Topics

1

General / Need help "Infinite values in transform are not allowed"

« on: May 02, 2024, 05:28:34 PM »

I am trying to import a LAZ file as a Point Cloud that was created from a LiDAR that I flew. I have re projected the LAZ file in WGS84 and I get the error message "Infinite values in transform are not allowed". Has anybody else experienced this issue and what does it mean and what do I need to do. Any assistance with this would be great.

thanks.
Rainman

2

General / No sparse point cloud after I have successfully aligned images

« on: June 06, 2022, 08:16:13 PM »

Good morning.

I have recently flown an area with a micasense dual camera. I have added all images and gone through all the reflectance calibration and then aligned successfully. However, there is no spares point cloud beneath the images, which there typically is. I then have tried to proceed and added the GCP file, de selected the images, then all that shows up at the locations of the GCP's and I am unable to identify where the GCPs appear in the images. Can anybody offer any advice. I have never seen this happen every before.

Thanks.
Ian

3

General / Exporting a Point cloud (las) into smaller size files

« on: March 15, 2022, 08:08:29 PM »

Hi.

I have a very large project and I am trying to export the Dense Point cloud into manageable size chunks/files.  When I try and export the Point file as a las file, its over 54 GB. I know on the export window there is an option to Split Box, but when I change those numbers, it makes not difference to the size of the exported las file. Is there a way to export a Point file into manageable file size chunks?

Thanks.
Ian

4

General / Generating a Dense Point cloud

« on: April 26, 2021, 10:07:48 PM »

Dear Sir/Madam.

I am using Metashape version 1.7.2.12070. I have generated an Agisoft project with a MicaSense Altum camera, I have aligned the project with no issues, I have then added a total of 15 GCP's, using the following projection, WGS 84/UTM zone 12N + EGM 2008, with minimal errors, errors (m) 0.03 and error (pix) 2.16. I then go to the next stage and generate a Dense point cloud and nothing is generated. Please see attached files. In the info file for the dense point cloud, no points are generated. I have tried generating a dense point cloud without the GCP's and a dense point cloud is generated. Please advise me and what I am doing incorrectly.

Thanks.
Ian

5

General / Can't select tile size

« on: October 20, 2020, 07:48:52 PM »

Dear Sir/Madam

I am trying to align a number of flights and within minutes I am getting an error message 'Can't select tile size.  Can you please advise. I am currently using Agisoft Metashape Professional 1.6.5.

Thanks.
Ian

6

General / Aligning 2 surveyed polygons approximately 1 mile apart.

« on: November 20, 2018, 07:56:23 PM »

I wonder if anybody can help me with a question I have about aligning two polygons which are approximately 1 mile apart. I have added the imagery for both polygons as a folder and imported the txt file. I duplicated this first chunk which contains all imagery for both polygons twice. so now I have 3 chunks. The first chunk I have renamed as master and this contains all imagery. The second chunk I removed imagery for the second polygon and called the chunk poly 1, Then for chunk three I removed all imagery for polygon 1.

Chunk 1 - all imagery
Chunk 2 - imagery for just polygon 1
Chunk 3 - imagery for just polygon 2

The two polygons are approximately 1 mile apart. Should I align these polygons as one unit (Chunk 1) or will I have to align these polygons separately ? I would be grateful for any advise please. I will be assigning GCP's to both polygons as we deployed aerial targets at both polygons.

Rainman

7

General / How to work with large datasets-Chunks

« on: October 30, 2017, 12:31:58 AM »

Dear Alex,

I am working with a large data set of photos (1600 images) based off a UAV that captures imagery from along a straight line and then back again, parallel to the first line, with about 80% overlap, (front and back and side to side). I have tried processing as one large project file but there are simply too many images and I run out of computer memory!!!!!

So I am creating 4 chunks and putting in about 400images in each chuck. Each image has lat,long, roll, pitch and yaw, so each chunk has its own camera position file. Is that correct to add?

Am I correct in thinking that once I have create each chunk and added the imagery and camera file to each chunk, I then align each chunk, then build dense point cloud for each chunk, once this is done can I then align all chunks together and merge as one. Trying to understand the whole process but there seems to be very little information available. I hope you can advise me of the whole process.

Regards

Ian

8

General / Image size mismatch error message using Rigid Camera Rigs

« on: September 05, 2017, 10:57:31 PM »

Dear Alexey,

I am trying the process of Rigid camera rigs, combing three bands (RGB, NIR and Thermal), that were taken flying over a vineyard. The RGB and NIR images are the same size but the thermal image is much smaller in size. I was hoping to use the rigid camera rigs process to process all three bands together but I keep getting the error message "Image size mismatch" and it references one of the thermal images. Due to the fact the thermal images are not the same size as the RGB and NIR, does this mean I am unable to process all three bands as one?

Regards
Ian

9

General / Size of Coded targets for UAV aerial surveys taken at 400m above ground level

« on: March 30, 2017, 07:00:28 PM »

I am hoping to start using coded targets from now on in all my sUAV aerial surveys, as it is far less time consuming. We typically use 9mp/12mp cameras for data acquisition of our imagery within the payload of the sUAV and fly at approximately 400m above ground level. I have read through some of the discussions here but I cannot find anything that suggests how to estimate coded target size. I am currently using version 1.2.6 PS. Is there a equation or something that I should be using to estimate the actual size the coded target needs to be for it to be successfully used in PS?

Regards
Ian

10

General / Using Rigid camera rigs to import imagery

« on: March 17, 2017, 01:57:47 AM »

I am using rigid camera rigs to import multispectral imagery (rgb and nir) and thermal imagery, I guess is this even possible in PS? I select the 'Create multispectral cameras from folders as bands'. I align and delete floaters and sinkers, build dense point cloud and build DEM, Build orthomosaic but when I go to export the orthomosaic nothing is built. Can anybody give me some advice on what I am doing wrong.