Upgrade ST_DISTANCE() to ST_DISTANCE_SPHERE(), but there's a permissions issue.

Changelog.md

@@ -5,6 +5,9 @@ This is the changelog for the air quality web interface and its associated HTTP
  - `[Code]` refers to internal changes to the code that have no direct impact on the web interface or the HTTP API, but are significant enough to warrant note.
  - `[Docs]` refers to changes to the [documentation](https://aq.connectedhumber.org/__nightdocs/00-Welcome.html).
 
+## v0.12-dev
+ - [API] Improve accuracy of `distance_calc` for the `list-devices-near` action by using _Haversine's Formula_.
+
 ## v0.11.1 - 22nd June 2019
  - Drastically improve the performance of the backend SQL queries that power the heatmap and device graphs by over 35x in some cases!
      - For users of the HTTP API, said queries are `fetch-data` and `device-data`.

logic/Repositories/MariaDBDeviceRepository.php

@@ -125,10 +125,10 @@ class MariaDBDeviceRepository implements IDeviceRepository {
 				{$s("table_name")}.{$s("column_device_name")} AS name,
 				{$s("table_name")}.{$s("column_lat")} AS latitude,
 				{$s("table_name")}.{$s("column_long")} AS longitude,
-				ST_DISTANCE(POINT(:latitude, :longitude), {$s("table_name")}.{$s("column_point")}) AS distance_calc
+				ST_DISTANCE_SPHERE(POINT(:latitude, :longitude), {$s("table_name")}.{$s("column_point")}) AS distance_calc
 			FROM {$s("table_name")}
 			WHERE {$s("table_name")}.{$s("column_point")} IS NOT NULL
-			ORDER BY ST_DISTANCE(POINT(:latitude_again, :longitude_again), {$s("table_name")}.{$s("column_point")})
+			ORDER BY ST_DISTANCE_SPHERE(POINT(:latitude_again, :longitude_again), {$s("table_name")}.{$s("column_point")})
 			LIMIT :count;", [
 				"latitude" => $lat,
 				"longitude" => $long,

version

@@ -1 +1 @@
-v0.11.1
+v0.12-dev