Handle elevations in units besides meters (#226)

src/main/java/com/onthegomap/planetiler/basemap/layers/MountainPeak.java

@@ -113,14 +113,14 @@ public class MountainPeak implements
 
   @Override
   public void process(Tables.OsmPeakPoint element, FeatureCollector features) {
-    Integer meters = Parse.parseIntSubstring(element.ele());
+    Double meters = Parse.meters(element.ele());
     if (meters != null && Math.abs(meters) < 10_000) {
       var feature = features.point(LAYER_NAME)
         .setAttr(Fields.CLASS, element.source().getTag("natural"))
         .putAttrs(LanguageUtils.getNames(element.source().tags(), translations))
         .putAttrs(elevationTags(meters))
         .setSortKeyDescending(
-          meters +
+          meters.intValue() +
             (nullIfEmpty(element.wikipedia()) != null ? 10_000 : 0) +
             (nullIfEmpty(element.name()) != null ? 10_000 : 0)
         )

src/main/java/com/onthegomap/planetiler/basemap/util/Utils.java

@@ -49,9 +49,9 @@ public class Utils {
   }
 
   /** Returns a map with {@code ele} (meters) and {ele_ft} attributes from an elevation in meters. */
-  public static Map<String, Object> elevationTags(int meters) {
+  public static Map<String, Object> elevationTags(double meters) {
     return Map.of(
-      "ele", meters,
+      "ele", (int) Math.round(meters),
       "ele_ft", (int) Math.round(meters * 3.2808399)
     );
   }
@@ -61,7 +61,7 @@ public class Utils {
    * meters} can be parsed as a valid number.
    */
   public static Map<String, Object> elevationTags(String meters) {
-    Integer ele = Parse.parseIntSubstring(meters);
+    Double ele = Parse.meters(meters);
     return ele == null ? Map.of() : elevationTags(ele);
   }
 

src/test/java/com/onthegomap/planetiler/basemap/layers/AerodromeLabelTest.java

@@ -37,6 +37,36 @@ class AerodromeLabelTest extends AbstractLayerTest {
     ))));
   }
 
+  @Test
+  void testElevationFeet() {
+    assertFeatures(14, List.of(Map.of(
+      "ele", 100,
+      "ele_ft", 328
+    )), process(pointFeature(Map.of(
+      "aeroway", "aerodrome",
+      "name", "osm name",
+      "ele", "328'",
+      "aerodrome", "international",
+      "iata", "123",
+      "icao", "1234"
+    ))));
+  }
+
+  @Test
+  void testElevationFeetInches() {
+    assertFeatures(14, List.of(Map.of(
+      "ele", 100,
+      "ele_ft", 328
+    )), process(pointFeature(Map.of(
+      "aeroway", "aerodrome",
+      "name", "osm name",
+      "ele", "328' 1\"",
+      "aerodrome", "international",
+      "iata", "123",
+      "icao", "1234"
+    ))));
+  }
+
   @Test
   void testInternational() {
     assertFeatures(14, List.of(Map.of(

src/test/java/com/onthegomap/planetiler/basemap/layers/MountainPeakTest.java

@@ -75,6 +75,30 @@ class MountainPeakTest extends AbstractLayerTest {
     ))));
   }
 
+  @Test
+  void testElevationFeet() {
+    assertFeatures(14, List.of(Map.of(
+      "class", "volcano",
+      "ele", 30,
+      "ele_ft", 100
+    )), process(pointFeature(Map.of(
+      "natural", "volcano",
+      "ele", "100'"
+    ))));
+  }
+
+  @Test
+  void testElevationFeetInches() {
+    assertFeatures(14, List.of(Map.of(
+      "class", "volcano",
+      "ele", 31,
+      "ele_ft", 101
+    )), process(pointFeature(Map.of(
+      "natural", "volcano",
+      "ele", "100' 11\""
+    ))));
+  }
+
   @Test
   void testSaddle() {
     assertFeatures(14, List.of(Map.of(