Messages

1

General / Oblique Images

« on: March 01, 2019, 06:23:58 PM »

Good morning, would it be possible to obtain quality orthophotos using oblique images?

If I make a flight at 120 meters, with an overlap of 50 or 60% it will cover a certain width.

If I use 2 cameras with an angle of 30 ° between them, it would be possible to double the arc to be raised, sacrificing the resolution.

I'm in the middle, something is failing in the theory.

Attach an image.

Thanks

2

General / Quality point cloud reconstruction?

« on: November 30, 2015, 03:43:15 PM »

Hello. On one occasion I read in this forum that photogrammetric surveying, it was not recommended to generate the point cloud to highest quality, but do not remember the argument.

Is this true ', why?

Cheers

3

General / Error rebuilding walls and ceilings

« on: November 11, 2015, 10:39:54 PM »

Hi, I have taken photos to 150 m high, with an equivalent resolution of 3.8 cm per pixel.

The point cloud is processed the high resolution (in ultra high the problem remains the same, but to a lesser extent).

The mesh is built in maximum density and optenido have this problem in the walls and roofs of houses.

On roads, trees and other elements we have not had any problems.

Anyone have any idea how to fix it.?

The image is attached

Cheers

4

General / network processing speed

« on: June 08, 2015, 05:29:12 PM »

Suppose we have a i7 last generation, and processes a batch job at a time X.

If we put two i7 computer network, the processing time will be reduced by half ?.

And with 3 computers, will be 3 times faster?

It is unlikely to be so, anyone know what the real relationship?

regards

5

General / quality dense point cloud

« on: May 13, 2015, 01:39:59 AM »

Hello.

To generate orthophotos and DTM, which recommend quality to create the dense cloud of points ?.

I have always used the highest quality, but in a previous question one of the software developers told me that was exes.

regards

6

General / Re: errors in the photos. Why?

« on: April 22, 2015, 07:27:19 PM »

Hello.

I have not made manual filtering of points, the area is very large, and mistakes like that wall are repeated frequently

The red line of the box limit is parallel to the point cloud. I used more than 20 ground control points for this flight.

Because it is not recommended to process in ultrahigh?

The surface consists of:

Faces 57192920
vertices 28624041

regards

7

General / Re: errors in the photos. Why?

« on: April 21, 2015, 04:47:56 PM »

Hi.

parameters are used to process:

Aling Photos: High

Build Dende Point Cloud: Ultra high
Depth filtering: moderate

Build Mesh: 

Surface Type: Heigth field
Source data: Dense cloud
face count: 0

Build texture:

Mapping mode: generic
blending mode:  mosaic
texture size count: 40960 x 1


I hope that these data are useful to understand the problem.

Thank you for taking the time to respond

8

General / Re: decimating point cloud

« on: April 21, 2015, 04:41:15 PM »

Hi

Also works great recap Autodesk.

I wanted to decimate the cloud PhotoScan, to perform the classification of the points most agile.

The 64 gb of ram that I have, are not sufficient to classify the dense cloud of points.

Thank you all for your interest and time spent responding

9

General / errors in the photos. Why?

« on: April 21, 2015, 02:28:08 AM »

Hi, I made a flight with 60% of lateral overlap and 80% along the flight line.

The GSD is 3.8 cm, the report can observe that the image points can be observed in more than 9 pictures.

Doubt is because such errors, like the attached picture is obtained.

It is possible to improve this result?

Thank

10

General / decimating point cloud

« on: April 17, 2015, 11:57:27 PM »

Hello, I created a model from 500 images taken from a UAV.

I created a dense cloud of points in Superexcellent quality containing 1,100,000,000 points.

These points are too many for me, but if quality process in a inferiror I will obtain errors that are not admissible.

You may decimate the point cloud before being exported ?.

regards

11

General / Big Data Project

« on: December 18, 2014, 07:14:12 PM »

Hello, I have on the horizon a relatively big job.

A 5500 images and have available 2 computers for you project.

What would be the most efficient way?

I understand that I can do batch processing on a PC, but you can process files on separate machines and finally unite into one big file.

regards

12

General / Change in coordinate system

« on: December 01, 2014, 06:42:18 PM »

hello

I could georeference each of my photos using the onboard GPS.

The problem is that the onboard GPS recorded in geographical coordinates, and ground control points have them recorded in UTM.

By changing the coordinate system, after making alignment and insert the ground control points, do not fall into the position they should.

Then I select them manually, picture by picture without knowing if they are close or not.

You can align the photos on geographical coordinates, and then transform the model to UTM coordinates to locate much easier checkpoints?

regards

13

General / Re: Camera Shutters and lens

« on: October 19, 2014, 07:01:22 PM »

hello, thanks for the prompt reply

I read in a forum that the nex five can not take pictures at a lower rate of 2.2 seconds when the infrared trigger is used.

So I doubt if it is possible to take continuous pictures with the nex 7 1 second

Thank

14

General / Camera Shutters and lens

« on: October 19, 2014, 12:45:48 AM »

Hi, i have a nex 7 and i like know how take aerial photo every 1 second.

is it posible with a IR shutter

What lens recomend us for aerial photogrammetry

Thank

15

General / Re: 3930k vs 3820?

« on: October 02, 2014, 01:29:56 AM »

hi Alexey Pasumansky

I do not have Respla the above process, just enter the final time to estimate the times.

If Raedon is faster than the GTX, GTX recommends that PhotoScan series?

The time of 48 h or so I got it with a gtx 670.

I have disabled 2 cores of my processor 12.

greetings