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Thread: Creating Density Map?

  1. #1

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    Default Creating Density Map?

    I have a shapefile that consists on census blocks with multiple attributes per block. I am trying to find a way to consolidate those attributes into a quantity and use this to map density of attributes. The issue is that these attributes are text, not numbers. For example, if I am trying to determine the density of telecom providers for one specific census block, I have 12-32 instances of that one block in my .dbf, each with a different NAME. How can I add those NAMES up and map only the total calculation?

  2. #2
    Stephen Kilburn
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    Default Point of clarification

    Don't quite understand your description of the dataset. Are you saying:

    1. The shapefile has an attribute table that looks like NAME1, NAME2, NAME3 ..., and these are populated with names of telecom providers, i.e. there is one polygon per census block that records the names of all providers in multiple columns.

    2. The shapefile has a single attribute, NAME, that has a list of all telecom providers (perhaps comma-delimited, e.g. Provider1, Provider2, Provider3, i.e. there is one polygon per census block that records the names of all providers in one column.

    3. The shapefile has a single attribute, NAME, that has the name of a provider, and the census block polygon is replicated multiple times, with NAME identifying each particular provider.

  3. #3
    John DeMartino
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    Default Re: Creating Density Map?

    I think what he's saying is that he has one shapefile with the census blocks and a separate dbf with the provider data. Dbf would list which block the provider is in? Or do they need to be geocoded?
    If you can geocode the provider list you can then do a spatial join with the block data and get a 'count' field that you can use to map your density.

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