Long thread on this:
More on maps:
Dual Axis Maps
video by Joe Mako: http://www.tableausoftware.com/support/forum/topic/map-shapefiles-and-points
Can use a point annotation with the X & Y coordinates as the label, then drag the annotation around to ID points on the image that can be used to create the custom polygons. (Speeds up the process).
Also for finding X/Y positions: Point Position is a freeware tool for PCs that will find X/Y coordinates on screen.
Batch geocoder that Shawn recommends, for up to 1K addresses at a time:
Can also do stuff w/Tableau’s data
free zip code DB
Zip Code Radius Finder
Also links to Richard Leeks’ geohack work
Richard Leeke post on binning latitude/longitude data in different ways:
pic, and lat/long for arbitrary points
address to lat/long lookup:
Jittering map points
Great Circle routes – Flight path type maps
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Currently (July 2013), the #1 most-voted-for Idea for Tableau is Dynamic Parameters. Here, I’ll show you a technique for using Tableau data blending to create a dynamic, data-driven “parameter”. We’re going to use a loosely coupled secondary data source to get the information associated with the “parameter” and return that information to the primary data source, where it can be used in further calculations. Some examples of where this can be useful:
- Choose one value to build a comparison to other values, such as finding the distance from a chosen origin city to a set of destination cities, or a market basket-type analysis where we want to compare one against others.
- Set the limits and input data to an algorithm that is then used to create other results, for example to get a starting set of data to use to build a projection, such as an executive retirement forecast model.
Read on for a description of the technique and demos of all three options!