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Thanks for the reply. I actually already figured it out, but thank you nonetheless 🙂 The points at regular intervals were easily done by using the Create Random Points tool with a min. distance of the circle perimeter devided by the numbers of points I wanted. In the end I found a way to use iteration to loop through the table with sites and automate the generation of paths.
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11-02-2011
06:47 AM
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Expand did indeed work. Thanks for the suggestion! On related question though. Expand expands the given number of cells to both sides, making the streams 3 pixels wide. Is there a way to expand only to one side, to make the streams 2 pixels wide? If not, I'll use this, but adding 1 pixel to the width would already skew my results a little. 3 pixels would do so even more, hence the question 🙂 Thanks again! Sander
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10-27-2011
05:34 PM
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Thank you for the quick reply, Eric. I'll give it a go 🙂
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10-27-2011
03:56 PM
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Hi, I have calculated possible stream/river locations from a DEM. The streams are 1 pixel wide. My problem is as follows. I'm trying to do a Least Cost Path analysis on the area in question and have created a cost surface that takes into account that I don't want LCP to move over the streams (currently by setting the streams to NODATA). However, since the streams are only 1 pixel wide, the LCPs just go through them diagonally (see the attached screenshot). Is there a way to fix this? I thought about making the streams 2 pixels wide, to make it impossible to pass through them, but haven't been able to find a suiting method of doing this. I want the LCPs to avoid the streams at all cost. Not sure how the top paths to the target will be created, but that's the idea. Does anyone have an idea how to solve my problem? Any advice is much appreciated! All the best, Sander
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10-27-2011
01:36 PM
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It got it, finally. With the IsNull function I had made the division between land and sea. At first I couldn't find out what to do next (hence my previous post), but in the end I used the Zonal Fill function (input zone = my dem, input weight = IsNull output), filtering out the non-land part. Then I used Raster to Polygon and Polygon to Line to get the coastline. Maybe Raster to Polyline would have worked as well, but I didn't try it.
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10-26-2011
10:30 AM
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Sorry to bump this thread up again, but I'm having a similar problem. I have created a raster with only two categories representing land and water, but I can't find how to turn the divide into a polyline. Any help is much appreciated! Sander
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10-26-2011
08:54 AM
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I was not doing a Spatial Join, but was using other functions in the Model Building. However, I managed to fix the problem. It turned out to be an extent problem. After reprojecting my DEM, I had not yet updated my model properties to account for the changes. That's what caused the crashes for me. Maybe Marty had the same problem. All the best, Sander
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10-17-2011
12:10 PM
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Did this issue get resolved? I'm having similar problems with running functions from within the Model Builder. This computer has SP1 installed and the system admin won't be installing an update anytime soon 😞 The odd thing is, it used to work just fine. Is it a memory issue or something? Thanks for the help! Sander
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10-17-2011
10:20 AM
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Hi, For my MA degree I'm currently studying the defensibility of some archaeological hilltop sites. For this, I want to do Least Cost Path analyses from points in a circle around the sites in question to the sites at the centre. Although I know how to do a usual Cost Path analysis from point A->B, I can't figure out what I need to do in my case, so I have a few questions. 1) Is there a way to get ArcGIS to generate points at regular intervals along the edge of a circle? Or is it only possible to do this manually? 2) How can I adapt the ModelBuilder model to calculate Least Cost Paths from multiple/all points around a site to the site itself simultaneously? I heard it's possible, but couldn't think of a solution for it myself. I must be overlooking something. Do I just make the same model over and over again for each starting point and then run it, or is there a faster way? Thank you very much for any help you can give me. All the best, Sander
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09-27-2011
01:57 PM
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