Messages

76

General / Re: vertical accuracy of a points cloud

« on: August 09, 2011, 04:05:27 AM »

Hi Mike

We found in some places they ranged between 0.50 m to 1 meter, no more than that.
But like I said before, I think this could be better with a proper giroestalized plataform.
The surface you talking about it is the place we flew or the mesh surface?
- place was in a disaster area and we has 5 to 600 meter altitude;
- mesh: medium and smooth.

Well, in this week we are setting a stabilized plataform and hopefully we gonna fly in a mountain and highway places and after that check the planialtimetric acuracy.

I would like to know from PS guys, Alexey and others, if they did some tests about this matter.

By the way Diego, you said something about filtering, could you please pm about it?

Cheers,

Fabricio

77

General / Re: vertical accuracy of a points cloud

« on: August 07, 2011, 04:13:42 PM »

I think I can help you with a case.

I a recent project using this:

- a Canon EOS 5D MK II with a fixed 35 mm lens;
- flying 1.500 feet above ground (500 meters);
- using ground control points with geodesic GPS - 1 to 2 cm acuracy;
- 10 cm pixel size.

The planimetric acuracy was 10-15 cm and the vertical was between 50 cm  to 1 meter.

We found the vertical could be better because it didn?t have a proper girostabilized plataform on our helicopter. We are working on this at moment to have a better acuracy.

If you are using a small format camera like Canon, Nikon, etc, be careful to use a full frame camera, it will have a better geometry.
Another thing we tested and I call tell you it is true: do 70% overlap between photos and 30%-35% side track. It will give a better vertical acuracy, even for a medium format camera like Hasselblad or Leica.

I hope to helped you.

Cheers

Fabricio

78

General / Re: Best PC configuration for PhotoScan ?

« on: August 04, 2011, 08:17:19 PM »

Thanks Wishgranter.

Your help will be very useful!

Fabricio

79

General / Re: Best PC configuration for PhotoScan ?

« on: August 04, 2011, 05:59:02 AM »

Hi guys

I am considering to invest in the best PC to run our jobs. Mostly are aerial and the average amount are 500-700 photos by project, but we are aiming to run 1.000 to 2.000 at once, even 4.000...
And the most important thing: deliver fast product to our customers.
Figure the scenario: I flew today, I have highest precison GPS for telemetry. And my goal is to deliver to customer in 2-5 days, no longer!
So if you could set up a thing to run this what would be?
Our target to invest is about 10.000 US$, but the most important is the configuration.
If you have idea about MAC it will be nice too...

Cheers!

Fabricio

80

Feature Requests / Re: Custom colour ramps and lighting positions

« on: July 22, 2011, 04:13:39 AM »

I would really love those features!

Bring it on!

Fabricio

81

General / Slope volume

« on: July 07, 2011, 10:21:03 PM »

Hi guys

I have some slope volume to calculate, but PS doesn?t do because this is not a close feature.
I would like to know how to setup a box and close in the area of interest or which solution are you doing about this.
In the attached image you will know what I am talking about.

Thanks in advance.

82

General / Re: Face counter number

« on: July 07, 2011, 08:36:16 PM »

Hi Chad

Pretty much you are talking about, 16 G and 2 T in HD.
I am looking for some a special computer with 4 i7 core and 48-96 G RAM. My clients need some faster delivery...

Cheers.

83

Feature Requests / Aerotriangulation graphic and acuracy quality.

« on: July 01, 2011, 04:47:05 PM »

Hi

I would like to have a aerotriangulation graphic of the points and the frame camera, mainly for aerial imagery.
Other thing it would be nice if when you export the xyz omega phi kappa data is to able to run it in a adjustament software like Aerosys or other package to see the acuracy quality of the measuraments.
This is because some of my contractors require both those information, and would be nice if it could have it.

Thanks.

84

General / Re: Face counter number

« on: July 01, 2011, 04:28:13 PM »

Very nice to hear from you.

But of your experiences what are doing regarding this?
I mean, how many face counter are you setting?

Thanks in advance.

85

General / Face counter number

« on: June 30, 2011, 09:16:28 PM »

Guys

I am facing this situation:

I have some large sets of photos, some of more than 200 imagery, each one with 21.1 megapixel and I always think the 200.000 face counter number is somewhat limiting.
I mean, I want to know how to setup this for the aerial photos because the DEM is required to have very realistic details.
For terrestrial photogrammetric data set I realized this is not a big issue, except if your set is as large as aerial.
I did a test this past weekend setting this to 0 to a set with 116 imagery and gave a outstanding 13 milion vertices and took 89 hours to render. And quite a heavy data to deal. But very realistic one.
I understand you can decimate this, and I do that, but what is the ideal number to set before you do the decimate?

I hope to hear from you soon.

Fabricio

86

General / Re: Photoscan vs laser scanner - lidar

« on: June 23, 2011, 05:51:19 PM »

@ fpbv: Well, I am currently testing some software packages myself to do some advanced filtering: Meshlab, Geomagic and Rapdiform. When I have some results, I'll try to report on them;

Cheers,

Geert
[/quote]

Hi Geert

Very nice to hear from you. I hope to read your paper soon. Like I said earlier my customers want to know more about acuracy, because the visual aspect is amazing, quite fit their needs.
About filtering I am testing Meshlab, but I think your insights will be nice to everyone. My main concern about PS is some my mesh there a lot BIG holes and some noises on it.

Thanks!

fpbv

87

General / Re: Photoscan vs laser scanner - lidar

« on: June 21, 2011, 04:58:58 AM »

Hi Geert

Very nice to know about that. I?ve been using this Canon EOS 5D MK II 21.1 megapixel with a 35 mm fixed lens. I already use it to do aerial photos and produce orthophotos with great results. Since I got PS Professional I got some very impressive results, very dense point clouds because I always use 60%-80% overlap between photos, both aerial and terrestrial. I mean, it is a lot of photos but why not?
I am a cartographer engineer here and I always worked with traditional photogrammetric-GIS-GPS systems, but LiDAR I worked once, so this dense point clouds is somewhat new to me, because in the past years I am working as project manager, not so much in technical side of the things.
But I am fascinated about this technology, opens a new ground, new ways to produce maps and such. And PS is just a great piece of software, I can tell you.
By the way, I need more information about filtering, can you give me some more help on this? If you want pm me.
Thanks again.

88

General / Photoscan vs laser scanner - lidar

« on: June 20, 2011, 05:48:36 PM »

Hi guys

I am getting amazing results using PS, really. But some of my customers are getting somewhat persistent regarding acuracy. They want to know how this compare to high end terrestrial AND aerial laser scanner - lidar. They love the final product we deliver but they want to know about how this will meet their acuracy needs. Since we do ground control surveying, both to terrestrial and aerial purposes and we show the RMS they are fine, but some questions regarding how many points, how dense this is, etc. is getting a little headache.
I would like to have some technical advice on this because I am struggling to find a proper answer. If you have sugestions on links or books it will be nice.
Thanks in advance.

89

General / Re: Video presentation

« on: June 14, 2011, 10:09:11 PM »

I am on PC. I will try this one.

Thanks!

90

General / Video presentation

« on: June 14, 2011, 09:11:30 PM »

Hi guys

I would like a little help from you.

I have to do a video presentation for a customer regarding all the dense cloud points using photos, etc.
My goal is to show the Photoscan workflow, but I never did something like this.
There?s a lot videos on youtube showing the process but I need to do this by myself.
Which software can I do that?

Thanks in advance.