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Messages - cioro

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General / Re: New AMD Ryzen 7 processor

« on: October 06, 2017, 11:08:28 PM »

We're looking to build a Threadripper Agisoft Workstation and just wanted to know if there is some experience in already running this kind of machines. Thanks!

General / Re: Orthomosaic Artefacts How-Too

« on: August 07, 2017, 04:05:41 PM »

You can try also to use a decimated mesh for the ortophoto build stage. If you have a good side/frontal overlap, let's say 70% for both, you can try also the following steps:
- build dense cloud on high settings
- build mesh
- decimate mesh and build ortophoto (try & see) until you are satisfied
Normally you'll not need any manual selection of the photos

General / Re: False interpolation of points below tree canopy

« on: August 03, 2017, 11:12:03 AM »

In my opinion the biggest problem in this situation is the huge difference in lightning condition between trees and the ground under the trees. An idea is to make on more flight and take some overexposed photos in order to have more details on the ground, but still it is a difficult task to reconstruct the ground under the trees no matter the software.

General / Re: Mission Planning using DJI M600 & Sony A7R (II)

« on: June 29, 2017, 11:02:31 PM »

Hi,

thank you all for your good advice.
In my opinion choosing A7R/A7R II as a payload for multicopter for photogrammetry is not a smart choice for the following reasons:
- weight, body only is 620gr and this payload will need bigger gimbal also
- 5 axes image stabilization, this is no good for processing because each image will have different camera internal parameters and the processing software will approximate them with a greater error than will do for normal camera.
- large sensor is not needed. same GSD can be obtained by flying at same altitude with smaller sensor but having a lens with longer focal distance
- (not sure) A7R, A7R II cannot take one picture per second
- shorter battery life
- expensive payload
I would have a look to A6300 which has a great sensor in it, no image stabilization, body weights only 400gr and can take at least 1 picture per second which means that you can fly lower (to get almost the same resolution as you will get with A7R) but faster in order to get the same frontal overlap. With this camera carrying a prime lens you can do very precise point clouds with proper image overlapping.

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