What symbology will show the presence of multiple types and quantities at the same location?
I have been asked to produce a map that shows marine sampling locations of various coral types. There are 5 coral species represented. Additionally, the markers are to differ in size depending on the presence/quantity of coral found at that location. The problem I am having is some sampling locations have multiple corals present and multiple quantities present. Some sample sites are being cover-up by other sites and visually, data is being lost. I have attached a JPEG file to show what I have done so far but it's still lacking and doesn't seem to be accurately depicting the data. The data is also tied to a bathymetric layer.
Thanks for your help!
Attachment: Presence/quantity of corals
Mapping Center Answer:
Given your problem: show type, quantity and location of samples; I’ll first say there’s nothing in ArcMap that will do all three automatically. You can do type and quantity (using the bivariate symbology) or you could offset automatically, but not have the symbology you need. Also, given that it doesn’t look like you have too many sample sites, I would recommend the following:
1. Add two additional feature classes:
a. A point feature class to represent the sample sites. Symbolize with an X or something similar. I would also have a unique ID for each site, that way you can add that to your sample’s as an attribute and use as the basis for a relationship, if you need an interactive component for your map.
b. A line feature class to store leader lines
2. Then edit your samples, moving them slightly away from the sites, and then add leader lines that connect the sites.
3. Symbolize the samples using the bivariate symbology.
The result should look a bit more like an information-graphic or an illustration instead of just drawing your data on the screen.
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