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Topics - rossnixon

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Bug Reports / Import ortho error message
« on: November 01, 2022, 01:58:01 AM »
When I try to import a large GeoTIFF, after I choose the coordinate system, I get this message.
Image was 32586 x 35190 pixels, and saved with the YCbCr color model.

"Error: Empty Frame Path"
I tried in versions 1.6.5 and 1.8.4

General / Sample PSX sub file please
« on: September 01, 2022, 02:27:06 AM »
I accidentally saved a new empty project over a PSX file I was working on, so now my project won't open.
My processing had completed to the end of creating a Dense Cloud, and I see that is there inside the MyProject.files\0\0\dense_cloud\

I have restored all the other necessary files from a backup.
The project now opens and I can see photos, sparse cloud, markers etc, but I can't see the Dense Cloud.
The Dense Cloud was created after my last backup.

What text do I need to add into one of the files so that the project can see the Dense Cloud file?

[Update 2 - solved]
Looks like I've fixed it. Crossing my fingers.
I put extra stuff (<covariance>... from another project into
Putting the following into was the final fix.
<dense_cloud id="0" path="dense_cloud/"/>

Agisoft Cloud / Agisoft Cloud failure
« on: December 10, 2020, 04:19:26 AM »
So I was merging two chunks on Agisoft Cloud and this is the email I received.

processing failed :(
We are sorry to tell you that an error occurred while processing your project.
Please try again!

No hints as to what went wrong!
Unfortunately there is no log file accessible that I could see.

When I sync it back to my PC, I see this in the log - perhaps helpful?
Error: Empty pairs list

Hold that thought:
Looks like I missed a step. Have to align chunks before I merge them. Perhaps a warning would have helped?

General / glDrawElements - out of memory
« on: December 08, 2020, 03:58:47 AM »
I created a high quality mesh on Agisoft Cloud.
When I open my project, the files download successfully, but then I get a large number of out of memory errors, such as
renderer_qgl.cpp line 616: glDrawElements(encodePrimitiveType(type), (GLsizei) countElements(type, chunk), encodeFormat(iformat), (GLvoid *) ((char *) indices + offset)) failed: Out of memory

Is this just a display/rendering error/limitation?
Can I still proceed to use the files, or have I lost data?


General / Merging two .psx files
« on: December 07, 2020, 03:49:16 AM »
I see that I can use FILE > APPEND to merge two .psx files.

Can that be done at almost any stage? I'm going to create the two meshes first, as this is memory intensive. Then merge the models. Then create orthophoto tiles after that.

My reason is so there are no image glitches in the overlap area of the two models.
Good idea? No problems likely?


General / Cloud processing limits
« on: November 29, 2020, 03:56:59 AM »
I have a project with about 116GB of aerial photos. After trying to upload to the Cloud, I discovered there is a 50GB limit. Should I divide them up into about three slightly overlapping areas? I'm only needing orthophoto tiles as final output. Would I just save the mesh from each of the three runs and then continue the process from my underpowered old PC?

General / Minimum percent overlap
« on: September 08, 2020, 01:21:08 AM »
I understand that a 60% or higher overlap is required for aerial photos in a run.
If there are several parallel runs, what is the minimum percent overlap with the adjacent runs?
These will all need to align in Metashape and be processed in one chunk.


Bug Reports / Photo path not saved correctly
« on: December 30, 2019, 05:51:12 AM »
Something to be aware of. Not sure but this may be a recent bug with Version 1.5.5 build 9097 (64 bit).

I had my photos masked and aligned. I saved the project. When I imported my GCPs, all the photos disappeared.
I am using the Windows 'File History' option, so was able to get a good previous file restored. I could then see what happened.
The project was saved on a network PC (UNC path). My photo folder is on my local PC. Metashape had saved the path as if that folder was local.
Search and replaced the photo paths with the UNC folder name. Project now opens correctly.

General / Manual alignment - how?
« on: October 29, 2019, 05:04:12 AM »
Could I have a step-by step procedure for manual alignment please?

Most of my (aerial) photos have aligned.
I have placed 3 points on one unaligned photo. Then placed the same points on the next unaligned photo. I select these two photos, reset and align selected photos. Nothing shows in the aligned column. What else do I need to do?

General / View errors - orders of magnitude changed?
« on: September 06, 2019, 08:10:21 AM »
Within the last few months, a new version of MetaShape has been showing me errors in my project which are perhaps(?) 100x smaller than usual.

 I have opened some old PSZ files to check and these also have the unusually small errors. I am typically getting errors of 0.004m, whereas I would normally expect around 1-4m.

This is for aerial models. Sorry but I didn't record the date or version when this occurred.
Has anyone else seen a large reduction in their errors?

General / Alignment problem - 1.5.2 build 7838
« on: April 04, 2019, 03:39:43 AM »
I have four parallel overlapping runs of (vertical) aerial photography.

Using Generic Preselection, I can only align the first two runs, no matter what other settings I use.

If I disable Generic Preselection, I can only align the OTHER two runs.

I have saved these as two separate PSX files.

Is there some way to merge the two jobs? Or should I just process them separately?
The only requirement is an orthophoto. Do not need an accurate DEM.

Have other people had alignment problems with version 1.5.2?
Should I install version 1.4 as a parallel installation and try with that?

General / Quick and dirty mosaicking - possible?
« on: December 24, 2018, 05:45:48 AM »
Is it possible to create a 'quick & dirty' mosaic from hundreds of well-overlapped aerial images (GPS data is in images)?
The land is mostly quite flat.
Don't need georeferenced output.
Don't need any height info.


General / Balancing dense cloud specs vs mesh specs
« on: August 17, 2018, 06:32:46 AM »
I was producing an orthophoto from about 260 aerial photos.
I ran out of memory creating the mesh from the dense cloud.
I lowered the mesh face count down to low (2.7 million), but still ran out of memory.
Then I disabled interpolation. This then worked.

1. What is the effective of disabling interpolation?
2(a). Should I have used Medium Quality, instead of High when building the dense cloud?
2(b). Would that affect how many faces the mesh could have?
2(c). If so, could I (somehow) thin down the dense cloud a certain amount?
3. What does Calculate vertex colors do; and does this take much memory?

General / Optimize camera alignment creates larger errors
« on: March 01, 2018, 06:14:52 AM »
Project is to make an orthophoto from DJI photos of a forest.
I aligned photos using the Reference option (longitude/latitude in EXIF).
To get all photos to align, I had to set Key Pt & Tie Pt options to 0.
I have 16 good precision GCPs, although I removed "8" as it had the biggest error.
A few photos had markers that I couldn't position due to tree lean/displacement, so I left those with grey symbol.

When I do Optimize Camera Alignment, my sparse cloud goes crazy, and my x,y,z errors get much worse. (The dialog box showed all options checked except Fit p3, Fit p4, rolling shutter.)

I have settled for creating the orthophoto without doing the optimize. It's not perfect, but still useable.
(Before optimize & after optimize (angled to show problem) images of sparse cloud are attached).

General / Photo rotation before or after alignment?
« on: February 16, 2018, 07:53:14 AM »
I have many aerial photos. About half of them were taken at 180 degrees from the others.
The align photos process completed with everything aligned correctly.

But now I'm having trouble positioning my control points, so are having to rotate the photos inside Photoscan.
I think I will be able to get my errors down to acceptable levels. I haven't finished yet though.

Do I need to repeat the align photos process after this? I'm wondering if my tie point cloud is faulty and misleading, and will affect the final orthomosaic.

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