point2d.c File Reference

#include <stdio.h>
#include <math.h>
#include <unistd.h>
#include <grass/gis.h>
#include <grass/vector.h>
#include <grass/dbmi.h>
#include <grass/interpf.h>

Include dependency graph for point2d.c:

Go to the source code of this file.

Macros
#define	POINT2D_C

Functions
int	IL_check_at_points_2d (struct interp_params *params, struct quaddata *data, double *b, double *ertot, double zmin, double dnorm, struct triple skip_point)

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)

modified by McCauley in August 1995

modified by Mitasova in August 1995, Nov. 1996

Copyright

(C) 1993-2006 by Helena Mitasova 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 point2d.c.

Macro Definition Documentation

POINT2D_C

#define POINT2D_C

Definition at line 33 of file point2d.c.

Function Documentation

IL_check_at_points_2d()

int IL_check_at_points_2d	(	struct interp_params *	params,
		struct quaddata *	data,
		double *	b,
		double *	ertot,
		double	zmin,
		double	dnorm,
		struct triple	skip_point )

Checks if interpolating function interp() evaluates correct z-values at given points. If smoothing is used calculate the maximum error caused by smoothing.

ertot is a RMS deviation of the interpolated surface.

Todo

Alternative description: ...calculate the maximum and RMS deviation caused by smoothing.

Parameters

data	current region
b	solution of linear equations
ertot	total error
zmin	min z-value

Definition at line 52 of file point2d.c.

References b, Cats2, count, driver2, err(), ff, G_debug(), G_fatal_error(), Map2, quaddata::n_points, Pnts, quaddata::points, r, sql2, triple::x, quaddata::x_orig, quaddata::xmax, triple::y, quaddata::y_orig, quaddata::ymax, and triple::z.