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Visionscarto
Maps — and other representations of the world.
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Published
#30DayMapChallenge
By
Fil
Edited
Nov 14, 2021
Importers
18 stars
Insert cell
Insert cell
Insert cell
Insert cell
Insert cell
SPL
=
import
(
"https://cdn.skypack.dev/spl.js@0.1.0-beta.1?min"
)
Insert cell
spl
=
SPL
.
default
(
)
Insert cell
Insert cell
db
=
fetch
(
"https://data.london.gov.uk/download/london_boroughs/9502cdec-5df0-46e3-8aa1-2b5c5233a31f/london_boroughs.gpkg"
)
.
then
(
(
response
)
=>
response
.
arrayBuffer
(
)
)
.
then
(
(
d
)
=>
spl
.
db
(
d
)
)
Insert cell
Insert cell
boroughs
=
db
.
exec
(
"select name, geom from london_boroughs"
)
.
get
.
objs
Insert cell
srid
=
db
.
exec
(
"select srid(geom) from london_boroughs"
)
.
get
.
flat
Insert cell
Insert cell
// this projection takes "already projected" data and sends it to our image coordinates
projection
=
d3
.
geoIdentity
(
)
.
reflectY
(
true
)
.
fitExtent
(
[
[
20
,
20
]
,
[
width
-
20
,
height
-
20
]
]
,
{
type
:
"MultiPolygon"
,
coordinates
:
boroughs
.
map
(
(
{
geom
}
)
=>
geom
.
coordinates
)
}
)
Insert cell
path
=
d3
.
geoPath
(
projection
)
Insert cell
height
=
width
*
0.75
Insert cell
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db
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boroughs
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srid
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path
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height
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