├── data
    ├── french_departments.gpkg-wal
    ├── covid_data.ods
    ├── french_departments.gpkg
    └── french_departments.gpkg-shm
├── images
    ├── map.png
    └── qgis.png
├── sparkline_map.qgz
└── README.md


/data/french_departments.gpkg-wal:
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1 | 


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/images/map.png:
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https://raw.githubusercontent.com/datagistips/sparkline_map/HEAD/images/map.png


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/images/qgis.png:
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https://raw.githubusercontent.com/datagistips/sparkline_map/HEAD/images/qgis.png


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/sparkline_map.qgz:
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https://raw.githubusercontent.com/datagistips/sparkline_map/HEAD/sparkline_map.qgz


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/data/covid_data.ods:
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https://raw.githubusercontent.com/datagistips/sparkline_map/HEAD/data/covid_data.ods


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/data/french_departments.gpkg:
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https://raw.githubusercontent.com/datagistips/sparkline_map/HEAD/data/french_departments.gpkg


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/data/french_departments.gpkg-shm:
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https://raw.githubusercontent.com/datagistips/sparkline_map/HEAD/data/french_departments.gpkg-shm


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/README.md:
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 1 | # COVID-19 Sparkline Map
 2 | 
 3 | ![](images/map.png)
 4 | 
 5 | ## Steps
 6 | [Download QGIS](https://www.qgis.org/fr/site/forusers/download.html)
 7 | 
 8 | I used version `3.12`
 9 | 
10 | Open project `sparkline_map.qgz`
11 | 
12 | You'll have this :
13 | ![](images/qgis.png)
14 | 
15 | That's it ! Now, play with styling, parameters
16 | 
17 | ## Data
18 | - [French Boundaries from IGN](https://www.data.gouv.fr/fr/datasets/admin-express/)
19 | - [Covid-19 cases from Santé Publique France](https://www.data.gouv.fr/fr/datasets/donnees-hospitalieres-relatives-a-lepidemie-de-covid-19/)
20 | 
21 | ## Expression
22 | We use this expression for the line geometry :
23 | 
24 | 	with_variable(
25 | 	'height',
26 | 	-- Height factor for each segment. Total height will be nb cases * @height
27 | 	100,
28 | 	with_variable(
29 | 	-- Width of the line, starting from centroid
30 | 	'width',
31 | 	200000,
32 | 	with_variable(
33 | 	'nb_cases',
34 | 	array_sort(
35 | 		relation_aggregate( 
36 | 			-- Relation name 
37 | 			'covid_data_dep_french_dep_INSEE_DEP',
38 | 			-- Compile in an array
39 | 			'array_agg', 
40 | 			-- Calculate number of cases
41 | 			to_int("dc")+to_int("hosp")+to_int("rea")+to_int("rad")
42 | 		)
43 | 	 ),
44 | 	 -- Create geometry
45 | 	geom_from_wkt(
46 | 		-- Create WKT String
47 | 		'LINESTRING ('  || 
48 | 		-- First node is the centroid
49 | 		x(centroid($geometry))||' '||y(centroid($geometry)) ||','||
50 | 		-- Paste the node coordinates
51 | 		array_to_string(
52 | 			-- Iterate over indexes
53 | 			array_foreach(
54 | 				-- Generate a series over the indexes / nodes
55 | 				generate_series(1, array_length(@nb_cases)), 
56 | 				-- X Coordinate of the node
57 | 				to_string(x(centroid($geometry)) + (@element/array_length(@nb_cases)*@width)) ||' '||
58 | 				-- Y coordinate of the node
59 | 				to_string(y(centroid($geometry)) + @nb_cases[@element]*@height)
60 | 			),
61 | 		',') || ')'
62 | 	)
63 | 	)))
64 | 
65 | Also, the labels are positioned using the same kind of expression.
66 | 
67 | ## Links
68 | [See my blog post for an explanation of the expression code](https://datagistips.hypotheses.org/488)
69 | 
70 | ## Map image licence
71 | CC BY SA NC
72 | 
73 | 


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