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8

I made a custom Create Buffer Interval toolbox for you: http://ianbroad.com/downloads/CreateBufferIntervals.tbx In ArcMap open ArcToolbox, right click in the whitespace and click Add Toolbox. Browse to the one I made and run the Create Buffer at Interval tool. Here's a screenshot of the parameters: It should be pretty straightforward, but let me know ...


5

Here's some R code that does the job, the caveat being we are in cartesian coordinates. The input matrix coords is a 5x2 matrix of x,y columns, with the last point being coincident with the first point. This is what you get out of spatial objects in R when you read a shapefile, for example. thinrect <- function(coords, factor=1/3){ dx = ...


3

This can be solved with a model but there are 4 caveats: You need an Advance (ArcInfo) license This model assumes your rectangle is a rectangle so the 2 vertical sides are longer Your rectangle is constructed from 4 vertices only If you want to automate this then all your rectangles must have the same dimensions So after running this model you you are ...


2

The field calculator cannot be used in that way. If you want to create buffers, use the buffer tool from the vector menu. The buffer function and other geometry functions in the field calculator can be used for calculations but not to create new geometries/features. For example to check if the features intersect a certain geometry: intersects( buffer ...


1

within arcgis, you can use the zonal statistics as table tool. This will give you a table with the ID of your buffer polygon and the statistics of the raster below. Make sure that you set the pixel size equal to your raster size in the environment setting, otherwise the internal conversion from polygon to raster could be too coarse.


1

It looks like your urban areas is a Boolean raster. If so, I would vectorize the raster as the simplest means of getting the urban area 'buffer' to match the 'jaggy sprawl'. You can then do a spatial join of the urban points data on your new polygons to provide the polygons with attributes. If the raster is not Boolean and is in fact a grey scale, then ...


1

Not sure what your image pixel resolution is, but you could use the Raster>Coversion>Polygonize tool to convert raster to polygon. The polygon table should have a column representing the color contrast from low to high which you could query to get ride of those features that are black. You could then apply additional analysis on this layer (e.g. dissolve, ...


1

I created an ArcGIS Create Custom Grid tool that could be useful for this. However, it might have trouble if any of the rectangles are oriented like a diamond shape. You would set the vertical division to 3 and leave the horizontal to 0. After the tool is ran you need to use the Split Polygons tool in the Advanced Editing toolbar. If you use it, let me ...


1

You could use postgis. Your output table, "Points_DT_3" in this example, would need to have its geometry column modified to polygon for this example. This example assumes you want 5 buffers, each 10 feet further than the last. DECLARE @ii; CREATE TEMPORARY TABLE temp1 AS SELECT "Shape", objectid FROM tiger."Points_DT_2"; SET @ii = 5; WHILE @ii > 0 ...



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