Messages

46

General / Re: Trouble aligning, ower water

« on: August 19, 2013, 10:06:39 AM »

Tjena George

Yes my problem is that the water look allt the same, no tiepoints. I think i need to manually add markers to images and the realign them. Wishgranter pointed this out to me, it is also in the ps manual.

I will try out the masking aswell and, another idea i have is to go back and fly at an higher alitude so land is visible on the photos. The area is an river so maybe flying at 300m would help, need to do some math.

47

General / Re: Trouble aligning, ower water

« on: August 15, 2013, 05:36:52 PM »

Anyone?

What is photoscans limit when it consider the images to be "not valid for matching"

could this value be changed?

I could edit images adding interest points but that is big work

48

General / Trouble aligning, ower water

« on: August 06, 2013, 08:54:32 AM »

I have done a survey with UAS over an area covering 2 square kilometers and the area is both water and land. Over some of the water areas photoscan has trouble aligning the images, i guess that it has to to with to little textures in the images. I guess they all look the same......

Is there a workaround or some setting i can do to improve the result. The images are all geotagged.
I have tried medium and high align setting with same result.

Maybe make two separate projects and align them with different settings and merge the later in globalmapper, or do chunks.

Here is a link to a printscreen showing the exported orto and the missing water in the top and bottom part of the orto, in the middle part there was moore movement in the water so i guess that helped.

Dropbox link
https://www.dropbox.com/s/eb7318cytert44d/River.bmp

49

General / Re: Point cloud

« on: July 05, 2013, 12:37:17 AM »

Ahh, ok. But i mean if i build geometry with, say sharp and medium will i then get dense point cloud?

Align photos stage gives sparse point cloud?

50

General / Re: Align photos

« on: July 04, 2013, 03:01:38 PM »

Hi Peter,

From what I can see the visual quality of the ortho doesn't really seem to be all that much better, if at all, when produced from a higher setting.  Although I haven't checked the geo-accuracy??

And yes, the sparse point cloud will be much larger when 'high' setting is selected.  If you are only interested in the ortho then you may be able to get away with aligning photos on low but if you are also requiring a point cloud to accurately represent the terrain you should definitely run it on high.

It does take a long time, especially with large amounts of images but that can be easily decreased by investing in some high end computer hardware.  The CPU's are dealing with Gb's of data so to a certain degree, you just have to be patient.  I would recommend dual xeon processors, good ones, if you don't already have that.

I use Phenom II X6 1055T and 16 gb ram and a geforce gtx 560 Ti.

I will look into the xenons

51

General / Re: Report values

« on: July 03, 2013, 04:33:02 PM »

Ok, thanks for quick answer

52

General / Point cloud

« on: July 03, 2013, 04:15:23 PM »

After aligning on high i get sparse point cloud, correct?
After that stage i can export points directly, are the export points settings equal to build geometry settings?

Will dense/medium pointclud export give me the same points per square meter as if i would have gone through build geometry steps?

53

General / Re: Report values

« on: July 03, 2013, 04:07:13 PM »

So after aligning photos on high and then to make report i build geometry on pointcloud i get dense values.

I remeber reading somewhere that align photos stage gives you sparse cloud

54

General / Re: Geometry type requirement for 2D orthomosaic

« on: July 03, 2013, 03:07:40 PM »

Yes Align on high and sparse pointcloud seem to do it for most cases

55

General / Re: Geometry type requirement for 2D orthomosaic

« on: July 03, 2013, 08:43:02 AM »

If i only want ortho i use point cloud geometry for export, roads can sometimes not align properly but for forestry the trees look moore natural.

Would aligning at high setting help to improve the quality of ortho when exporting with point cloud geometry?

What aligment settings do you guys use for large uav projects, over 500 pics as an example.

56

General / Report values

« on: July 03, 2013, 08:38:10 AM »

In the report there is a number that describes number of points / square meter.

Is this based on the dense point cloud?

57

General / Re: Align photos

« on: July 03, 2013, 08:37:04 AM »

Just for test i Aligned at high setting on a pretty big project, flown @ 135m with 80% overlap total of 1460 images.

Processing time for aligment right now 9 hours.

And as i said before, i can noice any difference when aligning on low, med and high.

Does this affect the number of points in point cloud?

58

General / Re: Geometry type

« on: June 10, 2013, 10:35:40 PM »

I think i found my answers in this thread.....

http://www.agisoft.ru/forum/index.php?topic=1153.msg5727#msg5727

59

General / Geometry type

« on: June 10, 2013, 04:22:26 PM »

I only want to make ortophoto, is it then ok to use Point cloud as geometry type and then export orthophoto?

It is a fast way and the orto looks nice.

If i want to add gcp for high accuracy could i still use point cloud as geometry type?

I guess there is some big difference between geometry types but will it matter for plain orto?

60

General / Re: Align photos

« on: June 09, 2013, 08:07:30 PM »

Thanks for quick answer!!

I?m currently testing and aligning 470 pic?s taken by UAV @ 150 meters and medium takes quite long time to. I run at low now and it takes about 10-20 min.

But i really cant tell any difference when looking at the orto, low vs medium.....