Point-Mapping Extension
This Point-Mapping Extension (MapPoint) combines a referenced image / map and point-coordinates. The result is a geo-referenced map with a geo-referenced point.
Über eine Extension können Punktkoordinaten mit georeferenzierten Karten verbunden werden. Diese Möglichkeit wird mit der Point-Mapping_Extension gezeigt. Eine zuvor hochgeladene Deutschlandkarte, wie sie in vielen Artikeln zur Veranschaulichgung von Ortschaften genutzt wird, wird mittels einer MediaWiki-Extension georefernziert. Zusammen mit den ebenfalls an die Extension übergebenen Punktkoordinaten wird eine Karte generiert, in der die Lage des Punktes angezeigt wird.
Inhaltsverzeichnis
Parameter
- $varURLMap: URL der Karte (z.B.: "http://www.giswiki.org/images/c/c1/DeutschlandRef.png";)
- $varURLPoint: URL des Punktsymbols (z.B.: "http://www.giswiki.org/images/1/1b/Reddot.gif";)
- $varMapWidth: = Breite der Karte im Ergebnis
- $PointExt: Punktsymbolgröße
- $A: Meters/Pixel in horizontaler x östlicher Richtung
- $E: Meters/Pixel in verticaler y nördlicher Richtung
- $C: x Easting UTM coordinate of center of upper left pixel in meters
- $F: y Northing UTM coordinate of center of upper left pixel in meters
- $varPointLon: Punktkoordinate (Geographische Länge)
- $varPointLat: Punktkoordinate (Geographische Breite)
To Do's
- Übergabe mehrere Punkte
- Kombination mit einer Vorlage (??)
-
Parameterübergabe in mehreren Zeilen -
Punkte mit URL verbinden - Externes URLSymbol (
) per CSS verschwinden lassen - Alternativtext für Punkte
Samples
Munich
Using a Red Dot
<MapPoint> http://www.giswiki.org/images/b/b0/DeutschlandGeoref.png http://www.giswiki.org/images/1/1b/Reddot.gif 6 144 0.028662571242 -0.017977324880 5.499161111111 55.115925000000 11.5750 48.1400 http://de.wikipedia.org/wiki/München Hier liegt München </MapPoint>
<MapPoint> http://www.giswiki.org/images/b/b0/DeutschlandGeoref.png http://www.giswiki.org/images/1/1b/Reddot.gif 6 144 0.028662571242 -0.017977324880 5.499161111111 55.115925000000 11.5750 48.1400 http://de.wikipedia.org/wiki/München München </MapPoint>
using the bavarian flag
<MapPoint> http://www.giswiki.org/images/b/b0/DeutschlandGeoref.png http://upload.wikimedia.org/wikipedia/commons/a/a3/Flag_de-bayern_lozenge.png 6 144 0.028662571242 -0.017977324880 5.499161111111 55.115925000000 11.5750 48.1400 http://de.wikipedia.org/wiki/München </MapPoint>
<MapPoint> http://www.giswiki.org/images/b/b0/DeutschlandGeoref.png http://upload.wikimedia.org/wikipedia/commons/a/a3/Flag_de-bayern_lozenge.png 20 144 0.028662571242 -0.017977324880 5.499161111111 55.115925000000 11.5750 48.1400 http://de.wikipedia.org/wiki/München </MapPoint>
Berlin
using a bigger symbol
<MapPoint> http://www.giswiki.org/images/b/b0/DeutschlandGeoref.png http://www.giswiki.org/images/1/1b/Reddot.gif 20 140 0.028662571242 -0.017977324880 5.499161111111 55.115925000000 13.394444 52.516667 http://de.wikipedia.org/wiki/Berlin </MapPoint>
<MapPoint> http://www.giswiki.org/images/b/b0/DeutschlandGeoref.png http://www.giswiki.org/images/1/1b/Reddot.gif 20 140 0.028662571242 -0.017977324880 5.499161111111 55.115925000000 13.394444 52.516667 http://de.wikipedia.org/wiki/Berlin </MapPoint>
Code
<?php
