topic Re: Can I not mix coordinate systems in Drone2Map? in ArcGIS Drone2Map Questions

Can I not mix coordinate systems in Drone2Map?

PaulHuffman — Thu, 29 Nov 2018 00:57:06 GMT

I am using Drone2Map 1.3.2. I have a collection of photos that were collected with a drone flight that are in WGS 84. I ran them without the ground control points and got some nice looking mosaics and surfaces. Then I tried another Drone2Map project with the same photos, and this time tried to add the ground control points provided in a CSV. They are in Washington StatePlane South. They map in Arc Map correctly as Washington State Plane South. Drone2Map import GCPs into project seems
to get the understand the horizontal coordinate system, and the Sample Record seems to show that the CVS fields were read in correctly. Dropbox - gcp.PNG But I can only get "There are no GCPs that fall within the project area. Please Check your spatial reference and verify your latitude and longitude are correct. " What did I miss? Do I need to convert the GCPs to WSG 84?

I brought the State Plane CSV points into Arcmap as XY events, reprojected them to WGS 84, ran the AddXY tool on them, exported them back to CSV, and then imported the GCPs back into D2M. The field mappings had to be adjusted a little to use the new WGS 84 field mappings, but the points imported fine. Created my links and I'm currently running this again to see how much the control points help the products.

Re: Can I not mix coordinate systems in Drone2Map?

PaulHuffman — Fri, 14 Dec 2018 17:51:52 GMT

ESRI Technical support told me that having a different coordinate system for the ground control points just doesn't work. D2M is unable to reproject GCPs on the fly. That I should use my workaround workflow of changing the projection of the GCPs. But it seems strange that the product would have the user set the projection system for the photos in one area of the workflow, then have a way to define the projection system of the ground control points in another part of the workflow if it doesn't work.

Tech support pointed me to bug ENH-000103747, but this enhancement request doesn't match well to what I am experiencing. The bug description is "

In Drone2Map, For gcp that use a different Datum than the Drone imagery, the Software should indicate, in documentation or in the product as a message, what datum transformation is being applied and/or allow this to be applied to the processing results as well."

Re: Can I not mix coordinate systems in Drone2Map?

CodyBenkelman — Mon, 17 Dec 2018 19:32:26 GMT

Paul

Sorry for the delay in my response - I missed your original post. You *should* be able to use GCPs in state plane coordinates; there must be some other cause for this problem. Can you send us your processing report?

Cody B.

Re: Can I not mix coordinate systems in Drone2Map?

PaulHuffman — Mon, 17 Dec 2018 21:17:52 GMT

It looks like I don't have a processing report for this run. The report folder just has a folder html with the esri logo in it. I think that would be consistent with just stopping the project when I encountered the message that there were no control points in the project area. Would the report for the run in which I used reprojected coordinates be helpful?

Re: Can I not mix coordinate systems in Drone2Map?

PaulHuffman — Fri, 21 Dec 2018 19:25:32 GMT

I figured out that transformation on the fly does work in Drone2Map. I had just been trying to use the wrong input coordinate system for the GCPs. Drone2Map presents a lot of different kinds of NAD 1983 Washington State Plane South, and, unlike my ArcMap, none are saved to "favorites". NAD 83 Washington State Plane South 102349 sends the GCPs out of the project area. NAD 83 Washington State Plane South Feet 2927 places the GCPs correctly.

Re: Can I not mix coordinate systems in Drone2Map?

MarkétaSoučková — Wed, 12 May 2021 14:39:52 GMT

Hi there,
I have similar question.
I'm trying to import GCPs into Drone2map version 2.3.
Images from the drone are in WGS 84 so I left all the project in this coordinate system.
Now I would like to improve project accuracy by GCPs, however according to this procedure:

I can not click on "OK". What might be the problem please?
I can have GCPs either in national geographic system - "JTSK Krovak East North" or WGS.
I tried to import both but without a success.
I am looking forward for any suggestions.

Re: Can I not mix coordinate systems in Drone2Map?

JEngvall — Tue, 19 Nov 2024 19:06:01 GMT

I'm having the same issue. The photos is reprojected fine but the control points does not work: "No control could be imported into your project. Please check that the control you are trying to import is in the correct spatial reference and the control is within the project area." The control points are the same coordinate system as the project but still does not work.

Re: Can I not mix coordinate systems in Drone2Map?

MarkBarker1 — Thu, 21 Nov 2024 17:47:35 GMT

Hi @JEngvall,

This is a pretty old post so the way we handle coordinate systems from that version has changed a bit. When importing control we do a validation of the X/Y (lat/long) fields to make sure that the points appear over the flight area. Do you happen to have points that are far away from the flight path? If so, then they might be causing the problem.

I would also double check that the field mappings didn't get swapped for latitude and longitude as sometimes the table formatting, especially tables without headers, can cause the automated field detection to not match properly.

If you continue to have trouble importing your control, then please share the image coordinate system you are using and the one you are defining for the control.

Regards,

Mark