Perf using a nearby METAR +Best Rwy calc for fields w/o rwy heading +…

app/src/main/assets/help.html

@@ -61,6 +61,8 @@ <h3>Avare Releases</h3>
   <li>ADS-B improvements</li>
   <li>ICAO format for entering GPS coordinates (see help)</li>
   <li>Removed Travel screen</li>
+  <li>Added METAR/Performance based on METAR of a nearby field</li>
+  <li>Added Performance for fields without runway heading</li>
  </ul>
  <b>7.6.8</b><br>
  <ul>
@@ -200,19 +202,37 @@ <h3 style="text-align: center;"><a name="0.1_Quick">Quick Start</a> -
  <p style="padding-left: 30px;">To temporarily hide your notes/drawings and return to
   normal Map functioning (Pan mode), just tap the Draw (Pan) button again.</p>
 
- <p>•<b>Long-press</b> any point on the chart (with GPS
-  acquired) to display text at the top of the screen giving
-  approximate compass direction and distance<b>From</b>,
-  followed by exact GPS bearing<b>To</b>, that point in relation to
-  your GPS location. Very handy when contacting ATC or making CTAF
-  calls!</p>
-
- <p style="padding-left: 30px;"><b>Note:</b> The current <b>Destination</b> used
-  by Avare for various features can be set after a long-press on the chart. Just tap either
-  the button that pops out containing the name or coordinates of the location you pressed;
-  or the button that pops out containing the word "Plan" to send that Destination to the flight plan.
+ <p>•<b>Long-press</b> any point on the chart to display a page containing:
+ <li style="padding-left: 30px;"><b>Action</b> buttons row:
+  <b>->D</b> sets up the point as Destination,
+  <b>+Plan</b> adds the point to the Plan,
+  <b>Plate</b> displays airport's plates,
+  <b>A/FD</b> displays a synthetic Chart Supplement page (the top dropdown opens scanned Chart Supplement),
+  <b>X</b> to close the page.</li>
+ <li style="padding-left: 30px;"><b>Airport FAA code</b> or <b>GPS coordinates</b> of the point
+  in <i>[name@]lat&lon</i> format; <i>name</i> is optional,</li>
+ <li style="padding-left: 30px;"><b>Position</b>: distance, compass direction and GPS bearing <b><u>FROM</u></b> the point,
+  followed by GPS bearing from your position <b><u>TO</u></b> the point, as well as <b>NavAids</b> (VOR) locations in format (VORName)(BearingFrom)(Distance).
+  Useful when contacting ATC or making CTAF calls.</li>
+
+ <br>If the point is an airport, weather is downloaded/not expired:
+ <li style="padding-left: 30px;">the airport's <b>METAR</b>
+  or the closest METAR found in a airport's radius (configurable in Preferences/Weather),</li>
+ <li style="padding-left: 30px;"><b>Performance</b> data for use at the airport:
+  density altitude, the best runway and its head/cross winds calculated using the METAR winds,</li>
+ <li style="padding-left: 30px;">the airport's <b>TAF</b>,
+ <li style="padding-left: 30px;"><b>Winds/Temp. Aloft</b> forecast reported by the closest meteorological station,</li>
+
+ <br>For all points:
+ <li style="padding-left: 30px;">nearby <b>Pireps</b></li>
+ <li style="padding-left: 30px;">nearby <b>Special Use Airspace</b> (SUA),</li>
+ <li style="padding-left: 30px;"><b>data source</b> for the weather and SUA:
+  data downloaded from internet or data retrieved with ADSB,</li>
+ <li style="padding-left: 30px;"><b>data timestamp</b>.</li>
+ </p>
+
   <a name="0.1_Find"></a>
- </p><p>•The "<b>Find</b>" button in the bottom Menu
+ <p>•The "<b>Find</b>" button in the bottom Menu
   activates a search box for a <span style="text-decoration: underline;">4-digit</span>
   Destination Airport code (or Navaid code, Fix code, etc.)
   that Avare uses to display a course, bearing, etc. This

app/src/main/java/com/ds/avare/storage/DataBaseHelper.java

@@ -2061,7 +2061,85 @@ public Metar getMETAR(String station) {
         return metar;        
     }
 
