Nearest Neighbour Index

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Information about Nearest Neighbour Index

Published on February 17, 2009

Author: ecumene

Source: slideshare.net

Nearest Neighbour Index Eliska NNI/Rn

What is it? Indicates spatial distribution of area-from average distance between each point and nearest neighbour 3 types of pattern: Regular Clustered Random X X X X X X X X X X X X X X X X X X X NNI=0.0 NNI=2.15 NNI=1.0 X X X X X

Indicates spatial distribution of area-from average distance between each point and nearest neighbour

3 types of pattern:

Regular

Clustered

Random

Formula NNI=2D  (N/A) D : average distance between each point & its nearest neighbour ( ∑d/N ) [ d =each individual distance] N : number of studied points A : size of the studied area ! SAME UNITS! _ _

NNI=2D  (N/A)

D : average distance between each point & its nearest neighbour ( ∑d/N ) [ d =each individual distance]

N : number of studied points

A : size of the studied area ! SAME UNITS!

Example 1-flat land Settlement Nearest Neighbour Distance (km) Cierny Majer Kosuty 1.6 Kosuty Cierny majer 1.6 Hed Cierny Brod 0.9 Cierny Brod Hed 0.9 Mostova Cierny Brod 2 Cierna Voda Cierny Brod 2.4 Stary Haj Vozokany 3 Vozokany Stary Haj 3 Degessky majer Dolna luka 3.4 Dolna luka Matuskovo 2.5 Matuskovo Budic 2.2 Budic Matuskovo 2.2 =25.7

Example 1-flat land Total=25.7 Area= 100km 2 Villages=12 NNI=2D  (N/A) 2D :25.7/12=2.14*2=4.28 NNI=4.28  (12/100) =1.48  regular A lot of free land on flat plains _ _

Total=25.7

Area= 100km 2

Villages=12

NNI=2D  (N/A)

2D :25.7/12=2.14*2=4.28

NNI=4.28  (12/100)

=1.48

 regular

A lot of free land on flat plains

Example 2-hilly land

Example 2-hilly land NNI=1.12  (23/100) NNI=0.536  clustered  regular Valleys- ecumene settlements

NNI=1.12  (23/100)

NNI=0.536

 clustered  regular

Valleys- ecumene settlements

Drawbacks ‘ straight line assumption’: on a map the distances through mountains not considered Where do you measure from? How do you determine the centre of the settlement exactly? Measure distance by road/straight line? What settlements to include? Size limit? Effect of paired distributions? Controlling factors e.g. Soil type, relief

‘ straight line assumption’: on a map the distances through mountains not considered

Where do you measure from? How do you determine the centre of the settlement exactly?

Measure distance by road/straight line?

What settlements to include? Size limit?

Effect of paired distributions?

Controlling factors e.g. Soil type, relief

Practical use? Comparison of distributions-quantifiable measure of a distribution pattern

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