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Topics - Pkroks

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General / Tweak to limit GPU load during dense cloud generation
« on: August 17, 2021, 04:26:26 PM »

I am struggling to complete processing and seem to have an issue when I try to do processing on High or higher settings. Medium completes in no time..

I remember reading there is a tweak parameter that can be used in the preferences to limit the load placed on the GPU and CUDA cores to help the system to complete; it takes a bit longer but the load isn't that high.

I have previously had issues with this laptop of mine - I have reinstalled the latest Nvidia drivers from the nvidia website directly. I have also updated all windows and Agisoft and as of the last ten days or so I cannot complete any processing on High settings.

Any help is appreciated.

Bug Reports / Cuda stream destroy failed unknown error (win10 pro)
« on: March 17, 2019, 12:47:12 AM »

I have just updated my windows 64 bit to

windows pro version 1809 (build 17763.379)
nvidia gtx 1070 with driver version 419.35

agisoft metashape version 1.5.1 build 7618

I try to build the depth maps using CUDA enabled card and it gives me the error:

2019-03-16 23:33:38 GPU depth map warping failed: unknown error (30) at line 179
2019-03-16 23:33:38 using CPU implementation...
2019-03-16 23:33:41 Error: Kernel failed: unknown error (30) at line 115
2019-03-16 23:33:41 GPU processing failed, switching to CPU mode
2019-03-16 23:33:41 [CPU] estimating 994x1321x128 disparity using 994x1321x8u tiles
2019-03-16 23:33:42
2019-03-16 23:33:42 Depth reconstruction devices performance:
2019-03-16 23:33:42  - 5%    done by CPU
2019-03-16 23:33:42  - 95%    done by GeForce GTX 1070
2019-03-16 23:33:42 Total time: 85.324 seconds
2019-03-16 23:33:42
2019-03-16 23:33:42 Warning: cudaStreamDestroy failed: unknown error (30)
2019-03-16 23:33:42 Warning: cudaStreamDestroy failed: unknown error (30)
2019-03-16 23:33:42 Error: unknown error (30) at line 211
2019-03-16 23:33:42 Saving project...
2019-03-16 23:33:42 saved project in 0 sec
2019-03-16 23:33:42 Finished batch processing in 327.745 sec (exit code 1)

I have tried to roll back the nvidia drivers to versions 397.64 and even back to 385 where I had no issues, but then I get a different error message - I try to enable to CUDA graphics in preferences and it brings up the following entry:

the procedure entry point fatBinaryCTl_creathandle could not be located in the dynamic link library c:\\windows\system32\driverstore\filerepository\nvcvi.inf_amd64_3c5b42cdad4fff4f\nvopencl64.dll

any advice or work arounds to get it working would be appreciated. thanks

General / Tree/plant counting
« on: October 27, 2018, 03:34:29 PM »
Hi everyone,

Simple question that may have a simple answer - what does everyone use to count crops/trees/plants? Does agisoft photoscan do this? If yes please could you point me in the right direction.

Many thanks

General / Thermal orthomosaic - Flir Duo Pro R
« on: July 19, 2018, 09:45:08 AM »
I'm trying to create a thermal orthomosaic from imagery captured with the Flir Duo Pro R.

The imagery is captured at 40m AGL, taken using 1sec intervals, flying at speeds of 15km/h, flying along rows of solar panels. Overlap of these images is really high, 80% or more. The final image works out to be a Radiometric Jpeg file containing radiometric data (temperatures for each pixel).

I am looking for a workflow or instructions on how to use this imagery to process an orthomosaic and use a thermal mesh to display as a thermal layer perhaps over the rgb orthomosaic.

The beauty of the Flir duo pro R is that the images are taken at the same time, two lenses and the final RGB imagery once the full photo is extracted from the RJPG becomes 4000x3000 pixels. So it is relatively high. The thermal sensor resolution is 640x512 pixels. According to a few forum posts, I gather you can potentially stitch the RGB, and then overlay the thermal layer (lower resolution so harder to stitch straight up) on top of the surface model?

Please can someone help point me in the right direction to be able to create a thermal orthomosaic from this imagery. I have tried to use pix4d trial version - as they have instructions regarding thermal imagery in their support section, but I would like to use agisoft photoscan, as this is what we use for all our other processing.

I do have other imagery where by I flew the same area at 80m above ground, with 80% overlap and 85% front lap in a grid pattern, pictures every 1second, captured using drone deploy to fly the grid at a consistant speed.

General / Automatic roof detection and extraction
« on: May 12, 2018, 09:52:51 AM »
Hi guys,

Interested to know if anyone has an algorithm or a method for automated roof detection, isolation and extraction of edges and pitch etc for.building modeling.

I am trying to use photogrammetry to isolate a roof and extract shape files of the edges for import into autocad. Only just begun looking into it but I believe some people are using ransac algorithms in order to.identify the edges.

Any direction or links you can provide would be much appreciated.


General / Urgent help needed - Ridge lines in DSM/DEM export
« on: February 19, 2018, 04:47:04 PM »
Hi Everyone,
I have used Agisoft at work for some time now. I am currently doing a 1800 ha map of a farm. The client requires DSM and Ortho and then contours. Accuracy was not a priority as he wants a general overview of the land for planning purposes.

Drone was flown at 240m AGL. Sony NEX5T with 16mm lens. GSD was approx 7cm/px.  80% overlap, 70% sidelap. Approximately 4600 images are used.

I am constructing the Ortho and DSM but am experiencing a problem. There are these ridges appearing in the DSM at it appears to be where some flights over lap.

I have gone through processed 3 times now.

First time I didn't use any manual tie points and markers. I saw the ridges and so thought immediately to place manual tie points.

Second time processing I used the manual tie points - this corrected the initial ridges only to discover other ridges appeared elsewhere on the model. I used approximately 45 markers across the area.

Third time processing - I aligned all the flights in chunks, and then merged the chunks and aligned. Still have the same issue.

I am currently redoing the alignment on High as we speak and will be doing medium dense cloud with no depth filtering. including even more manual tie points and markers.

Please if anyone can advise on how to fix these ridge lines that would be great.

The settings I am using are:
Align - High,
Dense cloud - medium,
depth filtering - mild

My system is -
intel i7 8700k at 3.7ghz
nvidia gtx 1070, 8gb
32gb ddr4 ram
250gb samsung 850 evo SSD
1tb SSHD seagate hybrid drive

I have even looked at purchasing one month license for pix4d to see if that will improve the output.

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