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1
General / Re: RTK Integration with DJI Phantom Camera - Necessary?
« Last post by topodrone on April 21, 2018, 06:56:28 PM »
This is an example of using DJI PHANTOM 4 PRO PPK with 8 cm accuracy without GCP for quarry survey in Spain.

http://eng.topodrone.ru/reviews/blog-8-2/


2
General / Area measure
« Last post by Broken Arm on April 21, 2018, 10:38:17 AM »
Hi all

I try to measure the surface of a field that I already know using the following tutorial

http://www.agisoft.com/index.php?id=36

 but the area measurement does not give the right result.

Photoscan measures the area and the result is 10608 m2. But, the good result would be rather between 3400 and 3600 m2. The scale of the point cloud is right and when I measure the length and width of the field, the result is 3600m2. 

If anyone has an idea thank you very much.
3
General / Re: Agisoft PhotoScan 1.4.0 pre-release
« Last post by Alexey Pasumansky on April 20, 2018, 03:48:09 PM »
Hello Sören,

Can you please check if turning on "Load camera orientation from XMP meta data" option in the Advanced Preferences tab solves the problem for loading the angle information to the Reference pane from Sequoia camera?

The orientation angles would be used for optimization of the camera alignment, so if you are loading them, then they should be correct and the "Camera accuracy (deg)" parameter should be set accordingly to define the precision of the measurements.
4
Hello Sören,

Can you send an example image?

You can also use Raster Calculator dialog to set up the conversion to the temperature degrees and adjust the visual representation palette.
5
General / Agisoft PhotoScan 1.4.1 processing of thermal images from Tau2
« Last post by Sören on April 20, 2018, 03:19:21 PM »
Hi community,

When I import thermal image data (TIF) from FLIR Tau2 the images always remain black after “Set Brightness”. With black images, it is not possible to work using Agisoft. ;) What is your solution here to correctly stretch without losing EXIF data (GPS, etc.)? Should I send you a few samples?

Cheers,
Sören
6
General / Re: Agisoft PhotoScan 1.4.0 pre-release
« Last post by Sören on April 20, 2018, 03:02:58 PM »
Hello Sören,

The output of reflectance calibration is in 16 bit format according to MicaSense recommendations:
https://support.micasense.com/hc/en-us/articles/215460518-What-are-the-units-of-the-Atlas-GeoTIFF-output-
value 65535 means 200% reflectance and 32768 - 100% reflectance, so if you need to get values from 0 to 1, it's necessary to use Raster Calculator dialog, create several output channels (according to the number of input channels) and use the ratio equation for each band, then during export use Index Value option in the Raster Transform section...

Hi Alexey,

Thank you very much for your reply! Everything is working fine after I considered your notes.

Now, I have a few new question, which come up during processing my data with Agisoft:

1.   How to import rotation data (roll-pitch-yaw angle) of Sequoia: For GPS data it works automatically but for rotation data the columns remain empty. Do you have any solution (e.g. batch script) to read from EXIF and to import rotation data for all images (TIF)?

2.   Are the rotation data actually used during processing the image data?

3.   Is there an extension planned to export radiance values (in physical units)?

4.   Maybe not entirely correct for this form but: When I import thermal image data (TIF) from FLIR Tau2 the images always stay black after “Set Brightness”. With black images, it is not possible to work using Agisoft. What would be your solution here to stretch correct without losing EXIF data (with GPS, etc.)? Should I send you a few samples?

Cheers,
Sören
7
General / Re: Using Yaw Pitch Roll from DJI Drones
« Last post by wizprod on April 20, 2018, 02:42:52 PM »
Hello doctorben,

So you need to load Gimbal angles to the Reference pane?

Then just use
Code: [Select]
camera.reference.rotation = (yaw, pitch, roll)where yaw, pitch and roll values are read from the image header.

How do I relate to a specific imagefile, when using your script to extract the information?
8
General / Re: Dual GTX1060 GPU Processing Issues - Photoscan
« Last post by Alexey Pasumansky on April 20, 2018, 01:54:01 PM »
Hello inked88,

PhotoScan 1.4 supports GPU utilization for the following stages:
- image matching (the first phase of Align Photos stage, includes feature points detection, preselection and image matching itself),
- depth maps calculation (first phase of Build Dense Cloud stage and experimental mesh generation procedures ),
- refine mesh operation.

All other stages use CPU only.

Also note that you do not need to use system settings (like Affinity dialog) to disable CPU cores.
9
General / Re: Orthophoto
« Last post by Alexey Pasumansky on April 20, 2018, 01:28:24 PM »
Hello rolucahe,

Can you please provide additional information about the workflow you are planning to follow?

In PhotoScan the orthomosaic is usually one of the final products of the image processing.
10
Hello Yoshihiro,

We usually recommend to use gpu_mask parameter for starting the node to specify, which GPUs should be used.

Alternatively, in the Network Monitor it is possible to modify the GPU Mask value for any connected node.
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