can someone please respond to my post? I am dissappointed that nobody responded.
Yeah, I think that's the main thread for doing polygons. The answer is "Yeah, you can do it if you want it bad enough and put in the effort, but it's just not directly supported." So... it depends.
Another question to ask yourself is, "Does state size have the proper meaning in this representation?" You can put in a lot of work to make and color polygons and end up with a viz that looks snazzy, but is actually deceptive because the size of the states doesn't match the data you're mapping.
If you want custom data layers, you need to use your own WMS server.
I have the same issue - but what if a WMS server doesn't exist that has your data? In my case, I've pulled down some specific data sets by county (an existing geographic role) for a subset of the US (based on Client request). So instead of selecting the data layer built into Tableau of "US Households | Household Income (median)" I'd like to select for example my "custom" data layer of "Percentage of Household overcrowded". The By would be County and the Using would be any of the standard options available.
Is there no way to do this without a WMS server?
Beyond that, do you wish to use filled map mark type or polygon mark type? There are now various methods to enable both, either with ESRI shapefiles using ESRI personal databases, Richard Leeke's tool, or GQIS/PostgresSQL/PostGIS for polygon mark type. For filled maps, you're into some custom geocoding. At this time, I can't recommend custom geocoding, because the underlying maps are
a) not dynamic, i.e. they don't take into account (historical or contested) boundary changes
b) not of high enough resolution, both in foreground and background layers.
But that's a matter of opinion.
Alternatively, have a look at urbanmapping.com's library of data layers and see if they can come up with something for you.
For the capability that you need, I'd advise you look at Geoserver as a WMS, and populate your shapefile with that as a background, then connect to your data.
I'm looking at the demo file from Urban Mapping now. I'll have to look into the other options later.
It has been awhile. I recently used Mary Solbrig's solution to bring shape files into Tableau (View the full discussion)
I was able to take the City of Atlanta's publicly available neighborhoods shp file and create this.
I also have a data set of real estate sales in a particular area for all of 2013. I'm hoping to plot the filtered results on top of the N'hoods. The data per the view I did separately looks like this:
Everything I've read makes me think that in order to do a dual axis on these two, I'd have to have a common dimension field in both that can be linked. I renamed a field in one so that they both have "Name" for the neighborhood. Unfortunately, the marks do not overlay on the polygons. Can you assist? I've attached the file.
You're almost there. Bring the polygon SHP file into QGIS and do Vector Tools -> Polygon centroids. That will give you a SHP file of points at the center of the polygon. This is what you want for the name - so you would do dual axis, one as polygons, one as circle mark type that would allow you to label the middle of the polygon.
There might be easier way - I remember someone doing this just in Tableau.
I had not used QGIS till yesterday. I was able to use the commands Vector --> Geometry Tools --> Polygon Centroids to generate a shape file. When the two (orig n'hood polygon file and the point polygon centroid file) are overlaid in QGIS, you get this:
So I then used Mary's tool again to turn the new shp file into a csv file.
It took me awhile, but I think I realized finally what was going on. That step would allow me to display the name of the n'hood in the center of it's own polygon, HOWEVER, that was not my goal. I was hoping to take sales data that had no common fields with the shape file EXCEPT for the Name of the neighborhood. Essentially, if there are 5 sales in neighborhood A, I want to show five points within that polygon. Beyond that, I want to show what type sale it was, i.e. condo, land, single family, etc via color and the relative size of the sale; which is what my previous post had.
I have that's really a great work related to custom polygons.
I am also facing an issue in designing custom polygons, I will be glad if you can help me on this.
I have latitudes and longitudes which are generated by mobile app. I need to create custom boundaries for them.
Could you please help me in creating "Point Order" for these custom latitudes and longitudes.
Please reply to this asap. This is very critical to me.