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| GeoCommunity Mailing List |
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| Mailing List Archives |
| Subject: | [gislist] Photogrammetric corrections tools |
| Date: |
05/19/2004 11:10:01 AM |
| From: |
JuleC125 .. aol.com |
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Dear Fellow Listers
I recently purchased a popular Windows OS based raster GIS as a core of tools
to set up a small GIS services capability. I am finding that the questions
people want me to address require older aerial photography as one of the prime
input data sources. I can obtain aerial photos as digital files from the USGS
APFO and other sources. I can use common software, ie. PhotoShop, to load
and manipulate the image files for easy viewing and interpretation, even in
stereo, on-screen. I have enough computer power to easily load and manipulate
the more than three GB of data that comprises a color stereo triplet of 9x9 inch
format aerial photographs. The computer screen provides image magnification
and quality that surpasses that of the highest quality hardcopy stereo photo
interpretation stations I have ever used. Data interpretation from the
photographs is thus fairly easy. Data capture and integration into the GIS is still
problematic for me.
I have used high quality (and high cost) software such as Leica Geosystems
Orthobase Pro and Stereo Analyst. I do not need or want all the capability (or
cost) these systems provide. I need something that provides capability to
register a photograph to a map base, correcting for tip and tilt, for local
topographic relief displacement, and, possibly, for camera lens characteristics. I
want something better than "rubber sheet" correction, something that can
utilize DEM data and/or GPS data for local topographic relief displacement
correction. As an end product, I want to be able to overlay a historic photo data
file onto a DOQ and have the (large scale) photo images locally register to
those of the smaller scale geospatially accurate DOQ (and topographic map) images.
I need then to be able to save the "corrected" photo image file in a format
that can be imported into my GIS for further use.
Does anyone know of inexpensive software that can do this?
Thanks for any suggestions you might be able to provide.
Jule A. Caylor
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