Messages

1

General / Re: Zero Resolution issue

« on: May 09, 2022, 09:19:13 PM »

Alexey,
OK I just sent it.

Regards,
David

2

General / Re: Zero Resolution issue

« on: May 03, 2022, 12:23:40 AM »

Alexey,
The last bit of the Console output is in the attached JPG file.

Not sure what you mean by camera alignment settings but in the "Build Dense Cloud" dialog, Quality is set to medium and Depth Filtering is mild.  I am also attaching JPG files of several other dialog boxes with various settings. I hope this is what you need?


David

3

General / Zero Resolution issue

« on: April 27, 2022, 11:30:32 PM »

Greetings.

I am running Metashape version 1.8.3. build 14331 (64 bit). I am processing imagery from a Micasense dual camera system. It is a fairly large project with 2869 cameras. I've processed jobs of this size in the past with no problems.

I'm running into an issue that I've never seen. When I get to the point of generating a dense point cloud, it chugs for a bit but then gives me a "Zero Resolution" error. I found the note regarding this issue that suggests that updating the driver for my GPU may solve the issue. I've done this but I still get the same error.

The bounding box is quite a bit larger than the extent of the sparse point cloud (another thing that is mentioned as a possible fix).  In the photo panel, clicking on the depth map indicates that none of the images have a depth map but I'm not clear on what this means.


Specs on my computer:

Intel(R) Xeon(R) CPU E5-1620 v3 @ 3.50 GHz
RAM 32 GB
GPU: Nvidia GeForce GTX 1080 Driver version 512.59

I'd be grateful for any suggestions.

David Wallin

4

General / Sequoia camera; reflectance calibration without reflectance panel images

« on: October 29, 2021, 02:26:58 AM »

Greetings. I have some old images acquired using a Parrot Sequoia 4-band camera. Unfortunately, it appears that either I neglected to get images of the reflectance panels or maybe I have just lost those images. I did fly with the sun sensor in place. I tried doing the "calibrate reflectance" procedure just using the sun sensor but I got a "calibration failed" message. Can anyone provide a suggestion on how to proceed? It is not clear to me if the sun sensor data is attached to each image or where it is stored. In looking at the image properties and "details" tab for each image, I don't see anything that looks like calibration data.

Thanks for any suggestions!
David Wallin
david.wallin@wwu.edu

5

General / Red_edge_dual_dense_pt_cloud_problem

« on: June 17, 2020, 01:04:26 AM »

Greetings.

I am processing imagery from the Micasense Red Edge Dual Camera system. This generates a 10-band image. The data set includes 2170X10 tiffs covering a study area that is about 250 m by 2500 m. I have successfully run the reflectance calibration procedure and all of the images aligned. I have 28 GCPs. The sparse point cloud looks fine (jpg attached). When I run the dense point cloud procedure, the result has large holes in it (see attached JPG).

Any suggestions on how I can get a dense point cloud that covers the entire study area?

Regards,
David

6

General / Re: Thermal Orthomosaic Workflow

« on: May 21, 2020, 11:37:06 PM »

So I should NOT change the pixel size to 0.017 by 0.017? And I sure do not understand why I get a different result every time I run this. Computers are pretty darned good at doing the same thing over and over and getting the same answer.

I'm flying during the day. Not sure what you mean RE "environmentals and TReflect." I've never taken the thermography class but I'll consider doing so when things open up a bit. It seems to me that if you know the emissivity (and for clear water this is easy), it should be straightforward to get surface temperature.

Your thoughts? What am I missing?

7

General / Re: Thermal Orthomosaic Workflow

« on: May 17, 2020, 07:20:28 AM »

And as a follow up, after I generate a thermal mosaic using RJPG images, how do I convert this to a temperature layer? I understand the issue of emissivity. In the terrestrial environment, there is considerable variation in emissivity among cover types. But my study area includes a river and water has a consistent emissivity. I'd like to be able to get water surface temperature.

How can I do this? Or should I be storing images as TIFFs rather than RJPG?

