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I'm not really sure this is the correct location to post this, but I thought I would take a stab at it. I'm looking for a way to generate random lines on a specific lengths. I'm going to be selecting a subset of line segments from a layer and need to generate a shape file with the following attributes. Limited to the extend of a second layer; should contain the same number of lines, with the same lengths as those found in the original shape file; end points should be random pursuant too the first two requirements. My best guess here is that I need to generate random points within the extend of the bounding layer, assign a random direction, assign an endpoint at the specified distance (equal to the specified distance from the origin point), discard and repeat if the endpoint is outside the extend of the bounding layer. I have no idea how to accomplish this. Anyone have suggestions for workflow.
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05-14-2012
01:00 PM
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I'm trying to do some kernel density estimates for a population of animals. The ecological literature is rife with examples of people doing this using the Animal Movement extension, but this is no longer available with modern versions of ArcInfo. I have been running into a couple of problems. First, I need to figure out how to control the bandwidth. I need to use the Least Squares cross-validation (LSCV) method, but moreover I need to be sure how to specify bandwidth to begin with. Based on the the spatial analyst documentation I am assuming that search radius is synonamous with bandwidth here (since it directly affects smoothing of the resulting kernels)? Anyone have any experience implementing LSCV? The extent of the region showing the density estimate contours also cuts off right at the edges of data I'm working with. Any idead on how to get it to display/calculate the whole kernel? Finally, I need to calculate area based on the 95% density estimate I create here but the raster created seems to have a continuous distribution contained in it and the display varries based on what catagories I request. Again ... help! I'm open to all suggestions. Matt
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08-30-2010
01:18 PM
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Unfortunately there is a note on the website that say's no updates or support is planned because the individuals responsable for the extension are no longer with USGS. I guess I'm SOL in that regard. I'm playing around with the Kernel Density tool in the Spatial Analyst and I'm getting some results but I'm going to have to really play around with it to get anything usable. Perhaps I'll have to start a thread on that.
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08-27-2010
11:48 AM
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Yes I think the report author was using 3.x. I assume based on your comment that this extention is probably entirely incompatable with 9.X? No workarounds for that sort of thing? I may be able to get a special license for 3.x if nessisary. Any other ideas?
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08-27-2010
08:10 AM
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It's been a while since I've had call to use an ESRI software seriously so if this seems overly simplistic or otherwise newbieish bare with me. I'm running ArcInfo 9.3.1 and I'm trying to install the Animal Movement extesion from the USGS. This extension depend explicitly on Spacial Analyst and thus I am posting my question here. It's an older extention, but I need to verify some results from an existing report and I'm trying to repeat the procedure used. I've used this extention before but it was always preinstalled on the machine. This extention does not have an installer and basicly what I need to know (I think) is what directories are those defined by the environmental variables $AVEXT, $AVLIB, and $AVBIN. I've taken an educated guess that Lib and Bin dirrectories in the ArcGis home directory correspond to the obvious variables, but the $AVEXT variable has me baffled. I've also tried running the following script from a custom toolbox: E = System.getEnvVar("AVEXT") L = System.getEnvVar("AVLIB") B = System.getEnvVar("AVBIN") msgbox.info(E," ",L," ",B,"") The script runs indefinatly and never results in anything. I need help with A: Debuging that script; B: Information on what the defaults for those variables are; or C: if I'm really screwing this up, instructions on how to install this extention. If anyone can offer any advice I would appreciate it. Matt
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08-27-2010
08:01 AM
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