[OpenLayers-Users] Re: more headaches with the twitter api

[Nicholas Efremov-Kendall]

Update:
it will place markers if fed two of the same coordinate, but not
tweet.geocoordinates[1],tweet.geo.coordinates[0].
so tweet.geo.coordinates[0],tweet.geo.coordinates[0] places the marker
somewhere in the middle of eurasia
tweet.geo.coordinates[1],tweet.geo.coordinates[1] goes off the map below
 antarctica below the americas
tweet.geo.coordinates[0],tweet.geo.coordinates[1] goes off the map
below Antarctica below africa...

no [expletive deleted] clue...

On Wed, Jun 22, 2011 at 3:49 PM, Nicholas Efremov-Kendall <
n.e.kendall at gmail.com> wrote:

> Hi all,
>
> I'm still trying to crack this nut, and to do so, I decided to strip out
> the need for any transformations, assuming that since both the w3c geoloc
> and twitter api's both use epsg 4326 natively. The geolocation works fine,
> without any issues, but the tweets still aren't being plotted in the correct
> place and I don't really know why. I've got an alert set on the point that's
> created, and from what I can tell it is being fed valid coordinates, the
> alert returns the following POINT(38.6315 -90.3462). I've plotted the coords
> by hand, and can verify that they're coming from the right area What I have
> noticed is that the coordinates seem to served as lat-long, rather than
> lon-lat (i.e. tweet.geo.coord[0] = lat), but reversing the coordinates
> doesn't result in markers getting added to the map, although the coords are
> returned in the right order.
>
> Now, as near as I can tell, this problem has to be with the coordinates
> being passed to my script from the twitter api itself. Maybe this has to do
> with the coords getting passed to me in the wrong data type, but at this
> point I'm stumped.
>
> full code is below
>
>
> var tweetz = new OpenLayers.Layer.Vector("Tweets", {styleMap: new
> OpenLayers.StyleMap({externalGraphic:
> "OpenLayers-2.11-rc1/img/marker-green.png", pointRadius: 10})});
> var marker = new OpenLayers.Layer.Vector("Marker", {styleMap: new
> OpenLayers.StyleMap({externalGraphic: "OpenLayers-2.11-rc1/img/marker.png",
> pointRadius: 10})});
> var map = new OpenLayers.Map('map');
> var tweets = [];
> var tweetsQ = [];
> var refreshQuery = '?=';
> function initGIS(){
> map.addControl(new OpenLayers.Control.LayerSwitcher());var wms = new
> OpenLayers.Layer.WMS(
>   "OpenLayers WMS",
>   "http://vmap0.tiles.osgeo.org/wms/vmap0",
>   {'layers':'basic'} );
> map.addLayer(wms);
> map.addLayer(tweetz);
> map.setCenter(new OpenLayers.LonLat(-90, 38),12);
> $(document).everyTime('30s', acquireTweets);
> $(document).everyTime('100ms', parseTweetsQ);
> getLoc();
> }
>
> function getLoc(){if (Modernizr.geolocation) {
> navigator.geolocation.getCurrentPosition(plotLoc,handle_error);} else
> {yqlgeo.get('visitor',norm_yql_resp);}}
>
> function createTWTsrcURL (){
> var temp = map.getCenter();
> return 'http://search.twitter.com/search.json' + refreshQuery +
> '&geocode=' + temp.lat +'%2C' + temp.lon + '%2C50km&rpp=100&callback=?';
> }
>
> function plotLoc (position){
> map.addLayer(marker);
> var feat = new OpenLayers.Feature.Vector(new
> OpenLayers.Geometry.Point(position.coords.longitude,position.coords.latitude));
> marker.addFeatures([feat]);
> var bounds = marker.getDataExtent();
> map.zoomToExtent(bounds);
> acquireTweets();
> }
>
> function acquireTweets(){
> $.getJSON(createTWTsrcURL(), function(data){
> if(data.results)
> $.each(data.results, function(i, tweet){
> if (tweet.geo || tweet.location)
> tweetsQ.push(tweet);
> });
> refreshQuery = data.refresh_url;
> });}
>
> function parseTweetsQ(){
> if (tweetsQ.length > 0) {
> var tweet = tweetsQ.pop();
> if (tweet.geo){
> tweet.point = new
> OpenLayers.Geometry.Point(tweet.geo.coordinates[0],tweet.geo.coordinates[1]);
> tweet.attributes = {};
> plotTwt(tweet);}}}
>
> function plotTwt(tweet){
> alert(tweet.point);
> var twtfeat = new OpenLayers.Feature.Vector(tweet.point);
> tweetz.addFeatures([twtfeat]);
> }
>
>
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