Regards,
David
 

8

General / Re: Thermal Orthomosaic Workflow

« on: May 17, 2020, 04:54:35 AM »

I am following this thread with great interest. I've been trying to mosaic XT2 imagery for some time with very limited success. The info in this thread has been intriguing. When I go to Tools-Camera Calibration, the pixel size that comes in by default is 0.0919118 by 0.11489. I've tried changing this to 0.017 by 0.017 as suggested, then aligning. I've run the alignment process several times. For each run I've start from scratch by starting a new project, load images new each time and each time I gone into the camera calibration window and set the pixel size to 0.017.

Different images get aligned on each run and my sparse point cloud is multilayered.

One other wrinkle that may or may not be significant. I went into FLIR tools and loaded one of the images. FLIR tools reads this as an image taken with a 19 mm focal length. Metashape camera calibration reads it as a 13 mm focal length. Looking at the lens on my camera, I've confirmed that it is a 13 mm lens.

Screenshots from each run are shown in the attached file. I'd be grateful for any suggestions.

Regards,
David
 

9

General / Re: align thermal images from XT2

« on: September 04, 2019, 07:52:08 PM »

Alexy,
I tried this and it helps a bit...but not much. I now have 1145 of 2104 images aligned. Do you have any other suggestions for how to proceed?

Regards,
David

10

General / align thermal images from XT2

« on: September 04, 2019, 07:52:59 AM »

Some time ago, I posted a request for guidance on aligning thermal images from an XT2 camera (512X640 resolution 13 mm lens). I've received no suggestions so hoping that by reposting I might get some suggestions. I have followed the same workflow that I've used for aligning standard RGB images but when doing so, only 1/4 to 1/2 of the images align.

I would be grateful for any suggestions.

Regards,
David Wallin

11

General / thermal mosaics using XT2 camera

« on: May 31, 2019, 12:41:35 AM »

Greetings. I just purchased a DJI Zenmuse XT2 thermal camera; 640X520 resolution with a 13 mm lens. I'm flying it on a DJI M210 quadcopter.

My objective is to create thermal mosaic images (and a co-registered RGB mosaic and surface model) of rivers to detect thermal refugia created by intermittent seeps of cold water from small tributaries and springs.

Can anyone point me towards a workflow for achieving this? Recommendations for mission planning software as well as image processing recommendations would be greatly appreciated.

Regards,
David

12

General / Camera calibration; importing data from Lens software

« on: December 11, 2018, 09:28:59 PM »

Greetings,
I am using a DJI x4s camera on an M210. I ran the Lens software to acquire camera calibration data and I've then imported these data into Photoscan. I'm confused since the parameter values displayed in the Lens software do not match the same parameter values after importing into Photoscan. See the attached jpgs.

Can anyone explain this?

Regards,
David

13

General / Re: placing markers in Parrot Sequoia imagery; green images too dark to locate GCPs

« on: December 05, 2018, 10:02:03 PM »

Alexey,
Great! That works. Thanks very much!

Regards,
David

14

General / placing markers in Parrot Sequoia imagery; green images too dark to locate GCPs

« on: December 05, 2018, 01:57:14 AM »

Greetings. I've just aligned a set of multispectral images acquired using a parrot sequoia camera. In the photo panel in Photoscan, it is just displaying the green band for each image (not the red, red edge or NIR bands). The images for the green band are all very dark and it is extremely difficult, if not impossible, to see the GCP markers that I placed throughout the study area prior to the flight. Is there a way to display the other bands or can I somehow brighten the green images to facilitate the placement of markers in the images?

Thanks,
David

15

General / Re: parrot sequoia calibration

« on: December 01, 2018, 04:53:57 AM »

Alexey,
Great! Just the info I was looking for. Just out of curiosity, how can I see the info from the Sun Sensor? For any given image, if I go to "properties" in the image, I've scanned through the "details" tab, and the other tabs as well but I don't see anything that looks like it could be sun sensor data. And what are those two .dat files anyway?

David