Understanding GCPs

WebODM
#1

Having trouble understanding how to process images using ground control points.

We captured our points using a Timble GPS, exported in this format:

gcp001 "38°15’29.24209"“S” "145°34’53.04160"“E” 23.547

I have converted them in to this format in a gcp_list.txt file:

+proj=utm +zone=55 +south +ellps=WGS84 +datum=WGS84 +units=m +no_defs
gcp001 -38.2581228 145.5814004 23.547
gcp002 -38.262458 145.5882198 21.77
gcp003 -38.2636641 145.5848565 22.012
gcp004 -38.2606847 145.5831014 25.804
gcp005 -38.2580601 145.5815491 25.73
gcp006 -38.2578344 145.5845605 26.248

When I try to process the job I get this error:

raise RuntimeError(“This GCP file does not have any entries. Are the entries entered in the proper format?”)
RuntimeError: This GCP file does not have any entries. Are the entries entered in the proper format?

Any help would be greatly appreciated. Thanks

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#2

https://docs.opendronemap.org/gcp/#gcp-file-format

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#3

Welcome!

Sorry you were having issues generating the GCP, but as Piero linked you to, there is a specific format specification, and the output from the Trimble (and what you posted above) do not meet it.

Let us know how you get on with following the documentation.

I can always validate it for you in GCP Editor Pro to help guide you and pick out any issues they may have.

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#4

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