[GRASS-user] Create 3d models of buildings for use in Google Earth
tutey at o2.pl
Sat Aug 4 08:48:13 EDT 2007
Intengu Technologies wrote:
> I have seen the following posts,
> http://grass.itc.it/pipermail/grassuser/2006-May/034214.html and
> I have access to orthorectifed high res imagery of towns and would
> like to start creating 3d models of buildings - would actually
> prefer to automate this process as much as possible. I do not have
> access to polygons of buildings with height. Once models are created
> they will be viewed on GoogleEarth.
> On the web I found out about a product callled SilverEye from
> Geotango - has since been bought by Microsoft :( - product info
> was saying SilverEye extracts 3d building models from single scene
Only from Quickbird and IKONOS, using "a rational function model (RFM)
defined with 78 rational polynomial coefficients (RPCs). The required
RPC parameters are provided with IKONOS and QuickBird imagery." . As
I understand it, using these data orthorectification is performed and
DTM created. So the ortho image is an output, not an input.
I don't think it is possible to extract elevation from any
ortho-imagery. Ortho-image is as "flat" as any map.
> Any ideas on how I can then create 3d Models from imagery using OSS
>From stereo aerial imagery - Efoto . It seems (just a brief check)
that OSSIM  can make use of RPC.
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