Segregation_DC_1.nlogo

extensions [gis]

globals [ dc-dataset ]


patches-own [
  ID     ;;patch ID is identical with polygon ID_ID
  popu          ;;population
  mycolor      ;;its color
  myneighbors  ;;neighboring polygons' centroid patches
]

turtles-own[
  tcolor
  percentage-same   ;;percentage of same color turtles on neighbors
  happy?   ;;happy if neighboring same color agents >= 50%
  tneighbors   ;;an agentset of its neighbor turtles
  rneighbors   ;;number of red neighbors
  bneighbors   ;;number of blue neighbors
  tneighborpolygons  ;;neighboring polygons' centroid patches
]


to setup
  ca
  reset-ticks
  set dc-dataset gis:load-dataset "data/DC.shp"  ;;loading the vector data of DC

  gis:set-world-envelope gis:envelope-of dc-dataset


  ;;drawing map
  foreach gis:feature-list-of dc-dataset  [
    feature ->
    if gis:property-value feature "SOC" = "RED" [
      gis:set-drawing-color red  gis:fill feature 2.0
    ]
    if gis:property-value feature "SOC" = "BLUE" [
      gis:set-drawing-color blue  gis:fill feature 2.0
    ]
    if gis:property-value feature "SOC" = "UNOCCUPIED" [
      gis:set-drawing-color grey  gis:fill feature 2.0
    ]
  ]

  gis:set-drawing-color white
  gis:draw dc-dataset 1

  ;; Each polygon identifies a patch at its centroid, which is used to
  ;; record the color and population here

  let n 1 ;; This is used so that the centre patches have an ID

  foreach gis:feature-list-of dc-dataset [

    feature ->

    ;; Find the centroid of the polygon
    let center-point gis:location-of gis:centroid-of feature

    ;; Get the separate x and y coordinates from the (x,y) pair
    let x-coordinate item 0 center-point
    let y-coordinate item 1 center-point

    ;; Get the patch at those coordinates
    ask patch x-coordinate y-coordinate [

      ;; Set it's ID
      set ID n

      ;; Set it's colour, using the value stored in the polygon
      set mycolor gis:property-value feature "SOC"

      ;; (Create an agent at the patch. This is used for verification)
      if mycolor != "UNOCCUPIED" [
        sprout 1 [
          ht
          set tcolor [mycolor] of myself setcolor
        ]
      ]

    ]
    set n n + 1 ;; Increment the ID counter
  ]

  ask patches with [ID > 0] [
    set myneighbors n-of 0 patches ;;empty agentset
  ]

  ;; Find neighbors of each polygon using a txt file produced by
  ;; ArcGIS Polygon Neighbors function.
  ;; Please read NETLOGO FEATURES in info tab for more information.
  file-close
  file-open "data/neighbors.txt"

  while [not file-at-end?] [
    let x file-read let y file-read
    ask patches with [ID = x ] [
      set myneighbors ( patch-set myneighbors patches with [ID = y ] )
    ]
  ]
  file-close

end

to setcolor
  if tcolor = "RED" [set color red]
  if tcolor = "BLUE" [set color blue]
end

to go
  move
  ask patches with [ID > 0] [if count turtles-here > 1 [print "ERROR"]]  ;;verification
  update-colors
  tick
  if count turtles with [happy? = true] = count turtles [stop] ;;stops the model when all agents are happy
end



to move

  ;;count the number of red or blue turtles in neighboring polygons
  ask turtles [
    set tneighbors turtles-on [myneighbors] of patch-here
    set tneighborpolygons [myneighbors] of patch-here
    set bneighbors count tneighbors with [tcolor = "BLUE"]
    set rneighbors count tneighbors with [tcolor = "RED"]]

  ;;calculate the percentage of same color turtle
  ask turtles [
    ifelse rneighbors + bneighbors = 0 [set percentage-same 1][
      if tcolor = "RED" [set percentage-same rneighbors / (rneighbors + bneighbors)]
      if tcolor = "BLUE" [set percentage-same bneighbors / (rneighbors + bneighbors)]]
    ifelse percentage-same < (Percentage-same-to-be-happy / 100) [set happy? false][set happy? true]
  ]


