Where is 2200 Gervais Street?

• With the street name and number it is possible to more precisely assign an X Y coordinate to the address.
• The level of precision is a function of the type of basemap that is available:
• If there is a digital version of the tax maps or another representation of the property boundaries then the address can be accurately assigned to either the parcel polygon or centroid.
• If a parcel level GIS file does not exist then the best alternative is to interpolate along a street segment.
• This is the major approach to Geocoding in the United States and represents the basic approach developed by the Bureau of Census in the original DIME (Dual Independent Map Encoding) system implemented in the 1970 Census.
• It relies on a topologically structured file with from and to nodes and addresses ranges for both sides of the street.
• Addresses are assigned coordinates by interpolation from the nodes on the basis of the proportion of the address range the address represents
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