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Topics - c-r-o-n-o-s

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Bug Reports / Video Import fail 1.7.3
« on: May 21, 2021, 10:29:04 AM »

How exactly should the video import with subtitles work?
When importing a video from the DJI M300, I get an error message:

"invalid stoi argument"


When deleting the SRT file, the error no longer occurs.

General / New PC system and scaling of performance
« on: May 04, 2021, 03:42:12 PM »

It's about a new computer system for our work.
Which computer configuration is "good" is asked every few months.
I now simply trust the site, among others.

Two things.

We have an offer for a very expensive (5 digit) workstation (with AMD TR 3970X processor, 256GB Ram and Quatro RTX6000 graphics card).
However, some of our projects can easily be divided into chunks.
If we would buy 3 single "super" computers for the same price of this workstation, we would "really" be 3 times faster, right?
(11900k, 128GB Ram, RTX3070/3080)

Does Metashape really scale that badly to larger computer systems?
Putget suggests so.

An 8CORE Intel 11900k is faster than a Threadripper system?
An RTX3070 is only 5% slower than an RTX3090?

You'd think Metashape would be good at dividing into tasks and distributing them across CPU cores.

Feature Requests / Question about the "job organiser"
« on: May 02, 2021, 12:24:33 PM »

I still have problems understanding the "Job Manager".
The arrow keys to move the priority have no effect on me.
Regardless of whether the current job is paused or not, I cannot move the "underlying" job forward.

A calculation that I start and then put in the background ends up under "Jobs".
Now I can open another project and work in it.
All changes (even just assigning new photos) now also end up in the job manager as a subordinate job.

Unfortunately, I can't change the order there with the arrows.
Even if I pause the first job, I can't get the subordinate job up or started.

Is this the right way?
It would be more flexible if I could briefly interrupt the "long two-day" job to do short calculations on the next one.

Ok, I think I have mentioned this before.

When merging point clouds with multiple classifications, those are deleted.
(Or also merged).

The merged point cloud only has the classification: "Never classified"

Can this please be changed!?


During a normal drone flight, it often happens that the GNSS correction fails for a short time.
Then the DJI RTK drones save these inaccuracies as values.
So far, this did not worry me, because these data are included in a compensation by Metashape.
And so far I have been able to really reproduce it.
Images with very poor positioning quality didn't have much influence on the result.

Now I noticed the following:
In the attached image I sorted the approx. 1200 pictures according to calculated accuracy.
I noticed that this deviates in some cases very much from the saved "DJI" accuracy. (See marked line)
If I deselect these images as reference, the result to my GCP is much better.

The stored values within the drone do not always seem to be correct. (Or with a certain time offset.)

Metashape should offer the possibility to take over the calculated accuracy.
At the moment I test this via "reference export" and immediate "reference import" with exchange of the DJI values against the calculated ones.

Do you have any experience so far?

Feature Requests / Edit thin pointcloud
« on: April 19, 2021, 09:41:22 AM »

I often need more flexible processing from the thin point cloud.
You can export it, but you can't import it as a thin point cloud.
Also, you can't crop the thin point cloud "by boundary shape".

Why do I need this?
I have a lot of images and a very "wide" thin point cloud.
But I only want to calculate a certain section of it as a dense point cloud.
The boundary itself can then only be set as a rectangle.
Or I have to select and delete "manually" in the thin point cloud.

I think that if you can crop the dense point cloud according to the boundary shape, this should also be possible with the thin point cloud...!


General / Processing "dewarped" P4 RTK images....
« on: April 16, 2021, 10:30:19 AM »

My software for the DJI P4 RTK drone has a disadvantage.
Photos taken manually are lens corrected by default. (dewarp)
I have also turned this off on 4 from 5 jobs.
I forgot to do it on the last job.

Now I have a chunk of about 1000 "correct undewarped" photos and 100 photos that unfortunately don't fit (dewarped).
The correction parameters are saved in each image and also read out by Metashape.

Can't Metashape take these values to create uncorrected versions for me again or include them in the calculation?

Thank you!

General / Technical question about the Rollingshutter correction
« on: April 10, 2021, 12:38:00 PM »

I have a question about processing videos.
My "camera" has a hybrid shutter.
The normal photos that I load into Metashape are seen as with a globalshutter.
For videos the rollingshutter method is used.

When importing video frames all Exif data is lost. (Or are not present in the video at all).

Does Metashape not need the exposure times of the photos for the "rolling shutter" correction?
(Or can I improve the correction by adding the exposure times manually?)

Thank you!


Bug Reports / Merge & classification problem...
« on: January 27, 2021, 11:57:17 PM »

When I merge 2 classified point clouds, unfortunately all classifications are merged to one layer.
I have observed this problem in 1.6.5 & 1.7.

Surely this can be solved?


General / Point import very different in processing time...
« on: January 06, 2021, 12:22:15 AM »

I have several LAS files here.
If I import them as "Local coordinate system" the import is VERY fast.
Unfortunately, you can`t switch to the "correct" system after import.

If I load the file directly with the correct specification of the system, the import takes longer than average.
So long that it is impractical.

Is there not another way for the import?

General / Interpolation for Geoid GeoTif?
« on: December 18, 2020, 04:37:49 PM »

Does anyone know exactly how the Geotiffs are interpolated for the Vertical Elevation Correction?

I have a geotiff for geoid undulation with a resolution of "only" 310*284 pixels.
(It extends over several hundred kilometers).

In my survey program it says that there bilinear is interpolated in between.

How does Metashape interpolate here?

General / Crop a DEM or Orthophoto
« on: December 02, 2020, 10:01:31 PM »

Is there a way I can crop a DEM or Orthophoto?
Something like how I can select and delete a point cloud?

I want to delete ugly and unnecessary border areas.

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