topic Re: Spatial points pattern in Mapping Questions

Spatial points pattern

AnggiKusumawardani — Thu, 05 Mar 2015 02:01:22 GMT

Hi all

I have points data which represent infected palms in block plantation. I want to analyze whether the infected palms are random, dispersed, or dispersed distribution.

I thought the extension of spatial statistic in ArcInfo could help me to measure the distribution. But I doubt the result, when I creating dummy data (clearly clustered distribution) and I execute with Average Nearest Neighbor tools, the result is at dispersed distribution!

I attach my dummy data here.

If anyone could give me suggestion, it would be appreciated.

Thanks

-anggi

Re: Spatial points pattern

DanPatterson_Retired — Thu, 05 Mar 2015 02:36:58 GMT

from the average nearest neighbour how it works section,

you observed average nearest neighbours is going to be small relative to the expected

ANN = Do/De < 1 clustering, > 1 dispersed

De depends upon area... what is your area? you have a bounding rectangle but was it used as the extent for the analysis?

Re: Spatial points pattern

AnggiKusumawardani — Thu, 05 Mar 2015 02:59:27 GMT

Hi Don

Thanks for your suggestion. I have tried to execute once and in environment work, I put my extent area. It works. The result is at clustered distribution.

I thought why my first trial failed was because i didn't put my extent, I only fill the area (optional) with my hectare area.

-anggi