Modelos Hidrologicos:
Runoff
Pedro Ribeiro de Andrade
Gilberto Camara
How can geospatial data feed CA models?
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Grid of cells
Neighbourhood
Finite set of discrete states
Finite set of transition rules
Initial state
Discrete time
Brazil 2000
Espinhaço Range
Minas Gerais State
2000
Serra do Lobo
Pico do Itacolomi
do Itambé
Serra do Lobo
Pico do Itacolomi
do Itambé
rain
rain
rain
Pico do Itacolomi do Itambé
Serra do Lobo
N
A very simple runoff model
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Grid of cells
Neighbourhood
Finite set of discrete states
Finite set of transition rules
Initial state
Discrete time
Acessing a cell space in a database
host = "gis-bigdata.uni-muenster.de”
user = "terraview",
password = "terralib”
database = “cabeca”
cells = CellularSpace {
dbType = "mysql",
host = "gis-bigdata.uni-muenster.de",
database = "cabeca",
user = "terraview",
password = "terralib",
theme = "cells90x90",
select = {"height_ as height", "soilWater"},
autoload = true}
Grid of Cells – Height
Initial state – Rain in the heighest cells
1000mm of rain in the cells above 200m height
Neighborhood – based on height
48
34
37
25
30
33
23
21
34
Neighborhood – based on height
48
34
37
25
30
33
23
21
34
Note that the process takes place in parallel in space
States and transitions
Dry
Wet
 What is the behavior of each state?
 Are both states necessary?
Relaxing cellular automata definitions
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Grid of cells
Neighbourhood (not fixed)
Finite set of discrete states
Finite set of transition rules
Initial state (geospatial data)
Discrete time
Questions
 How to verify whether the model is correctly
implemented?
 What are the limitations of this model?