[GRASS-user] Draping of Raster images

[Anna Hodgkinson]

Hi,

I tried r.to.rast3elev, however, that creates 3D volumes, rather than surfaces, doesn't it? And nviz has problems displaying those, I've never managed it.

Yes, I would like to "drape" a flat 2D raster image over 3D raster surfaces or vector data. However, I would like to retain that elevation information, basically create a 3D (or 2.5D) raster image from a flat one.


Here's the case study:
I have a flat satellite image for my site.
I also have topological survey data, in the shape of a points vector layer, with z-values in the attribute table. I have a 3D layer of the same, created by using v.to.3d
I furthermore have an interpolated raster surface from the points survey data, which is 2.5D.

I would now like to drape the 2D satellite image over either the vector points or their interpolated surface and thus create a 2.5 / 3D version of the same satellite image, which I can then visualize in 3D, standalone.

Many thanks!

Anna


----- Original Message -----
From: "Markus Metz" <markus.metz.giswork at googlemail.com>
To: "Anna Hodgkinson" <anna.hodgkinson at thehumanjourney.net>
Cc: "grass-user grass-user" <grass-user at lists.osgeo.org>
Sent: Thursday, 3 November, 2011 2:45:18 PM
Subject: Re: [GRASS-user] Draping of Raster images

On Thu, Nov 3, 2011 at 3:32 PM, Anna Hodgkinson
<anna.hodgkinson at thehumanjourney.net> wrote:
> Thank you, but neither of those would work for me - what I'm trying to
> do is to make a 2D raster image 3D.
> And I don't mean visualisation, I mean assigning cell values for
> elevation from either another 3D surface or vector layer (both of
> which I have).

Do you mean something like r.to.rast3elev?
http://grass.osgeo.org/grass64/manuals/html64_user/r.to.rast3elev.html

The link you gave only shows how to drape a 2D raster over elevation,
it does not show how to assign z-coordinates and create a 3D raster.

Maybe the confusion goes away if you could explain what you want to do
with the 3D raster.

Markus M

>
> Sorry!
>
> Anna
>
>
> ----- Original Message -----
> From: "Saber Razmjooei" <razmjooeis at faunalia.co.uk>
> To: "Anna Hodgkinson" <anna.hodgkinson at thehumanjourney.net>
> Cc: "Saber Razmjooei" <razmjooeis at faunalia.co.uk>, "grass-user
> grass-user" <grass-user at lists.osgeo.org>
> Sent: Thursday, 3 November, 2011 2:21:23 PM
> Subject: Re: [GRASS-user] Draping of Raster images
>
> Alternatively, you can use:
>
> r.shaded.relied
>
> That will be 2D only.
>
>
>
>
>> Thanks, but there doesn't seem to be a way of elevating a 2D raster
>> surface. Do you have any experience with this, and would know what
>> command to use?
>>
>> Many thanks,
>>
>> Anna
>>
>>
>> ----- Original Message -----
>> From: "Saber Razmjooei" <razmjooeis at faunalia.co.uk>
>> To: "Anna Hodgkinson" <anna.hodgkinson at thehumanjourney.net>
>> Cc: grass-user at lists.osgeo.org
>> Sent: Thursday, 3 November, 2011 1:52:36 PM
>> Subject: Re: [GRASS-user] Draping of Raster images
>>
>> This page might be helpful:
>>
>> http://grass.osgeo.org/wiki/Help_with_3D
>>
>>
>> Cheers
>> Saber
>>
>>> Dear all,
>>>
>>> I was wondering whether it is possible to use GRASS to drape raster
>>> images over existing 3D surfaces or vector layers.
>>>
>>> I know ArcGIS is capable of this, is seems a fairly straight-forward
>>> procedure there
>>> (http://webhelp.esri.com/arcgisdesktop/9.3/tutorials/3D_analyst/3D_5.htm),
>>> so I was hoping to achieve the same using open source GIS.
>>>
>>> GRASS has a v.drape module, which can drape vector layers over 3D
>>> surfaces, NVIZ seems to do the same.
>>>
>>> It would be great if someone could tell me that GRASS (or any other
>>> open source GIS package) is capable of draping raster images over
>>> either other
>>> rasters or vectors containing elevation information.
>>>
>>> Many thanks and all the best,
>>>
>>> Anna
>>>
>>> ______________________________________________ Anna Kathrin
>>> Hodgkinson MA MSt (Oxon) AIFA EES
>>> Supervisor Geomatics
>>>
>>> Oxford Archaeology: Exploring the Human Journey
>>> Mobile: +44 (0)7906 638308 (personal)
>>> Direct Dial: +44 (0)1865 980 855
>>> http://thehumanjourney.net
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