/usr/include/gmt/gmt_grd.h is in libgmt-dev 4.5.12-1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 | /*--------------------------------------------------------------------
* $Id: gmt_grd.h 10173 2014-01-01 09:52:34Z pwessel $
*
* Copyright (c) 1991-2014 by P. Wessel and W. H. F. Smith
* See LICENSE.TXT file for copying and redistribution conditions.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 or any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* Contact info: gmt.soest.hawaii.edu
*--------------------------------------------------------------------*/
/*
* grd.h contains the definition for a GMT-SYSTEM Version >= 2 grd file
*
* grd is stored in rows going from west (xmin) to east (xmax)
* first row in file has yvalue = north (ymax).
* This is SCANLINE orientation.
*
* Author: Paul Wessel
* Date: 26-MAY-1990
* Revised: 6-FEB-2006
* Version: 4.1
*/
#ifndef _GMT_GRD_H
#define _GMT_GRD_H
/* Nodes that are unconstrained are assumed to be set to NaN */
#define GRD_COMMAND_LEN 320
#define GRD_REMARK_LEN 160
#define GRD_TITLE_LEN 80
#define GRD_UNIT_LEN 80
#define GRD_VARNAME_LEN 80
struct GRD_HEADER {
/* Do not change the first three items. They are copied verbatim to the native grid header */
int nx; /* Number of columns */
int ny; /* Number of rows */
int node_offset; /* 0 for node grids, 1 for pixel grids */
/* This section is flexible. It is not copied to any grid header */
GMT_LONG type; /* Grid format */
char name[GMT_LONG_TEXT]; /* Actual name of the file after any ?<varname> and =<stuff> has been removed */
char varname[GRD_VARNAME_LEN]; /* NetCDF: variable name */
int y_order; /* NetCDF: 1 if S->N, -1 if N->S */
int z_id; /* NetCDF: id of z field */
int ncid; /* NetCDF: file ID */
int t_index[3]; /* NetCDF: index of higher coordinates */
int xy_dim[2]; /* NetCDF: dimension order of x and y; normally {1, 0} */
double nan_value; /* Missing value as stored in grid file */
double xy_off; /* 0.0 (node_offset == 0) or 0.5 ( == 1) */
/* The following elements should not be changed. They are copied verbatim to the native grid header */
double x_min; /* Minimum x coordinate */
double x_max; /* Maximum x coordinate */
double y_min; /* Minimum y coordinate */
double y_max; /* Maximum y coordinate */
double z_min; /* Minimum z value */
double z_max; /* Maximum z value */
double x_inc; /* x increment */
double y_inc; /* y increment */
double z_scale_factor; /* grd values must be multiplied by this */
double z_add_offset; /* After scaling, add this */
char x_units[GRD_UNIT_LEN]; /* units in x-direction */
char y_units[GRD_UNIT_LEN]; /* units in y-direction */
char z_units[GRD_UNIT_LEN]; /* grid value units */
char title[GRD_TITLE_LEN]; /* name of data set */
char command[GRD_COMMAND_LEN]; /* name of generating command */
char remark[GRD_REMARK_LEN]; /* comments re this data set */
};
/*-----------------------------------------------------------------------------------------
* Notes on node_offset:
Assume x_min = y_min = 0 and x_max = y_max = 10 and x_inc = y_inc = 1.
For a normal node grid we have:
(1) nx = (x_max - x_min) / x_inc + 1 = 11
ny = (y_max - y_min) / y_inc + 1 = 11
(2) node # 0 is at (x,y) = (x_min, y_max) = (0,10) and represents the surface
value in a box with dimensions (1,1) centered on the node.
For a pixel grid we have:
(1) nx = (x_max - x_min) / x_inc = 10
ny = (y_max - y_min) / y_inc = 10
(2) node # 0 is at (x,y) = (x_min + 0.5*x_inc, y_max - 0.5*y_inc) = (0.5, 9.5)
and represents the surface value in a box with dimensions (1,1)
centered on the node.
-------------------------------------------------------------------------------------------*/
/* These macros should be used to convert between (column,row) and (x,y). It will eliminate
* one source of typos and errors, and since macros are done at compilation time there is no
* overhead. Note GMT_x_to_i does not use nx but we included it for symmetry reasons.
* GMT_y_to_j must first compute j', the number of rows in the increasing y-direction (to
* match the sense of truncation used for x) then we revert to row number increasing down
* by flipping: j = ny - 1 - j' */
#define GMT_x_to_i(x,x0,dx,off,nx) ((GMT_LONG)irint(((((x) - (x0)) / (dx)) - (off))))
#define GMT_y_to_j(y,y0,dy,off,ny) ((GMT_LONG)((ny) - 1 - irint(((((y) - (y0)) / (dy)) - (off)))))
#define GMT_i_to_x(i,x0,x1,dx,off,nx) (((i) == ((nx)-1)) ? (x1) - (off) * (dx) : (x0) + ((i) + (off)) * (dx))
#define GMT_j_to_y(j,y0,y1,dy,off,ny) (((j) == ((ny)-1)) ? (y0) + (off) * (dy) : (y1) - ((j) + (off)) * (dy))
/* These macros calculate the number of nodes in x or y or the increment dx, dy*/
#define GMT_get_n(min,max,inc,off) ((GMT_LONG)irint (((max) - (min)) / (inc)) + 1 - (off))
#define GMT_get_inc(min,max,n,off) (((max) - (min)) / ((n) + (off) - 1))
/* 64-bit-safe macro to return the number of points in the grid given dimensions */
#define GMT_get_nm(nx,ny) (((GMT_LONG)(nx)) * ((GMT_LONG)(ny)))
/* Calculate 1-D index a[ij] corresponding to 2-D array a[row][col], with 64-bit precision.
* Use GMT_IJbc when array is padded by BC rows/cols, else use GMT_IJ. In both cases
* we pass the column dimension as padding is added by the macro. */
#define GMT_IJbc(row,col,nx,pad) (((GMT_LONG)(row)+(GMT_LONG)(pad))*((GMT_LONG)(nx) + (GMT_LONG)(2*(pad)))+(GMT_LONG)(col)+(GMT_LONG)(pad))
#define GMT_IJ(row,col,nx) (((GMT_LONG)(row))*((GMT_LONG)(nx))+(GMT_LONG)(col))
/* The GMT_y_is_outside macro returns TRUE if y is outside the given domain.
* For GMT_x_is_outside, see the function in gmt_support.c
*/
#define GMT_y_is_outside(y,bottom,top) ((GMT_is_dnan(y) || (y) < bottom || (y) > top) ? TRUE : FALSE)
EXTERN_MSC GMT_LONG GMT_x_is_outside (double *x, double left, double right);
EXTERN_MSC void GMT_set_xy_domain (double wesn_extended[], struct GRD_HEADER *h);
#endif /* _GMT_GRD_H */
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