Photos may or may not have been degraded in conversion to pdf, but
photoshop or gimp (which is free) can convert them to tiff without loss
of resolution. Tiff might be the best choice, but png or jp2000 might
be better. Look at compatibility and file size. The greoreferencing
toolbar in arcmap is handy.
The PDF situation is messy. Arcmap exports pdfs but cannot read them.
It exports georeferencing info, but who can read it/ There is a geoPDF
format and a free AdobeReader plugin for it, but it is proprietary and
incompatible with ESRI.
harvey
[email protected] wrote:
I have a friend who posed this question to me, was hoping someone with a little
more experience may help me answer.
"I have been doing a little work with the people in South
Africa using ArcGIS. They mostly use it for mapping the locations of the
dwellings that are in the surveillance site. That is, they project an
aerial photo of the land and layer the XYs of the dwellings on top. Up to
now, we have used .tiff images as the aerial background. But, these photos
are outdated (ca. 2001). We are trying to obtain new images, but they are
extremely expensive. However, we found one government office that is
willing to give us .pdf images of the land for free.
And this brings me to my question: Do you know if you can use project .pdf
images in ArcGIS? If not, is there a way to convert .pdf images to .tiff
images for use in ArcGIS? Or is there some information in "original" .tiff
images that would be lost if we obtained them from .pdfs?"
Thanks you in advance for any information,
Peter
_______________________________________________
Peter Graham
UW Sociology Department
Graduate Student
_______________________________________________
Uw-gis-l mailing list
[email protected]
http://mailman1.u.washington.edu/mailman/listinfo/uw-gis-l
--
http://gis.ess.washington.edu/
[email protected] 374 Johnson Hall 206-685-7981
Harvey Greenberg
University of Washington
Department of Earth and Space Sciences
College of the Environment
Box 351310
Seattle WA 98195-1310
_______________________________________________
Uw-gis-l mailing list
[email protected]
http://mailman1.u.washington.edu/mailman/listinfo/uw-gis-l
