PROJ4

2008-05-02T12:56:17Z

192.168.30.40: PROJ4 - Cartographic Projections library

This section explains how to use PROJ4 library from Fortran.
[http://proj.maptools.org/ PROJ4] is a Cartographic Projections library originally written by Gerald Evenden then of the USGS. This library has almost all projection types.
Fortran wrapper code was developed as part of the [http://www.cbcb.umd.edu/software/glimmer/ GLIMMER] project and can be found in [http://forge.nesc.ac.uk/download.php/10/libfproj4-1.0.tar.gz libfproj4-1.0.tar.gz].

==Compilation==
===UNIX===
Just follow the instructions.
===Windows===
*Download [[\\kepler\Software\PROJ4\libfproj4.lib]] for Compaq Visual Studio, or
*Compile W32 static lib:
*#Extract proj4 source code and configure it (bash configure).
*#New project W32 static lib
*#Add fort-proj.c (from libfproj4-1.0.tar.gz) and all *.c files (from proj4 source), except all that have main function : css2css, geod, nad2bin, nad2nad, proj.c.
*# Project Settings / C/C++ / General / Preprocessor definitions : VISUAL_CPLUSPLUS ou IFORT
*# Project Settings / C/C++ / Preprocessor / include : whatever\proj-4.6.0\src (the folder that has projects.h, because of directives #include <projects.h>)

==Test Fortran API==
===UNIX===
*pgf95 -g -o libfproj4_teste.exe libfproj4_teste.f90 /home/jjdd/Downloads/libfproj4-1.0/libfproj4.a -lproj -lm

===Windows===
*Files needed: libfproj4.lib, proj4.inc, proj4.f90, test-proj.f90
#New Fortran console application
#add fortran files
#project settings:
## Link / Input / Obj/library modules : libfproj4.lib
## Link / Input / Additional include path : path to libfproj4.lib and proj4.inc)

==Ellipsoids==
*List of ellipsoids in PROJ4: proj -le
*More popular:
**International 1909 (Hayford) intl a=6378388.0m b=6356912m rf=297.
**New International 1967 new_intl a=6378157.5m b=6356772m
**WGS 84 WGS84 a=6378137.0m b=6357002m rf=298.257223563
**Normal Sphere (r=6370997) sphere a=6370997.0m b=6370997m

b = a*(1-f) = a*(1-1/rf)

==Portuguese Coordinate Systems in PROJ4==

===Portuguese Military Coordinates (Hayford-Gauss Military System)===

*Projection: Gauss-Kruger
*Ellipsoid: Hayford (internacional 1924): a=6378.388Km, b=6356.912 Km
*Datum : Lisbon (Castelo S.Jorge: 38º42’43.631’’N, 9º07’54.862’'W, 111.229m)
*Central Point: 39º40’N, 8º07’54.862’’W
*Origin: -200Km horizontally and -300 Km vertically
*Usage:
**'''+init=epsg:20790''' <=> +proj=tmerc +lat_0=39.66666666666666 +lon_0=-8.131906111111112 +k=1.000000
+x_0=200000 +y_0=300000 +ellps=intl +pm=lisbon +units=m +no_defs no_defs <>
**'''+init=esri:102164''' <=> +proj=tmerc +lat_0=39.666666667 +lon_0=-8.131906111 +k=1.000000
+x_0=200000.000 +y_0=300000.000 +ellps=intl +units=m (no reference to Lisbon Datum!!)

===Universal Transverse Mercator (zone 29N)===

*Usage:
**ModuleHorizontalGrid: '''+init=esri:32629''' <=> +proj=utm +zone=29 +ellps=WGS84 +datum=WGS84 +units=m

=External Links=
*[http://proj.maptools.org/ PROJ4]
*[http://forge.nesc.ac.uk/download.php/10/libfproj4-1.0.tar.gz libfproj4-1.0.tar.gz].
*[http://www.isa.utl.pt/dm/sigdr/sigdr04-05/9_SistRefPortugueses.ppt Sistemas Referencia Portugueses]
*[http://dl.maptools.org/dl/omsug/osgis2004/PROJ4_HandlingCoordinateSystems.pdf PROJ4_HandlingCoordinateSystems.pdf]
*[http://www.posc.org/Epicentre.2_2/DataModel/ExamplesofUsage/eu_cs34.html Projections and Projected Coordinate System Formulas]

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PROJ4