AdaWiki

====== Moved! ======

The Ultimate GPS tutorial has moved to [[http://learn.adafruit.com/adafruit-ultimate-gps|http://learn.adafruit.com/adafruit-ultimate-gps]] 

====== LOCUS Parser ======

The GPS LOCUS parser is still here though, use it below!

**Copy and paste all the text after the —-'s (starting with $PMTKLOX,0,86*67 and ending with $PMTK001,622,3*36)** 

<html>
<script type="text/javascript" src="http://ladyada.net/wiki/lib/scripts/jquery-1.7.2.min.js"></script>
<script type="text/javascript"><!--//--><![CDATA[//><!--

$(document).ready(function(){

      $("#parse").click(function(e){
	  
	  var ut = $("#unparsed_text").val();
	  ut = ut.replace(/[\s\xA0]+/g,'');
	  ut_arr = ut.split('$PMTKLOX,');
	  
	  //start and finish
	  started = 0;
	  ended = 0;
	  out_string = '';
	  out_xml = ' \n <dataset2 xmlns="xsdbooks">';
          out_kml_path = '<?xml version="1.0" encoding="UTF-8"?> \n \
 <kml xmlns="http://www.opengis.net/kml/2.2"> \n \
  <Document> \n \
    <name>GPS Path</name> \n \
    <description>Path parsed from GPS data.</description> \n \
    <Style id="yellowLineGreenPoly"> \n \
      <LineStyle> \n \
        <color>7f00ffff</color> \n \
        <width>4</width> \n \
        <gx:labelvisibility>0</gx:labelvisibility> \n \
      </LineStyle> \n \
      <PolyStyle> \n \
        <color>7f00ff00</color> \n \
      </PolyStyle> \n \
    </Style> \n \
    <Placemark> \n \
      <scale>0</scale> \n \
      <name>Begin</name> \n \
      <description>Start GPD Data</description> \n \
      <styleUrl>#yellowLineGreenPoly</styleUrl> \n \
      <LineString> \n \
        <extrude>1</extrude> \n \
        <tessellate>1</tessellate> \n \
        <altitudeMode>absolute</altitudeMode> \n \
        <coordinates>';
        
	  count = 0;
          polyline_points = new google.maps.MVCArray();
	  jQuery.each(ut_arr, function(index, value){
	      if(value.charAt(0) == '0'){
		// start parse!
		started = index;
	      }
	      else if(value.charAt(0) == '2'){
		ended = index;
	      }
	      else if(value.charAt(0) == '1'){
		utt_arr = value.split(',');
		// remove 6 LOCUS checksum
		utt_arr[-1] = utt_arr[1].slice(0,8);
		if(utt_arr.length == 26)
		  {
                   
		    utt_arr = utt_arr.slice(2);
		    for (var i = 0; i < 6; i++)
		      {
			count++;
			loc = utt_arr.slice(i*4, (i*4)+4);
			utc_date = new Date(parseInt(byteFlip(loc[0]), 16) * 1000);
			utc = utc_date.toString();
			type = loc[1].slice(0, 2);
			lat = hex2float(byteFlip( loc[1].slice(2) + loc[2].slice(0,2) ));

			long = hex2float(byteFlip( loc[2].slice(2) + loc[3].slice(0,2) ));
			height = parseInt(byteFlip( loc[3].slice(2, 6) ) , 16);
			checksum = loc[3].slice(6);
			
			type_string = '';
			if (type == '02'){
			  type_string = '3D-Fix';
}
else{
                          type_string = type;
                          }
                        if ( !(lat.toFixed() == 0 || long.toFixed() == 0 ) && lat <= 90 && lat >= -90 &&  long >= -180 && long <= 180 )
                        {
			out_string = out_string + utc + ' ' + type + ' ' + lat + ' ' + long + ' ' + height + ' ' + "\n";			
			
			out_xml = out_xml + " \
<Count Data=\""+count+"\">\n \
    <UTC>"+utc+"</UTC>\n \
    <FixType>"+type_string+"</FixType>\n \
    <Lat>"+lat.toFixed(6)+"</Lat>\n \
    <Lon>"+long.toFixed(6)+"</Lon>\n \
    <HGT>"+height+"</HGT>\n \
</Count> \n"; 
                        out_kml_path = out_kml_path + long + ',' + lat + ',' + height + '\n';
                        
                        googleMapArray[0].map.markerArray[count] = new google.maps.Marker({
                    position: new google.maps.LatLng(lat,
                                     long),
                    clickable: true,
                    visible: true,
                    title: 'GPS Data #' + count,
                });
                        googleMapArray[0].map.markerArray[count].setMap(googleMapArray[0].map);
                    
                        polyline_points.push(new google.maps.LatLng(lat, long));
			}
		      }

		  }
		else
		  {
		    out_string = out_string + "\n Line Parse Error " + utt_arr.length + " \n";;
		  }
	      }
	    });
	  
	  out_xml = out_xml + "\n </dataset2>";
          out_kml_path = out_kml_path + "\n </coordinates>\n \
      </LineString>\n \
    </Placemark>\n \
  </Document>\n \
</kml>\n";
	  //alert(out_xml);
	  $("#output_xml").html(htmlEntities(out_xml));
	  $("#output_kml_path").html(htmlEntities(out_kml_path));

          polyline = new google.maps.Polyline();
          polyline.setPath(polyline_points);
          polyline.setMap(googleMapArray[0].map);
                            googleMapArray[0].map.setCenter(new google.maps.LatLng(lat, long)); 
                            googleMapArray[0].map.setZoom(12); 
                            

	});
      

    });
function htmlEntities(str) {
  return String(str).replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;').replace(/"/g, '&quot;');
}

function byteFlip(hexString){
  returnString = '';
  for(i = 0; i< hexString.length; i+=2)    {
    returnString = hexString.slice(i, i+2) + returnString;
  }
  return returnString;
}

function hex2float(hexString) {
  num = parseInt(hexString, 16);
  var sign = (num & 0x80000000) ? -1 : 1;
  var exponent = ((num >> 23) & 0xff) - 127;
  var mantissa = 1 + ((num & 0x7fffff) / 0x7fffff);
  number = sign * mantissa * Math.pow(2, exponent);
  return number;
}

//--><!]]></script>





<textarea id="unparsed_text" rows="30" cols="100" ></textarea>
<br />
<input type="button" id="parse" value="Parse Data"/>
<br />
<table>
<tr>
<td>XML Output: <br /><textarea id="output_xml" rows="30" cols="100"></textarea></td>
<td>KML Output: <br /><textarea id="output_kml_path" rows="30" cols="100"></textarea></td>
</tr>
</table>

</html>


<googlemap3 width="80%" height="400px" type="normal" helper="off">

</googlemap3>
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