# MapPoint by Heinz-Josef Lücking h-j.luecking@t-online.de
#
# Copy this text into a file called "MapPoint.php" and save it into the directory "extensions"
# To activate the extension, include it from your LocalSettings.php
# with: include("extensions/MapPoint.php");
#
# visit http://www.giswiki.org
#
#
# Have fun
#
$wgExtensionFunctions[] = "wfMapPoint";
function wfMapPoint() {
global $wgParser;
$wgParser->setHook( "MapPoint", "renderMapPoint" );
}
function renderMapPoint( $input ) {
$varAr = explode("\n", $input);
# Image(Map) and Point-files
# e.g.:
# $varURLMap = "http://www.giswiki.org/images/c/c1/DeutschlandRef.png";
# $varURLPoint = "http://www.giswiki.org/images/1/1b/Reddot.gif";
# $varMapWidth = 140;
$varURLMap = $varAr[0];
$varURLPoint = $varAr[1];
$PointExt = $varAr[2]; # PointSize (width = height)
# Getting some image-information
$varMapWidth = $varAr[3]; # the width the image should be displayed
$size = getimagesize("$varURLMap");# the real size of the image
$height = $size[1]; # real height
$width = $size[0]; # real width
$varZoom = $varMapWidth / $width; # zoom-factor
$varMapHeigth = $height * $varZoom; # computed image-heigth
# Georeferencing the image (see http://en.wikipedia.org/wiki/World_file)
#
# A: meters/pixel in horizontal x Easting direction
# D: rotation about y axis, always 0
# B: rotation about x axis, always 0
# E: meters/pixel in vertical y Northing direction
# C: x Easting UTM coordinate of center of upper left pixel in meters
# F: y Northing UTM coordinate of center of upper left pixel in meters
#
# Use a dot for commas!
#
# Sample for the image above
#
# $A = 0.028662571242;
# $D = 0.000000000000;
# $B = 0.000000000000;
# $E = -0.017977324880;
# $C = 5.499161111111;
# $F = 55.115925000000;
$A = $varAr[4];
$D = 0;
$B = 0;
$E = $varAr[5];
$C = $varAr[6];
$F = $varAr[7];
# The point which shall be displayed on the map
# Coordinates must be Longitude and Latitude with decimal degrees
# Use a dot for commas!
#
# e.g. Munich:
# $varPointLon = 11.5750
# $varPointLat = 48.1400;
$varPointLon = $varAr[8];
$varPointLat = $varAr[9];
# Calculating the position of the point on the image
# $varPointX = ((11.5750 - 5.499161111111) / 0.028662571242) - 5;
# $varPointY = ((48.1400 - 55.115925000000) / -0.017977324880) - 5;
$xImg = ((($varPointLon - $C) / $A) * $varZoom) - ($PointExt / 2);
$yImg = ((($varPointLat - $F) / $E) * $varZoom) - ($PointExt / 2);
# Building the output
$MapRand = rand(); # add some random text to <div id="MapPoint...
$output = "<div id=\"MapPoint".$MapRand."\" class=\"MapPoint\" style=\"position: relative; left: 0px; top: 0px; width: ".$varMapWidth."px; height: ".$varMapHeigth."px; visibility: visible; background-color: white;\"> <img name=\"myMap\" style=\"position: absolute; top: 0pt; left: 0pt;\" src=\"".$varURLMap."\" height=\"".$varMapHeigth."\" width=\"".$varMapWidth."\"> <div id=\"myMapPoint\" class=\"\" style=\"position: relative; left: 0px; top: 0px; width: ".$varMapWidth."px; height: ".$varMapHeigth."px; visibility: visible;\"> <a href=\"".$varHRef."\"><img name=\"myMapPoint_\" style=\"opacity: 1.0; position: absolute; top: ".$yImg."px; left: ".$xImg."px;\" src=\"".$varURLPoint."\" height=\"".$PointExt."\" width=\"".$PointExt."\"></a></div></div>";
return $output;
}
?>
