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3

You can adjust the extent using the xlim and ylim parameters. library(rgeos) p1 = readWKT("POLYGON((0 1,0.95 0.31,0.59 -0.81,-0.59 -0.81,-0.95 0.31,0 1))") par(mfrow = c(1,2)) plot(gBuffer(p1,width=-0.2),col='black',xlim=c(-0.5,1),ylim=c(-0.5,1), xlab="Original") plot(gBuffer(p1,width=-0.2),col='black',xlim=c(-1,1),ylim=c(-1,1), xlab="Zoomed Out")


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180 degrees of latitude = 7200 0.025° sections from pole to pole 360 degrees of longitude = 14400 0.025° sections along the equator 7200 * 14400 = 1.0368 * 10^8 0.025°x0.025° squares (not actually squares)


2

As an alternative to ArcMap, I just installed ArcGIS Pro 1.1 which now supports extent indicators. In my first test of using leader lines I created the style below which I don't think could be done out-of-the-box using ArcMap. There are various other styles and options to experiment with there.


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Following on from what you wrote and the links in the comments sections, I got a more refined hatched boundary (only within the polygons). I used the "Difference Tool" (Vector/Geoprocessing Tools/Difference) and used the following settings to clip the buffer to the extent that I wanted: I used a -20m value for the buffer, but if you wanted longer ...


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i believe this may be an answer https://www.census.gov/geo/reference/centersofpop/animatedmean2010.html http://www.esri.com/news/arcuser/0311/population-drift.html plus this is a really interesting article on the math behind finding the mean center - http://www.ams.org/samplings/feature-column/fcarc-population-center long story short: somewhere in ...


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Here is a list of tools i know about so far: Ushahidi is an existing cloud variant (crowdmap). Ushahidi is a web and mobile platform (open source) which lets you create, vizualize and share posts placed in the map. MapChat is an open source tool for integrating maps with real-time (as well as asynchronous) discussions between multiple users.


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ESRI provided an exercise for using geoprocessing tools for representation. In the final steps it demonstrates the process for masking and shows the results. http://resources.arcgis.com/en/help/main/10.1/index.html#//00s50000005n000000 I hope this helps!


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Here are a few resources I've found about automatically generating maps for transit and other data: Stott et al. "Automatic Metro Map Layout Using Multicriteria Optimization" - Abstract: "This paper describes an automatic mechanism for drawing metro maps. We apply multicriteria optimization to find effective placement of stations with a good line ...



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