diff --git a/web/src/gis/globe/ArcgisElevationCoverage.js b/web/src/gis/globe/ArcgisElevationCoverage.js
index 82428b62..91a6bdb9 100644
--- a/web/src/gis/globe/ArcgisElevationCoverage.js
+++ b/web/src/gis/globe/ArcgisElevationCoverage.js
@@ -57,21 +57,11 @@ ArcgisElevationCoverage.prototype.retrieveTileImage = function (tile) {
             return;
         }
 
-        let z = 360 / (tile.sector.maxLongitude - tile.sector.minLongitude);
-        let x = (180 + tile.sector.minLongitude) / 360 * Math.pow(2, z);
-
-        if (Math.abs(tile.sector.minLatitude) > 85.01) {
-            return;
-        }
-
-        let lat = Math.log(Math.tan((Math.PI / 2.0 + tile.sector.minLatitude * Math.PI / 180) / 2.0)) * 180 / Math.PI;
-        let y = Math.floor((180 - lat) / 360 * Math.pow(2, z));
-
         this.worker.postMessage({
             tileKey: tile.tileKey,
-            x,
-            y,
-            z
+            x: tile.column,
+            y: tile.row,
+            z: tile.level.levelNumber
         });
 
         this.currentRetrievals.push(tile.tileKey);
diff --git a/web/src/gis/globe/Tessellator.js b/web/src/gis/globe/Tessellator.js
index 17be76d2..69c0456f 100644
--- a/web/src/gis/globe/Tessellator.js
+++ b/web/src/gis/globe/Tessellator.js
@@ -913,9 +913,6 @@ Tessellator.prototype.isTileVisible = function (dc, tile) {
     if (dc.globe.projectionLimits && !tile.sector.overlaps(dc.globe.projectionLimits)) {
         return false;
     }
-    if (tile.level.levelNumber < 4) {
-        return true;
-    }
 
     return tile.extent.intersectsFrustum(dc.frustumInModelCoordinates);
 };
diff --git a/web/src/gis/globe/TiledElevationCoverage.js b/web/src/gis/globe/TiledElevationCoverage.js
index ae2dcc7e..6ae1933d 100644
--- a/web/src/gis/globe/TiledElevationCoverage.js
+++ b/web/src/gis/globe/TiledElevationCoverage.js
@@ -107,7 +107,7 @@ function TiledElevationCoverage(config) {
      * @type {Boolean}
      * @default true
      */
-    this.pixelIsPoint = false;
+    this.pixelIsPoint = true;
 
     /**
      * The {@link LevelSet} dividing this coverage's geographic domain into a multi-resolution, hierarchical
diff --git a/web/src/gis/projections/ProjectionWgs84.js b/web/src/gis/projections/ProjectionWgs84.js
index dce7a495..468ff91e 100644
--- a/web/src/gis/projections/ProjectionWgs84.js
+++ b/web/src/gis/projections/ProjectionWgs84.js
@@ -68,6 +68,8 @@ ProjectionWgs84.prototype.geographicToCartesian = function (globe, latitude, lon
             "geographicToCartesian", "missingGlobe"));
     }
 
+    // latitude = WWMath._mercatorLatInvert(latitude); // TODO
+
     var cosLat = Math.cos(latitude * Angle.DEGREES_TO_RADIANS),
         sinLat = Math.sin(latitude * Angle.DEGREES_TO_RADIANS),
         cosLon = Math.cos(longitude * Angle.DEGREES_TO_RADIANS),
@@ -120,7 +122,7 @@ ProjectionWgs84.prototype.geographicToCartesianGrid = function (globe, sector, n
             lat = maxLat; // explicitly set the last lat to the max longitude to ensure alignment
         }
 
-        //lat = WWMath._mercatorLatInvert(lat); // TODO
+        lat = WWMath._mercatorLatInvert(lat); // TODO
 
         // Latitude is constant for each row. Values that are a function of latitude can be computed once per row.
         cosLat = Math.cos(lat);
diff --git a/web/src/gis/util/Tile.js b/web/src/gis/util/Tile.js
index d76543aa..3d44ef5f 100644
--- a/web/src/gis/util/Tile.js
+++ b/web/src/gis/util/Tile.js
@@ -449,10 +449,10 @@ Tile.computeColumn = function (delta, longitude) {
  * @returns {Number} The computed row number.
  */
 Tile.computeLastRow = function (delta, maxLatitude) {
-    var row = Math.ceil((maxLatitude + 90) / delta - 1);
+    var row = Math.ceil((maxLatitude + 180) / delta - 1);
 
     // If max latitude is in the first row, set the max row to 0.
-    if (maxLatitude + 90 < delta) {
+    if (maxLatitude + 180 < delta) {
         row = 0;
     }