Topics

1

General / Laser Scan import issue

« on: April 26, 2019, 04:49:26 PM »

Hi,

So i am trying to import a laser scan into Metashape (scan: https://we.tl/t-Wbfq3nl4IH) but i get the strange circular projection display'd in the screenshot below.



The initial file format was `.ptx` but i converted them in cloud compare to `.las` and `.ply` . Unfortunately i get the issue in the screenshot above for both files. Any ideas what i might be doing wrong?. Thanks.

2

General / GCP coordinates from Trimble catalyst CSV

« on: May 19, 2018, 03:23:53 AM »

Hi,

I have a few questions on importing the Trimble catalyst GCP coordinates into Photoscan.



So the trimble CSV file i export has the HPrecision (Horizontal precision) and VPrecision (vertical precision). However, when i import the markers as CSV file in Photoscan and i want to set the accuracy columns, it asks me for the Longitude and Latitude columns, yet i only have one Horizontal precision column and not for both Longitude and latitude individually. I would assume my CSV `HPrecision` is ((Longitude precision + latitude precision)/2) but when i enter the same `Hprecision` column number in the Agisoft CSV importer for both the Longitude and Latitude precision, it, after import divides the  Hprecision/Vprecision. Is this correct?, If my HPrecision is say 0.7m and VPrecision 0.3, is it correct that the overall accuracy is 2.33 m?

Second question.

So the Trimble CSV gives me the `height above the ellipsoid (HAE)` in WGS84 instead of height above sea level. Is this good or should i somehow convert it to altitude above sea level?. For example those GCPs in the images were measured here in the Netherlands where we are about 0.8m above sea level, so saying a height of 44.8m sounds kind of strange. Thus far i was always used to my UAV images being geotagged with altitude above sea level. I read somewhere that this has something to do with the vertical reference not being in EGM96 but am not sure.

Thanks!

3

Bug Reports / Bug: Photoscan crashes on Alignment of a large nr frames (4D tools)

« on: December 28, 2016, 01:31:10 AM »

For the last few months i have been testing the Agisoft Photoscan's 4D timeline tools. Unfortunately Photoscan has a bug when doing the alignment step, it can't handle more than 200-300 frames, anything above that and it crashes. This is independent on alignment quality, i can set it to lowest quality and it still crashes. I have tried it across multiple projects with different data but it still crashes. Also, it would be great if we at least could do the alignment of only a few frames, which is not possible, it aligns all the frames which means that with this bug Photoscan is as good as useless for 4D photogrammetry. I have send many crash reports but i have yet to receive a report on what the issue is. I will upload a recording of the alignment and the crashing for you guys to see, maybe it helps to figure out the problem.

https://www.youtube.com/watch?v=VVub_A1QTM0&feature=youtu.be

4

Python and Java API / Script run error when using large timelapse sequence (urgent)

« on: December 09, 2016, 03:21:12 AM »

Hi,

So normally to be able to produce a DEM i run a python script in Agisoft Photoscan that uses 3x detected markers (at a 90 degree angle, 6774 total markers across all frames) in all the images and orientates the models to the ORIGIN-X-Y plane to be able to produce a DEM. Now for single models or even a time-lapse(4D tools) of say 30-60 models this works fine. However, i am now working with data-sets of 1200 frames (140,000,000 total points of sparse cloud, which is allot of data). Marker detention  and tracking all goes well but when i run the script i get this:


2016-12-09 01:04:14 found X point

2016-12-09 01:04:14 Found center point

2016-12-09 01:04:14 found Y point

2016-12-09 01:04:14 Found all markers

2016-12-09 01:04:14 Traceback (most recent call last):

2016-12-09 01:04:14 File "C:/Users/meije/Desktop/Agisoft scrypts/box.py", line 110, in <module>

2016-12-09 01:04:14 chunk.updateTransform()

2016-12-09 01:04:14 SystemError: error return without exception set


It looks like because the data-set is so large, it doesn't update the environment quickly enough (chunk.updateTransform()), please help me with these ASAP, this is urgent as these models are generated on a system that costs allot to run.


Scripts (attached)



 

5

Feature Requests / DEM color export

« on: November 28, 2016, 02:39:44 AM »

Is there a way to export the DEM as a .PNG or .JPG color image (like how we visualize them in Agisoft) with hillshade enabled?. I need to export 1000 DEM's from Agisoft but changing the color in Arcmap one by one is way to much work.

6

General / I need some help with: 4D model observation using VR, deformation recording.

« on: November 26, 2016, 04:57:53 PM »

Ok, so i have a sequence of 3D models in Agisoft photoscan using the 4D tools, now i want to do the following:

1) Export all frames combined to be used for Dynamic VR observation, how can this be done?, what file format do i have to export the 4D model...?
2) I want to record the 3D deformation of my models in the form of a .avi video file for scientific publication, how can i record the deformation?, so far i managed to use a screen recording software, is there another way to do this?
3) I have seen YouTube videos of people using the 4D models created Agisoft for visualization using VR, is there any documentation/tutorials on this or has anyone here manged to view a 4D model using the HTC vive or the Rift?.

Thanks!

7

General / Orthomosaic sequence export of a 4D model overwrites file (solved)

« on: November 24, 2016, 09:44:45 PM »

Hi,

I am using the 4D tools to create a dynamic model in the latest Agisoft Photoscan professional at Utrecht university, i want to export the orthomosaic for each of the models,  it asks me if i want to export all frames, i click on yes and now it should export a tiff file for each of the 3D model frames, however, Photoscan just overwrites the same file every time and thus only the last model orthomosaic will be exported, this should not be happening, is  something wrong with photoscan?, is this a bug?. thanks.

8

Feature Requests / Physical Geodynamic modeling(4D modeling) - BSc Thesis

« on: February 18, 2016, 07:12:12 PM »

Hello,

My name is Meije, i am a 3rd year Geo-science student at the University of Utrecht. For my BSc-thesis i am going to do physical geodynamic modeling, in a nutshell a "cake" with many layers representing rock layers is made and deformed with hydraulic presses. My goal is to create a 3D dynamic model of the experiment(4D=3D+time) that can be viewed with a VR(HTC vive) headset. I am familiar with making 3D models in Agisoft from images taken from a UAV's but those models are static. I have heard about the "Agisoft 4D timeline toolkit" but i have no experience with this. I am reading information about videoframmetry by taking multiple cameras and essentially making a 3D model of each frame or intervals of frames. Video has less resolution than images so the resolution of the dynamic 3D models will also be less.
Taking many photos each second with a still photogrammetry rig and making a 4D model of these images will have higher resolution but lower framerate, 30fps is cool but not really necessary, is it possible to do this with Agisoft?. Also can anybody please give me information on how such a setup would work and what resources/tutorials are there so that i can learn how to do this in Agisoft?.
Thank you!

-Meije