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Rewrk to use maplibre helpers as library
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Peter York
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Aug 17, 2023
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Original file line number | Diff line number | Diff line change |
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<script lang="ts"> | ||
import type { MapGeoJSONFeature } from "maplibre-gl"; | ||
import { map } from "../../stores"; | ||
import { ExternalLink, HelpButton, InteractiveLayer } from "../common"; | ||
import { Checkbox } from "../govuk"; | ||
import { | ||
hoveredToggle, | ||
makeColorRamp, | ||
overwriteLineLayer, | ||
overwritePmtilesSource, | ||
overwritePolygonLayer, | ||
} from "../maplibre"; | ||
import { colors } from "./colors"; | ||
import SequentialLegend from "./SequentialLegend.svelte"; | ||
let name = "imd"; | ||
let outlineLayer = `${name}-outline`; | ||
let colorScale = colors.sequential_low_to_high; | ||
// The deciles are [1, 10]. The 5 colors cover two each. | ||
let limits = [0, 2, 4, 6, 8, 10]; | ||
overwritePmtilesSource( | ||
$map, | ||
name, | ||
`https://atip.uk/layers/v1/${name}.pmtiles` | ||
); | ||
overwritePolygonLayer($map, { | ||
id: name, | ||
source: name, | ||
sourceLayer: name, | ||
// Decile 1 is the most deprived, but we want to invert for the color scale | ||
color: makeColorRamp(["-", 10, ["get", "decile"]], limits, colorScale), | ||
opacity: hoveredToggle(0.5, 0.7), | ||
}); | ||
overwriteLineLayer($map, { | ||
id: outlineLayer, | ||
source: name, | ||
sourceLayer: name, | ||
color: "black", | ||
width: 0.5, | ||
}); | ||
let show = false; | ||
// InteractiveLayer manages the polygon layer, but we also need to control the outline | ||
$: { | ||
if ($map.getLayer(outlineLayer)) { | ||
$map.setLayoutProperty( | ||
outlineLayer, | ||
"visibility", | ||
show ? "visible" : "none" | ||
); | ||
} | ||
} | ||
function tooltip(feature: MapGeoJSONFeature): string { | ||
return ( | ||
`<p>${feature.properties.LSOA11CD} has an IMD score of <b>${feature.properties.score}</b></p>` + | ||
`<p>Rank: <b>${feature.properties.rank.toLocaleString()}</b> / 32,844 LSOAs</p>` | ||
); | ||
} | ||
</script> | ||
|
||
<Checkbox id={name} bind:checked={show}> | ||
Indices of Multiple Deprivation | ||
<span slot="right"> | ||
<HelpButton> | ||
<p> | ||
The 2019 English IMD scores come from <ExternalLink | ||
href="https://data-communities.opendata.arcgis.com/datasets/communities::indices-of-multiple-deprivation-imd-2019-1/explore" | ||
> | ||
DLUCH GIS | ||
</ExternalLink>. Note the LSOAs identified are from the 2011 census. A | ||
detailed breakdown of the score across different categories can be found <ExternalLink | ||
href="http://dclgapps.communities.gov.uk/imd/iod_index.html" | ||
> | ||
here | ||
</ExternalLink>. | ||
</p> | ||
<p> | ||
License: <ExternalLink | ||
href="http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/" | ||
> | ||
Open Government License | ||
</ExternalLink>. Contains OS data © Crown copyright and database | ||
right 2023. | ||
</p> | ||
</HelpButton> | ||
</span> | ||
</Checkbox> | ||
{#if show} | ||
<SequentialLegend {colorScale} limits={["Least deprived", "Most deprived"]} /> | ||
{/if} | ||
|
||
<InteractiveLayer layer={name} {tooltip} {show} clickable={false} /> |
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