Messages

1

General / Re: Nadir Photographs Aligning at Two Separate Elevations / Oblique Fine

« on: March 19, 2025, 09:58:04 PM »

Alexey,
Thank you for all of you input and help.  We are going to give this a test and see if this is something we could have accidently done.

CB

2

General / Re: Nadir Photographs Aligning at Two Separate Elevations / Oblique Fine

« on: March 18, 2025, 09:53:05 PM »

I am grabbing original photos from UAV SD micro card.

The PPK process does not change anything about the digital photographs.  They are not touched or changed during this process.

3

General / Re: Nadir Photographs Aligning at Two Separate Elevations / Oblique Fine

« on: March 18, 2025, 08:21:33 PM »

Alexey,
Wow! many thanks.  I did the same investigation you did and see the same image sampling distance you noted. 

We are positive that the UAV flew at a very consistent altitude and can prove that through PPK processing.

Additionally strange, the camera used has no zoom function and the UAV was flying an autonomous preprogrammed course.

yet, what you have described is exactly what the photographs show.  We aren't sure how it happened.  Clueless and have never had this happen before.

Thank you again.

4

General / Re: Nadir Photographs Aligning at Two Separate Elevations / Oblique Fine

« on: March 17, 2025, 08:59:31 PM »

Hi.  I am pretty sure we did enable them.  The first processing is without the PPK and I think that is what the export reference came from.

The delta of 130 feet is because of the difference between autonomous flight based on latitude, longitude and ellipsoid height, versus, northing, easting and orthometric height elevations (ellipsoid height minus geoid height).  But it is a pretty much constant delta between the autonomous altitude and PPK elevation.

I am not sure about sharing all the images, I am truly appreciative of your offer.  I need to wait to hear more from metashape.
CB

5

General / Re: Nadir Photographs Aligning at Two Separate Elevations / Oblique Fine

« on: March 17, 2025, 07:44:39 PM »

Here is the reference export and the PPK results.

Thank you.  Let me know what else you might need.

6

General / Re: Nadir Photographs Aligning at Two Separate Elevations / Oblique Fine

« on: March 17, 2025, 07:14:53 PM »

Thank you.  Will do.  I am working on that now.

7

General / Re: Nadir Photographs Aligning at Two Separate Elevations / Oblique Fine

« on: March 11, 2025, 09:32:08 PM »

Hi Paulo,
Thank you for offering to look at this.  What do you need exactly? 

I can send you the PPK coordinates, that is easy.

What do you mean by exporting the reference cameras with all ticks?

8

General / Nadir Photographs Aligning at Two Separate Elevations / Oblique Fine

« on: March 11, 2025, 07:27:19 PM »

Hello, and thank you ahead of time for the help.

We have a project that we flew approximately 60 photographs in a nadir camera orientation and 60 photographs with a 78 degree oblique camera orientation.  We used PPK to control the camera location at the time of photograph capture and all camera positions where within 6 feet elevation of each other according to the PPK results.

After importing the photographs, converting the camera positions to California State Plane Zone 5 coordinates and importing the source position PPK control file, we aligned the photographs and this is where things got weird.

All of the oblique and a portion of the nadir (about 2/3) aligned to the same elevation as the PPK source, with a portion of the nadir (about 1/3) aligned at a much lower elevation (about 50 feet lower).

More details:

For the nadir flight the first two flight lines aligned at the same elevation as the PPK coordinates and the oblique aligned camera positions.  This is the first 1 - 18 photographs.  Photograph number 19 is at the turn to the third flight line and it is about halfway in elevation between photograph 18 position and photograph 20 position.  After and including photograph 20 the remaining nadir photographs (20 - 57) are at an aligned elevation approximately 50 lower than the first 18 nadir and all the oblique camera positions.

If I process just the nadir by themselves, the weirdest thing happens, the nadir camera positions align to a coordinate position that is lower in elevation than the sparse point cloud point elevations.  As if the UAV was flying upside down inside some tunnel and was capturing photographs above the UAV or on the "ceiling" of land above it.  Which of course is not the case.

I am attaching two screen grabs, one showing the nadir and oblique aligned camera positions and one screen grab showing the nadir only camera positions.  I am also attaching a reduced resolution aerial ortho mosaic I was able to complete using the oblique images.

I appreciate any help that you can offer.  Thank you.  I have never seen this behavior before.

9

General / Re: Point Cloud Delete Points by Confidence

« on: May 16, 2024, 01:23:03 AM »

Awesome! this didn't.  thank you.

10

General / Point Cloud Delete Points by Confidence

« on: March 21, 2024, 06:21:09 PM »

Hello,
When computing the point cloud in Metashape we have the program calculate confidence of each point.  You can then view the confidence of points in the model by color, hot colors have lower confidence and cool colors have higher confidence, i.e. red = is the lowest confidence and blue is the highest, and the order goes as the rainbow would, red, orange, yellow, green, blue.

You can then filter what is seen and selectable by that confidence and therefore delete the points of the lowest or lower confidence to begin cleaning up the point cloud noise.

The issue I am having is when I set the point cloud to display points of confidence between 0 - 4 and then select what is shown and delete, this delete process never deletes all those points, even when I have selected a window that obviously includes them all.  Even more frustrating, as I change my view point or view elevation, more points show up within the area I just deleted.  Meaning, I can never be certain I have deleted all the points that are within my chosen confidence interval.  This continues and continues until I get frustrated and give up.

Of course, I am hoping @Alexey Pasumansky  has the answer.  But I am truly hopeful for an answer from anyone. 

Thank you, Clayton

11

General / Re: Import .csv marker file

« on: March 01, 2024, 01:06:47 AM »

@Alexey

Hi, I figured out what I wasn't aware of.  Running this script creates a custom menu pull down.  I found that and ran the custom menu and get an error.

Error: list index out of range

I will continue to explore.

12

General / Re: Import .csv marker file

« on: March 01, 2024, 12:30:13 AM »

Hi Alexy,

I am testing this now.  Over a year later.  For some reason I am not reliably tracking items I post.

I tested it, and I can't get the script to request a file attachment to load for the marker assignments.  I will continue to review, but I am not sure what I am doing wrong yet.

13

General / Import .csv marker file

« on: January 12, 2023, 12:14:21 AM »

Hello,

I am looking for a way to import a simple marker file that has the following characteristics.

GCP, Image_name, x pixel, y pixel
GCP, Image_name, x pixel, y pixel
GCP, Image_name, x pixel, y pixel
GCP, Image_name, x pixel, y pixel
etc.

We have moved to Agisoft Metashape from Pix4d and have many projects that have been completed in Pix4d that we may need to revisit using Metashape.  But to have to revisit and recontrol the project in Metashape is not something we would want to do.

Pix4d has two export options for markers, one is a simple .csv file like that above, and the other is a Pix4d .xml file.

Metashape allows for a marker input by Metashape .xml, not at all by .csv.  The really confusing thing is it seems like the .xml version should be attempting a universal export that most softwares could understand.

I have found scripts for exporting a .csv formatted marker file like that above, but not for importing something similar.

Any help is appreciated.

Clayton