From 40dc279fce9043ae5f93dae49ec29f6fa82116d5 Mon Sep 17 00:00:00 2001
From: Andrew Byrd <andrew@fastmail.net>
Date: Tue, 17 Oct 2023 13:39:09 +0200
Subject: [PATCH] Use pixel centers in WebMercatorGridPointSet

All other uses of pixel edge functions now seem to be only for finding
bounds of pixels, the entire grid, or extents. Point positions should
now be uniformly in the center of Mercator pixels.
---
 .../conveyal/r5/analyst/WebMercatorGridPointSet.java   | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/src/main/java/com/conveyal/r5/analyst/WebMercatorGridPointSet.java b/src/main/java/com/conveyal/r5/analyst/WebMercatorGridPointSet.java
index bc5475c2c..55a01f028 100644
--- a/src/main/java/com/conveyal/r5/analyst/WebMercatorGridPointSet.java
+++ b/src/main/java/com/conveyal/r5/analyst/WebMercatorGridPointSet.java
@@ -12,6 +12,8 @@
 
 import static com.conveyal.r5.analyst.Grid.latToPixel;
 import static com.conveyal.r5.analyst.Grid.lonToPixel;
+import static com.conveyal.r5.analyst.Grid.pixelToCenterLat;
+import static com.conveyal.r5.analyst.Grid.pixelToCenterLon;
 import static com.conveyal.r5.analyst.Grid.pixelToLat;
 import static com.conveyal.r5.analyst.Grid.pixelToLon;
 import static com.conveyal.r5.common.GeometryUtils.checkWgsEnvelopeSize;
@@ -115,14 +117,14 @@ public double sumTotalOpportunities () {
 
     @Override
     public double getLat(int i) {
-        long y = i / this.width + this.north;
-        return pixelToLat(y, zoom);
+        final int y = i / this.width + this.north;
+        return pixelToCenterLat(y, zoom);
     }
 
     @Override
     public double getLon(int i) {
-        long x = i % this.width + this.west;
-        return pixelToLon(x, zoom);
+        final int x = i % this.width + this.west;
+        return pixelToCenterLon(x, zoom);
     }
 
     @Override