# Packages
Package buffer define geomtry matrix conversion.
Package calc methods and parameters be realized ouble precision calculation.
Package filter Define data filter function.
package graph the graph to describe the hierarchical relationship between geometric objects.
Package matrix Define spatial matrix base.
Package measure Define spatial measurement function.
Package operation define valid func for geometries.
Package overlay the spatial geometric operation and reconstruction between entities is realized.
Package relate the criteria for judging the various topological relations between points, line and surface entities in DE-9IM model are given.
Package sharedpaths Computer returns a collection containing paths shared by the two input geometries.
Package subdivision a topological subdivision to support creating triangulations and Voronoi diagrams.
# Functions
Error create new error by object.
ErrorDimension create new ErrorDimension by object.
ErrorShouldBeLength9 create new ErrorshouldBeLength9 by object.
ErrorUnknownDimension create new ErrorUnknownDimension by object.
ErrUnknownType ...
# Variables
ErrBoundBeNil ...
ErrComputeOffsetZero ...
ErrNilSteric ...
ErrNotGraph ...
ErrNotGraphCollection ...
ErrNotInSlice ...
ErrNotMatchType ...
ErrNotSupportCollection ...
ErrQuadrant ...
ErrWrongExponent ...
ErrWrongFractionRange ...
ErrWrongLink ...
ErrWrongTolerance ...
ErrWrongUsageFunc ...