topic Re: Data process from recap is not align for rcp and orthophoto tiff in ReCap Forum

Data process from recap is not align for rcp and orthophoto tiff

hafiz.azman — Fri, 27 Mar 2020 10:23:11 GMT

Hi, first of all I am not sure to post this in Recap, Civil 3d or naviswork category because all have similar problem. I have process my drone mapping image (Mavic 2 Pro) that has been flight using drone deploy but we dont set any GCP. During the process in recap, I use the local coordinate system which is GDM2000 (ignore the typo in recap) and process all 3 rcp, orthophoto and also report.

After done with the process, I try to import the rcp point cloud and also the orthophoto into civil 3D and naviswork, but both give the same result. Below is the workflow i've done in civil 3D. I use the same projection which is GDM2000. Please help and let me know what do i miss?? If GCP is the problem, why does the orthophoto is at the correct location?

Re: Data process from recap is not align for rcp and orthophoto tiff

Pointdump — Fri, 27 Mar 2020 15:21:05 GMT

Hafiz,
"...we dont set any GCP."
So how did you geo-reference?
"...the orthophoto is at the correct location..."
It doesn't look right to me. Doesn't match Bing Live Maps.
"...the local coordinate system which is GDM2000..."
I couldn't find "GDM2009_Selangor" Coordinate System. Is it a Custom Projection?
Dave

Re: Data process from recap is not align for rcp and orthophoto tiff

georg.grebenyuk — Fri, 27 Mar 2020 15:21:53 GMT

Hafiz,

Welcome to Autodesk ReCap Forum!

Can you clarify, where your origin-point of ReCap's project? Pressed to "Update Origin" in settings, you also can assign here your "base point". I affraid that first photo had "base point" on one of angle - and if ReCap's model have Origin-point in other place - you can got that result in your Case

Re: Data process from recap is not align for rcp and orthophoto tiff

hafiz.azman — Mon, 30 Mar 2020 02:06:10 GMT

Hi Dave,

"...we dont set any GCP."
So how did you geo-reference?

We just use the gps coordinate provided by the drone

"...the orthophoto is at the correct location..."
It doesn't look right to me. Doesn't match Bing Live Maps.

It is at the correct location as BING map is older image and this area has a lot has been done recently. below is the image from google map and C3D bing for you reference.

Image from google map on the site:

Image from google map

Image from C3D with orthophoto:

Orthophoto in C3D

"...the local coordinate system which is GDM2000..."
I couldn't find "GDM2009_Selangor" Coordinate System. Is it a Custom Projection?

I am not sure why it is writen GDM2009, but it is suppose to be GDM2000 as i got the template from one of our surveyor. GDM 2000 is being use in Malaysia and it is not by default available in C3D. Attached with this is the GDM2000 template file.

The main issue I dont understand is that both orthophoto and point cloud is the output from recap photo which i processed it once. Below is the setting that I use to process in recap photo which I've tick all 3 output, RCM, RCP, and Geotiff and use the GDM2000:

Regards,

Hafiz

Re: Data process from recap is not align for rcp and orthophoto tiff

hafiz.azman — Mon, 30 Mar 2020 02:13:51 GMT

Hi Egor,

I am not sure how to check origin point, but by clicking update origin, the point is 0,0,0. Am i doing it right?

Regards,

Hafiz

Re: Data process from recap is not align for rcp and orthophoto tiff

georg.grebenyuk — Mon, 30 Mar 2020 08:31:42 GMT

Haviz,

Look on my video

I also have drawing in Civil 3D, coordinate system = UTM-36N, I want insert to drawing Raster Image in LL-84 coordinates and ReCap's model (that in UTM-36N coordinates already). Function "Angle" working no at rotate image - it rotate model from "0,0,0". You can see in my video that I tried type value of angle - and got situation that my model is shifted overly far from Raster image.

In your Case as I understand, model was created in "conditional" coordinates from zero is somewhere on surveying area. BUT you have an inaccuracy, because that "Base point/project's zero" don't equal zero of raster image. Optionally, center of photo is "image's base point" and you need to change point location in ReCap to that position. You can press on "Preview" button to display current location of ReCap's base point

May be it info help you to solve problem.