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Add contextual layers for SIMD and population density.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,129 @@ | ||
| <script lang="ts"> | ||
| import { | ||
| FillLayer, | ||
| hoverStateFilter, | ||
| LineLayer, | ||
| VectorTileSource, | ||
| } from "svelte-maplibre"; | ||
| import { SequentialLegend } from "svelte-utils"; | ||
| import { makeRamp, Popup } from "svelte-utils/map"; | ||
| import { HelpButton, layerId } from "../common"; | ||
| import { assetUrl } from "../stores"; | ||
| let showSIMD = false; | ||
| let showDensity = false; | ||
| // Color ramp from https://www.ons.gov.uk/census/maps/choropleth, dark to light. | ||
| let simdColorScale = ["#080C54", "#186290", "#1F9EB7", "#80C6A3", "#CDE594"]; | ||
| // The percentiles are [1, 100]. The 5 colors cover 4 each. | ||
| let simdLimits = [0, 20, 40, 60, 80, 100]; | ||
| let densityColorScale = simdColorScale.toReversed(); | ||
| // Use the same (slightly rounded) buckets as https://www.ons.gov.uk/census/maps/choropleth/population/population-density/population-density/persons-per-square-kilometre. TODO Adapt for Scotland. | ||
| let densityLimits = [0, 4700, 13000, 33000, 94000, 1980000]; | ||
| </script> | ||
|
|
||
| <button class="secondary" on:click={() => (showSIMD = !showSIMD)}>SIMD</button> | ||
| {#if showSIMD} | ||
| <SequentialLegend colorScale={simdColorScale} limits={simdLimits} /> | ||
| <p>Darker colours are more deprived</p> | ||
|
|
||
| <HelpButton> | ||
| <p> | ||
| This shows the Scottish Index of Multiple Deprivation (SIMD) from <a | ||
| href="https://www.data.gov.uk/dataset/1102bf85-ed49-440a-b211-da87e8d752eb/scottish-index-of-multiple-deprivation-simd-2020" | ||
| target="_blank" | ||
| > | ||
| 2020 data | ||
| </a> | ||
| . SIMD combines different domains: income; employment; health; education, skills | ||
| and training; geographic access to services; crime; and housing. | ||
| </p> | ||
| </HelpButton> | ||
| {/if} | ||
|
|
||
| <button class="secondary" on:click={() => (showDensity = !showDensity)}> | ||
| Population density | ||
| </button> | ||
| {#if showDensity} | ||
| <SequentialLegend colorScale={densityColorScale} limits={densityLimits} /> | ||
| <p>Darker colours are denser</p> | ||
|
|
||
| <HelpButton> | ||
| <p> | ||
| This shows population data from <a | ||
| href="https://www.data.gov.uk/dataset/1102bf85-ed49-440a-b211-da87e8d752eb/scottish-index-of-multiple-deprivation-simd-2020" | ||
| target="_blank" | ||
| > | ||
| 2020 data | ||
| </a> | ||
| . | ||
| </p> | ||
| </HelpButton> | ||
| {/if} | ||
|
|
||
| <VectorTileSource | ||
| url={`pmtiles://${assetUrl("cnt_layers/population.pmtiles")}`} | ||
| > | ||
| <FillLayer | ||
| {...layerId("context-simd")} | ||
| sourceLayer="population" | ||
| manageHoverState | ||
| paint={{ | ||
| "fill-color": makeRamp( | ||
| ["get", "imd_percentile"], | ||
| simdLimits, | ||
| simdColorScale, | ||
| ), | ||
| "fill-opacity": hoverStateFilter(0.7, 0.9), | ||
| }} | ||
| layout={{ | ||
| visibility: showSIMD ? "visible" : "none", | ||
| }} | ||
| > | ||
| <Popup openOn="hover" let:props> | ||
| <p> | ||
| Data zone {props.id} | ||
| has {props.population.toLocaleString()} | ||
| people, and a SIMD rank of {props.imd_rank}, putting it in the {props.imd_percentile} | ||
| percentile. | ||
| </p> | ||
| </Popup> | ||
| </FillLayer> | ||
|
|
||
| <FillLayer | ||
| {...layerId("context-population-density")} | ||
| sourceLayer="population" | ||
| manageHoverState | ||
| paint={{ | ||
| "fill-color": makeRamp( | ||
| ["/", ["get", "population"], ["/", ["get", "area"], 1e6]], | ||
| densityLimits, | ||
| densityColorScale, | ||
| ), | ||
| "fill-opacity": hoverStateFilter(0.7, 0.9), | ||
| }} | ||
| layout={{ | ||
| visibility: showDensity ? "visible" : "none", | ||
| }} | ||
| > | ||
| <Popup openOn="hover" let:props> | ||
| <p> | ||
| Data zone {props.id} | ||
| has {props.population.toLocaleString()} | ||
| people, with a density of {Math.round( | ||
| props.population / (props.area / 1e6), | ||
| ).toLocaleString()} people per square kilometer | ||
| </p> | ||
| </Popup> | ||
| </FillLayer> | ||
|
|
||
| <LineLayer | ||
| {...layerId("context-population-outline")} | ||
| sourceLayer="population" | ||
| paint={{ "line-color": "black", "line-width": 1 }} | ||
| layout={{ | ||
| visibility: showSIMD || showDensity ? "visible" : "none", | ||
| }} | ||
| /> | ||
| </VectorTileSource> |