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Messages - Dieter

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61
General / TLS Laserscans - Registration incorrect
« on: March 04, 2022, 12:03:39 PM »
Dear Agisoft team, I have now tried the procedure with TLS scans and photos several times and each time I get a different result. There is now version 18, no one knows which script is correct or which one to use, no one knows exactly how I can add registered scans to an existing project without destroying the registration, all in all I can say for myself that the function "Reading in registered laser scans" DOES NOT WORK CORRECTLY.

I ask again to firmly integrate all these scripts into Metashape to make the whole thing a little more transparent.

There are now many entries here in the forum where almost all users say it doesn't work, how will the Agisoft team react to this?

For me and our office, I can say that we urgently need this function.

dieter

62
General / Re: Anwender im Ortenaukreis
« on: February 23, 2022, 11:04:39 AM »
Bin zwar nicht aus dem Orthenaukreis, kann aber mal gerne helfen wenn es nicht zu viel wird ;)

Schick mir einfach eine persönliche Nachricht.

Gruß
Dieter

63
General / Re: Combining Laser scan and point cloud data
« on: January 19, 2022, 01:17:53 PM »
<100mm  accuray for the GPS coordinates?

What Kind of GPS do you use? Normal, RTK or PPK?

What for an accuray you want to reach for the whole project?

Dieter

64
General / Re: Combining Laser scan and point cloud data
« on: January 18, 2022, 07:07:34 PM »
A few questions about it:

How accurate are the GPS coordinates of the images?
In which coordinate system should the result be delivered?
Are there identical (tapable) points between the point cloud and the images?
Does the point cloud only consist of the E57 file or are the original data (scans or photos) available?

Dieter

65
General / Re: Tiled Model UAV and Laserscanning data
« on: January 07, 2022, 07:04:05 PM »
I had the case a few weeks ago, the mausoleum was created via photos, the surroundings via scans.
If I had made another flyover now, the round shadowing under the scanner would also have disappeared;)

Dieter

66
General / Re: Dense cloud with Sky noise? How to solve?
« on: January 07, 2022, 02:24:27 PM »
Try to calculate this area using a tiled model. The results for such fragile elements are usually better than those from the orthophoto. Then take a high-resolution screenshot of the railing from the tiled model and hang it in front of the facade using Photoshop. You may have to delete the "empty" areas within the railing with a mask so that the wall behind it is visible.

There are several approaches that you have to try out a bit.

Dieter

67
General / Re: Import Laserscan data -registration lost
« on: January 06, 2022, 08:18:31 PM »
but IMHO if you use the scans with reference marked with high accuracy then I do not see the utility of quick layout script....
Some TLS scans may not get aligned at all if they do not get sufficient tie points to other scans and images.

That is exact the point!

I use Cyclone for TLS and take a lot of time looking at the data in 3D to choose my reference points as accurately as possible. I'm almost always working with buildings, so I'm looking at windows and cornices etc, to get my points correct to within a couple of mm, which is not possible currently in Metashape just by putting a marker on a depth map in '2D'.
Currently, the only practical method I've found for combining laser scans and photogrammetry with Metashape is the traditional approach of manually picking ground control points. However, that method is also time consuming, error prone, and requires jumping back and forth between multiple pieces of software. We've worked on a few Python tools to make it slightly less painful but the process is by no means as efficient as it should be.

If you take the scans and photos of the same objects (e.g. walls) and do the scan in color and choose the right exposure for the color scans, and also about the same resolution between photos and color scans, the photos are linked to the scans. It takes some practice and experience, but it works.

We often work like this, the base point cloud comes from the scans and inaccessible areas are condensed by photos.

68
General / Re: Import Laserscan data -registration lost
« on: January 06, 2022, 11:30:50 AM »
My approach:

1) Import scans
2) Quick layout script
3) Import photos
4) mark only the scans as reference with an accuracy of 0.001 meters
5) allign scans and photos

Tie points are determined in the scans and the photos and compared with each other. The coordinates of the scans are held as a reference system.

Dieter

69
General / Re: Import Laserscan data -registration lost
« on: January 05, 2022, 04:18:29 PM »
@Paulo

I've tested that again now. For me, the tie points are also searched for in the laser scans and compared with those of the photos. Of course you have to select all elements (photos and scans) for allignment. To be honest, I haven't even known the menu item you mentioned until today.

Dieter

70
General / Re: Import Laserscan data -registration lost
« on: January 05, 2022, 11:40:06 AM »
Wait a minute, if I do set the laser scans as fixed points and then do the allignment via laser scans and photos, the tie points must be generated in the scans and in the photos, or am I completely wrong? The same function also works with photos if I have RTK coordinates, what's the difference?

As I have already noticed several times here, I find it totally unfortunate to do an essential function of the program (setting the laser scans as fixed points) with an external script. I never know exactly whether the script is up-to-date or whether it still fits the new version. This function must be integrated into the main Metashape program.

71
General / Re: Import Laserscan data -registration lost
« on: January 04, 2022, 02:17:25 PM »
I assume that you have no orientation for the photos?

Then I would import the laser scans, then run the script for orientation over them in order to define the laser scans as fixed points. Then import the photos and allign them with the laser scans. With a little (a lot of) luck you will have identical points between laser scans and photos. You then have to decide whether that is accurate enough and sufficient. If that doesn't work, you only have the option of looking for identical points in the laser scans and in the photos and using them as GCP for photo matching.

Good luck with it.
Dieter

72
Bug Reports / Re: Geoid heights and tiled model
« on: October 22, 2021, 09:15:49 AM »
Thanks for the answer.

However, this does not help me, because our customers also want the correct height (geoid) in the tiled model. Is there a workaround?



Just by the way: Why is the choice of a coordinate system offered when I export the tiled model if this selection is not taken into account anyway?


Dieter

73
Bug Reports / Re: Geoid heights and tiled model
« on: October 21, 2021, 09:13:56 AM »
push

74
General / Re: Export tiled model to Cesium ion
« on: October 21, 2021, 08:59:49 AM »
"In AGISOFT I am searching how we can apply a shift in Z before uploading to CESIUM"

Or export the tiled model to tls with the right heights, not only ellepsoid heights.

+1


Dieter

75
Bug Reports / Geoid heights and tiled model
« on: September 30, 2021, 12:42:37 PM »
In Metashape 1.74, when I work with a custom fixed height geoid and then export a tiled model and don't change the coordinate system, the output is ellipsoidal heights.

lg
Dieter

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