/
kml.php
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/
kml.php
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<?php
######################################################################
# kml.php
#
# Accepts a query string of the form:
#
# kml.php?id=SEATTLE&mygrid=42&myquadrant=A
# or
# kml.php?lat=48.625&lon=-123.456
#
# and outputs a KML file of the appropriate grid.
#
# In the second case, where a lon and lat is given, provide the KML grid,
# and add a placemark for the given lon/lat
#
######################################################################
include_once("includes/gridFunctions.php");
include_once("includes/styles.php");
$TEST = 0;
$embed=isset($_GET['embed']);
$kmlHeader="Content-type: application/vnd.google-earth.kml+xml";
$kmzHeader="Content-type: application/vnd.google-earth.kmz";
$offset = "0.000000000001";
$altitude=0;
$myquadrant="E";
$quadrantDisplay="";
$lonlatflag=0;
if (isset($_GET['id'])) {
$sectional=$_GET['id'];
}
if (isset($_GET['mygrid'])) $mygrid=$_GET['mygrid'];
if (isset($_GET['myquadrant'])) $myquadrant=$_GET['myquadrant'];
if ($myquadrant != "E") $quadrantDisplay="-" . $myquadrant;
if (isset($_GET['lon'])) {
$pointLongitude=$_GET['lon'];
$lonlatflag=1;
}
if (isset($_GET['lat'])) $pointLatitude=$_GET['lat'];
# Determine the raw lon/lat of the top-left grid corner
$gridLon=$gridLat=$longitude=$latitude=0;
if ($lonlatflag) {
$result1 = lonlat2grid($pointLongitude, $pointLatitude);
$sectional = $result1['sectional'];
$mygrid= $result1['grid'];
$quadrant = $result1['quadrant'];
}
$result = grid2lonlat($sectional,$mygrid, $myquadrant, "raw");
$abbrev = $coordinates[strtoupper($sectional)]['Abbrev'];
$gridLon = $result['NW']['lon']; # Returns coords of NW corner of grid or quarter-grid
$gridLat = $result['NW']['lat']; #
$gridLabel = "$abbrev $mygrid$quadrantDisplay";
$filenameHeader = "Content-Disposition: attachment; filename=\"" .$abbrev . "_" . $mygrid . $quadrantDisplay . ".kml\"";
#echo "Lon: $gridLon Lat: $gridLat $abbrev - $mygrid \n";
if ($embed) {
if ($myquadrant == "E") {
$nw_coord = ($gridLon) . "," . ($gridLat) . ",0";
$ne_coord = ($gridLon + 0.25) . "," . ($gridLat) . ",0";
$se_coord = ($gridLon + 0.25) . "," . ($gridLat - 0.25) . ",0";
$sw_coord = ($gridLon) . "," . ($gridLat - 0.25) . ",0";
} else {
$nw_coord = ($gridLon) . "," . ($gridLat) . ",0";
$ne_coord = ($gridLon + 0.125) . "," . ($gridLat) . ",0";
$se_coord = ($gridLon + 0.125) . "," . ($gridLat - 0.125) . ",0";
$sw_coord = ($gridLon) . "," . ($gridLat - 0.125) . ",0";
}
$buffer="<?xml version=\"1.0\" encoding=\"UTF-8\"?>
<kml xmlns=\"http://www.opengis.net/kml/2.2\" xmlns:gx=\"http://www.google.com/kml/ext/2.2\" xmlns:kml=\"http://www.opengis.net/kml/2.2\" xmlns:atom=\"http://www.w3.org/2005/Atom\">
<Document>
<name>CAP Search Grids for $gridLabel</name>
<open>1</open>
<description><![CDATA[CAP Conventional Search Grids covering the $abbrev - $mygrid Sectional Chart<br><br>
By Capt Charles Jackson<br>nightbeacons@gmail.com<br>
based on original work by<br>
2Lt Landis Bennett, CAP<br>
landis@mac.com]]></description>
<Style id=\"s_ylw-pushpin_hl\">
<IconStyle>
<color>ff00aa55</color>
<scale>1.0</scale>
<Icon>
<href>https://" . $_SERVER['SERVER_NAME'] . "/images/markers/foo.png</href>
</Icon>
</IconStyle>
<LabelStyle>
<color>807fffff</color>
</LabelStyle>
<LineStyle>
<color>88000000</color>
<width>3</width>
</LineStyle>
</Style>
<Placemark>
<name>Polyline 1</name>
<description> xx</description>
<LineString>
<coordinates>$nw_coord $ne_coord $se_coord $sw_coord $nw_coord</coordinates>
</LineString>
</Placemark>
</Document>
</kml>";
} else {
# Fetch and output the Styles section
$styles = makePreamble($gridLabel); # Create the "<Style>" sections of the KML. No folders.
