Okay, so now that we know why we might use anĪlternative projection, how do we do it? Well, it’s not too difficult.Īs mentioned above, we will use the Lambert Conformal Insight and informative, but also engaging…it should look good! I don’t know what it is about the Lambert ConformalĬonic projection (or any conic projection) compared to the Mercator projection, but it just looks sooooo I think our dataviz work should not only be quick to You were attempting to float Alaska and Hawaii in other sheets). (Note that sizing is also a major problem if Slightly simply so that they are a better fit please keep this in mind. However, decrease the size of Alaska to about 50% as well as adjusts Hawaii We will be using today takes Alaska and Hawaii and places them to the bottom The Lambert Conformal Conic projection shapefile that Want without covering portions of the other sheets, and it is just really Of additional work, it is difficult to float those sheets exactly where you one for Alaska, one for Hawaii, and one for the lower 50 You could also create additional sheets, i.e. If you are not worried about geograp hy, hex maps are a great There are plenty of workarounds for this. More difficult to read and it just looks bad. So far away from the lower 50 states, that it makes the lower 50 states much So large (well, it appears so large in the Mercator projection) and is If you’ve ever built a US map in Tableau, you probably In order to address the problems of projections like Web Mercator, map projections may introduce other distortions such as the shape of the land, etc. That said, I should probably be a bit more careful with my loose usage of the phrase "more accurate". Upon this problem leading to more accurate maps. Using a different map projection can improve Objects become much more skewed the further they are from the equator. Mean, it’s really easy to build maps in Tableau, why would we want to takeĪs we saw above with the Mercator projection, geographic You can read more about it here).īut before we get into “how to do it”, let’s talkĪbout why we might want to use an alternative projection shapefile? I This simple, I’m going to focus on the United States and utilize the Lambert Conformal Conic projection via a shapefile, which I obtained from the brilliant (and regular FlerlageTwins contributor) Sarah Battersby on the Tableau Forums. Projection is the standard in Tableau, we can implement some of these differentĪ lot of different projections as well as a lot of different techniques Suggest you check out the 20 m inute presentation from Adi McCrea on the DatafamCommunityJam Episode 4 (about 4:30Īs mentioned above, there are numerous different map If you want to learn more about this topic, I’d Check out the size of the buffer near theĮquator then how it increases as you move away from the equator…pretty insane, In this example, the buffer measures 1000 km (~620 miles). The second example is something I shared on Twitter a couple months back. Of Greenland (in blue) to Africa on the Mercator projection versus real How crazy is that? Many years ago, Ken actually created a viz and blog post about this very topic where he shows this comparison The Mercator projection then shows its actual size (from ). The first shows what Greenland looks like in This can be easily demonstrated with two different examples. More as you get further away from the equator. Major problem is that it distorts the size of geographical objects more and Takes the spherical Earth, turns it into a cylinder, which is then flattened as Mercator projection is a cylindrical map projection, which means it essentially Numerous attempts resulting in numerous different map projections.Īs a standard, Tableau, and most mapping applications, Otherwise, please check out the full blog post below. If you've already read the blog post and you are just looking for the files, you can download them from my Google Drive here.
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