orthorectification,aerial photographs

[Radoslav Bonk]

Thank you for your advice it was very clearly.
I have a small successes in my project
- have raster elevation model of desired area, even the aerial
photographs /4/ cover larger area, does it matter?
- got one aerial photograph with r.in.tiff into GRASS, just for training,
because about 0.5 cm of the photo is missing /part with fiducial marks/
- have whole camera characteristics 
- have done such as i.group, i.target ...

my guestions: Is it necessary to scan whole aerial photo, isn't it?
I'm trying to do more 
Rado Bonk              
    

*************************************************
 Radoslav Bonk
 Comenius University,Faculty of Natural Sciences
 Department of Physical Geography and Geoecology
 Mlynska Dolina 842 14,Bratislava SLOVAKIA
 e-mail: bonk at nic.fns.uniba.sk
 PRIVAT: Svinia 221, 082 32; tel:+42/91/958 187
*************************************************


On Sun, 14 Sep 1997, Schmidt wrote:

> I've had good success using r.in.gif for bringing scanned aerial photos into
> GRASS and using i.ortho.photo to perform the ortho corrections. To do the
> corrections for relief distortion, you will need a GRASS raster elevation
> map for the area. You will also need to input information on the aerial
> camera characteristics (focal length and fiducial measurements). You will
> then need to record the locations of the fuducial marks on the scanned
> photo, register the photo to some other rectified image or map, and then
> rectify it.  
> 
> If you have further questions, I will try to help.
> 
> Jim Schmidt
> avenues at sonnet.com
> 
> 
> 
> 
> 
> 
> At 06:49 PM 9/8/97 +0200, you wrote:
> >>
> >>Hi my name is Radoslav Bonk
> >>I'm working on the project where I need to put an aerial photographs
> >>strictly on a topographical map for solving the LANDUSE. It's a hilly
> >>region and it gets a quite big problems even I worked in EASI/PACE.
> >>I have no other softwares except the GRASS's tools for orthorectifying
> >>aerial photos. I need the photos orthorectify and then try to
> >>georeference them as sharp as possible on topographic maps.
> >>I have no experiences with image processing in GRASS, even i did mostly
> >>morphometric modeling and r.mapcalc modeling of soil erosion and other
> >>geomorphological hazards.
> >>
> >>my GUESTION is: 1. Are the GRASS tools for orthorectifying an aerial
> >photos suficient to get a good results?
> >                 2. What are the steps of such an image processing?
> >                 3. I have compiled r.in.tiff I think I will need it for
> >image processing. Will I?
> >                 4. Where I can find a similar project or www paper with   
> >>    solving the problems of Orthorectifying the aerial photos?
> >
> >********************************************************************
> >I would like to ask somebody for consulting this problems on the net.
> >********************************************************************
> 
> >>
> >>Thank you very much
> >>                                                 Rado Bonk
> >> 
> >>*************************************************
> >> Radoslav Bonk
> >> Comenius University,Faculty of Natural Sciences
> >> Department of Physical Geography and Geoecology
> >> Mlynska Dolina 842 14,Bratislava SLOVAKIA
> >> e-mail: bonk at nic.fns.uniba.sk
> >> PRIVAT: Svinia 221, 082 32; tel: 091/958 187
> >>*************************************************
> >>
> >
> >
> avenues at sonnet.com
>