Content Comparison

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h2. Overview 
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GeoPacks are designed to work with your data without having to be incorporated and stored ininto your source database. Packs provide three types of data:
# *Geographical Labels*
# *Geographical Fields* (WKT Points, and sometimes Polygons)
# *Demographic Metrics*

PacksGeoPacks are structured to have one or more levels of geographical data. When there are multiple levels of data, the levelsdata will be structured in a logical hierarchy. Each level of the hierarchy will contain *Geographical Labels* of different formats and a *Geographical Field* containing a WKT Point (and sometimes a Polygon). The pack will also have *Demographic Metrics* associated with the lowest level of the hierarchy which are automatically aggregated up depending on which hierarchy level you are using at the time. 

h3. Geographical Labels
In order to identify the various levels of data in the pack, and link the pack to your own data, Geographical Labels are included and displayed in variousmultiple formats.

If we look at a simplified version of the Australian Postcode GeoPack it contains the following three level hierarchy:
# State
# LGA (Local Government Area)
# Postcode

Some levels of this hierarchy may have different ways to identify the geography. For example, the State level can be identified asby its full name, or using a three letter code. In this case, there are multiple *Geographical Labels* for the State field; State Label and State Code. An example of possible label fields for this pack would be:

||State Label||State Code||LGA Code||LGA Label||Postcode||
|Victoria|VIC|LGA23430|Kingston|3195|
|Victoria|VIC|LGA23430|Kingston|3196|
|Victoria|VIC|LGA23430|Port Phillip|3205|

These label fields are used to link the pack data to your source data, and as such you must select the label that matches the formatting in your source database. For example, if you're linking on State field and your data is stored as *VIC*, you would link on the *State Code* field. If your data is stored as *Victoria*, you would link on the *State Label* field.

bq. See [GeoPack Linking] for more information.


h3. Geographical Fields 

GeoPacks contain WKT Points and/or Polygons that are linked to each level of Geography contained in the pack, which can then be linked to corresponding records in your data.
Yellowfin combines all the geography for a level into one field, and chooses between point and polygon based on the map selected.
From there, the packs contain centroid POINT data for each level. The packs may also contain POLYGONs for every level, but it does depend on the pack.


h3. Demographic MetricsOnce a pack is linked, using *Geographical Label* fields, the Geographical Fields become available for reporting use. Each level of the pack hierarchy contains one Geographical Field. This field contains a centroid WKT Point, and may also contain WKT Polygons, depending on the pack design. The Geographical Field can be selected by a user and added to a map, and depending on the map type, Yellowfin will choose to use either the Point OR Polygon (where available).

bq. See [GeoPack Maps] for more information.


h3. Demographic Metrics
Finally, the packs also contain *Demographic Metrics*. These are fields that explore various values associated with census demographics available in the geographic area.

If we look at the same simplified Australian Postcode GeoPack as above, it contains various different fields of census information. Most packs contain many demographic fields, but this simplified example contains two; Total Population and Median Age:
 
||Postcode||Total Population||Median Age||
|3195|34102|39|
|3196|23590|39|
|3205|9317|37|

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From this, we can see that the pack contains:
# Geography fields
# Metric Demographic fields
# Geography label fields
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