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Any way to initialize mapping in IDL with WKT or a Proj.4 string? [message #93684]

Thu, 29 September 2016 15:20

Gordon Farquharson
Messages: 48
Registered: December 2010

Member

Hi All

Can anybody think of a way that will allow me to initialize the IDL mapping routines with a Coordinate Reference System Well Known Text string [1] or a Proj.4 parameter string [2]. Examples include:

PROJCS["UTM Zone 10, Northern Hemisphere",GEOGCS["WGS 84",DATUM["WGS_1984",SPHEROID["WGS 84",6378137,298.257223563,AUTHORITY["EPSG","7030"]],TOWGS84[0,0,0,0,0,0,0],AUTHORITY[ "EPSG","6326"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG", "8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG ","9108"]],AUTHORITY["EPSG","4326"]],PROJECTION["Transverse_Mercator "],PARAMETER["latitude_of_origin",0],PARAMETER["central_meridian ",-123],PARAMETER["scale_factor",0.9996],PARAMETER["false_easting ",500000],PARAMETER["false_northing",0],UNIT["Meter",1]]

and

+proj=utm +zone=10 +ellps=WGS84 +datum=WGS84 +units=m +no_defs

I want this process to work for any projections, i.e., not just UTM. I think the answer to my question lies in this last statement, namely that it is not possible, because the GCTP library does not implement all possible projections.

Sigh. Why didn't Harris/Exelis just listen to the god David Fanning, and convert IDL to use Proj.4 [3].

Probably time to write a script to parse Proj.4 strings for a few well-loved projections.

Gordon

[1] http://docs.opengeospatial.org/is/12-063r5/12-063r5.html
[2] https://trac.osgeo.org/proj/wiki/GenParms
[3] https://groups.google.com/forum/#!topic/comp.lang.idl-pvwave /JrJMvhsYB8M

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[Message index]

		Any way to initialize mapping in IDL with WKT or a Proj.4 string? By: Gordon Farquharson on Thu, 29 September 2016 15:20
		Re: Any way to initialize mapping in IDL with WKT or a Proj.4 string? By: rawahranger on Thu, 29 September 2016 21:22
		Re: Any way to initialize mapping in IDL with WKT or a Proj.4 string? By: Gordon Farquharson on Fri, 30 September 2016 14:31
		Re: Any way to initialize mapping in IDL with WKT or a Proj.4 string? By: Gordon Farquharson on Sun, 16 October 2016 19:41

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