offset:*
*x_: 107.7 y_: 21.9 z_: 5*
*x_: 8.7 y_: 1.2 z_: 5*
*x_: -115.6 y_: -22 z_: 5*

*Reading mesh file
/home/ivan/odm_data/langley/reconstruction-with-image-size-2400-results/odm_texturing/odm_textured_model.obj*

*Successfully loaded
/home/ivan/odm_data/langley/reconstruction-with-image-size-2400-results/odm_texturing/odm_textured_model.obj.*
*Position in model for gcp 3: x=13.1883 y=-2.29253 z=-15.2447*
*Error in Georef:*
*Less than 3 GCPs have correspondences in the generated model.*

I understand that more than 3 GCP are needed to succeed.  Do you  have more
GCP available for the  Landley dataset?

Could anybody provide a GCP list for any of the ODM sample datasets?

Best regards,

Ivan

On Sun, Mar 1, 2015 at 8:32 PM, Stephen Mather <stephen at smathermather.com>
wrote:

> Hi All,
>
> I was playing today with the Langley dataset, working on the
> georeferencing / orthophoto tests, and hadn't loaded enough (useable)
> points in my gcp file for the georeferencing / orthophoto generation.
>
> So, I added some more ground control points to odm_georeferencing_log.txt
> and wanted to rerun, but not everything. Since the latest step we can start
> from (at this time) is pmvs, here was the command I ran so that I wouldn't
> have to rerun all the matching and bundler:
>
> run.pl --resize-to 3000 --start-with pmvs
>
> It completed in 30 minutes instead of 8 hours, which was refreshingly
> short, and reran PMVS (point cloud model creation), meshing, mesh
> texturing, and orthophoto generation.
>
> Hope this helps,
> Best,
> Steve
>
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