Messages

16

General / Re: GSD- Ground Sample Distance

« on: February 25, 2015, 06:14:11 PM »

No one?

17

General / GSD- Ground Sample Distance

« on: February 25, 2015, 02:51:10 PM »

Hi guys.

Where in the report produced by PS is the value that represent GSD?

Thanks,

S

18

General / Re: Scale factor x y z in .las different after using subsample method

« on: December 11, 2014, 02:53:25 PM »

I don't know why CloudCompare is rescaling the data, but it's also changing the point data format. Both of these changes are going to making your las files bulkier than necessary. Even 0.001 (1mm) is too high for aerial collections. Your data probably doesn't have that level of accuracy.

I'd recommend using lastools to rescale and change the point format of your data to make it more compact.  See this lastools posting on fixing crappy las files.
 https://groups.google.com/forum/#!searchin/lastools/crappy$20las/lastools/oK81EEr7W3Y/pYBvwTzKOugJ.

Thank you for the reply.

The scale factor of x, y and z, went from 0.001 to 0.00000035632something. Does this mean that the las file can not be thrusted for applications such as volume measurements and areameaurements? Will the Las file still represent the real world measurements correctly even thoug the different scaling?

Anyone?

19

General / Scale factor x y z in .las different after using subsample method

« on: December 08, 2014, 08:09:06 PM »

Hi.

I have used cloud compare to decimate a .las point cloud. Before subsampling I have 0.001 in x y and z scale (in point cloud from PS) and after subsampling in CC I have different number on the scales. Please see attachment.

Why is this happening? What does this mean? The point cloud is georeferenced in UTM coordinates..

Anyone?

thanks, SH

20

General / Re: Big coordinates in exported .las-file, how to fix?

« on: December 08, 2014, 02:41:59 PM »

I think that version 1.1.0 will be released in the end of December.

 Ok.

Thanks

21

General / Re: Big coordinates in exported .las-file, how to fix?

« on: December 08, 2014, 02:41:23 PM »

.

22

General / Re: Big coordinates in exported .las-file, how to fix?

« on: December 08, 2014, 02:19:13 PM »

Hello Sky_hie,

Version 1.1.0 is available as pre-release from the sticky topic in General forum section:
http://www.agisoft.com/forum/index.php?topic=2883.0

Alternatively you can vary bounding box size in version 1.0.4 as dense cloud export saves only points inside the box.

Ok. When will the final be released?

Thank you for the tip With the b-box:)

Also, thank you for the support!

23

General / Re: Big coordinates in exported .las-file, how to fix?

« on: December 08, 2014, 02:08:30 PM »

Hello Sky_hie,

Unfortunately, I'm not aware of the import limits for AutoCAD.

Dense cloud could be split in blocks on export in PhotoScan version 1.1.0.

ok.

I have PS 1.0.4 Professional edition. "There is no update required" Message when checking for updates..

24

General / Re: Big coordinates in exported .las-file, how to fix?

« on: December 08, 2014, 01:52:57 PM »

Hello Sky_hie,

I can suggest to export cropped dense point cloud with small number of points and check if the issue is related to the number of points. Also you can try to export in local coordinates to check if the issue is related to the big values for the coordinates.

Seem to work when I export With local coordinate system and small number of points. I have 150 million Points in this project, do you think this too much for most programs? The las-file is 4.5 GB in size...

Also, is there a way of splitting the cloud in several parts in PS?

25

General / Re: Big coordinates in exported .las-file, how to fix?

« on: December 08, 2014, 01:31:05 PM »

Hello Sky_hie,

So I see that coordinates of the points in the system used are large. And as I've understood you need to save them in this particular system. That's why I'm little bit confused, how you can used smaller values for the same points and same coordinate system.

Alexey,

So you cannot see any obvious errors/problems in the screenshots?


When importing to external program the coordinates gets even bigger. When importing to AutoCAD I get this: "The Selected Layer States Could Not Be Restored"

Any idea?

 

26

General / Re: Big coordinates in exported .las-file, how to fix?

« on: December 08, 2014, 01:17:47 PM »

2

27

General / Re: Big coordinates in exported .las-file, how to fix?

« on: December 08, 2014, 01:16:56 PM »

Hello Sky_hie,

It seems to be correct. But if you have large values for the Easting and Northing in this system, then I'm not sure that you can avoid it, since you need these values.

Please look at the attachment

28

General / Re: Big coordinates in exported .las-file, how to fix?

« on: December 08, 2014, 01:04:48 PM »

Hello Sky-hie,

By default PhotoScan saves point coordinates in the same system that was used for chunk referencing. So if you are using UTM projections big values can be expected.

But in case georeferencing is not required for your tasks, you can use Shift fields in the Export Points dialog to remove the same big  value from all coordinates or even use Local Coordinates.

I need a georeferenced pointcloud for this task. The external program is having a hard time importing the las file.

Positional data are gathered in WGS and gcp data are in UTM. When exporting Points to las-format I choose ETRS UTM. Is this correct?

29

General / Big coordinates in exported .las-file, how to fix?

« on: December 08, 2014, 12:14:47 PM »

Hi.

When importing a .las file created in PS to a las-Viewer program I get very big coordinates. How can I avoid this?

Thanks

SH

30

General / Re: Have a aerial dataset. How to make sidewall of buildings better?

« on: September 25, 2014, 05:49:53 PM »

Hi as eddiethemartian say you used HEIGH FIELD recon mode, use AARBITRARY mode, should be much better fot this sort of datas...

The model is mainly a model of the ground. and is georeferenced. For this it is best solution to use Height Field?? and not Arbitrary..?

Build the model in "arbitrary" mode, and build the texture using "adaptive orthophoto", and you will get detail on the walls of your building.  "Height field" will not generate that detail.

This seem to work very well. Thanks