SDAP-486: Renamed tile Z-axis dimension to 'elevation' from 'depth' (#18)

Co-authored-by: rileykk <rileykk@jpl.nasa.gov>
diff --git a/CHANGELOG.md b/CHANGELOG.md
index dd47f03..1865f3e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,7 @@
 ### Added
 ### Changed
 - SDAP-469: Changed tile depth fields to reflect a range of depths for a given tile (min & max).
+- SDAP-486: Renamed tile Z-axis dimension to 'elevation' from 'depth' to standardize how Z-axis is treated in SDAP.
 ### Deprecated
 ### Removed
 ### Fixed
diff --git a/src/main/proto/DataTile.proto b/src/main/proto/DataTile.proto
index 9e29c48..7494a2a 100644
--- a/src/main/proto/DataTile.proto
+++ b/src/main/proto/DataTile.proto
@@ -47,8 +47,8 @@
 
     repeated MetaData meta_data = 5;
 
-    float min_depth = 6;
-    float max_depth = 7;
+    float min_elevation = 6;
+    float max_elevation = 7;
 
 }
 
@@ -63,8 +63,8 @@
 
     repeated MetaData meta_data = 5;
 
-    float min_depth = 6;
-    float max_depth = 7;
+    float min_elevation = 6;
+    float max_elevation = 7;
 
 }
 
@@ -78,8 +78,8 @@
 
     repeated MetaData meta_data = 5;
 
-    float min_depth = 6;
-    float max_depth = 7;
+    float min_elevation = 6;
+    float max_elevation = 7;
 
 }
 
@@ -93,8 +93,8 @@
 
     repeated MetaData meta_data = 5;
 
-    float min_depth = 6;
-    float max_depth = 7;
+    float min_elevation = 6;
+    float max_elevation = 7;
 
 }