  ;;move to an unoccupied polygon if not happy. change the color here.
  ask turtles [
    if happy? = false and count tneighborpolygons with [mycolor = "UNOCCUPIED"] > 0 [
      ask patch-here [set mycolor "UNOCCUPIED"]
      move-to one-of tneighborpolygons with [mycolor = "UNOCCUPIED"]
      ask patch-here [set mycolor [tcolor] of myself]
    ]
  ]

end


to update-colors ;; Update polygon colors
  ;; Patches with an ID > 0 are those that represent the centroids of polygons
  ask patches with [ID > 0][
    ;; Find the polygon that has its centroid within this patch
    let poly item ( ID - 1 ) ( gis:feature-list-of dc-dataset )

    if mycolor = "RED" [
      gis:set-drawing-color red
      gis:fill poly 2.0
    ]
    if mycolor = "BLUE" [
      gis:set-drawing-color blue
      gis:fill poly 2.0
    ]
    if mycolor = "UNOCCUPIED" [
      gis:set-drawing-color grey
      gis:fill poly 2.0
    ]
  ]

  gis:set-drawing-color white
  gis:draw dc-dataset 1
end


to export

  ;; This function creates a text file for the color information of the current map.
  file-close
  file-delete "data/result.txt" ;; Delete the old file, if one exists
  file-open "data/result.txt"   ;; Open a new file to save the results to
  file-print "ID_ID,SOC\r\n"    ;; First write the header. This is just the ID and colour.

  ;; Now loop over each polygon and write its ID and colour
  let i 1
  while [i <= 188] [  ;; There are 188 polygons
    file-type i       ;; Write the ID
    file-type ","     ;; Write a comma to seperate ID and the next column
    ;; Ask the corresponding patch to write its color:
    ask patches with [ID = i] [file-print mycolor]
    file-type "\r\n"  ;; Write a new line (we want one line per polygon)
    set i i + 1
  ]

  file-close ;; Close the file, save the results

end
@#$#@#$#@
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count turtles
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Export current map to result.txt in data folder. To use it in ArcGIS, open the text file in ArcGIS, and export data to a dbf file to replace the oringinal DC.dbf file.
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@#$#@#$#@
## WHAT IS IT?
This is a segregation model built using the map of Wahington DC. The form of data is vector data. This model is inspired by the Schelling segregation model.

![Picture not found](file:data/DCmap2.jpg)

## HOW IT WORKS

There is one agent in each polygon. They are either blue or red. They look at the color of their geometrical neighboring polygons and decided whether they are happy or not. There is a slider to adjust how much percentage of same color neighbors they need to be happy. If one is not happy, it will move to an unoccupied neighboring polygon.

## HOW TO USE IT

1. Adjust "Percentage-same-to-be-happy" slider.
2. Press Setup to display the map and locate agents.
3. Press Go to ask agents to move for once.
4. Or Go forever to ask agents to move until all are happy.
5. Export the map to ArcGIS.

## THINGS TO NOTICE

In this simple model, there is only one turtle in each polygon, therefore, the polygon has same color with the turtle on it.

## THINGS TO TRY

Try different levels of percentage-same needed to be happy. Is there a level after which they can't reach static situation?

Export the final map to a text file and open it in ArcGIS to save as .dbf file. Replace the DC.dbf with this file and open DC.shp in ArcGIS.

## EXTENDING THE MODEL

What if there are more than one agent in each polygon? The shapefile has a variable population, it may be used to explore this question.

## NETLOGO FEATURES

It is tricky to find the geometrical neighbors of each polygon, since Netlogo does not have this function. How I did it was to use the Polygon Neighbors function in ArcGIS 10.2 to create a text file which maps each polygon to its neighbors. Then, I deleted unecessary information like headers and ask Netlogo to read the information.


## RELATED MODELS

Segregation model in the library.

## CREDITS AND REFERENCES

The model was created by Yang Zhou (http://geospatialcss.blogspot.com/) under the guidance of Andrew Crooks.

Schelling, T. C. (1969). Models of segregation. The American Economic Review, 488-493.
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