Posted by: dmconroy | May 5, 2009

Mitchell 2,3,4

Why map where things are?

By looking at the distribution of features on the map rather than individual features you can see patterns that better help you understand the area you are mapping. This can influence where you should take action or where changes are most need or would be most effective. Patterns can be seen and identified

Deciding what to map

For each individual set of data, certain types of symbols and representation may be more appropriate or effective for the set.

-You can use point features- to map where crimes occur, or to map where different types of crimes occurred.

How will you use the map is an important factor

The audience of the map is sometimes the most important part of deciding what to show and how to show it

– The amount of detail in a zoning map would matter depending on if you are presenting the information at a city council meeting to discuss the location of heavy industry would be different than if you are presenting information about overall zoning patterns in the city

– The way the map is presented also affects the amount of information included. In some cases reference points like roads and waterways can be useful

If the map is able to present the information clearly, you may be able to identify patterns in the data

People map where the most and least are to find places that meet their criteria and take action or to see the relationships between places

By mapping the patterns of features with similar values you’ll see where the most and least are. This can help you decide how to best present the quantities to see the patterns on the map.

Mapping density can show you where the highest and lowest concentrations of features are. Density maps are effective for identifying patters rather than specific points or individual features.

You can create a density map based on features summarized by defined area, or by creating a density surface.

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