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Posted by Murky on February 26, 2008, 4:42 am
Please log in for more thread options wrote:
> Lauren Parker wrote:
> > I have some 1m res quickbird images that I want to georeference to a
> > 10m DEM that I have projected in WSG 84.
>
> > Can anyone tell me how to go about doing this -- preferably in Arc but
> > I also can use ENVI.
>
> > The more detailed the instructions, the better.
>
> > So far I've had little luck with layer stacking in ENVI as for
> > whatever reason I can't seem to define the header correctly.
>
> I believe ENVI's layer stacking will not work if the layer are not at
> the same resolution.
>
> As for the header, pay a lot of attention on the data type you have and
> select... 95% of the bad header problems I have encountered come from ther=
e!
>
> Jean
>
> In Arc, I
>
> > thought I managed to reference the Quickbird images, but while they
> > say they are in WSG 84, they appear to show up in either Eastings and
> > Northings or in Lat-Long but under the impression that my image area
> > is in the South Pacific (I'm working with DEM and Quickbird images
> > from Mt Hood, Oregon).
>
> > Thanks
Do you just want to georeference the image or do you want to
orthorectify it?
As for the projection in ArcGIS, check first in ArcCat what the
specified coordinate system is for you data and does it make sense?
If you have a file in lon/lat but tell ArcCat that it is in a UTM then
it will look very odd. Don't forget that the coordinate system of the
data frame in ArcMap is not directly related to the coordinate system
of the layers in the frame (except for the first layer opened).
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