Messages

1

General / Re: Band combination in Photos View

« on: June 06, 2023, 12:28:41 PM »

Thank you @noodlez.
I have started to work on another large project and the "global" brightness change helped a lot.
Jan

2

General / Band combination in Photos View

« on: March 31, 2023, 09:54:37 AM »

Hello!
I am working with multispectral imagery captured by Altum camera (no IMU). In the Photos View I see only the first (grey-scale) band. Is it possible to visualize the Photos in some band combination? I am trying to identify GCPs, but in the grey-scale it is very difficult.
Thank you
Jan

3

General / 3D feature creation using stereoscopic view

« on: October 19, 2022, 01:44:09 PM »

Hello,
is it possible to interactively create 3D features by placing them directly on the terrain (like the standard photogrammetry SW do) using the stereoscopic view? I am able to view the scene in 3D, but I would like to "place the cursor on the surface" and create a point there.
Thank you.
Jan

4

General / Multipage TIFFs from TETRACAM ADC processing

« on: March 08, 2019, 03:06:13 PM »

Hello,
we have mastered the data collection technique using the TETRACAM ADC Lite camera on our small aircraft (in combination with stable gimbal) and there is no problem in computing the data in Metashape. So far I have played around only with coloured JPGs exported from the Tetracam PixeWrench2 software.
I wonder if I can get some more information contained in the imagery creating the Multipage TIFF from the RAW images obtained by the Tetracam ADC Lite - if the camera in fact collects data only in three bands (R-G-NearIR).
In the attached image are the possible layers for creating the Multipage TIFF.
Thanks for any hint.
Jan

5

General / Re: Creating coordinate system from a model

« on: November 20, 2018, 11:04:44 AM »

Actually - if you want to establish your local coordinate system, than you require at least 2 points. You choose one as the beginning of the coordinate system [0, 0, elevation], than measure distance to the second point and this point will have coordinates [0, distance, elevation]. Based on this you may start calculating the other point's coordinates using trigonometry or measure the points using a total station. The laser scanning should you the exactly same coordinate system and the point clouds should match exactly!
I do exactly the same when I am documenting archaeological research in desert, where is no coordinate system nor RTK GPS available.
Packy

6

General / Re: GCP Error Explanation

« on: November 20, 2018, 11:01:38 AM »

If the base station has 2 m accuracy than you can not expect the GCP error to be low I do RTK measurements with 2-5cm accuracy and my GCP errors are (after point cloud optimalization) abour 5cm.
Packy

7

General / Re: How to make a good orthophotomosaic

« on: July 12, 2017, 11:28:48 PM »

Well - you should try to incorporate oblique images or try larger side overlap.
Jan

8

General / Re: Geotagging photo's on non-GPS Camera

« on: June 16, 2017, 08:13:15 PM »

Yes - this looks really interesting.
I have contacted their support - so I am awaiting "the good news"
Jan

9

General / Re: Elevation error when increasing processing quality

« on: June 16, 2017, 08:11:46 PM »

Hi,
I had similar problem - and it was caused by a "bad lens" (to wide and low quality ... came with Sony NEX7). New camera (Nikon D810) and new lens solved the problem for me 

Jan

10

General / Re: Marker and GCP Question

« on: June 11, 2017, 10:17:54 PM »

You have to use some sort of GIS - there you will be able to read to coordintes.

Jan

11

General / Re: Massive artifacts errors

« on: June 10, 2017, 02:06:26 PM »

Have you tested the previous PS version?

Jan

12

General / Re: Geotagging photo's on non-GPS Camera

« on: June 09, 2017, 03:36:28 PM »

Hi,
data are available here
Password is in PM.
In PS look in the Reference pane for icon "Import" (Table with a folder icon).

I have a tool called Geotility - and this is used for fast georeferencing (not ortorectifiction) of images obtained from Geosnap tool. It uses Google as basemap and it should be free (I don't remember). This tool can visualize the whole flight from a track file (that I have as well included in the sample data).

Jan

13

General / Re: Geotagging photo's on non-GPS Camera

« on: June 09, 2017, 08:12:09 AM »

Hi Bob.
We have to Pro version including the IMU unit.  We bought it about 3 years ago for about 6000€ (paid from a project).

We have it mounted on a Tetracam ADC Lite camera and it is somehow connected directly to the camera body and it's electornics. This means that camera is set to auto-trigger (every 2 seconds) and the images are stored to the camera's SD card. The GeoSnap has it's own SD card where is stored the corresponding image name together with the GPS and IMU information.

Processing is very easy as I only load the images into PS and import the GPS and IMU data in the reference pane and here we go. The accuracy is not very good (we are talking about meters) but I use it in the mountains, where signalizing and measuring GCP would be very time consuming  and regarding the resolution and the usage of the IR images I found this satisfying.

I can send you some sample data, if you are interested.

Jan

14

General / Re: How to best clean up / align data

« on: June 09, 2017, 08:02:38 AM »

OK - you may just mask-out everything but the trunk and see if it helps.
Jan

15

General / Re: DEM Errors after Merging Chunks

« on: June 08, 2017, 11:40:26 PM »

Well - do you have enough overlap in-between the chunks?
Jan