calculate distances in GIS data

[Azbina Rahman]

Dear netlogo users,

I am a new user of Netlogo and I am facing some problem with a simple application, I will be grateful to have your suggestion. I have two sets of GIS data, one is a polygon of a watershed with numbers of subbasins, other one is a data of some points. I want to measure the distance between the points and the centroid of each subbasins. I am sharing my code and data here as attachment. Please give me your suggestions on how can I calculate the distance.

With warm regards,
Azbina

[Azbina Rahman]

Following up on my past question.

[Pradeesh Kumar K V]

Hello Azbina,

The code for determining centroid is very clearly provided in the GIS example within the models library. I have used the same code and modified it a bit as given below:

to draw-basin-labels

  foreach gis:feature-list-of subbasin-zekiah [ this-basin-vector-feature ->

    let centroid1 gis:location-of gis:centroid-of this-basin-vector-feature

    ; centroid will be an empty list if it lies outside the bounds

    ; of the current NetLogo world, as defined by our current GIS

    ; coordinate transformation

    if not empty? centroid1 [

    create-turtles 1

      [ set xcor item 0 centroid1

        set ycor item 1 centroid1

        set size 0.8

        set color yellow

        set shape "circle"

        ;set label gis:property-value this-basin-vector-feature "CNTRY_NAME"

        ]

      ]

  ]

end

The above code will identify the centroids of each subbasin and show it with a yellow-colored turtle.

For finding distance between the points, you can create turtles on these points and then ask the turtles to measure distance between each other. I have modified your code as follows:

to draw-wwtp

  gis:set-drawing-color yellow

  gis:create-turtles-from-points wwtp-data wwtps [ set shape "circle" set color blue]

  ;gis:draw wwtp-data 3.0

end

wwtps is a breed that I created. The points will be marked with turtles in blue color.

Hope this helps.

Best,

Pradeesh

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[Azbina Rahman]

Thank you so much, Pradeesh. This is very helpful.

Best regards,

Azbina

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Azbina Rahman PhD

Postdoctoral Associate,

Department of Environmental Science and Technology,

University of Maryland College Park.

Phone: +17038992848