[OpenLayers-Users] KML layer in UTM coordinates

Sat Nov 1 15:30:09 EDT 2008

Dear Arnd Wippermann,

thanks a lot for the fast answer: included EPSG4326.js to the 
application (script-tag), the code is:
Proj4js.defs["EPSG:4326"] = "+proj=longlat +ellps=WGS84 +datum=WGS84 
+no_defs ";

Replaced 'EPSG:900913' with 'EPSG:4326' everywhere in the script and 
observed the same results for all the cases bevore:
The application makes problems navigating in the map when the kml-layer 
is activated. the kml is not beeing displayed, and in case 1a the IE7 
browser doesn't load the application at all.
In case 1a and 1b the firefox status-bar message is 'transfering data 
from spatialreference.org', in case 2 its getting hocked transfering 
data from the wms-server - but nothing happens?!

Best regards,
Jan

Arnd Wippermann escribió:
> Your KML is in EPSG:4326 not EPSG:900913. Perhaps thats all to change.
>
> Arnd Wippermann
>
>  
>
> -----Ursprüngliche Nachricht-----
> Von: users-bounces at openlayers.org [mailto:users-bounces at openlayers.org] Im
> Auftrag von Jan Schorn
> Gesendet: Samstag, 1. November 2008 19:38
> An: users at openlayers.org
> Betreff: [OpenLayers-Users] KML layer in UTM coordinates
>
> Dear OpenLayers community:
>
> First of all, thanks to all of you for the development of this great tool!
>
> And thanks for your time thinking about the problem i'm going to describe in
> the following frases:
> I'm struggeling with adding a GML (KML) layer to a UTM map. Thinking it has
> to do with coordinate transformations, I intented to adopt the solutions
> described in mails in the list the last montths, but i can't bring the
> application to work - using OpenLayers version 2.7.
>
> The Problem:
> I've a map in UTM coordinates (Zone 28N, WGS84. EPGS: 32628), the basemap is
> a wms layer which is beeing displayed fine.
> Now i want to add a Google Earth KML point layer, but it doesn't work (for
> the KML see the end of the mail).
>
> What I did:
> 1. Created the defs EPSG32628.js the code is
>
> Proj4js.defs["EPSG:32628"] = "+proj=utm +zone=28 +ellps=WGS84 
> +datum=WGS84 +units=m +no_defs ";
>
> 2. Included the 3 scripts: proj4js.js EPSG32628.js and EPSG90013.js to the
> application via the script-tag.
>
> Then starting to search for a solution do project the KML. I tried 2
> diferent ways described in the mailinglist, but without success. Even I
> don't know which way would be the smartest one.
>
> FIRST WAY was proceeding like discussed by Saris and Eric in
> http://openlayers.org/pipermail/users/2008-October/008170.html – there i
> tried both solucions without success:
> WAY 1a (see http://www.cenit-geosistemas.com/viewer/viewer1a.html ):
>
> var kml = new OpenLayers.Layer.GML("KML",
> "http://cenit-geosistemas.com/visor/kml.kml", {
> projection: new OpenLayers.Projection("EPSG:900913"),
> format: OpenLayers.Format.KML,
> formatOptions: {
> extractStyles: true,
> extractAttributes: true,
> }});
>
> WAY 1b ( see http://www.cenit-geosistemas.com/viewer/viewer1b.html ):
>
> var kml = new OpenLayers.Layer.GML("KML",
> "http://cenit-geosistemas.com/visor/kml.kml", {
> format: OpenLayers.Format.KML,
> formatOptions: {
> extractStyles: true,
> extractAttributes: true,
> internalProjection: new OpenLayers.Projection("ESPG:900913"),
> externalProjection: new OpenLayers.Projection("ESPG:32628")
> }});
>
> => SAME RESULTS for both cases:
> IE7 and firefox displays the basemap and if the kml is activated the
> application has problem when navegating in the map.
>
>
> SECOND WAY was redefining the preFeatureInsert Method of 
> OpenLayers.Layer.Vector the way Mike described in 
> http://www.nabble.com/reprojection-of-vector-layer-from-wgs84-to-sphericalme
> rcator-td14801474.html
> (see http://www.cenit-geosistemas.com/viewer/viewer2.html )
>
> preFeatureInsert = function(feature) {
> var src = new OpenLayers.Projection('EPSG:900913');
> var dest = new OpenLayers.Projection('EPSG:32628');
> for (var i = 0; i < feature.geometry.components.length; i++) {
> OpenLayers.Projection.transform(feature.geometry.components[i], src, dest);
> }
> };
>
