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glqgridcoord.1
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glqgridcoord.1
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.\" Automatically generated by Pandoc 2.9.2
.\"
.TH "glqgridcoord" "1" "2020-01-17" "Fortran 95" "SHTOOLS 4.6"
.hy
.SH GLQGridCoord
.PP
Compute the latitude and longitude coordinates used in Gauss-Legendre
quadrature grids.
.SH Usage
.PP
call GLQGridCoord (\f[C]latglq\f[R], \f[C]longlq\f[R], \f[C]lmax\f[R],
\f[C]nlat\f[R], \f[C]nlong\f[R], \f[C]extend\f[R], \f[C]exitstatus\f[R])
.SH Parameters
.TP
\f[B]\f[CB]latglq\f[B]\f[R] : output, real(dp), dimension (\f[B]\f[CB]lmax\f[B]\f[R]+1)
The latitude coordinates of a Gauss-Legendred quadrature grid in
degrees.
.TP
\f[B]\f[CB]longlq\f[B]\f[R] : output, real(dp), dimension (nlong)
The longitude coordinates of a Gauss-Legendre quadrature grid in
degrees, dimensioned as (2*\f[C]lmax\f[R]+1) when \f[C]extend\f[R] is 0
or (2*\f[C]lmax\f[R]+2) when \f[C]extend\f[R] is 1.
.TP
\f[B]\f[CB]lmax\f[B]\f[R] : input, integer
The maximum spherical harmonic degree that will be integrated exactly by
Gauss-Legendre quadrature.
.TP
\f[B]\f[CB]nlat\f[B]\f[R] : output, integer
The number of samples in latitude.
.TP
\f[B]\f[CB]nlong\f[B]\f[R] : output, integer
The number of samples in longitude.
.TP
\f[B]\f[CB]extend\f[B]\f[R] : input, optional, integer, default = 0
If 1, include 360 E longitude.
.TP
\f[B]\f[CB]exitstatus\f[B]\f[R] : output, optional, integer
If present, instead of executing a STOP when an error is encountered,
the variable exitstatus will be returned describing the error.
0 = No errors; 1 = Improper dimensions of input array; 2 = Improper
bounds for input variable; 3 = Error allocating memory; 4 = File IO
error.
.SH Description
.PP
\f[C]GLQGridCoord\f[R] will compute the latitude and longitude
coordinates that are used in Gauss-Legendre quadrature grids for
performing spherical harmonic transforms and reconstructions.
The latitudinal nodes correspond to the zeros of the Legendre polynomial
of degree \f[C]lmax+1\f[R], and the longitudinal nodes are equally
spaced with an interval of \f[C]360/(2*lmax+1)\f[R] degrees.
.SH See also
.PP
shglq, shexpandglq, makegridglq, shexpandglqc, makegridglqc, preglq