Topics

16

Python and Java API / Dense cloud generate step by step by a shape grid

« on: January 20, 2018, 04:08:07 PM »

Hi,

Someone tried to write a script to divide the total area of sparse cloud in a regular grid to generate the dense cloud. Expecially to avoid loss of data in case of some problem in very long processing.

In my mind the following process will be interesting but I need some advice to write script.

- Project with sparse cloud
- Create more new chunk based on a grid (shapefile or manual input of colums and row). So the same project duplicate for N chunks but with different bounding box, each one for one field of the grid.
- Then generate dense cloud for each chunk and saving project step by step
- Merge all the new chunk and delete the intermediate chunk
- Use this complete final chunk to DEM and orto generation.

So, please, someone can help me with this idea?

Emanuele

17

General / Calculate DEM resolution

« on: November 29, 2017, 12:24:03 PM »

Hi,

i am looking for a way to calculate the possible  output DEM resolution before perform dense cloud generation. So I can decide the dense cloud quality relative to me DEM requirement and save more time possible in the generation of the dense cloud.

Someone can help me?

Thanks

Emanuele

18

General / This estimate time is realistic

« on: October 04, 2017, 12:04:16 PM »

Hi,
In the PNG file there is time estimate for the camera position estimation.
Do you think that the time expected (more than 20 days) are already realistic after the 5% of the calculation?

There are some other way to speed up the process different from change alignment accuracy from high to medium or less?


The number of image are about 9500 with a Dual Xeon and 128GB System.

Thank you so much,
Emanuele

19

General / info about report

« on: August 17, 2017, 10:05:28 PM »

Hi,
someone can explain the difference beetween the "number of image" and "camera station" in "survey data" tab of the report?

In some case I have the two number that matching...in other case small difference...and in other difference of hundread images. But in every case I have the complete model recostructed...

Thank you so much,

Emanuele

20

General / new version and Tesla

« on: July 04, 2017, 05:41:09 PM »

Hi, all.

Someone that test the new version with CUDA supports with Tesla card, noticed a significative improvement of speed?

Thanks

e

21

General / Create a DTM after classify dense cloud on 4 separate chunk

« on: April 04, 2017, 01:12:42 PM »

Hi,

I am workink on a quite big project, after aligment I divided the project in 4 different chunk to perform dense cloud generation.

Now I tring to merge chunk to generate DSM and DTm but..at 70% of the process..my pc have some problems.

i think that I can generate DSM for the 4 chunk than export and mosaic all DSM with ERDAS Image than I can reimport DSS on a merged chunk but without merging dense cloud and then generate the orthophoto.

Then I need also DTM and countour lines. I think to proceed on the same way..classify the separate dense cloud, generate DTM, mosaic all DTM in ERDAS and maybe generate countour line in ArcGIS.

my question is: Classification process in a full dataset after merging or classification on 4 different chunk results in the same datas or not? There is some statistical process that involves the full dataset at the same time?

Thank you

Emanuele

22

General / N-.PSX project for every Chunk

« on: March 07, 2017, 03:21:23 PM »

Hi,

it's possible save every chunk in a project in a new psx project for every chunk?

Thank you

23

General / HELP: time of estimation very long...

« on: December 28, 2016, 07:54:23 PM »

Hi all,

please, i attach a images where you can see time needed for estimate camera position.

I think there is same problem...some time i saw strange number but after some hour it became right...now remain strange.

Do you think this is the real time needed or not?

The dataset is about 10k images and align at medium quality...

Thank you

24

General / nvidia Tesla K80 - INFO

« on: June 17, 2016, 01:10:01 PM »

Hi,

Thanks to my Univedrsity i have the opportunity of test and maybe buy Nvidia Tesla K80 (the same card is useful for seismic data analysis)

http://www.pny.eu/consumer/explore-all-products/nvidia-tesla/277-tesla-k80

It's a good way to improve Photoscan? Step by Step i can add more Tesla card to my workstation if this is a good way

Thanks!

25

Python and Java API / import csv image in photoscan

« on: June 09, 2016, 04:29:47 PM »

Dear friends,
I need help for analyze some thermal image dataset.
I have some thousand of .CSV matrix that are a 382x288 array, where every cells are a temperature in celsius with one or two decimal data.
I need to make a photogrammetric process to my data, so i need to convert my CSV data into TIFF image (16bit - the sensor works at 12bit). So:
1 - Looking for a minimum and maximum values of temperature of all dataset of array
2 - Create a LUT where the min temp is black (0) and max temp is white (65,536)
3 - Whit this palette create a TIFF image of every CSV.
After photogrammetric recostruction I need to resample final orthoimage with the same LUT and create a 32 bit TIFF possible with radiometric information for every pixel.
Anyone know some script that can help me!?
Thank you so much..