BIT2LINE

Description

BIT2LINE creates a line layer from a bitmap segment. It provides an option to omit lines on the edge of the bitmap and an option to smooth the lines.

Parameters

bit2line(fili, dbib, filo, remedge, smoothv, dbsd, ftype, foptions)

Name	Type	Caption	Length	Value range
FILI *	str	Input file name	1 -
DBIB *	List[int]	Input bitmap segment	1 - 1
FILO *	str	Output file name	1 -
REMEDGE	str	Remove outside perimeter edges from the bitmap	0 - 3	YES \| NO Default: NO
SMOOTHV	str	Smooth vectors	0 - 3	YES \| NO Default: YES
DBSD	str	Output segment description	0 - 64
FTYPE	str	Output file type	0 - 4	Default: PIX
FOPTIONS	str	Output file options	0 - 64

* Required parameter

Parameter descriptions

FILI

Specifies the name of the GDB file that contains the bitmap segment to convert.

DBIB

Specifies the input bitmap segment that contains the image to be converted to lines.

FILO

Specifies the name of the GDB file that will contain the output line segment.

REMEDGE

Specifies whether remove the outside edges (bounds) of the raster.

If YES (selected), lines are removed from the bounds of the raster when converting to lines. If NO (cleared), lines are created for the entire extents of the raster; this is the default value.

SMOOTHV

Specifies whether or not the vector data will be smoothed (corners rounded).

If SMOOTHV is set to YES, the vector lines will be smoothed. If this parameter is set to NO, the created vector lines will follow the pixel edges exactly.

DBSD

Describes (in up to 64 characters) the contents or origins of the output data.

If this parameter is not specified, a default description is generated.

FTYPE

Optionally specifies the output file format type, represented by a three- or four-letter code. The format type must be a GDB-recognized file type. If FILO specifies an existing file, FTYPE should not be specified since the existing file will be updated and its type won't be changed.

Supported file format codes include:

PIX: PCIDSK format
SHP: Shapefile format
KML: Google Earth KML format

The default value is PIX.

For a complete list of GDB-recognized file types and their codes, see GDB file formats in the Technical Reference section of the CATALYST Professional online Help.

FOPTIONS

Optionally specifies the file creation options to be applied when creating the output file. These are specific to the file format; in each case, the default of no options is allowed. FOPTIONS can be used to specify the compression schemes, file format subtypes, and other information.

Different options are available for different file types (see the FTYPE parameter). The options are described in GDB file formats in the Technical Reference section of the CATALYST Professional online Help.

For PIX format, FOPTIONS defaults to BAND.

Return Value

Returns: New segment number

Type: PCI_INT

Parameter: LASC

This function returns the number of the newly created segment.

Details

BIT2LINE creates a line vector segment from an input bitmap. The outside edge of the on pixels (i.e. values of 1) in the bitmap results in lines.

Example

Build a line segment based on the bitmap segment 12 in irvine.pix and save the vector segment to a new shapefile, RangeLandLines.shp.

from pci.bit2line import bit2line

fili     = "irvine.pix"            # input bitmap file
dbib     = [12]                    # input bitmap segment
filo     = "RangeLandLines.shp"    # output file to be created
remedge  = "YES"                   # remove the surrounding edge
smoothv  = ""                      # defaults to YES so lines are smoothed
dbsd     = ""                      # output layer description
ftype    = "SHP"                   # create a shapefile
foptions = ""                      # output format options

bit2line( fili, dbib, filo, remedge, smoothv, dbsd, ftype, foptions )

Environments	PYTHON :: EASI :: MODELER
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