[OSRS-PROJ] Lambert Conformal Conic 1SP

[Frank Warmerdam]

Clifford J Mugnier wrote:

> In reference to the rounded-off example computations of EPSG for the
> Jamaica National Grid of 1969, for those seeking to validate
> transformations, try chasing the following decimal points:
> 
> Latitude = 17º 55'55".80 N
> Longitude = 76º 56' 37."26 W
> X = 255,966.582 m
> Y = 142,493.511 m.

Cliff,

Very interesting information, though mostly over my head.  I did try this
test point and got excellent agreement.

testepsg -t EPSG:4241 EPSG:24200 -76.9436833333 17.932166666666667
(-76.943683,17.932167) -> (255966.581853,142493.511021)

"testepsg" uses PROJ.4 to do the actual transformation but pulls the
definitions from my copy of the EPSG database.  So PROJ.4's results seem
right on for this example.

I would agree that EPSG is lacking lots of coordinate system and even
transformation methods, but it is by far the dominant defacto standard
coordinate system catalog and is the basis of many GIS systems these days.

Best regards,

-- 
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I set the clouds in motion - turn up   | Frank Warmerdam, warmerdam at pobox.com
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush    | Geospatial Programmer for Rent


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