Intengu Technologies wrote: > I have seen the following posts, > http://grass.itc.it/pipermail/grassuser/2006-May/034214.html and > http://grass.itc.it/pipermail/grass-dev/2006-June/023820.html > > 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 > images.
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." [1]. 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 > tools. >From stereo aerial imagery - Efoto [2]. It seems (just a brief check) that OSSIM [3] can make use of RPC. [1]http://www.tec.army.mil/TD/tvd/survey/SilverEye.html [2]http://www.efoto.eng.uerj.br [3]http://www.ossim.org/ Maciek _______________________________________________ grassuser mailing list [email protected] http://grass.itc.it/mailman/listinfo/grassuser
