Topics

1

General / Rapid Orthomosaic

« on: May 24, 2022, 12:55:42 PM »

Hi everyone,

I am looking for a method to generate a quick orthomosaic, so color can be checked and adjusted prior to the final mosaic.

I have 5400 images from FujiFilm GS100 100 MegaPixels)

I have psx project with 1100 of the 5400 images. It is aligned, optimised, Dense Pt Cld, Mesh, all ready to go to mosaic - that takes 7 hours.
But the colors differences between images are large due different dates, sun-angle, atmospheric conditions, etc.

I made some low resolution images, and made a new psx with those.
I did the  usual process and could generate a low-res mosaic in 2 minutes

I would like to import the EO (XYX/OPK.csv) from the accurate high-resolution psx - in place of the whole allign/optimise etc process with the low-res images

I hope to import and accept the EO
Also import a mesh or DEM, create a camera calibration, then run mosaic

But not sure how to tell metashape to accept the imported EO.


MetaSHape 1.7.5 build 13229 (64 bit)

regards

Murray

2

General / Steresocopic 3D mapping hardware

« on: February 28, 2022, 07:36:09 AM »

Hello everyone

I am using Metashape for processing vertical aerial photographs over 10 000 to 100 000 hectares.
We then export the cameras to Summit format and create Stereo 3D projects for mapping forests and vegetation, amongst other features.

I'm interested in hardware and software for stereoscopic 3D mapping, linked to GIS. 
I have been using Summit Capture for ArcGIS along with NVIDIA StereoVision 2 active LCD glasses with compatible monitor/graphics card.
But.... it's getting old and I may have to replace the whole set up soon.

Does anyone have suggestions for a new stereo 3D mapping setup?

Regards
Murray

3

General / Assign Imported DEM height values to dense point cloud

« on: October 23, 2020, 05:52:44 AM »

Hello,

(Agisoft Metashape Professional 1.6.1 build 10009 64 bit)

I am processing aerial photography and have generated a dense point cloud.
I have imported a Lidar DEM.

Can I assign height values from the Lidar DEM, to the dense point cloud?
Then subtract DEM values from dense point cloud z-values to determine height above DEM/ground?
I would then like to use the height above ground to classify ground and near-ground points.

Cheers
Murray

4

General / Point Cloud height above ground

« on: March 18, 2019, 11:24:08 AM »

Hello,

How can I assign height above ground to the MetaShape point cloud?  I have generated a dense point cloud. I have an accurate Lidar DTM. Can I assign DTM value to points? 

In Forestry, LAStools does a process called "normalize" where the ground elevation is subtracted from the Point Cloud elevation so the point cloud represents height above ground - which is the height of trees.  This is an essential step for forestry information from point clouds - can MetaShape produce normalised Point Cloud?

thanks
Murray

5

General / Dense Cloud Display colors

« on: February 27, 2019, 02:52:53 AM »

Hi,

I have a dense point cloud derived from four band imagery. The point cloud is displayed as grey scale. The points have been colorized using Tools/Dense Cloud/Colorize dense cloud. I want to see the color of the points - Can the display of the point cloud be altered to show RGB color?

Regards
Murray

6

General / Mask Mesh build

« on: December 13, 2018, 05:37:58 AM »

Hello,

I am using Photoscan for an aerial photo project. The triangulation results are good, I've created a dense point cloud.

I want to build a mesh and PS reports that it will take 3 days.  But, I only really need a small area.  How do I limit the mesh build to be only a selected area?

I have manually selected points from the dense point cloud using the Model/free-form selection tool, reversed the selection, and deleted those points.  That works, I do get a mesh limited to the area of interest. 

However, I cannot automate that process. 

Can Photoscan:

     - import a shapefile to select points from dense point cloud?
or
     - use a shapefile to constrain the area for mesh build?

or does someone have a better method?

cheers
Murray

7

General / Process four band images

« on: November 30, 2018, 10:23:32 AM »

Hi everyone,

i have some four band tiffs RGBI, and I want to produce four band orthomosaic and point clouds with RGBI colours.  Is this possible in PhotoScan? 

Is the process different to the RGB process?

cheerio

MurrayW