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Messages - fpbv

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General / 3D mesh on Facebook
« on: July 10, 2012, 10:59:25 PM »
Hi guys

Anyone knows or has any idea how to upload a 3D mesh on Facebook?

Thanks in advance.

General / Re: Import into Blender
« on: July 10, 2012, 06:37:42 PM »
Hi Mike

I tried without luck... ;D
I need to know more about how to handle Blender and those other mesh editing softwares...

General / Re: Import into Blender
« on: July 09, 2012, 04:21:50 PM »
I tried this but my mesh didn?t work any good. I would like to more about that.

General / Re: Scanning a water body
« on: July 09, 2012, 04:15:41 PM »

I did a river a couple months ago and to have fully working I did 70% overlap along track and 30% across-track.
My only problem was I did the mask on the river but it didn?t close the hole on the river.

General / Re: Scanning a water body
« on: July 06, 2012, 04:05:20 PM »

Did you said for bathymetric solutions???
I?ve been looking for this for the last week for a client and I am very interested on this kind of solution.
I hope to hear more about this.


General / Re: DTM and DSM for forestry
« on: June 11, 2012, 05:04:35 PM »
Hi guys

First of all, I must apologize to everybody because I don?t want to offend anyone here.
If I did, I am truly sorry.
I agree with Geert regarding passive and active data. Lidar is very nice for forestry but is a LOT expensive, at least here in Brazil. Believe me.
My client has some low budget so I tried to get some different solution.
Unfortunaly my time to research is very limited so I asked for this.
I already download the LAS Tools but I couldn?t find a way to work properly.
If anyone wants to process some forestry data generated by PS I can send to test.
Just pm and I will put on DropBox.

Thanks in advance.

General / Re: DTM and DSM for forestry
« on: June 05, 2012, 04:01:07 AM »
Dear Geert

First of all, thanks again for your reply.
Just let me say, in my 14 years as cartographer engineer working and dealing with mapping - aerial and terrestrial photogrammetric, topographic and GPS survey, GIS projects, and now working as consultant for many customers as diverse like mining, forestry, urban cities, agricultural and environment, it is very interesting how come a simple question turn out to weird path.
I assume most of the users of PS know the big difference between laser vs pixel data.
I?ve been looking for a just a alternative solution or, let me say, a better idea to how to overcome this.
When I talk about the las format is because it is a standard format sponsored by ASPRS and ISPRS, as simple as that.
I like when people wants to help others, and I would like to think you wanted to do this.
But I don?t think a lecture on us about the pixel, laser, etc is necessary, or better, the way you put.
Again, I would like to think you are helping us but not in those "kind" terms you put.
Everybody here is dealing with new technologies every day and some of us are dealing with old and new mapping projects techniques for the last 14 years.

I hope is clear now.

General / Re: DTM and DSM for forestry
« on: June 05, 2012, 02:06:43 AM »

First of all, thanks for reply.
I already worked with lidar data for forestry and I know how good this is.
I would expect some kind of filter to do it like lidar does, some software to do this DTM filtering.
Since PS export data for las format I thought some other software could do that.
If not, I will have to do in a stereoscopic way, which is, in this case, not a good ideal situation.

General / DTM and DSM for forestry
« on: June 04, 2012, 07:14:55 PM »
Hi guys

I have this situation.
My client has a large forestry areas and they want the DTM of it.
I show them the DSM that PhotoScan did in some photos we had in other forestry areas and they liked.
But they want to have the DTM beyond the DSM, because they need to extract the countour lines on the ground, this is more important to them.
So anyone had some idea to do it?
I know aerial laser scan do this but I don?t know how to extract this using PS.
I figured it could to apply mask on the forestry areas (pinus and eucalyptus) and generate the DTM on the ground, but it is quite time consuming.

General / Re: What Vertical Accuracy Should I get?
« on: May 26, 2012, 06:36:20 PM »

It depends of a lot factors, such:

- lens: fixed or zoom;
- flying height above ground;
- final user: civil engineering, forestry, mapping, etc;
- which accuracy are you expecting;
- contour lines: 1 m, 5 m, 10 m,
- no a troubled flying with a lot inclination...

The camera you got the imagery is very good, it has some good capabilities, but like you saw the altimetry it is the main concern.
For planimetry is fine, but you should expect no more than 12cm  to 16 cm.
You can have it good altimetry but you should look at all those things.
As soon you tell us about all this so we can find properly what is wrong.


General / Re: True 3D web presentation of Pscan outputs
« on: May 24, 2012, 05:19:14 AM »
Very good!

I will research on this.

General / Re: Post-processing data
« on: May 21, 2012, 11:23:43 PM »
Yes, pm and I will add anyone that wants this.

General / Post-processing data
« on: May 21, 2012, 10:09:53 PM »
Hi guys

I don?t remember if this was asked before, but here it goes.

I am dealing most of time with aerial photos and some geological stuff.
For cities orthophotos and DEM are nice and my clients are happy with this.
But I notice in most of times, especially in urban areas, buildings borders are not this straight.
I would like to have a help to use a post-processing software/procedure to improve this.
I have a data set (large one) available to anyone that want to try on this.
And I have on big problem: most of times roads have some strange data, like they are made on gel...
So I need to fix that.
Most of time I use medium/high and height field to my data and some work fine, others not.
Anyway, anyone could help me on this?

Bug Reports / Re: DTM -32767 values
« on: May 21, 2012, 04:51:57 PM »
Thanks Alexey

But is there a way to find this NoData values on the DEM?
I mean, how to fix this before export DEM?
Now I use that Quantum GIS way to solve, just convert the DEM to GDAL format and convert the -32767 values to 0.
It is not a tough issue procedure, but you always get more files than necessary.

Bug Reports / DTM -32767 values
« on: May 16, 2012, 08:45:47 PM »
Hi guys

In the last version when you go to Export DEM has a box that says "Crop invalid DEM"
I check this all the time but my Geotiff files always comes with this values.
It give me a lot headaches to fix this in ArcGIS.
Any help?

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