interp2d.c File Reference

#include <stdio.h>
#include <math.h>
#include <unistd.h>
#include <grass/gis.h>
#include <grass/raster.h>
#include <grass/glocale.h>
#include <grass/bitmap.h>
#include <grass/interpf.h>

Include dependency graph for interp2d.c:

Go to the source code of this file.

Macros
#define	CEULER   .57721566

Functions
int	IL_grid_calc_2d (struct interp_params *params, struct quaddata *data, struct BM *bitmask, double zmin, double zmax, double *zminac, double *zmaxac, double *gmin, double *gmax, double *c1min, double *c1max, double *c2min, double *c2max, double *ertot UNUSED, double *b, off_t offset1, double dnorm)

Detailed Description

Author

Lubos Mitas (original program and various modifications)

H. Mitasova, I. Kosinovsky, D. Gerdes, D. McCauley (GRASS4.1 version of the program and GRASS4.2 modifications)

L. Mitas, H. Mitasova, I. Kosinovsky, D.Gerdes, D. McCauley (1993, 1995)

modified by McCauley in August 1995

modified by Mitasova in August 1995, Nov. 1996

bug fixes(mask) and modification for variable smoothing Mitasova (Jan 1997)

Copyright

(C) 1993-1999 by Lubos Mitas and the GRASS Development Team

This program is free software under the GNU General Public License (>=v2). Read the file COPYING that comes with GRASS for details.

Definition in file interp2d.c.

Macro Definition Documentation

CEULER

#define CEULER   .57721566

Definition at line 48 of file interp2d.c.

Function Documentation

IL_grid_calc_2d()

int IL_grid_calc_2d	(	struct interp_params *	params,
		struct quaddata *	data,
		struct BM *	bitmask,
		double	zmin,
		double	zmax,
		double *	zminac,
		double *	zmaxac,
		double *	gmin,
		double *	gmax,
		double *	c1min,
		double *	c1max,
		double *	c2min,
		double *	c2max,
		double *ertot	UNUSED,
		double *	b,
		off_t	offset1,
		double	dnorm
	)

Calculates grid values for a given segment

Calculates grid for the given segment represented by data (contains n_rows, n_cols, ew_res,ns_res, and all points inside + overlap) using solutions of system of linear equations and interpolating functions interp() and interpder(). Also calls secpar() to compute slope, aspect and curvatures if required.

ertot can be also called RMS deviation of the interpolated surface

Parameters

data	given segment
bitmask	bitmask
zmax	min and max input z-values
zmaxac	min and max interp. z-values
gmax	min and max interp. slope val.
c1max	min and max interp. curv. val.
c2max	min and max interp. curv. val.
UNUSED	total interpolating func. error
b	solutions of linear equations
offset1	offset for temp file writing

Definition at line 61 of file interp2d.c.