From b953775de2efede463f2658f54dfa3688aac473e Mon Sep 17 00:00:00 2001
From: Greg Bowering <gerg.bowering@gmail.com>
Date: Fri, 27 Oct 2017 11:36:02 +1030
Subject: [PATCH 1/2] Default OSM Mapnik layer to 50% opacity

The OSM Mapnik tiles from http://a.tile.openstreetmap.org/ are fully opaque PNG tiles which makes it a base layer and unusable as an overlay.
Most WWJ applications would likely prefer to use OSM as an overlay.
The NASA OpenStreetMap map cache at https://worldwind20.arc.nasa.gov/mapcache served OSM overlay tiles that included transparent voids, however that server is currently returning 404 Not Found for /mapcache
Using OSMMapnickLayer with a default 50% opacity is a simple substitution for the broken NASA OSM layer.
---
 src/gov/nasa/worldwind/layers/Earth/OSMMapnikLayer.java | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/gov/nasa/worldwind/layers/Earth/OSMMapnikLayer.java b/src/gov/nasa/worldwind/layers/Earth/OSMMapnikLayer.java
index 94c56d1069..decfb9580f 100644
--- a/src/gov/nasa/worldwind/layers/Earth/OSMMapnikLayer.java
+++ b/src/gov/nasa/worldwind/layers/Earth/OSMMapnikLayer.java
@@ -17,9 +17,12 @@
  */
 public class OSMMapnikLayer extends BasicMercatorTiledImageLayer
 {
+    static final double DEFAULT_OPACITY = 0.5d;
+
     public OSMMapnikLayer()
     {
         super(makeLevels());
+        setOpacity(DEFAULT_OPACITY);
     }
 
     private static LevelSet makeLevels()

From 2b76391d230efec1d4a7ef616b0882fca997371c Mon Sep 17 00:00:00 2001
From: Greg Bowering <gerg.bowering@gmail.com>
Date: Fri, 27 Oct 2017 11:40:27 +1030
Subject: [PATCH 2/2] Replace broken NASA OSM layer with OSMMapnickLayer

Note the NASA OSM layer configured via config/Earth/OpenStreetMap.xml points to https://worldwind20.arc.nasa.gov/mapcache which is currently returning 404 Not Found errors
---
 src/config/worldwind.layers.xml | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/config/worldwind.layers.xml b/src/config/worldwind.layers.xml
index d7ffef9a59..4f13effede 100644
--- a/src/config/worldwind.layers.xml
+++ b/src/config/worldwind.layers.xml
@@ -30,14 +30,14 @@
     <Layer href="config/Earth/USGSTopoLowResLayer.xml" actuate="onRequest"/>
     <Layer href="config/Earth/USGSTopoMedResLayer.xml" actuate="onRequest"/>
     <Layer href="config/Earth/USGSTopoHighResLayer.xml" actuate="onRequest"/>
-    <!--<Layer className="gov.nasa.worldwind.layers.Earth.OSMMapnikLayer" actuate="onRequest"/>-->
+    <Layer className="gov.nasa.worldwind.layers.Earth.OSMMapnikLayer" actuate="onRequest"/>
     <!--<Layer className="gov.nasa.worldwind.layers.Earth.OSMCycleMapLayer" actuate="onRequest"/>-->
     <Layer className="gov.nasa.worldwind.layers.Earth.CountryBoundariesLayer" actuate="onRequest"/>
-    <Layer href="config/Earth/OpenStreetMap.xml" actuate="onRequest"/>
+    <!--<Layer href="config/Earth/OpenStreetMap.xml" actuate="onRequest"/>-->
     <!--<Layer href="config/Earth/WorldBordersShapefile.xml" actuate="onRequest"/>-->
     <Layer href="config/Earth/EarthAtNightLayer.xml" actuate="onRequest"/>
     <Layer className="gov.nasa.worldwind.layers.Earth.NASAWFSPlaceNameLayer"/>
     <Layer className="gov.nasa.worldwind.layers.WorldMapLayer"/>
     <Layer className="gov.nasa.worldwind.layers.ScalebarLayer"/>
     <Layer className="gov.nasa.worldwind.layers.CompassLayer"/>
-</LayerList>
\ No newline at end of file
+</LayerList>