> // the definition of the kml-layer now looks like:
>
> var kml = new OpenLayers.Layer.GML("KML", 
> "http://cenit-geosistemas.com/visor/kml.kml", {
> preFeatureInsert:preFeatureInsert,
> format: OpenLayers.Format.KML,
> formatOptions: {
> extractStyles: true,
> extractAttributes: true,
> }});
>
>
> Well, i even don't know if the problem has to do with the coordinate 
> transformation if it is caused by something else...
>
> Thanks a lot for any advice on how to display the KML in UTM coordinates 
> with the EPSG:32628 wms-basemap!
>
> Best regards,
> Jan
>
>
>
> ***************************************
>
> HERE COMES THE HTML AND THE KML:
>
> FIRST THE HTML
>
> <?xml version="1.0" encoding="iso-8859-1"?>
> <html xmlns="http://www.w3.org/1999/xhtml">
> <head>
> <title>Display a KML-file in UTM coordenates in OpenLayers</title>
> <link rel="stylesheet" href="mapa.css" type="text/css"></link>
> <script type="text/javascript" src="OpenLayers/OpenLayers.js"></script>
> <script type="text/javascript" src="proj4js/lib/proj4js.js"></script>
> <script type="text/javascript" 
> src="proj4js/lib/defs/EPSG900913.js"></script>
> <script type="text/javascript" src="proj4js/lib/defs/EPSG32628.js"></script>
> <script type="text/javascript" 
> src="OpenLayers/lib/Firebug/firebug.js"></script>
> <script type="text/javascript">
>
> var map;
>
> function init(){
> map = new OpenLayers.Map('map', {
> projection: new OpenLayers.Projection('EPSG:32628'),
> maxExtent: new OpenLayers.Bounds(319000, 3116000, 335300, 3128000),
> units: 'm',
> maxResolution: 'auto',
> controls: []
> });
>
> var wms = new OpenLayers.Layer.WMS("Ortofoto", 
> "http://idecan3.grafcan.es/ServicioWMS/OrtoExpress?", {
> 'layers': 'ortoexpress',
> 'srs':'EPSG:32628'
> });
>
> //HERE I INSERTED THE DIFERENT ATTEMPTS TO DEFINE THE KML-LAYER 
> DESCRIBED ABOVE!
> var kml = new OpenLayers.Layer.GML( -- see above --- );
>
> map.addLayers([wms,kml]);
>
> map.addControl(new OpenLayers.Control.PanZoom());
> map.addControl(new OpenLayers.Control.LayerSwitcher());
> map.addControl(new OpenLayers.Control.MouseDefaults());
>
> var center, zoom;
> center = new OpenLayers.LonLat(327150, 3122000);
> zoom = map.getZoomForExtent(map.maxExtent);
> map.setCenter(center, zoom);
> }
>
> </script>
> </head>
> <body onload="init()">
> <table width="100%" height="100%">
> <tr>
> <td style="vertical-align:top" width="250px">
> <div id="titulo">KML with LongLat coordinates in OpenLayers 
> (UTM)</div><br><br>
> <a href="http://www.cenit-geosistemas.com/viewer/kml.kml"> View the kml 
> en google earth </a><br>
> <p>Datos: Grafcan<br> SRS: WGS84 UTM Zone 28N</p>
> </td>
> <td>
> <div id="map"></div>
> </td>
> </tr>
> </table>
> </body>
> </html>
>
> *****
>
> AND THE KML
>
> <?xml version="1.0" encoding="UTF-8"?>
> <kml xmlns="http://earth.google.com/kml/2.2">
> <Document>
> <name>KML</name>
> <Style id="sh_sunny">
> <IconStyle>
> <scale>1.4</scale>
> <Icon>
> <href>http://maps.google.com/mapfiles/kml/shapes/sunny.png</href>
> </Icon>
> <hotSpot x="20" y="2" xunits="pixels" yunits="pixels"/>
> </IconStyle>
> </Style>
> <Style id="sn_sunny">
> <IconStyle>
> <scale>1.1</scale>
> <Icon>
> <href>http://maps.google.com/mapfiles/kml/shapes/sunny.png</href>
> </Icon>
> <hotSpot x="20" y="2" xunits="pixels" yunits="pixels"/>
> </IconStyle>
> </Style>
> <StyleMap id="msn_sunny">
> <Pair>
> <key>normal</key>
> <styleUrl>#sn_sunny</styleUrl>
> </Pair>
> <Pair>
> <key>highlight</key>
> <styleUrl>#sh_sunny</styleUrl>
> </Pair>
> </StyleMap>
> <Placemark>
> <name>Horno</name>
> <description></description>
> <LookAt>
> <longitude>-16.749093</longitude>
> <latitude>28.196578</latitude>
> <altitude>0</altitude>
> <range>14987.2345530687</range>
> <tilt>0</tilt>
> <heading>-5.761902813094587</heading>
> <altitudeMode>relativeToGround</altitudeMode>
> </LookAt>
> <styleUrl>#sn_horno</styleUrl>
> <Point>
> <coordinates>-16.749093, 28.196578,0</coordinates>
> </Point>
> </Placemark>
> </Document>
> </kml>
>
> _______________________________________________
> Users mailing list
> Users at openlayers.org
> http://openlayers.org/mailman/listinfo/users
>
>   