COG source and elevation API fixes

website/src/lib/getLongestLine.ts

@@ -11,8 +11,9 @@ import {
   getElevationAtCoord,
   getScaleFromCog,
   Log,
+  PRE_VARIABLY_SCALED_TIFFS__COG_SCALE,
+  PRE_VARIABLY_SCALED_TIFFS__RUN_VERSION,
   startLoadingSpinner,
-  VERSION,
 } from './utils';
 
 // Masks for unpacking bit-packed line of sight data.
@@ -246,7 +247,7 @@ async function findNearestCOGURLs(coordinate: LngLat) {
   const cogFilenames = [];
   for (const [filename, cog] of cogsIndex) {
     const distance = coordinate.distanceTo(cog.centre);
-    const radius = cog.width / 2;
+    const radius = cog.width / 2 / PRE_VARIABLY_SCALED_TIFFS__COG_SCALE;
     Log.debug(
       `👀 Checking Longest Line COG: ${filename}`,
       `with centre: ${cog.centre} and radius ${radius}`,
@@ -354,8 +355,9 @@ export function convertRasterXYToLngLat(
 function getLongestLinesSource() {
   const params = new URLSearchParams(self.location.search);
   const source = params.get('longest_lines');
+  const version = PRE_VARIABLY_SCALED_TIFFS__RUN_VERSION;
   if (!source) {
-    return `${CDN_BUCKET}/runs/${VERSION}/longest_lines_cogs`;
+    return `${CDN_BUCKET}/runs/${version}/longest_lines_cogs`;
   } else {
     return source;
   }

website/src/lib/renderLongestLine.ts

@@ -9,6 +9,7 @@ import {
   aeqdProjectionString,
   computeBBox,
   disablePointer,
+  PRE_VARIABLY_SCALED_TIFFS__LINE_ANGLE,
   rotate,
   toRadians,
 } from './utils.ts';
@@ -70,7 +71,7 @@ export async function render(lngLat: LngLat) {
     console.log(longestLine);
   }
 
-  longestLine.angle = longestLine.angle - 90;
+  longestLine.angle = longestLine.angle + PRE_VARIABLY_SCALED_TIFFS__LINE_ANGLE;
 
   const θ = toRadians(longestLine.angle);
   const dx = longestLine.distance * Math.cos(θ);

website/src/lib/utils.ts

@@ -10,9 +10,19 @@ export const MAP_SERVER = `https://${MAP_SERVER_SUBDOMAIN}.alltheviews.world`;
 export const WORLD_PMTILES = 'world';
 export const PMTILES_SERVER = `${MAP_SERVER}/runs/${VERSION}/pmtiles/${WORLD_PMTILES}`;
 
+// All these `PRE_VARIABLY_SCALED_TIFFS__*` values are for old runs that didn't have variably scaled
+// .tiffs. We're just using them whilst the latest run is the high refraction run,
+// 'ryan-world2-run-refraction23', which produces notably longer lines of sight. Should we update the
+// Top Ten list of longest lines?
+export const PRE_VARIABLY_SCALED_TIFFS__RUN_VERSION = 'ryan-fullworld-raw';
+// Should be `0`
+export const PRE_VARIABLY_SCALED_TIFFS__COG_SCALE = 100;
+// Should be `-90`
+export const PRE_VARIABLY_SCALED_TIFFS__LINE_ANGLE = 0;
+
 // This is for busting Cloudflare asset cache. Like for an updated `world.pmtiles`,
 // longest lines index, etc.
-export const CACHE_BUSTER = '?buster=18:36-30/04/2026';
+export const CACHE_BUSTER = '?buster=17:47-25/08/2026';
 
 export const EARTH_RADIUS = 6371_000.0;
 
@@ -194,11 +204,10 @@ export function setVectorVisibility(state: AppState, isVisible: boolean) {
 }
 
 export async function getElevationAtCoord(coord: LngLat) {
-  const base = 'https://api.elevationapi.com/api/Elevation';
-  const url = `${base}?lat=${coord.lat}&lon=${coord.lng}&dataSet=NASADEM`;
+  const base = 'https://www.elevation-api.eu/v1/elevation';
+  const url = `${base}/${coord.lat}/${coord.lng}`;
   const result = await fetch(url);
-  const payload = await result.json();
-  return payload.geoPoints[0].elevation;
+  return await result.text();
 }
 
 export function getScaleFromCog(cog: GeoTIFFImage) {