Comment puis-je symboliser par catégorie et quantité ?

Question

<\/HEAD>J'ai des polygones pour des propriétés protégées dans une zone de 5 comtés. Idéalement, en raison des problèmes d'échelle, je voudrais symboliser ces propriétés par un seul point au centre de chaque polygone ; dont la couleur correspond à la catégorie de propriété (c'est-à-dire : public, privé, municipal, etc.) et dont la taille correspond à la superficie (nombre d'acres dans la propriété protégée). Est-ce possible ? <\/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.