Hoe symboliseer ik op categorie en hoeveelheid?

Question

<\/HEAD>Ik heb polygonen voor beschermde eigendommen in een gebied van 5 counties. Idealiter, vanwege schaalproblemen, zou ik deze willen symboliseren met een enkel punt in het midden van elke polygoon; waarvan de kleur overeenkomt met de eigendomscategorie (bijv.: public, private, municipal, enz.) en waarvan de grootte overeenkomt met het aantal acres (aantal acres in het beschermde eigendom). Is dit mogelijk? <\/P><\/BODY><\/HTML>

DanPatterson_Retired · Answer

If you want to standardize across regions for example, I prefer to use a manual classification scheme, rather than on that is calculated from the statistical or distribution parameters (ie std dev, natural breaks, quantiles etc).  Also look at your ranges, 0-65 then 65-172 etc etc.  the sizes of the symbols is one thing, whether the increments makes sense to the observer is totally separate issue.

LindsayKeeney · Answer

Thank you. That worked great for when the ownership categories are in different layers.

In an effort to try to standardize the acreage classification across the categories, I merged the layers. Is there a way to symbolize from one layer by both ownership category (color) and acreage (point size). When I try to use quantity by category in the merged layer it places graduated symbolized points by acreage in the center of polygons colored to symbolize the categories.

Is there a simpler way to do this? Should I just manually classify the acreage so its the same across each category?

Thanks for the help.

DarrenWiens2 · Answer

I think you're looking for the Multiple Attributes option. Value Field = ownership category, Variation by Symbol Size = acreage.