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Topics - Paula Lightfoot

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General / Problem opening mesh (.3ds / .wrl) files in ArcGIS
« on: April 02, 2017, 12:43:37 PM »
I've been using PhotoScan v 1.3 to create georeferenced models from UAV imagery.  I've had no problem opening and working with point clouds and DEMs in ArcGIS v 10.3, but haven't managed to open meshes in ArcGIS.  I've tried exporting in .3ds and .wrl format and using the Import 3D Files tool in the Arc toolbox.  The files are ~1-4 GB each, i.e. a similar size to the point cloud files which I was able to work with in ArcGIS.
I was getting the error message "An attempt was made to reference a token that does not exist" and now I'm just getting the error message "No Valid Files" (even though I'm using the same files as before).
I can create a TIN from a .las dataset in Arc but only for the lowest density point clouds, and it's the high density ones I'm interested in.
Please can anyone give me advice on how to export and open meshes?

when creating a dense point cloud from the same photos, same GCPs, same camera position data and same settings (ultra high quality, moderate depth filtering) I get slightly different results each time.  Is that to be expected?  I'm trying to work out which parameters (particularly which level of depth filtering), gives the most accurate results, but it's hard to judge this if the results are different each time.

General / Question about depth filtering
« on: March 15, 2017, 01:15:01 PM »
While building dense point clouds from UAV imagery, I've tried mild, moderate and aggressive depth filtering to compare results and see which would be best for my project.  When applied to exactly the same data with all other parameters the same, I noticed that mild filtering produces a point cloud with the lowest total number of points and point density, while moderate filtering produces a point cloud with the highest total number of points and point density.  Aggressive filtering produces results that are in-between moderate and mild, in terms of number of points and point density.  Does that sound right?  I am new at this, but I was expecting moderate filtering to produce results in-between mild and aggressive, or is there no correlation expected between the level of depth filtering and the point density of the output?

General / Error message - GPU processing failed
« on: March 03, 2017, 02:24:16 PM »
I've used Photoscan Professional v. 1.3 to create dense point clouds from UAV imagery at moderate and high quality, but when I try to create one at ultra-high quality from the same project I get the error message "hierarichal SGM failed. GPU processing failed, switching to CPU mode, unspecified launch failure".  Processing continues for a while using just the CPU, but it does not manage to complete.  This has happened twice. The GPU device is NVIDIA GeForce GTX 780 (12 cores @ 954 MHz) and it is ticked as enabled in preferences.  Please can you give me any advice?

General / How long to create dense point cloud?
« on: February 22, 2017, 01:37:19 PM »
Hi, this is my first time using Agisoft so I wasn't sure what processing time to expect, please can anyone tell me if this sounds right?  My project consists of 133 images taken by a UAV at an average ground sampling distance of 4cm.  The combined file size of all the images is 543 MB.  I have 7 ground control points, each marked in around 15 images.  The images are georeferenced including orientation information.  My computer has Windows 7 64 bit operating system, 2.4 GHz processors and 64 GB RAM.  I'm using Agisoft Photoscan Professional v1.2.  I selected 'ultra-high' quality (with hindsight perhaps not a good idea for my first attempt!) and started creating the dense point cloud two days ago.  It now says it is 34% complete, has been running for 45 hours and has 83 hours to go.  Also, the time remaining has increased, because yesterday it said it had 55 hours to go.  Does this length of processing time sound normal for a project of this size? 
Thank you very much,
PS I have created a dense point cloud from the same images using the UAV's software (Sensefly Pix4D) and it took around 2 hours. 

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