$firstRegion = makeRegion($gridLon,$gridLat);
$boundingBox = makeBBfolder($gridLon,$gridLat,$abbrev,$mygrid);
$gridFolder = makeGridFolder($gridLon,$gridLat,$abbrev,$mygrid);
$ending = " </Folder>
</Folder>
</Folder>
</Document>
</kml>\n";
$buffer = $styles . "<Folder>\n" . $firstRegion . $boundingBox . $gridFolder . $ending;
}
header($kmlHeader);
header($filenameHeader);
echo "$buffer";
# ===================================================================================================
# Create the Sectionals Region
# Return the text string
function makeRegion($lon,$lat)
{
$text=" <name>Sectionals</name>
<Region>
<LatLonAltBox>
<north>" . $lat . "</north>
<south>" . ($lat - 0.25) . "</south>
<east>" . ($lon + 0.25) . "</east>
<west>" . $lon . "</west>
<rotation>0</rotation>
<minAltitude>0</minAltitude>
<maxAltitude>0</maxAltitude>
</LatLonAltBox>
<Lod>
<minLodPixels>256</minLodPixels>
<maxLodPixels>4098</maxLodPixels>
<minFadeExtent>0</minFadeExtent>
<maxFadeExtent>0</maxFadeExtent>
</Lod>
</Region>\n";
return($text);
}
# ===================================================================================================
# Create the Bounding Box Folder
# Return the text string
# <coordinates> = lon/lat of the center of the grid
function makeBBfolder($gridLon,$gridLat,$abbrev,$mygrid)
{
$text=" <Folder>
<name>$abbrev</name>
<Placemark>
<name>$abbrev</name>
<styleUrl>#SectionalRed</styleUrl>
</Placemark>
<Placemark>
<name>$abbrev $mygrid</name> <!-- Name inside entire-area bounding box -->
<styleUrl>#SectionalRed</styleUrl>
<Point>
<coordinates>" . ($gridLon + 0.125) . "," . ($gridLat - 0.125) . ",0</coordinates>
</Point>
</Placemark>
</Folder>\n";
return($text);
}
# ===================================================================================================
# Create the Grids Folder
# Return the text string
#
function makeGridFolder($gridLon,$gridLat,$abbrev,$mygrid)
{
global $offset, $altitude;
$quadAry = array("E","A","B","C","D");
$north = $gridLat + 0.125;
$south = $gridLat - 0.375;
$east = $gridLon + 0.375;
$west = $gridLon - 0.125;
$gridLabel = sprintf("%03d", $mygrid);
$text=" <Folder>
<name>Grids</name>
<Folder>
<name>$abbrev $mygrid</name>
<Folder>
<name>Grid</name>
<Region>
<LatLonAltBox>
<north>$north</north>
<south>$south</south>
<east>$east</east>
<west>$west</west>
<rotation>0</rotation>
<minAltitude>0</minAltitude>
<maxAltitude>0</maxAltitude>
</LatLonAltBox>
<Lod>
<minLodPixels>130</minLodPixels>
<maxLodPixels>-1</maxLodPixels>
<minFadeExtent>0</minFadeExtent>
<maxFadeExtent>0</maxFadeExtent>
</Lod>
</Region>
<Placemark>
<name>$gridLabel</name>
<styleUrl>#GridRed</styleUrl>
<LineString>
<extrude>1</extrude>
<tessellate>1</tessellate>
<coordinates> $gridLon,$gridLat,$altitude " . ($gridLon + 0.25) . ",$gridLat,$altitude " . ($gridLon + 0.25) . "," . (($gridLat - 0.25) + $offset) . ",$altitude $gridLon," . (($gridLat - 0.25) + $offset) . ",$altitude $gridLon,$gridLat,$altitude </coordinates>
</LineString>
</Placemark>
</Folder>
<Folder>
<name>Alpha Grid</name>
<Region>
<LatLonAltBox>
<north>$north</north>
<south>$south</south>
<east>$east</east>
<west>$west</west>
<rotation>0</rotation>
<minAltitude>0</minAltitude>
<maxAltitude>0</maxAltitude>
</LatLonAltBox>
<Lod>
<minLodPixels>180</minLodPixels>
<maxLodPixels>-1</maxLodPixels>
<minFadeExtent>0</minFadeExtent>
<maxFadeExtent>0</maxFadeExtent>
</Lod>
</Region>
<Placemark>
<name>$gridLabel</name>
<styleUrl>#AlphaGridRed</styleUrl>
<LineString>
<extrude>1</extrude>
<tessellate>1</tessellate>
<coordinates> " . ($gridLon + 0.125) . ",$gridLat,$altitude " . ($gridLon + 0.125) . "," . (($gridLat - 0.25) + $offset) . ",$altitude " . ($gridLon + 0.25) . "," . (($gridLat - 0.25) + $offset) .",$altitude " . ($gridLon + 0.25) . "," . ($gridLat - 0.125) . ",$altitude $gridLon," . ($gridLat - 0.125) . ",$altitude </coordinates>
</LineString>
</Placemark>
</Folder>
<Folder>
<name>Numbers</name>
<Region>
<LatLonAltBox>
<north>$north</north>
<south>$south</south>
<east>$east</east>
<west>$west</west>
<rotation>0</rotation>
<minAltitude>0</minAltitude>
<maxAltitude>0</maxAltitude>
</LatLonAltBox>
<Lod>
<minLodPixels>300</minLodPixels>
<maxLodPixels>-1</maxLodPixels>
<minFadeExtent>0</minFadeExtent>
<maxFadeExtent>0</maxFadeExtent>
</Lod>
</Region>\n";
for ($quad=1; $quad <= 4; $quad++) {
$latFactor = 0.125 * (($quad > 2) + 0) + 0.0625;
$lonFactor = 0.125 * ((($quad/2) == ((int)($quad/2))) + 0) + 0.0625;
$text .= " <Placemark>
<name>$gridLabel " . $quadAry[$quad] . "</name>
<styleUrl>#AlphaGridRed</styleUrl>
<Point>
<coordinates>" . ($gridLon + $lonFactor) . "," . ($gridLat - $latFactor) . ",$altitude </coordinates>
</Point>
</Placemark>\n";
}
$text .= " </Folder>\n";
return($text);
}
# ===================================================================================================
?>