remove_areas.c File Reference

Vector library - clean geometry (remove small areas) More...

#include <stdlib.h>
#include <grass/gis.h>
#include <grass/Vect.h>
#include <grass/glocale.h>

Include dependency graph for remove_areas.c:

Go to the source code of this file.

Functions
int	Vect_remove_small_areas (struct Map_info *Map, double thresh, struct Map_info *Err, double *removed_area)
	Remove small areas from the map map. More...

Detailed Description

Vector library - clean geometry (remove small areas)

Higher level functions for reading/writing/manipulating vectors.

(C) 2001-2008 by 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.

Author

Radim Blazek

Date

2001

Definition in file remove_areas.c.

Function Documentation

int Vect_remove_small_areas	(	struct Map_info *	Map,
		double	thresh,
		struct Map_info *	Err,
		double *	removed_area
	)

Remove small areas from the map map.

Centroid of the area and the longest boundary with adjacent area is removed. Map topology must be built GV_BUILD_CENTROIDS.

Parameters

Map	vector map
thresh	maximum area size for removed areas
Err	vector map where removed lines and centroids are written
removed_area	pointer to where total size of removed area is stored or NULL

Returns

number of removed areas

Definition at line 41 of file remove_areas.c.

References G_debug(), G_fatal_error(), G_percent(), l, NULL, tools::size, Vect_area_alive(), Vect_delete_line(), Vect_get_area_area(), Vect_get_area_boundaries(), Vect_get_area_centroid(), Vect_get_line_areas(), Vect_get_num_areas(), Vect_line_alive(), Vect_line_length(), Vect_list_append(), Vect_new_cats_struct(), Vect_new_line_struct(), Vect_new_list(), Vect_read_line(), Vect_reset_list(), and Vect_write_line().