[OpenDroneMap-users] How to adjust processing parameters based on quality requirements

[Dakota Benjamin]

I agree with everything Simon has said. That being said, I started working on a table to organize my experience with playing with parameters, and what I would consider low- or high-quality. Take this as you will, it is certainly not an exhaustive or thoroughly researched list, only my own experience and intuition. I put the defaults in the "Med" category.  For a few of the parameters I did some benchmarking on a 32-core, 45GB RAM (45GB swap) machine. See attached for results.


I have started looking into the texturing/ortho settings but found them to be somewhat inconsistent as far as costs and quality of results go. I will have to spend more time on that.


Hopefully these will give you all an idea of what parameters to tune and by how much. You can also look at the wiki for more detailed descriptions of each parameter.


Parameter       Low     Med     High
--resize-to
        1200    2400    original
--min-num-features
        4000    6000    10000
--cmvs-maxImages
        100     500     # imgs
--pmvs-level
        1       1       1
--pmvs-csize
        4       2       1
--pmvs-threshold
        0.7     0.7     0.7
--pmvs-wsize
        6       7       8
--pmvs-minImageNum
        3       3       3
--odm_meshing-maxVertexCount
        10,000  100,000 1 million
--odm_meshing-octreeDepth
        8       9       11


[http://sig.cmparks.net/cmp-ms-90x122.png]Dakota Benjamin
Geospatial Developer
clevelandmetroparks.com<http://www.clemetparks.com/>

<http://www.clemetparks.com/>

________________________________
From: OpenDroneMap-users <opendronemap-users-bounces at lists.osgeo.org> on behalf of Khyale Nascimento <khyale at hotmail.com>
Sent: Thursday, June 2, 2016 2:22:47 PM
To: opendronemap-users at lists.osgeo.org
Subject: [OpenDroneMap-users] How to adjust processing parameters based on quality requirements


Dear colleagues,

First, congratulations for the development of OpenDroneMap project. I just install OpenDroneMap in a Linux machine and I need some help to choose the parameters to perform a low, normal or high quality processing. The images were acquired with inpireOne DJI drone (4K camera, gimbal). I have 42 aerial images with  12M pixels  (3992 x 2992), jpeg, geoTagged, captured at 60m height, ground sample distance (GSD) of 2.5cm / pixel.

I guess the processing quality parameters are:
 --resize-to
--use-opensfm
--min-num-features
--matcher-threshold
--matcher-ratio
--matcher-neighbors
--matcher-distance
--cmvs-maxImages
--pmvs-level
--pmvs-csize
--pmvs-threshold
--pmvs-wsize
--pmvs-minImageNum
--odm_meshing-maxVertexCount
--odm_meshing-octreeDepth
--odm_meshing-samplesPerNode
--odm_meshing-solverDivide
--odm_texturing-textureResolution
--odm_texturing-textureWithSize
--odm_orthophoto-resolution

I do not know the details behind the algoritms, but I want to tune the parameters to processing my set of images in low (quick), normal (standard) or high (slow) quality results. Can you help me? I know theses terms 'low', 'normal', 'high' are very subjective. But I need know a way to fine tuning the processing for show the results, compare it with other softwares, eg Pix4D, etc.

I am running  in a machine with Linux, Debian 8, amd64, with 12 processors (Intel Xeon 2.3Ghz), 32GB RAM. It is a HP Z820 workstation.

Thank you,
Khyale






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