[mkgmap-dev] elevation/depth point in *.osm & *.mp

From David david.tlp at orange.fr on Wed Feb 25 12:26:46 GMT 2009

As I was trying to compile an old map with mkgmap, I discovered that 
elevation spots (0x6300) were wrong. They should be converted in the 
same manner as contour lines.
Now the question is : which tags define depth and elevation spots in OSM 
format (an elevation spot is not always a named peak) ?

Here is the patch for both depth and elevation spots :

Index: PolishMapDataSource.java
===================================================================
--- PolishMapDataSource.java    (revision 929)
+++ PolishMapDataSource.java    (working copy)
@@ -261,6 +261,12 @@
             Coord co = makeCoord(value);
             setResolution(point, name);
             point.setLocation(co);
+            /* if it is depth spot (0x6200) or elevation spot (0x6300), 
then fix units if required */
+            if ((point.getType() == 0x6200) ||
+                (point.getType() == 0x6300)){
+                fixPointElevation();
+            }
+           
         }
     }
 
@@ -282,7 +288,7 @@
             if ((polyline.getType() == 0x20) ||
                 (polyline.getType() == 0x21) ||
                 (polyline.getType() == 0x22)) {
-                fixElevation();
+                fixPolylineElevation();
             }
 
             setResolution(polyline, name);
@@ -318,7 +324,7 @@
      * The elevation needs to be in feet.  So if it is given in meters then
      * convert it.
      */
-    private void fixElevation() {
+    private void fixPolylineElevation() {
         if (elevUnits == 'm') {
             String h = polyline.getName();
             try {
@@ -333,6 +339,21 @@
         }
     }
 
+    private void fixPointElevation() {
+        if (elevUnits == 'm') {
+            String h = point.getName();
+            try {
+                // Convert to feet.
+                int n = Integer.parseInt(h);
+                n *= METERS_TO_FEET;
+                point.setName(String.valueOf(n));
+
+            } catch (NumberFormatException e) {
+                // ok it wasn't a number, leave it alone
+            }
+        }
+    }
+
     /**
      * Called for each command in a POLYGON section.  There will be a Data
      * line consisting of a number of co-ordinates that must be 
separated out

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