compound/complex symbol for pointdata
I have a dataset from which I would like to represent data from multiple colums in a single symbol which looks like a pie chart. The symbol would have to be divided in the same amount of sections as there are columns of data. The color of each section would be determined by the value in the corresponding column.
The number of variables within a layer can differ (up to 10) as can the number of states to be presented (up to 5).
I have data for the water quality at a sample site. Four variables are measured. The required symbol would therefore be divided in four sections. Each section represents one variable. If the data is below threshhold_1 the color for the section of the symbol should be green. If the value is between threshhold_1 and _2 it should be yellow and when it is above threshhold_2 it should be red. If no data is available it should be blank or transparent (only outline of the section visible).
Is it possible to create such a symbol and if so how (preferably using Arcmap 9.3)
Mapping Center Answer:
That's an interesting idea--and of course the pie chart symbols don't do that.
What you would need, instead, is attributed pie wedge geometry. I'm thinking you could make some "dummy" data that would give you equally sized pie chart wedges in the number of wedges you require. Convert those to graphics, and then convert those graphics to features. Then use the Identity tool to assign the values to the wedges from your original data. That latter part will be tricky since you'd need to select only all the 10:00 to 2:00 wedges, and run Identity, then do the same for the 2:00 to 6:00 wedges. A trick to do that is to create centroids for your polygons and then select them all, moving them such that they overlap the correct wedge in each pie. Then create another set of offset centroids for each of the wedges.
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