Time is moving too fast. Spring Break was great, but where did it go? This week, we are working on Dot Mapping. We use conceptual data (or raw-count data) for dot mapping. The first dot map was created by French Cartographer Montizon, depicting the population of France in 1830. Our task this week was to create a dot map depicting the population of Southern Florida. Specific objectives are:
- Join spatial and tabular data
- Utilize dot density symbology
- Select suitable dot size and unit value
- Utilize mask function to manipulate dot placement
- Compile map in accordance with typographic guidelines, cartographic design principles, and the Gestalt Principles
- Provide an overview of the dot density mapping method
- Describe advantages and disadvantages of the dot density mapping method.
All the above was completed using only ArcMap (no CorelDraw-- hurrah)! The tools to Join and Relate a table or excel sheet (Right-click on the layer and select Join and Relates>Join) and to create a dot map (open the Layer Properties, go to Symbology tab, select Quantities, and the Dot Density) are readily available in ArcMap. Once I had the basics of a dot map, I had to ensure that the dot size, value and placement were appropriate for the data. ArcMap, via the ESRI software, places dots randomly so I used the "Properties button" from the "Symbology tab" on "Layer Properties" and I checked the radial buttons for "Fixed Placement" and "Place dots only in these areas" to limit dot placement to "Urban areas." Do you think this sounds confusing? I did too until I ran through the execution a few times. The only frustrating part of this lab was waiting for the layers to draw. I found that if I turned off everything I wasn't working with at the moment, it went much faster. However, when I was close to the end and finalizing my map, I wanted to view all the layers to ensure I had everything complete and accurate. This is where I executed a change and left the room to grab another cup of coffee, or something to eat, or a walk around the house, or...you get my message. I learned great patience in the creation of my Dot Map. Hope you like it!