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Author Topic: How long to create dense point cloud?  (Read 3265 times)

Paula Lightfoot

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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,
Paula
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. 

Alexey Pasumansky

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Re: How long to create dense point cloud?
« Reply #1 on: February 22, 2017, 01:46:39 PM »
Hell Paula,

Do you have any discrete GPU on your computer? Is it enabled in OpenCL tab of PhotoScan Preferences window?
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Alexey Pasumansky,
Agisoft LLC

Paula Lightfoot

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Re: How long to create dense point cloud?
« Reply #2 on: February 22, 2017, 02:20:42 PM »
Hi Alexey,
There's NVIDIA GeForce GTX 970.  I think I will have ticked it in the OpenCL tab because I was following the very helpful Tutorial for Orthomosaic and DEM generation with GCPs and this instruction was on page 1, but I'm not sure if I can check right now...I'm wary of opening any other windows in Agisoft while it is processing, in case doing so might cause it to stop/crash.
Also I gave the wrong processor information in my first post, it's 1.9 GHz not 2.4 GHz (I had assumed the computer running Agisoft had the same specs as others in the office, but it is different in that respect).
Thanks
Paula

Alexey Pasumansky

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Re: How long to create dense point cloud?
« Reply #3 on: February 22, 2017, 03:40:17 PM »
Hello Paula,

I'd assume that dense cloud calculation on Ultra may take days on slow processor without GPU. But even with GTX 970 it should be much faster anyway.

Do you have the processing log redirected to the external file or probably you have Console pane opened in the current PhotoScan instance?
Best regards,
Alexey Pasumansky,
Agisoft LLC

Paula Lightfoot

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Re: How long to create dense point cloud?
« Reply #4 on: February 22, 2017, 04:01:52 PM »
Hi Alexey
The Photos pane is open - when I click on the Console pane it doesn't open because it is still processing.  Sorry I'm not sure about where the processing log is redirected to, I haven't edited any settings related to that. 
Thanks
Paula

Paula Lightfoot

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Re: How long to create dense point cloud?
« Reply #5 on: February 22, 2017, 08:03:53 PM »
I cancelled it and restarted from the beginning, it is working fine now.  There was a problem 'NVIDIA unable to recover from a kernel exception' but it is all ok now.  Thank you for your quick response!