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## NetLogo User Community Models

## WHAT IS IT?

This model is simulating interactions among households located into a spatially defined residential block who are influenced by its neighbors to upgrade the construction state of its houses. It tries to explain the process called consolidation where independent households construct their houses across states ( A, B, C, and D), and along a long term period of time until they finally reach completion.

## HOW IT WORKS

It is very simple cellular automata model; cells represent houses and households who are influenced by its neighbors (located in rook configuration). Influence rule states that if an cell has a state value that is less than the average value of its neighbors it upgrades, if not state is kept. Rule test these condition each time per a single cell. The rule selects randomly each cell in order to be tested.

## HOW TO USE IT

Setup requires to define either the block size (number of houses), and the composition of states in the block. At the begining only two states are present A and B. If it is necessary values can be showed by activating the switch.

## THINGS TO NOTICE

Trajectories of each of four considered states are ploted. Ths simulation usually stops at an intermediate period before all houses reach the most developed state (D). Some times the algorithm allows all the cell to reach completion. Any case the model is designed to show the initial stages of consolidation as they can be observed in the empirical data used to validate the outputs.

## THINGS TO TRY

Moving the above-mentioned slider show the influence that both block size and initial composition have in the final value of time-steps.

## EXTENDING THE MODEL

Code can be extended by changing the type of neighborhood configuration that surrounds the cell, from rook to queen configuration.

## NETLOGO FEATURES

(interesting or unusual features of NetLogo that the model uses, particularly in the Code tab; or where workarounds were needed for missing features)

## RELATED MODELS

(models in the NetLogo Models Library and elsewhere which are of related interest)

## CREDITS AND REFERENCES

This model has been built by Victor Pena-Guillen, PhD student at the University of Tsukuba, as part of its Doctoral research on urban sprawl at the outskirts of Lima metropolitan area. Any question o comment is welcomed, please contact me at: victorpg@lamolina.edu.pe