Messages

16

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?

17

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.

Thanks.

18

General / Re: Different Focal Length and Different Rotation of Camera - FORBIDDEN

« on: June 25, 2020, 01:54:00 PM »

I haven't noticed any problem with slightly different focal lengths. A mix of 24, 25, 26mm focal lengths has worked fine for me. It may depend how detailed and precise the result needs to be.

19

General / Re: stitching

« on: June 08, 2020, 02:01:00 PM »

I have used this free software. https://www.microsoft.com/en-us/research/product/computational-photography-applications/image-composite-editor/
It does not use any EXIF or GPS related data, so you won't get an orthographically correct image.

20

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 frame.zip 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.

21

General / Re: Manual alignment - how?

« on: October 31, 2019, 04:50:49 AM »

Have tried that with 3,4,5, & 6 points selected on one aligned photo and the next (non-aligned) photo. No luck. Perhaps it is because this pair only has about a 40% overlap. I will resort to some single-photo orthorectifications (in another program) to finish this job.

22

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?

23

General / Re: Dense cloud network bandwidth utilization

« on: September 17, 2019, 03:39:23 AM »

I have used 'Process Lasso Pro' https://bitsum.com/?inproduct to control resource usage of processes. I see there is an option to control 'I/O priority' so perhaps setting that to 'Very Low' would work.

24

General / Re: Fast orthomosaic without build Dense cloud?

« on: September 14, 2019, 12:17:39 PM »

Is this from overlapping aerial photos? If the ground is relatively flat, use 'Image Composite Editor' a free image stitching program for Windows. www.microsoft.com/en-us/download/details.aspx?id=52459  You will then have to georeference the final image in a mapping program.

25

General / Re: View errors - orders of magnitude changed?

« on: September 09, 2019, 07:15:04 AM »

I have never entered or changed the precision/accuracy of my GCPs. Perhaps I should.
That doesn't explain why my errors have changed to about 100x smaller. Only the Metashape version has changed.

I have changed the precision to 5m for the points I kept. That looks more like it used to be.
Is there somewhere that I can set a default precision? (It is likely to be similar for all projects).

26

General / Re: View errors - orders of magnitude changed?

« on: September 09, 2019, 02:48:43 AM »

Here is a small old (July 2017) model which would have had errors of more than 1 or 2m per point.
https://www.dropbox.com/s/1au553kwmpabq1f/Waihora.psz?dl=0

Thanks
Ross Nixon

27

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?

28

General / Re: GCP Pinning - Photogrammetry mapping

« on: September 04, 2019, 07:27:26 AM »

I can't say I've noticed that problem. I pin a marker to a GCP  in two adjacent photos. Then I do that for two more markers. Then I do Update & Optimize Alignment. I guess it depends how close "reasonably close" is to you. Come to think of it, you might be correct - I recall some showing up further away than I expected.

29

General / Re: The most effective way to make a scan from many photos?

« on: June 30, 2019, 03:33:43 AM »

Your question is strange. What do you mean by make a scan? Do you mean produce an orthophoto?

30

General / Re: jpg + jgw

« on: May 04, 2019, 10:22:59 AM »

The fact that there is a .jgw (world file) means it is georeferenced and rotated to north in a particular projection.
Open the .jgw file with NotePad.
You will see the (ground) size of each pixel in metres.
You will see the X-Y coordinates from the middle of  the top-left pixel. The will be from one of the UTM projections.