-
+    /**
+     *  Return metar closest to the input coordinates using query on weather.metars table
+     *  We query in a bounded 100mi wide/tall lat/lon box then sort based on distance from the input
+     *  see also http://stackoverflow.com/questions/3695224/sqlite-getting-nearest-locations-with-latitude-and-longitude#
+     * @param lat of the central point
+     * @param lon of the central point
+     * @return
+     */
+    public Metar getClosestMETAR(Double lat, Double lon) {
+
+        Metar metar = null;
+        final int searchRadius = mPref.getClosestMetarSearchRadius();
+        SquareBoxSearchHelper squareBoxSearchHelper = new SquareBoxSearchHelper(lat, lon, searchRadius);
+
+        String qry =
+                "select * from metars where 1=1 "
+                        + squareBoxSearchHelper.getWhereClause("latitude", "longitude")
+                        +";";
+
+        Cursor cursor = doQueryWeather(qry, getWeatherDb());
+
+        try {
+            if(cursor != null) {
+                if(cursor.moveToFirst()) {
+
+                    metar = new Metar();
+                    metar.rawText = cursor.getString(0);
+                    metar.time = cursor.getString(1);
+                    metar.stationId = cursor.getString(2);
+                    metar.flightCategory = cursor.getString(3);
+                    if (!cursor.isNull(4) && !cursor.isNull(5)) {
+                        metar.distance = Projection.getStaticDistance(lon, lat, cursor.getDouble(4), cursor.getDouble(5));
+
+                        GeomagneticField gmf = new GeomagneticField(lat.floatValue(), lon.floatValue(), 0, System.currentTimeMillis());
+                        Projection p = new Projection(cursor.getDouble(4), cursor.getDouble(5), lon, lat);
+                        metar.position =  Math.round(p.getDistance()) + Preferences.distanceConversionUnit + " " +
+                                p.getGeneralDirectionFrom(-gmf.getDeclination());
+                    }
+                }
+            }
+        }
+        catch (Exception e) {
+        }
+
+        closesWeather(cursor);
+        return metar;
+    }
+
+    private class SquareBoxSearchHelper {
+        private double lat, lon;
+        private Coordinate top;
+        private Coordinate bottom;
+        private Coordinate left;
+        private Coordinate right;
+        private double fudge;
+
+        public SquareBoxSearchHelper(double lat, double lon, double search_radius) {
+            this.lat = lat; this.lon = lon;
+            top = Projection.findStaticPoint(lon, lat, 0, search_radius);
+            bottom = Projection.findStaticPoint(lon, lat, 180, search_radius);
+            left = Projection.findStaticPoint(lon, lat, 270, search_radius);
+            right = Projection.findStaticPoint(lon, lat, 90, search_radius);
+            fudge = Math.pow(Math.cos(Math.toRadians(lat)), 2);
+        }
+
+        public String getWhereClause(String latField, String lonField) {
+            return " and "+latField+" < "+top.getLatitude()+
+                    " and "+latField+" > "+bottom.getLatitude()+
+                    " and "+lonField+" < "+right.getLongitude()+
+                    " and "+lonField+" > "+left.getLongitude()+
+                    " order by (("    +lat+" - "+latField+") * ("+lat+" - "+latField
+                    +") + ("+lon+" - "+lonField+") * ("+lon+" - "+lonField
+                    +") * "+fudge+")";
+        }
+
+    }
+
+
+
     /**
      * 
      * @param lon

app/src/main/java/com/ds/avare/storage/DataSource.java

@@ -206,7 +206,17 @@ public Metar getMETAR(String station) {
     }
 
     /**
-     * 
+     *
+     * @param lat
+     * @param lon
+     * @return
+     */
+    public Metar getClosestMETAR(Double lat, Double lon) {
+        return dbHelper.getClosestMETAR(lat, lon);
+    }
+
+    /**
+     *
      * @return
      */
     public LinkedList<Airep> getAireps(double lon, double lat) {

app/src/main/java/com/ds/avare/storage/Preferences.java

@@ -1146,6 +1146,18 @@ public boolean isVerticalPfd() {
         return mPref.getBoolean(mContext.getString(R.string.VerticalPfd), false);
     }
 
