class WKBWriter(dim=2)
WKBWriter provides the most control over its output. By default it returns OGC-compliant WKB when its write method is called. However, it has properties that allow for the creation of EWKB, a superset of the WKB standard that includes additional information. See the WKBWriter.outdim documentation for more details about the dim argument.
The ability to pass the dim argument to the constructor was added.
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write(geom)
Returns the WKB of the given geometry as a Python buffer object. Example:
>>> from django.contrib.gis.geos import Point, WKBWriter >>> pnt = Point(1, 1) >>> wkb_w = WKBWriter() >>> wkb_w.write(pnt) <read-only buffer for 0x103a898f0, size -1, offset 0 at 0x103a89930>
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write_hex(geom)
Returns WKB of the geometry in hexadecimal. Example:
>>> from django.contrib.gis.geos import Point, WKBWriter >>> pnt = Point(1, 1) >>> wkb_w = WKBWriter() >>> wkb_w.write_hex(pnt) '0101000000000000000000F03F000000000000F03F'
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byteorder
This property may be set to change the byte-order of the geometry representation.
| Byteorder Value | Description |
|---|---|
| 0 | Big Endian (e.g., compatible with RISC systems) |
| 1 | Little Endian (e.g., compatible with x86 systems) |
Example:
>>> from django.contrib.gis.geos import Point, WKBWriter >>> wkb_w = WKBWriter() >>> pnt = Point(1, 1) >>> wkb_w.write_hex(pnt) '0101000000000000000000F03F000000000000F03F' >>> wkb_w.byteorder = 0 '00000000013FF00000000000003FF0000000000000'
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outdim
This property may be set to change the output dimension of the geometry representation. In other words, if you have a 3D geometry then set to 3 so that the Z value is included in the WKB.
| Outdim Value | Description |
|---|---|
| 2 | The default, output 2D WKB. |
| 3 | Output 3D WKB. |
Example:
>>> from django.contrib.gis.geos import Point, WKBWriter >>> wkb_w = WKBWriter() >>> wkb_w.outdim 2 >>> pnt = Point(1, 1, 1) >>> wkb_w.write_hex(pnt) # By default, no Z value included: '0101000000000000000000F03F000000000000F03F' >>> wkb_w.outdim = 3 # Tell writer to include Z values >>> wkb_w.write_hex(pnt) '0101000080000000000000F03F000000000000F03F000000000000F03F'
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srid
Set this property with a boolean to indicate whether the SRID of the geometry should be included with the WKB representation. Example:
>>> from django.contrib.gis.geos import Point, WKBWriter >>> wkb_w = WKBWriter() >>> pnt = Point(1, 1, srid=4326) >>> wkb_w.write_hex(pnt) # By default, no SRID included: '0101000000000000000000F03F000000000000F03F' >>> wkb_w.srid = True # Tell writer to include SRID >>> wkb_w.write_hex(pnt) '0101000020E6100000000000000000F03F000000000000F03F'
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