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From: | Jim Sutherland |
Subject: | [Info-gama] GaMa XML Input |
Date: | Mon, 01 Mar 2004 21:35:49 -0800 |
Hi Ales:
Thank you for adding me to your mailing list. I am most impressed
with your work on the GaMa project. Here is a link to a project that I am
partly involved in. We are re-engineering our legal survey plans registry
model to accept digital plan submissions. Land XML has been chosen as the
standard survey data observation information exchange format. You may find
it interesting to look at the quick overview of the project to date.
We are finalizing phase 3 of defining the detailed business and systems
architecture.
As a personal home project I have done some research on using elevated
aerial panorama's (up to 25 feet above ground level) for deriving directions
like a low accuracy theodolite. Several images are mapped together to
create an equirectangular map projection. As the image is conformal, I am
able to point to image targets (usually not more than 60 metres away) to
obtain directions from the image. I just tape distances to obtain
scale. I did some internet research and found your wonderful GaMa
program, created a 2D network and adjusted the small local
network. I am amazed at your excellent documentation. I created
the GaMa input file in a spreadsheet and ran the adjustment the first
time and discovered I had a couple of syntax errors. I re-ran the
adjustment and was very pleased with your program results and output
file. An excellent program. The adjustment shows internal
angular precision of about eight minutes sexigesimal units. The
derived directions were then compared to survey accurate measurements which
confirmed about an eight minute average accuracy for the derived
directions.
Regards,
Jim Sutherland
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