+    public int getClosestMetarSearchRadius() {
+        try {
+            return (Integer.parseInt(mPref.getString(mContext.getString(R.string.NearestMETARRadius), "0")));
+        } catch (Exception x) {
+            return 0;
+        }
+    }
+
+    public void setClosestMetarSearchRadius(int set) {
+        mPref.edit().putString(mContext.getString(R.string.NearestMETARRadius), Integer.toString(set)).commit();
+    }
+
     public int getWindsAloftCeiling() {
         try {
            return Integer.parseInt(mPref.getString(mContext.getString(R.string.WindsAloftCeiling), "39"));

app/src/main/java/com/ds/avare/utils/WeatherHelper.java

@@ -13,6 +13,8 @@
 
 import android.util.Pair;
 
+import com.ds.avare.weather.Metar;
+
 import java.util.LinkedList;
 import java.util.Locale;
 
@@ -75,7 +77,8 @@ public static String formatWeather(String weather) {
         weather = weather.replace("AMD ", "");
         weather = weather.replace("\n\n", "\n");
         weather = weather.replace(" FM", "\nFM");
-        weather = weather.replace("BECMG", "\nBECMG"); 
+        weather = weather.replace("TEMPO", "\nTEMPO");
+        weather = weather.replace("BECMG", "\nBECMG");
         return weather;
     }
 
@@ -90,10 +93,12 @@ public static String formatWeatherHTML(String weather, boolean translate) {
         weather = weather.replace("\n", "<br>");
         if(translate) {
             weather = weather.replace(" FM", "</br>FM(From)<br>");
+            weather = weather.replace("TEMPO", "</br>TEMPO(Temporarily)<br>");
             weather = weather.replace("BECMG", "</br>BECMG(Becoming)<br>");
         }
         else {
             weather = weather.replace(" FM", "</br>FM");
+            weather = weather.replace("TEMPO", "</br>TEMPO");
             weather = weather.replace("BECMG", "</br>BECMG");
         }
         return weather;
@@ -174,21 +179,42 @@ public static String formatTafHTML(String weatherAll, boolean translate) {
         weather = weather.replaceAll("VV", "<font color='#ff2a00'>VV" + (translate ? "(Vertical Visibility)" : "") + "<font color='white'>");
         weather = weather.replaceAll("CB", "<font color='#ff2a00'>CB" + (translate ? "(Cumulonimbus)" : "") + "<font color='white'>");
         weather = weather.replaceAll("WS", "<font color='#ff54f9'>WS" + (translate ? "(Wind Shear)" : "") + "<font color='white'>");
-        
+
         weather = weather.replaceAll(" 9999 ", " 9999" + (translate ? "(Visibility > 7SM) " : ""));
         weather = weather.replaceAll("QNH", "QNH" + (translate ? "(Minimum Altimeter)" : ""));
         weather = weather.replaceAll("INS", "INS" + (translate ? "(Inches)" : ""));
 
         for(int i = 1 ; i < strip.length; i++) {
-            
+
             String weather1 = strip[i];
-            
+
             weather += " RMK" + (translate ? "(Remark) " : " ") + weather1;
         }
 
         return weather;
     }
 
+    public enum DistantMetarFormat { NoStationId, WithStationId }
+
+    /**
+     * @param metar
+     * @param format
+     * @param airport
+     * @return the metar decorated with the metar's position off airport name, if that metar is
+     *         from a different field; for example for 3GV we'd print:
+     *          METAR (8nm SW of 3GV)
+     */
+    public static String formatDistantMetarHeader(Metar metar, DistantMetarFormat format, String airport) {
+        String stationId = format == DistantMetarFormat.WithStationId ?
+                "using " + metar.stationId + " "
+                : "";
+        return metar.distance > 0 ?
+                String.format(Locale.getDefault(),
+                        "<font color=\"red\">(%s%s %s)</font> ",
+                        stationId, metar.position, airport)
+                : "";
+    }
+
     /**
      * Split string on the second space
      * @param s
@@ -221,6 +247,7 @@ public static String formatMetarHTML(String weatherAll, boolean translate) {
          */
         identAndTime = identAndTime.replaceAll("SPECI", "SPECI" + (translate ? "(Special/unscheduled)" : ""));
 
+
         /*
          * Remarks
          */
@@ -322,6 +349,7 @@ public static String formatMetarHTML(String weatherAll, boolean translate) {
         return identAndTime + " " + weather;
     }
 
+
     /**
      * Color code winds
      * @param weather
@@ -740,8 +768,8 @@ public static String getBestRunway(String metar, LinkedList<String> runways) {
 
