cl-postgis - library for encoding/decoding to/from Well-Known Binary format. Also library supports PostGIS EWKB.

DEPENDENCIES:
 ieee-floats (built-in)
 flexi-streams

USING

Library supports following PostGIS types:

POINT
LINSTRING
POLYGON
MULTIPOINT
MULTILINESTRING
MULTIPOLYGON
GEOMETRYCOLLECTION

Functions for decoding:

(decode octets)
Decode from wkb sequence
(decode-from stream)
Decode from wkb stream

Functions for encoding:

(encode object endianness)
Encode object to vector

(encode-to object stream endianness)
Encode object to stream with endianness