GRDPOL

Description

Convert polygons or arcs in vector segments to raster image or bitmap.

Parameters

grdpol(filv, dbvs, file, dboc, fldnme, algo)

Name	Type	Caption	Length	Value range
FILV	str	Input vector file name	0 -
DBVS *	List[int]	Input vector segment(s)	1 - 16
FILE *	str	Output file name	1 -
DBOC	List[int]	Output raster channel(s)	0 - 1
FLDNME	str	Field name	0 -	Default: ATTRIBUTE
ALGO	str	Algorithm	0 - 8	POLYGON | EDGEFILL Default: POLYGON

* Required parameter

Parameter descriptions

FILV

Specifies the name of the file containing the vector segments to be rasterized. If this parameter is not specified, it will be assumed to be the same as FILE.

DBVS

Specifies the vector segment(s) containing the vectors from which the raster image will be constructed.

FILE

Specifies the name of the PCIDSK image file to receive the rasterized output.

DBOC

Specifies the raster channel to receive the rasterized output image. If this parameter is not specified, an output bitmap segment is created.

FLDNME

Specifies the field name that contains the values used to grid the polygons or edges.

If this parameter is specified as ZCOORD, the actual z-coordinates of the first vertex of each vector shape are used. Field names are not case-sensitive, and they do not need to be specified in complete form. If more than one match exists, the first name is used.

If the specified attribute does not exist and it is not ZCOORD, the ShapeIDs of the vector shapes are used for gridding.

If ALGO is set to EDGEFILL, the attribute value is taken from the seed points.

ALGO

Specifies the algorithm to use when converting polygons to rasters.

Details

GRDPOL takes an input polygon segment or arcs in vector segments and converts all inside areas to a raster image.

Example

Use GRDPOL to create raster polygon coverage based on polygons stored in segment 31 of the file 'irvine.pix'.

from pci.grdpol import grdpol

filv	=	""
dbvs	=	[31]
file	=	"irvine.pix"
dboc	=	[8];
fldnme	=	""	# use default "ATTRIBUTE"
algo	=	""	# use default "POLYGON"

grdpol( filv, dbvs, file, dboc, fldnme, algo )