         String wind = "";
         double dir = 0;
-        double spd0 = 0;
-        double spd1 = 0;
+        double windspeed = 0;
+        double gustspeed = 0;
 
         boolean windset = false;
 
@@ -763,11 +791,11 @@ public static String getBestRunway(String metar, LinkedList<String> runways) {
                     }
                     dir = Double.parseDouble(tmp);
                     // next 2 digits are speed
-                    spd0 = Double.parseDouble(wind.substring(3, 5));
+                    windspeed = Double.parseDouble(wind.substring(3, 5));
                     // could be gusting
                     if(wind.contains("G")) {
                         // gusting to
-                        spd1 = Double.parseDouble(wind.substring(6, 8));
+                        gustspeed = Double.parseDouble(wind.substring(6, 8));
                     }
                     windset = true;
                     continue;
@@ -777,53 +805,50 @@ public static String getBestRunway(String metar, LinkedList<String> runways) {
         catch (Exception e) {
         }
 
-        double head1 = 0;
-        double head0 = 0;
-        double cross1 = 0;
-        double cross0 = 0;
+        double headgusts = 0;
+        double headwind = 0;
+        double crossgusts = 0;
+        double crosswind = 0;
 
         if(windset) {
             /*
-             * Find best wind aligned runway
+             * Find best wind-aligned runway name
              */
-            double maxW = -1E10;
-            String best = "";
+            double maxWind = -1E10;
+            String best_description = "";
             for(String s : runways) {
-                String run[] = s.split(",");
+                String runway_name_and_heading[] = s.split(",");
                 try {
-                    double rhead = Double.parseDouble(run[1]);
+                    double rwy_heading = runway_name_and_heading.length == 2
+                            ? Double.parseDouble(runway_name_and_heading[1])  // parse rwy heading
+                            : Double.parseDouble(runway_name_and_heading[0])*10; // parse rwy name - case of private fields which have no heading info
                     // find cross and head wind components
                     // aviation formulary
-                    head0 = spd0 * Math.cos(Math.toRadians(dir - rhead));
-                    if(head0 > maxW) {
+                    headwind = windspeed * Math.cos(Math.toRadians(dir - rwy_heading));
+                    if(headwind > maxWind) {
                         // find runway with max headwind component
-                        maxW = head0;
-                        cross0 = spd0 * Math.sin(Math.toRadians(dir - rhead));
-                        if(spd1 != 0) {
-                            head1 = spd1 * Math.cos(Math.toRadians(dir - rhead));
-                            cross1 = spd1 * Math.sin(Math.toRadians(dir - rhead));
-                        }
-                        best = run[0];
-                        best += "\n " + Math.abs((int)head0);
-                        if(spd1 != 0) {
-                            best += "G" + Math.abs((int)head1);
-                        }
-                        // T = tail, H = head, L = left, R = right
-                        best += (head0 < 0 ? "KT Tail" : "KT Head");
-                        best += "\n " + Math.abs((int)cross0);
-                        if(spd1 != 0) {
-                            best += "G" + Math.abs((int)cross1);
+                        maxWind = headwind;
+                        crosswind = windspeed * Math.sin(Math.toRadians(dir - rwy_heading));
+                        if(gustspeed != 0) {
+                            headgusts = gustspeed * Math.cos(Math.toRadians(dir - rwy_heading));
+                            crossgusts = gustspeed * Math.sin(Math.toRadians(dir - rwy_heading));
                         }
-
-                        best += (cross0 < 0 ? "KT Left X" : "KT Right X");
+                        best_description = runway_name_and_heading[0] // rwy name
+                                         + "\n " + Math.abs((int)headwind)
+                                         + (gustspeed != 0 ? "G" + Math.abs((int)headgusts) : "")
+                                         // T = tail, H = head, L = left, R = right
+                                         + (headwind < 0 ? "KT Tail" : "KT Head")
+                                         + "\n " + Math.abs((int)crosswind)
+                                         + (gustspeed != 0 ? "G" + Math.abs((int)crossgusts) : "")
+                                         + (crosswind < 0 ? "KT Left X" : "KT Right X");
                     }
                 }
                 catch (Exception e) {
                     continue;
                 }
 
             }
-            return best;
+            return best_description;
         }
 
         return "";