Category Archives: aggregation

3.4 Basic two dimensional contact process

This is an implementation of a basic contact process in two dimensions. The contact process is one of the simplest possible interacting particle systems. It is discussed in some detail in

Durrett R and Levin SA 1994b Stochastic spatial models: a user’s guide to ecological applications. Philosophical Transactions of the Royal Society of London. Series B. 343, 329-350.

Click on the image to download and save the model NetLogo file. You will need to install NetLogo to run this file.

2.7 the double Thomas point process

This model demonstrates a double Thomas point process where consecutive ‘generations’ of point events originate from the location of ‘parent’ events. Although the process is not intended as a dynamic model, it clearly shows how we can progress from a static to a dynamic model, similar to that of Flügge et al.

Click on the image to download and save the model NetLogo file. You will need to install NetLogo including the gradient extension to run this file.

2.4 the inhomogeneous Poisson process

This is model demonstrates an inhomogeneous Poisson point process in which the probability of a point event occurring varies from place to place across the area of interest.

Click on the image to download and save the model NetLogo file. You will need to install NetLogo including the gradient extension to run this file.

2.2 Flügge et al.’s spatial memory model

This is an implementation of the model described in

Flügge AJ, Olhede SC and Murrell D 2012 The memory of spatial patterns – changes in local abundance and aggregation in a tropical forest. Ecology 93, 1540-1549.

This model also requires this NetLogo source file to run. You should place this file in the same folder as the model .nlogo file.

An alternative version of the model is available, which makes use of the NetLogo R extension.

Click on the image to download and save the model NetLogo file. You will need to install NetLogo to run this file.