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Messages - xabierr

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31
Python and Java API / Re: Multi view stereo with known cameras aligment.
« on: December 18, 2019, 02:09:40 AM »
Hi there,

I have used the quick layout script to align images with known location and orientation. Given that my site has minimum texture (open water), Im wondering what would be the best approach to match the photos and build points? Is there a way to "force" this in order to mosaic the images?

cheers,

Javier 

32
General / alignement of featureless images
« on: December 05, 2019, 02:09:56 AM »
Hi there,

Is there any way of "forcing" alignment/mosaicking based on the precise camera location and orientation data? Trying to work with a set of featureless water images where I cant place GCPs either.

cheers   

33
General / Error when creating orthomosaic from thermal imagery
« on: October 16, 2019, 03:08:17 PM »
Hi all,

Im processing thermal images taken with a Flir Vue Pro. The images were georeferenced using coordinates from less frequent RGB images. The point cloud seems ok but tilted and resultant orthomosaic consists of only a few pixels, even when rotating the region. Not sure what is going on as same project worked with the previous Photoscan version.

Ive uploaded the project (ver 1.5.5 build 9097) to: https://www.dropbox.com/sh/4xqgwm1r6xmg8zn/AAAko59FBPJYKFxhfgfugIoGa?dl=0

cheers,

Javier

34
General / Re: P4 RTK with GCP
« on: October 16, 2019, 02:57:46 PM »
Yes but you only need a couple GCPs to optimise.

35
General / seeing through sparse vegetation
« on: October 11, 2019, 05:21:42 AM »
Hi all,

Im trying to get ground points through very sparse vegetation and wondering if anyone has suggestions in terms of processing. At the moment I have high overlap (80% forward and side), combining nadir and oblique images and using aggressive depth filtering to build the dense point cloud. Any ideas?

cheers,

Javier

36
General / Re: Workflow to process the Photography of "PHANTOM 4 RTK"
« on: September 05, 2019, 11:51:27 PM »
I have been doing some testing with the new P4R and getting some good results. I can't seem to enter the DJI dewarp Xmp data so that it means anything to Metashape, has anyone else yet? The auto adjusted camera parameters seem to been getting pretty good accuracy without GCP and even better just using 1 GCP.

Was flown with D-RTK2 base over known point shot with Trimble R10, lens correction turned off in RTK app. Ground control also shot with R10.

Coordinates converted to OSGB1936 in metashape before alignment and loading GCP.

I have tried to do a lens calibration with the chessboard in metashape but get very different parameters than what I see after a flight and optimisation. Anyone else been able to calibrate the P4R lens successfully with metashape?

Without running the optimisation the Z error is over 21cm but down to 6cm after. Using just one GCP tightens things up further to less than 3cm.

See reports https://drive.google.com/drive/folders/1LekTi82gf9Vq4cYkg_4s79YTnccYmgrr?usp=sharing

Let me know your thoughts.

Cheers


Why did you use all coefficients except p3 and p4 when optimising? What is the general rule of thumb when choosing them?

37
General / DJI P4 RTK optimization
« on: August 12, 2019, 04:28:11 AM »
Hi there,

Is optimization using the imported camera accuracy (for example from the P4 RTK's XMP) or is it using the measurement accuracy defined in the reference settings?

cheers,

Javier


38
General / Re: Underwater mapping model curved.. help?
« on: July 03, 2019, 09:08:26 AM »
the use of control points/scale bars will remove the bowl effect.

39
Hello Dragline,

Can you provide the PDF report for this project and specify, which accuracy settings have been used for the cameras in the project?

Alexey, do we have to change the accuracy settings for the cameras (e.g. average reported precision from EXIF) or are the accuracies read directly from each camera?

40
Does the workflow include optimising the cameras after alignment? Would it make much difference using the precise camera positions (no additional GCP) to optimise?



41
Hi Amy,

Any solutions for this??

42
General / point classification legend
« on: June 19, 2019, 11:23:43 AM »
What is the legend/colours used for the automatic point classification?

cheers,

Javier

43
General / reseting optimization
« on: April 24, 2019, 10:02:36 AM »
Is there any way to reset the optimization step? Will unchecking all markers and running optimization work? Or are random errors always introduced?

44
General / Re: Questions about new calibrate color feature in 1.4
« on: August 02, 2018, 01:58:22 AM »
Can you run the calibrate color function in batch??

45
General / Importing GIS raster as texture
« on: April 18, 2018, 01:49:33 AM »
Is it possible to import a GIS raster (geotiff) as texture and then export the model (obj)? 

I would like to import a slope layer (values 0-90) which was derived from the DEM (i.e. same extent, resolution). But when I import the file as texture I get a BW image and when I try to set the colour palette using one of the bands (B1) with values 0-90, the resultant image does not make much sense. 

What is the best workflow?

Thanks.

Javier 

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