edu.umn.cs.spatialHadoop.operations

Class CatUnion

java.lang.Object

edu.umn.cs.spatialHadoop.operations.CatUnion

public class CatUnion
extends java.lang.Object

Computes the union of a set of shapes given a category for each shape. Input: - A file that contains all shapes (one per line) - A file that contains a category for each shape Output: - One file that contains one line per category. Each line contains category ID as it appears in the second file and the union of all shapes assigned to this ID

Author:

Ahmed Eldawy

Constructor Summary

Constructors

Constructor and Description
CatUnion()

Method Summary

Methods

Modifier and Type	Method and Description
static void	main(java.lang.String[] args)
static java.util.Map<java.lang.Integer,OGCGeometry>	unionLocal(Path shapeFile, Path categoryFile) Calculates the union of a set of shapes categorized by some user defined category.
static void	unionMapReduce(Path shapeFile, Path categoryFile, Path output, OperationsParams params) Calculates the union of a set of shapes categorized by some user defined category.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

CatUnion

public CatUnion()

Method Detail

unionMapReduce

public static void unionMapReduce(Path shapeFile,
                  Path categoryFile,
                  Path output,
                  OperationsParams params)
                           throws java.io.IOException

Calculates the union of a set of shapes categorized by some user defined category.

Parameters:

shapeFile - - Input file that contains shapes

categoryFile - - Category file that contains the category of each shape.Shapes not appearing in this file are not generated in output.

output - - An output file that contains each category and the union of all shapes in it. Each line contains the category, then a comma, then the union represented as text.

Throws:

java.io.IOException

unionLocal

public static java.util.Map<java.lang.Integer,OGCGeometry> unionLocal(Path shapeFile,
                                                      Path categoryFile)
                                                               throws java.io.IOException

Calculates the union of a set of shapes categorized by some user defined category.

Parameters:

fs -

file -

Returns:

Throws:

java.io.IOException

main

public static void main(java.lang.String[] args)
                 throws java.io.IOException

Parameters:

args -

Throws:

java.io.IOException