Topics

1

General / Project snow landscape (3D model snow volume)

« on: December 27, 2022, 12:16:32 PM »

Dear Agisoft Community

I work in the field of surveying / national surveying in switzerland.

The goal of our new project is a 3D model in the mountains after fresh snowfall (Goal: 3D-Model of the surface of the snow ).
We suspect that the processing could be difficult because after fresh snowfall everything is pretty much white, without any contours.

Is such a processing even possible?

Are there any tips for data collection with the drone? camera settings?

What do we have to consider during processing (settings?) so that we recive the best results (few artifacts)?

Thank you for the feedback and help.

Tom

2

General / Effects Orthophoto

« on: October 06, 2015, 09:54:08 AM »

Hello everybody,

I have a problem to calculate orthophotos with function "mosaic". Particulary along buildings are some strange effects. Like a shadow.
The mesh in these regions looks good.

How can I solve / avoid this problem?

Many thanks

3

General / Quality Fix Calibration

« on: July 15, 2015, 10:51:52 PM »

Hello everybody,

I'm working in the field of areal photogrammerty with a multicopter and a fixed Lens (sigma 19mm F/2.80) . Until now i've used about 12 GCP for every project to calculated the values of camera calibration (optimize tool) respectively to georeference my project.
If I now export the camera values from a project (calculated with optimize tool) and than import for new projects with using "fix calibration":

Questions:
A:  Could i reduce the number of GCP Points for a project keeping same data qualitiy?

B: How can I calculate most reliably the fixed camera values
-->a) SW Agisoft Lens
-->b) with a very low fly altitude (result= detailed recordings to determine GCP)
-->c) with a fly on normal operating altitude --> about 100m

Or is it definitely recommended to calculated the camera values for every projekt new, because of the "low quality lens"?


Can anyone help?

4

General / Error "Align Photos"

« on: March 04, 2015, 10:00:28 AM »

Hello all,

I have a project with 1909 cameras (taken by drone and by hand). The object is a field with 4 houses.

I have now processed "Align Photos" (Accuracy=High, Pair Pre = Disabled, KP=60000, TP=0, Constraint = Yes ).

Most alignments seem to be good (zoom in does not work well). But a few of the pictures do not fit into the scene (false scale and fals position).

What I have to do now? Can i somehow only select and delete the incorrect pictures/points (without  processing the whole scene again).

Many Thx

5

General / Export Planar Orthophoto

« on: February 28, 2015, 01:34:00 AM »

Hello all,

following question:

How can I export from a 3D-Model (georeferenced with GCP or not) some planar Orthophotos whitch are oriented based on geometries in the model (e.g parallel to the facade,.. )?

I've tried it, but did not work (see attached files). The Orthophoto were allways upside down and from wrong side.

What is the workflow?

6

General / Features Photoscan

« on: February 12, 2015, 02:16:19 AM »

Hi all,

I work with the latest version of PhotoScan Proffessional 1.1.2 build 2014.

After my first projects I have following questions:

1) What is the exactly function of the new tool "ground altitude" in Reference Settings window? When it is useful?

2) When is the "Camera Corretion" in Reference Setings useful?

3) In one of the tutorials is shown, that for "guided marker placement" is needed to
reconstruct geometry first. I did the marker placement so far without reconstucting of geometry - and it worked.
Or what is the advantage ?

4) Process to minimicing "reprojection error" of POINT CLOUD.
Is it the idea to  thin out Point Cloud after Align Step with "Reprojektion error (Gradual selection)" tool (e.g threshold 1.0 )  THEN "Optimize Camera Alignment" THEN Again *Reprojection Error* THEN Again "Optimize Camera Alignment" ...
... and so on until the desired threshold is reached???or what is the correct order ?

many thanks for the help

7

General / Orthophoto editing Software

« on: January 09, 2015, 10:40:34 AM »

Hello all,

i'm looking for a software (free or commercial) to edit exported orthophotos - format GeoTIFF(.tif) !

The goal would be to retouch for example vehicles or people on areal orthofoto or perform color adjustments.

Does anyone have a good tip?



I'am also looking for a SW which allows to automatically improve - radiometric adjustments,...-  whole image stacks (500 pics and more) to get the best results in photoscan.
 
Many thanks for your inputs