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)
int	IL_write_point_2d (struct triple point, double err)
	A function to write out point and deviation at point to database.

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, interp_params::create_devi, interp_params::cv, err(), interp_params::fi, IL_write_point_2d(), interp_params::interp, quaddata::n_points, quaddata::points, r, triple::x, quaddata::x_orig, interp_params::x_orig, quaddata::xmax, triple::y, quaddata::y_orig, interp_params::y_orig, quaddata::ymax, and triple::z.

IL_write_point_2d()

int IL_write_point_2d	(	struct triple	point,
		double	err
	)

A function to write out point and deviation at point to database.

Parameters

point	point to write out
error	deviation at point

Returns

1

Definition at line 163 of file point2d.c.

References Cats2, count, db_append_string(), db_close_database(), db_execute_immediate(), db_get_string(), DB_OK, db_shutdown_driver(), db_zero_string(), driver2, err(), ff, G_debug(), G_fatal_error(), GV_POINT, Map2, Pnts, sql2, Vect_append_point(), Vect_cat_set(), Vect_reset_cats(), Vect_reset_line(), Vect_write_line(), triple::x, triple::y, and triple::z.

Referenced by IL_check_at_points_2d(), and IL_check_at_points_2d_cvdev().