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That feedback function was just what I needed. The only thing I had to change in my original model was to add the feedback line. The model ended up looking like this: [ATTACH=CONFIG]16994[/ATTACH] I now get a map for each year, and the original input file uses the previous output as feedback, just as I wanted. Thanks a lot 🙂
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08-15-2012
09:54 PM
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I tried once more, and I got a basic "for" function to work, though I am still not able to add the iteration number by one. At the moment i write "map%value+1%" which does not seem to work. Furthermore Raster Calculator apparently does not like to use layers in the calculation that includes %value%, so I do not really know what to do.
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08-12-2012
08:37 PM
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Thanks for the reply. I have been trying to do something similar, though the "iteration +1" part didn't seem to work, but that is probably just me not knowing the exact way to write the command in modelbuilder. "Iteration +1" did also seem to cause problems in the raster calculators, as the tool could not recognize the layer, but again that is probably because I have written the "iteration +1" command wrong. It seems like I wasn't too far off. Now I just need to figure out how to write the command properly. I will give it another shot.
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08-12-2012
08:14 PM
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Ok, well I have built a simple model that describes the expansion of a city in a year from two parameters, as seen in the image. [ATTACH=CONFIG]16869[/ATTACH] The trick is that I need to make the model calculate how the city will expand through 20 years, meaning that the output of the first run needs to be the input of the next run, as the expansion of the city in year 1 should be taken into consideration when the expansion for year 2 is being calculated and so forth.
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08-12-2012
05:32 PM
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Hi guys I couldn't really figure out in which forum to ask this, so I'll try here. Basically I need to run a model from modelbuilder 20 times where the final output of each run is used as the starting input in the next run. I've should either use the while or for iteration I guess, but I can't really figure out how to implement them in the model.
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08-12-2012
02:43 PM
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I have used a layer representing the slopes instead of the actual DTM since this is more relevant to my problem, and have got this result. [ATTACH=CONFIG]14041[/ATTACH] This may be a viable result, but it avoids steep slopes all together instead of having a changed value depending on going uphill or downhill.
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05-03-2012
01:15 AM
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I am fairly sure that I have followed the steps from the guide, but the result is not what you say it should be, nor do I understand how it should be possible. [ATTACH=CONFIG]13970[/ATTACH] As you can see from the image the cost path follow the hill downwards instead of connecting the two points. When I use the flow direction as the backlink I don't see how the cost path could ever reach my second point. The flow direction points downwards the hill, not toward the second point, as it would be the case when using a normal backlink raster.
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04-30-2012
11:56 PM
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Thanks for the reply I know about the flow direction tool, but I don't see it working in this case. The flow direction tool finds the least friction path downwards from a point, but not from one point to another. I would like to implement the terrain in the analysis a way, so that it is prefered to travel downhill over uphill, resulting in an overall lower cost.
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04-30-2012
12:06 AM
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Hi I am working on making a cost path analysis, and was wondering if there are any simple ways, or advanced ones, to change the value used for the terrain when going uphill or downhill. For example it should be favorable to go downhill, resulting in a low value, while going up hill should give a high value in the cost path calculation. Thanks.
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04-26-2012
01:16 AM
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