[Gdal-dev] $ to apply CorMat to vector data

[Matt Wilkie]

Dear GDAL/OGR Developers,

I'm soliciting time & price estimates to develop a program to apply the 
NTDB Correction Matrices (CORMAT) to our vector data.

CORMAT is a product derived from the planimetric enhancement of NTDB 
data sets at the 1:50 000 scale. The correction matrices enable users to 
enhance the geometric accuracy of the less accurate NTDB.

Each matrix consists of a set of points arrayed on a regular 100-metre 
grid. Each point describes the planimetric correction (DX, DY) to be 
applied at this location. The position of the points is given in UTM 
(Universal Transverse Mercator) coordinates based on the North American 
Datum of 1983 (NAD83). Each file constitutes a rectangular area covering 
the entire corresponding NTDB data set. Its delimitation corresponds 
more or less to National Topographic System (NTS) divisions at the 1:50 
000 scale.

For detailed specification and sample implementation algorithm see
http://tinyurl.com/avupo (goes to
http://www.cits.rncan.gc.ca/cit/servlet/CIT/site_id=01&page_id=1-005-002-010.html) 



I asked Frank Warmerdam about developing a CorMat program. He has too 
many irons in the fire to do it himself but is confident gdal/ogr can do 
it, and that it would be *really* handy if the cormat data was in the 
same format as NTv2 datum shift info.

Basically what I want is a program I can shove a shapefile (or coverage, 
geodatabase, etc.) at and have it spit back out a corrected one. It 
needs to be script friendly -- I have over 9 thousand files to throw at 
it and I'd prefer if it ran on windows.


Also see http://yukongis.ca/bin/view/Main/CorMat


-- 
matt wilkie
--------------------------------------------
Geographic Information,
Information Management and Technology,
Yukon Department of Environment
10 Burns Road * Whitehorse, Yukon * Y1A 4Y9
867-667-8133 Tel * 867-393-7003 Fax
http://environmentyukon.gov.yk.ca/geomatics/
--------------------------------------------