## Re: [netlogo-users] Question about clear-all

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• Hey Jim, I have implemented density, i would also like to implement topography but thought should get the wind done first. Basically from what I have decided,
Message 1 of 12 , Jun 1 1:13 AM
Hey Jim,

I have implemented density, i would also like to implement topography but thought should get the wind done first.

Basically from what I have decided,

Initially the environment is brown.
slowly trees start growing on it based on density
The lightening strikes at a location
when this happens, based on the wind direction, speed, rain present etc the fire spreads.

Now i have everything until the wind direction, it works okay though, not that great and have no idea how to start with the rain or the topography :(

On Fri, Jun 1, 2012 at 12:37 AM, Jim Lyons wrote:

On May 31, 2012, at 1:00 AM, Zehra Kutubuddin Naseem wrote:

Hey Jim,

Still not understanding it.  I have a poisson distribution that starts a fire at any position at the grid. I want to then move it in the direction of the wind.

patch-at-heading-and-distance -90 1, ; it turns to the west, how do i get all the neighbors of it to ignite as well. if i put a 0 after -90 it just goes everywhere there is a green tree but when i put one, it reaches the end of the world and the last column doesnt burn out.

Hey. What are the rules for a fire spreading? There are a number of fire models around but I am not familiar with them. What other parameters are involved besides the wind speed and direction?

Jim

• So, if the wind is blowing east, how is the fire *supposed* to spread? In a straight line, or in a fan? Maybe you need to look at the In-cone primitive? THen
Message 2 of 12 , Jun 1 12:02 PM
So, if the wind is blowing east, how is the fire *supposed* to spread? In a straight line, or in a fan?

Maybe you need to look at the In-cone primitive? THen you can find a set of patches in the direction of the wind, with a fan shape, so you get spreading in the direction of the wind, and also sideways.

~~James

On Fri, Jun 1, 2012 at 4:13 AM, Zehra Kutubuddin Naseem wrote:

Hey Jim,

I have implemented density, i would also like to implement topography but thought should get the wind done first.

Basically from what I have decided,

Initially the environment is brown.
slowly trees start growing on it based on density
The lightening strikes at a location
when this happens, based on the wind direction, speed, rain present etc the fire spreads.

Now i have everything until the wind direction, it works okay though, not that great and have no idea how to start with the rain or the topography :(

On Fri, Jun 1, 2012 at 12:37 AM, Jim Lyons wrote:

On May 31, 2012, at 1:00 AM, Zehra Kutubuddin Naseem wrote:

Hey Jim,

Still not understanding it.  I have a poisson distribution that starts a fire at any position at the grid. I want to then move it in the direction of the wind.

patch-at-heading-and-distance -90 1, ; it turns to the west, how do i get all the neighbors of it to ignite as well. if i put a 0 after -90 it just goes everywhere there is a green tree but when i put one, it reaches the end of the world and the last column doesnt burn out.

Hey. What are the rules for a fire spreading? There are a number of fire models around but I am not familiar with them. What other parameters are involved besides the wind speed and direction?

Jim

• The fire is meant to spread just towards the east of the enviornment, there requires no fan shaped but justt if the next patch to the east of the fire that
Message 3 of 12 , Jun 3 4:18 AM
The fire is meant to spread just towards the east of the enviornment, there requires no fan shaped but justt if the next patch to the east of the fire that struck needs to burn.

On Sat, Jun 2, 2012 at 5:02 AM, James Steiner wrote:

So, if the wind is blowing east, how is the fire *supposed* to spread? In a straight line, or in a fan?

Maybe you need to look at the In-cone primitive? THen you can find a set of patches in the direction of the wind, with a fan shape, so you get spreading in the direction of the wind, and also sideways.

~~James

On Fri, Jun 1, 2012 at 4:13 AM, Zehra Kutubuddin Naseem wrote:

Hey Jim,

I have implemented density, i would also like to implement topography but thought should get the wind done first.

Basically from what I have decided,

Initially the environment is brown.
slowly trees start growing on it based on density
The lightening strikes at a location
when this happens, based on the wind direction, speed, rain present etc the fire spreads.

Now i have everything until the wind direction, it works okay though, not that great and have no idea how to start with the rain or the topography :(

On Fri, Jun 1, 2012 at 12:37 AM, Jim Lyons wrote:

On May 31, 2012, at 1:00 AM, Zehra Kutubuddin Naseem wrote:

Hey Jim,

Still not understanding it.  I have a poisson distribution that starts a fire at any position at the grid. I want to then move it in the direction of the wind.

patch-at-heading-and-distance -90 1, ; it turns to the west, how do i get all the neighbors of it to ignite as well. if i put a 0 after -90 it just goes everywhere there is a green tree but when i put one, it reaches the end of the world and the last column doesnt burn out.

Hey. What are the rules for a fire spreading? There are a number of fire models around but I am not familiar with them. What other parameters are involved besides the wind speed and direction?

Jim

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