Potential addition of CalCOFI Line/Station coordinate system #135
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Modified by warmerdam on 21 Feb 2012 05:28 UTC |
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Comment by warmerdam on 21 Feb 2012 05:38 UTC I have attached the change as a patch against trunk. |
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Comment by warmerdam on 22 Feb 2012 17:01 UTC |
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Comment by edweber on 23 Feb 2012 05:48 UTC |
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Comment by warmerdam on 9 Jul 2013 03:42 UTC Note that the ProjList page is a wiki, so you can add your new page of docs yourself. |
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Attachment added by edweber on 13 Jan 2012 18:59 UTC |
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Attachment added by edweber on 13 Jan 2012 19:00 UTC |
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Attachment added by edweber on 13 Jan 2012 19:00 UTC |
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Attachment added by edweber on 13 Jan 2012 19:00 UTC |
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Attachment added by edweber on 13 Jan 2012 19:01 UTC |
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Attachment added by warmerdam on 21 Feb 2012 05:38 UTC |
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Attachment added by edweber on 23 Feb 2012 05:28 UTC |
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Attachment added by edweber on 23 Feb 2012 05:28 UTC |
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Attachment added by edweber on 23 Feb 2012 05:30 UTC |
Reported by edweber on 13 Jan 2012 18:58 UTC
I am writing to ask if you would consider adding a pseudo-projection to the Proj4 library -- the Line/Station coordinate system of the California Cooperative Oceanic Fisheries Investigations program. The California Cooperative Oceanic Fisheries Investigations program, known as CalCOFI, is a joint
research program between the U.S. NOAA, University of California Scripps Oceanographic Institute, and California Department of Fish and Game. It is unique in that it has been collecting oceanographic and fisheries data together for more than sixty years, long before any other marine program was doing ecosystem-type studies. The CalCOFI line/station coordinate system is now used by several other programs on the U.S. west coast and by the Mexican Investigaciones Mexicanas de la Corriente de California program offshore of Baja California.
The CalCOFI line/station system is not really a projection in the sense that it's used for navigation or anything, just to indicate sample locations. It's really just a Mercator transform that is rotated -30 degrees to orient with the coast, and then units are changed. There is a full description of the system in this article:
http://www.calcofi.org/publications/calcofireport/v20/Vol_20_Eber___Hewitt.pdf
(although it has a few typos).
The addition would admittedly benefit a relatively small number of users but it's also a small amount of code. It would be a big improvement for us here at the Southwest Center because we use Proj as part of the R package "rgdal"extensively. Being able to use line/station coordinates in the standard spatial classes and functions in R is really nice. We also use the pyproj Python module and a little bit of GRASS.
I coded this as "+proj=calcofi" using the proj-4.7.0 source code but, to be honest, I have just learned enough C to do the job. I confirmed that it converts from lat/long to line/station and back correctly and consistently. However, if you were to agree to add the conversion, I think I would need someone to take a quick look to be sure the code is ok and some instructions on how to formally test and include this. The code is in PJ_calcofi.c, and then I added the "projection" to pj_list.h line 19, ../src/Makefile.am line
33, ../src/Makefile.in lines 64, 267, and 438, and ../src/Makefile.vc line 18. Thank you for your time and consideration.
Best regards,
Ed
Edward D. Weber, Ph.D.
Research Fisheries Biologist
NOAA Southwest Fisheries Science Center
8604 La Jolla Shores Drive
La Jolla, CA 92037-1508, U.S.A.
(858) 546-5676
ed.weber@noaa.gov
Last Modified by warmerdam on 21 Feb 2012 05:28 UTC
Migrated-From: https://trac.osgeo.org/proj/ticket/135
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