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Yesterday I got an email from a long time colleague showing me an online map and asking, “When will it be possible to do this map with ArcGIS”? The map is the interactive map of Washington DC at http://dc.everyblock.com. In particular my friend was looking at the crime map wondering how the proportional symbols showing crimes became disaggregated as he zoomed in, eventually showing individual crime sites. Read More...

Example on USGS 1:24,000 scale map of cul-de-sacsThis final part of the series will cover using cartographic representations for dashed lines, like the red and white cased lines in the image at the left, and for creating cul-de-sac or squared off ends to streets.  Both of these effects will build on the examples in the previous two portions of this series with one exception.  Because we will be using cartographic representations for the streets, we will be better able to manage line caps and therefore will not need to use the Dissolve tool to dissolve the streets by name, type, and z-level.  The removal of this step is significant because now an extra dataset is not required just to have cartographic quality streets; everything needed for a high quality cartographic depiction of streets can be stored in attributes. This should come as good news to those of you who have mentioned to us, many times, that managing additional datasets for the sake of cartography is not only a data management, but a political hurdle, that you would just as soon not have to deal with. Read More...