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Aug
28
comment Exploding overlapping to new non-overlapping polygons?
thanks whuber, your solution was a bit more elegant =D
Aug
28
comment Looping multiple feature classes in python for ArcGIS 10
can you post the operation you'd like to iterate? i'm having a hard time figuring out what you're trying to do. if you post a concrete workflow, i can take a crack at iterating it.
Aug
28
comment How to automatically place parcels on suitability map?
when you say you want to "fill" the most suitable lands, do you mean accumulate a collection that fits certain cost requirements? if you're still trying to solve this problem, could you write a more specific explanation, perhaps with images?
Aug
27
comment Exploding overlapping to new non-overlapping polygons?
thank you all for commenting, and thank you @whuber for your response! i'm currently working through a methodology similar to whuber's answer, and will post an update when (or if) i arrive at an arcpy solution. what i originally wanted was a series of new polys with no self-overlap that could be iterated over for zstats. i think i can get there with the current method.
May
22
comment How to create an offset polyline in arcpy?
This doesn't work because if my offset is 5 meters, I would need to have that 5 meter offset extend from each line perpendicular from any point on the line, else a 5 meter x offset on a horizontal line just moves the whole line west 5 meters, as opposed to extending in the y-direction as well. Therefore, the offset calculation is more complex than that, and I think it's what the Buffer function does.
Feb
26
comment arcgis10: create perpendicular transects to stream at specified intervals
Thank you very much for the explanation! Kernel density functions are hard to wrap one's brain around. I will give the Euclidean Allocation function a shot and see how it works for me.
Feb
26
comment arcgis10: create perpendicular transects to stream at specified intervals
This might be remedied by burning the flow accumulation line into the DEM, but I was thinking of using transects to get at local bank heights instead. My definition of "bank height" is the highest height either east or west of the stream thalweg before elevation drops. This is quite a tricky number to derive, and I hope someone has a good way to get at it.
Feb
26
comment arcgis10: create perpendicular transects to stream at specified intervals
Sorry, correction: the toolbox is called "Riparian Topography Toolbox" by Thomas Dilts (forums.esri.com/Thread.asp?c=93&f=995&t=252754&mc=0). His term was "height above river" and was basically producing a detrended DEM equal to height above the centerline of the river (flow accumulation product). This is then used to "flood" the DEM by specifying a threshold height and running cost distance on a binary raster. This technique is valid and runs very quickly, but for my dataset results in a raster product with heights above river greater than 0 on the river thalweg itself.
Feb
26
comment arcgis10: create perpendicular transects to stream at specified intervals
Thanks for the input, Dr. Huber. I have tried using the River Bathymetry Toolkit, which relies on the kernel density method and was developed via advice you gave on the esri forums. How will the results of this focal max technique differ from that of the kernel density one (relating to bank height)?