Parse road speed limits. Display in popups for now. #51

backend/src/map_model.rs

@@ -76,6 +76,7 @@ pub struct Road {
     pub node2: osm_reader::NodeID,
     pub linestring: LineString,
     pub tags: Tags,
+    pub speed_mph: Option<f64>,
 }
 
 pub struct Intersection {
@@ -571,6 +572,7 @@ impl Road {
         let mut f = mercator.to_wgs84_gj(&self.linestring);
         // TODO Most of this is debug only
         f.set_property("id", self.id.0);
+        f.set_property("speed_mph", self.speed_mph);
         f.set_property("way", self.way.to_string());
         f.set_property("node1", self.node1.to_string());
         f.set_property("node2", self.node2.to_string());

backend/src/scrape.rs

@@ -114,6 +114,7 @@ pub fn scrape_osm(
             node1: e.osm_node1,
             node2: e.osm_node2,
             linestring: e.linestring,
+            speed_mph: parse_maxspeed_mph(&e.osm_tags),
             tags: e.osm_tags,
         })
         .collect();
@@ -287,3 +288,18 @@ fn is_road(tags: &Tags) -> bool {
     }
     true
 }
+
+// TODO Look at muv for something more rigorous
+fn parse_maxspeed_mph(tags: &Tags) -> Option<f64> {
+    let maxspeed = tags.get("maxspeed")?;
+    if let Ok(kmph) = maxspeed.parse::<f64>() {
+        return Some(kmph * 0.621371);
+    }
+    if let Some(mph) = maxspeed
+        .strip_suffix(" mph")
+        .and_then(|x| x.parse::<f64>().ok())
+    {
+        return Some(mph);
+    }
+    None
+}

web/src/edit/NeighbourhoodMode.svelte

@@ -295,6 +295,9 @@
         <Popup openOn="hover" let:props>
           <p>
             {props.shortcuts} shortcuts through {props.name ?? "unnamed road"}
+            {#if props.speed_mph}
+              ({Math.round(props.speed_mph)} mph)
+            {/if}
           </p>
           {#if action == "filter"}
             <div>