Topics

1

General / calculate NDVI from ortophoto

« on: September 29, 2016, 04:40:46 PM »

Hello,
I can create an ortophoto using Photoscan.

Is it possible to get NDVI map from that ortophoto using Photoscan? If so, how can I?

thanks

2

General / photoscan export dense cloud points: what kind of coordinates?

« on: September 12, 2016, 07:09:54 PM »

Hello,
I have to export dense cloud points from photoscan.

I found several way to export points (XYZ txt, ASCII pts, WaveFront OBJ), but what are the differencies between all of them?

thanks!

3

Camera Calibration / Lens to calibrate Sequoia

« on: September 09, 2016, 08:51:35 PM »

Hello,
I'm trying to calibrate my Sequoia using Lens but, during the calibration procedure, I receive log messages like the following :

Code: [Select]

Calibrating lens...
corners hessian: 4.022 non-maxima: 0.041 correspondencies: 0.217 refine: 1.666
At least 3 photos with properly detected corners are required, calibration skipped
corners hessian: 4.091 non-maxima: 0.04 correspondencies: 0.168 refine: 1.619
At least 3 photos with properly detected corners are required, calibration skipped
corners hessian: 4.687 non-maxima: 0.045 correspondencies: 0.201 refine: 1.8
At least 3 photos with properly detected corners are required, calibration skipped
What it means? What is wrong?

Thanks a lot for your help

4

Feature Requests / How to use Sequoia calibration target with Photoscan

« on: September 07, 2016, 04:41:12 PM »

Hello,
I have a Sequoia multispectral camera.

This camera is supplied with a calibration target: the pilot should take a picture either immediately before or after the flight, and it should need to calibrate the camera with the current environmental condition (sun etc...)

I know that using softwares similar to Photoscan, one should import this image to calibrate the project... for example at the project creation.

Do you know how can I do using Photoscan?

Thanks!

5

Python and Java API / ValueError in buildOrthomosaic command

« on: June 23, 2016, 04:52:12 PM »

Hello,
I'm trying to build orthomosaic by the following statements:

Code: [Select]

curr_chunk = doc.chunks[0]

crs = PhotoScan.CoordinateSystem("EPSG::32632")

curr_chunk.buildOrthomosaic(surface=PhotoScan.DenseCloudData, blending=PhotoScan.MosaicBlending, color_correction=False, projection=crs)
but I get this error:

Code: [Select]

2016-06-23 15:39:25 curr_chunk.buildOrthomosaic(surface=PhotoScan.DenseCloudData, blending=PhotoScan.MosaicBlending, color_correction=False, projection=crs)

2016-06-23 15:39:25 ValueError: unsupported data source
Do you know where is my mistake?

thanks!

6

Python and Java API / "Gradual selection" utility in python

« on: June 22, 2016, 05:58:46 PM »

Hello,
do you know if there is a command in python to replicate the utility "Edit -> Gradual Selection..." provided into the GUI?

thanks!

7

General / process Point Of Interest (POI) images with Photoscan

« on: June 22, 2016, 05:13:23 PM »

Hello everybody,
I've to elaborate my images taken during the POI procedure with Photoscan.

I've never done it before...

During the fly I have taken the images and then I have processed them in the same usual way:

1. align
2. optimization
3. build dense cloud
4. mesh
5, texture

but I get the result in the attached image

I don't think it's good: where is my error? may someone help me?

My only idea is the "surface" value in the mesh elaboration: I put "HeightField" but maybe I should put "Arbitrary"...could it be?

THANKS!

8

General / columns name in ascii file of export points cloud

« on: June 08, 2016, 08:02:58 PM »

Hello,
exporting the points cloud I get an ASCII file.

I use these two options:

File > Export Points... > option "XYZ Points Cloud"

File > Export Points... > option "ASCII pts"

May someone tell me the meaning/name of the columns in those files?

Thank you all!

9

General / Export points cloud

« on: June 08, 2016, 02:48:04 PM »

Hello,
after having processed my photos with photoscan (I'm now working on photogrammetry), I should need to export a file to be elaborate by another software to return "level curves" and volumetric data.

Therefore I need a file containing all the points cloud (mandatory containing: altitude, latitude, longitude)

I would need to know what is the photoscan function to get this file, maybe:

File > Export Points... > save as file type "XYZ Point Cloud"

is it correct? or have I to choose another way?

thanks!
bye

10

General / what about the wording [R] beside a chunk?

« on: May 12, 2016, 04:53:34 PM »

Hello,
it happens that it appears an [R] beside a chunk, see the attached picture (chunks 2 and 3), someone know what it means?

thanks!

11

Python and Java API / python scripting for new photoscan version

« on: May 11, 2016, 12:48:51 AM »

hello,
I've to adapt some python script written for the old photoscan version (1.0.4) to the new one, but I've some issues...

In a script I have some chunks and I have to merge them, but in the new python version I don't know how to reference the merged chunk

so, first of all I align the chunks:

doc.alignChunks(doc.chunks, doc.chunks[0], method="points", fix_scale=False, accuracy=PhotoScan.HighAccuracy, preselection=True, filter_mask=False, point_limit=80000)

then merge them:

doc.mergeChunks(doc.chunks, merge_dense_clouds=False, merge_models=True, merge_markers=False)

BUT NOW, HOW CAN I REFERENCE THE MERGED CHUNK? the following statements return me error:

doc.chunk.buildModel(surface=PhotoScan.HeightField, interpolation=PhotoScan.EnabledInterpolation, face_count=PhotoScan.MediumFaceCount, source=PhotoScan.DenseCloudData)

doc.chunk.buildTexture(blending=PhotoScan.MosaicBlending, color_correction=False, size=4096)

12

General / manage with photoscan 4 simultaneous cameras

« on: May 03, 2016, 09:20:46 AM »

Hello,
I have a drone with 4 cameras (multispectral cameras: RGB, RED, GREEN, BLUE-NIR).
The work area is precision agriculture.
To give complete info, cameras are MAPIR survey1.
I shot photo sequence and finally I got 4 simultaneous photos from them for each shot.

Now I have some doubts:

1. how can I manage those photos into photoscan?

I thought to create a chunk and add all of them into (I will have 4 copies of the same area, one for each camera).
Then I thought to proceed with the usual workflow (basically: quality estimation, alignment, dense cloud, mesh, texture)
Is it correct?
Or have I to create a separate chunk for each camera and then merge them?

2. when I create the 4 XML files from LENS (one XML with calibration parameters for each camera) how can I import those into photoscan?

Many thanks in advance for your help!
m

13

General / "Geographic" type disabled into "export orthophoto" utility

« on: April 29, 2016, 06:24:35 PM »

hello,
after the "build texture" of my project I would have to create the orthophoto but I can't.
When I open the "export orthophoto" mask, I find the "Geographic" type disabled (only "planar" enabled).
I have a 64bit system
may someone help me?
thanks!
m

14

Python and Java API / how redirect messages from console to a file?

« on: April 29, 2016, 04:17:37 PM »

Hello,
I'm trying to redirect (or write) to a file, all the messages during their listing in the console...
but til now no success!!!
may someone help me?
thanks a lot!
m

PS: in few words, I'd like to insert into a script the possibility to "save all the rows of the log shown in the console pane, into a file"