adj_cellhd.c File Reference

GIS Library - CELL header adjustment. More...

#include <math.h>
#include <string.h>
#include <grass/gis.h>
#include <grass/glocale.h>

Include dependency graph for adj_cellhd.c:

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Macros
#define	LL_TOLERANCE   10

Functions
void	G_adjust_Cell_head (struct Cell_head *cellhd, int row_flag, int col_flag)
	Adjust cell header. More...
void	G_adjust_Cell_head3 (struct Cell_head *cellhd, int row_flag, int col_flag, int depth_flag)
	Adjust cell header for 3D values. More...
int	G_adjust_window_ll (struct Cell_head *cellhd)
	Adjust window for lat/lon. More...

Detailed Description

GIS Library - CELL header adjustment.

(C) 2001-2009 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

Original author CERL

Definition in file adj_cellhd.c.

Macro Definition Documentation

LL_TOLERANCE

#define LL_TOLERANCE   10

Definition at line 19 of file adj_cellhd.c.

Function Documentation

G_adjust_Cell_head()

void G_adjust_Cell_head	(	struct Cell_head *	cellhd,
		int	row_flag,
		int	col_flag
	)

Adjust cell header.

This function fills in missing parts of the input cell header (or region). It also makes projection-specific adjustments. The cellhd structure must have its north, south, east, west, and proj fields set.

If row_flag is true, then the north-south resolution is computed from the number of rows in the cellhd structure. Otherwise the number of rows is computed from the north-south resolution in the structure, similarly for col_flag and the number of columns and the east-west resolution.

Note: 3D values are not adjusted.

Parameters

[in,out]	cellhd	pointer to Cell_head structure
	row_flag	compute n-s resolution
	col_flag	compute e-w resolution

Definition at line 51 of file adj_cellhd.c.

References _, Cell_head::cols, Cell_head::ew_res, G_fatal_error(), Cell_head::north, Cell_head::ns_res, Cell_head::proj, PROJECTION_LL, Cell_head::rows, and Cell_head::south.

G_adjust_Cell_head3()

void G_adjust_Cell_head3	(	struct Cell_head *	cellhd,
		int	row_flag,
		int	col_flag,
		int	depth_flag
	)

Adjust cell header for 3D values.

This function fills in missing parts of the input cell header (or region). It also makes projection-specific adjustments. The cellhd structure must have its north, south, east, west, and proj fields set.

If row_flag is true, then the north-south resolution is computed from the number of rows in the cellhd structure. Otherwise the number of rows is computed from the north-south resolution in the structure, similarly for col_flag and the number of columns and the east-west resolution.

If depth_flag is true, top-bottom resolution is calculated from depths. If depth_flag are false, number of depths is calculated from top-bottom resolution.

Warning

This function can cause segmentation fault without any warning when it is called with Cell_head top and bottom set to zero.

Parameters

[in,out]	cellhd	pointer to Cell_head structure
	row_flag	compute n-s resolution
	col_flag	compute e-w resolution
	depth_flag	compute t-b resolution

Definition at line 165 of file adj_cellhd.c.

References _, Cell_head::cols, Cell_head::cols3, Cell_head::depths, Cell_head::ew_res, Cell_head::ew_res3, G_fatal_error(), Cell_head::north, Cell_head::ns_res, Cell_head::ns_res3, Cell_head::proj, PROJECTION_LL, Cell_head::rows, Cell_head::rows3, Cell_head::south, and Cell_head::tb_res.

G_adjust_window_ll()

int G_adjust_window_ll

(

struct Cell_head *

cellhd

)

Adjust window for lat/lon.

This function tries to automatically fix fp precision issues and adjust rounding errors for lat/lon.

Note: 3D values are not adjusted.

Parameters

[in,out]

cellhd

pointer to Cell_head structure

Returns

1 if window was adjusted

0 if window was not adjusted

Definition at line 553 of file adj_cellhd.c.

References _, Cell_head::east, Cell_head::ew_res, G_fatal_error(), G_lat_format(), G_lat_scan(), G_llres_format(), G_llres_scan(), G_lon_format(), G_lon_scan(), Cell_head::north, Cell_head::ns_res, Cell_head::proj, PROJECTION_LL, Cell_head::south, and Cell_head::west.