Hey #DataFam! Have you ever noticed how water is visualized in old maps, e.g.
gallica.bnf.fr/ark:/12148/btv1b84391854/f1.item.zoom#
So cool!!
So...for #RandomQGIStoTableauStuff #2, I tried visualizing water lines in @TableauPublic. I did this by first creating a series of buffers in @QGIS. 🧵
STEP 1: Create buffers at varying distances around/inside your polygons @QGIS
Here, I used negative values so they're inside the polygons (i.e. Great Lakes), resulting in 5 buffers at: -0.02, -0.05, -0.09, -0.15, and -0.22 degrees.
I merged/saved the layers into one shapefile.
STEP 2: Connect to the shapefiles & visualize in @TableauPublic
In this example, I'm working w/ two layers (i.e. Great Lakes & Buffers) & played around w/ the color, borders & opacity to create a few different effects.
Workbook: public.tableau.com/app/profile/dennis.kao/viz/WaterLines/Fig1
I think adding water lines is a great way to add additional texture & maybe movement to one's maps...
Here's a great series on water lines & maps by @oliviafvane: observablehq.com/collection/@oliviafvane/watermarks
Thanks #DataFam!🙏 And keep an eye out for the next #RandomQGIStoTableauStuff!
Dennis Kao
@professorkao
Ramblings about maps, data visualization, Tableau Public, QGIS, etc. Social Work Professor by Day Data Viz & Map Designer by Night
