Plot Map in Julia

Freya_the_Goddess · July 10, 2022, 12:39pm

Hi all,

I want to know is it possible to plot map with color for different country by using Julia. like this:

Each color could represent certain cluster/grouping.

I see mapbox is expensive, we need to have credit cards just for registration. Some like me do not have such luxury.

cormullion · July 10, 2022, 1:13pm

A quick search (on my phone) in this discourse led me to

gist.github.com

https://gist.github.com/TheCedarPrince/52f9be6c14479fecce0b403751fafcc2

choropleth.jl

#=

Summary: A simple gist on creating a choropleth map of counties in the US.

NOTE: You must install this data set for this gist: https://www2.census.gov/geo/tiger/TIGER2017/COUNTY/tl_2017_us_county.zip

Copyright 2021 Jacob Zelko (aka TheCedarPrince)
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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but there are also resources such as Makie, GMT, OpenStreeMapX, to name a few.

Perhaps you could try a few and post your code if you get stuck?

josuagrw · July 10, 2022, 1:37pm

You could find a free SVG map and then manipulate the colors using GitHub - JuliaIO/LightXML.jl: A light-weight Julia package for XML based on libxml2.

empet · July 10, 2022, 1:52pm

If you want to plot a mapbox choropleth, you don’t have to pay for mapbox, when callling PotlyJS.choroplethmapox.
See an example here https://discourse.julialang.org/t/valid-geojson-object-for-choroplethmapbox-trace/72592

rafael.guerra · July 10, 2022, 5:04pm

Linking a related thread.

joa-quim · July 10, 2022, 8:17pm

The problem is not to make the choropleth map (here’s another elaborated example in GMT.jl
The problem is on how to plot the country names without doing it one by one.

rafael.guerra · July 10, 2022, 8:36pm

Simply load a CSV with country centre coordinates as shown here.

joa-quim · July 10, 2022, 8:43pm

Not that simple. Those simple cases could be automatically set by computing the country polygon’s centroids. The real problem comes from cases like (using the example fig)
Democratic Republic of Congo
Tunisia
Burundi
Djibouti
Lesotho

ufechner7 · July 10, 2022, 8:46pm

Well, if you have less than 10 country names then adjusting the position of the labels manually should be easy…

joa-quim · July 10, 2022, 11:08pm

Good luck with