From f6d4e20d4fa712bdaadc2ce4194664a9c97bd1a9 Mon Sep 17 00:00:00 2001
From: frederickobrien <frederik.obrien@gmail.com>
Date: Mon, 5 Dec 2022 02:26:53 +0000
Subject: [PATCH] Fix GeoJSON to cover 180th meridian quirk

See https://github.com/mapbox/mapbox-gl-js/issues/3250#issuecomment-294887678 and related thread for further info
---
 data/books/convert-routes-to-geojson.ts | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

diff --git a/data/books/convert-routes-to-geojson.ts b/data/books/convert-routes-to-geojson.ts
index 2a8c4fc..3569af4 100644
--- a/data/books/convert-routes-to-geojson.ts
+++ b/data/books/convert-routes-to-geojson.ts
@@ -12,9 +12,20 @@ csvsInDir.forEach((file) => {
     .formatValueByType()
     .getJsonFromCsv(file);
 
-  const fullRoute = bookJson.map((entry) => {
-    const coords = [entry.Longitude, entry.Latitude];
-    return coords;
+  const fullRoute = bookJson.map((entry, i) => {
+    if (i === 0) return [entry.Longitude, entry.Latitude];
+    else {
+      const previousLongitude = bookJson[i - 1].Longitude;
+      const latitude = entry.Latitude;
+      const longitude = (entry.Longitude +=
+        entry.Longitude - previousLongitude > 180
+          ? -360
+          : previousLongitude - entry.Longitude > 180
+          ? 360
+          : 0);
+      const coords = [longitude, latitude];
+      return coords;
+    }
   });
 
   const geoJson = {