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Messages - stihl

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General / Re: dense point clouds and depth filtering
« on: December 20, 2014, 05:23:39 AM »
Interesting results.

May I ask at what limit did you set the tie-points at for aligning?
Also what are the images resolution and how many tie points were found in each image on average?

General / Re: Big Data Project
« on: December 18, 2014, 11:50:26 PM »
Shouldn't be an issue if you do some effective pre-processing and make sure to slice the project into chunks for processing. With one computer with hardware worth about 4 thousand dollars I've processed a single aerial project that consisted of over 80.000 images. If you chop it up and manage it well all it takes is some time.

I wouldn't unite or merge chunks in Photoscan. Instead export them individually and merge into a sophisticated GIS program like GlobalMapper.

General / Re: scale does not export
« on: December 16, 2014, 12:33:55 AM »
I think you need to optimize it first for it to keep that scale. Did you do that?

General / Re: Problem with align of forested images
« on: December 10, 2014, 09:27:05 PM »
Are those the original images? As in are the made photographs 800x600?

General / Re: Aerial Photogrammetry Phantom 2
« on: December 09, 2014, 04:28:42 PM »
It's important to fly at the same height over the terrain. This allows you to keep the same GSD throughout the project so some portions of the model do not look less detailed than others.

The best is to fly in a lawnmower pattern like this:

General / Re: Aligning points - point limit
« on: December 08, 2014, 05:46:16 PM »
I'm not sure why the default is set to 40 thousand points. I've seen other photogrammetry software that used anywhere between 20k and much much more.

I've tried aligning aerial projects with the maximum number of tie points (setting the value to 0 will do this) and it will find roughly between 200k and 300k tie points per photo. This means that the aliginment takes longer, but I've also noticed that the dense point stage takes far less time. I assume because it has less space to fill in. I've also noticed that the geometry is more complete if the pictures are clear and sharp if I use the maximum tie points allowed.

General / Re: TLS file format
« on: December 05, 2014, 09:50:02 PM »
Hi Darko.

I wasn't aware of any TLS file format. Nor did I find any information about it on the web nor could I find any export options regarding 'TLS' in Photoscan...

Did you mean Tiles instead?

General / Re: DEM
« on: December 03, 2014, 05:11:51 PM »
What you need is GIS software.

Try GlobalMapper, it's free to try as far as I know. It can calculate volumes in a DEM depending on a set height, average ground height or actual ground height.

It should also solve your coordinate issue with the TIFF.

General / Re: Change in coordinate system
« on: December 02, 2014, 12:15:13 PM »
What you need to do is convert the WGS84 GPS coordinates from your onboard GPS in your device to the UTM that your ground control points use.

What CRS are your GCP's in?

General / Re: GPU processing failed
« on: December 01, 2014, 02:54:39 PM »
Oh that's unfortunate....

In that case I'm out of options. The only ones I can find for your card are v.344.xx which I assume produces these failures. :-\

General / Re: GPU processing failed
« on: December 01, 2014, 11:57:39 AM »

Yea that's due to a driver issue. Because the GPU fails during the dense cloud process it reverts back to the CPU which is immensely slower for this step than the GPU.

The solution is to roll back to driver version 337.88.

General / Re: Aerial Photogrammetry Phantom 2
« on: November 18, 2014, 06:31:52 PM »
Hello all,

Just some quick questions regarding ortho photo workflows. I'm a beginning photoscan pro user and have had some success at producing orthos with the phantom 2 vision + (that's why I'm posting here BTW). I'll have access to RTK GPS in a few weeks so I can produce GCPs. However, at present I am wondering if the following is possible without GPS:

1. Can markers be placed to help the alignment of photos so as to fix some minor issues like straightening out rooflines and vehicles (sometimes cars look like shit)? Can these markers be placed and utilized for this purpose without GPS coordinates?

2. Can the scale bars be used in a similar fashion, by placing markers without GPS coordinates, and with photos taken from the phantom 2 vision +?

3. And finally, does the phantom's onboard camera record GPS altitude? I ask because in looking at the EXIF files I only see lat and long (been wanting to know this for some time).

Any help would be greatly appreciated - just steer me in the right track. I'm very interested in learning more about better flightpath software and techniques for mapping with this phantom 2 vision +. Thank you.
Hi Jim,

To answer your questions;

1) Markers can be placed to help  the alignment of the Ortho image. Preferably what you want is both GPS flight positions from the UAV and GCP's measured with RTK GPS. It can be done without flight positions but then you need an extensive GCP network as well to prevent the model from bending.
GCP's will not noticably help with artifacts that you see on building edges and other height objects. The only solution for that is extensive noise filtering (artifacts show up because of irregular height data near edges) but this is time consuming and annoying. I prefer other software to create aesthetically pleasing Orthomosaics.
They can't be added without GPS information. What you mean are manual tie points which Photoscan is unable to do so as far as I know.

2)Scalebars can only scale the model. It can't position it relative to the real world nor can it say anything about it's absolute orientation.

3) If you don't see height in the EXIF data it's safe to assume that it doesn't log it. Only way to go around is to manually add the height if you know the flying height during that time. Of course the height varies during the flight so you can't use the model that's generated this way for it's heights unless you add accurate GCP's and have it optimized just on the GCP's.

I believe under Tool > Camera calibration you can enter the fixed focal length in the top right of the camera calibration window.

General / Re: Memory consumption for EXPORT TILES
« on: November 16, 2014, 09:38:03 PM »
Can you give us some more information?

What're you exporting? Pointcloud, DEM, Ortho..and in what format.

You said you've tried exporting in tiles? How big were the tiles? I've succesfully exported ortho images based on a pointcloud with over 2 billion points (high mesh) with a tile size of 20k pixels by 20k pixels based on a GSD of 5cm, which gives you tiles of 1km by 1km.

General / Re: Dell Workstation Configuration help!
« on: November 05, 2014, 11:58:08 AM »

SSD's tend to get much less reliable after continuous heavy use. For me reliability and data loss preventage is much more important than any performance gain by a SSD. Unless you don't have enough ram, the SSD is barely used during processing. If you run out of ram it uses it as a scratch-disk which can be harmful to the device in the long run.

So unless you're running projects that run out of RAM regulary and you're unable to get more, a SSD should be fine. Kind of depends on what you're working with.

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