I am trying to get started with the Google Maps API, but I'm finding the documentation incredibly confusing. Does anyone know how to find the coordinates for an image for a ground overlay?
I copied the code here (https://developers.google.com/maps/documentation/javascript/overlays#GroundOverlays) and have it working on my website with my image. But when I try to change the coordinates from Newark to my location, the image does not appear at all. I've just been guesstimating the coordinates for the imageBounds and I'm guessing that's what is causing it not to work. Any help would be most appreciated.
This is my code (the LatLng coordinates are copied from the example):
function initialize() {
var newark = new google.maps.LatLng(40.740, -74.18);
var imageBounds = new google.maps.LatLngBounds(
new google.maps.LatLng(40.712216,-74.22655),
new google.maps.LatLng(40.773941,-74.12544));
var myOptions = {
zoom: 13,
center: newark,
mapTypeId: google.maps.MapTypeId.ROADMAP
}
var map = new google.maps.Map(document.getElementById("map_canvas"), myOptions);
var oldmap = new google.maps.GroundOverlay(
"http://www.mcography.com/beta/Accessibility_Map.png",
imageBounds);
oldmap.setMap(map);
}
I use the LatLng Marker and LatLng tooltip options of maps.google.com labs (link is in the right bar - bottom). Once I get it close, I simply make small tweaks to my LatLng numbers.
Also it looks like you may be using the wrong corners for your LatLngBounds box. It should be Southwest (bottom left) then Northeast (top right). Using the wrong corners has the effect of not showing an image.
Related
I want to know how can I change the position of the marker in the Google Map.
Currently I'm using:
var newlatlong = new google.maps.LatLng(place.geometry.location.lat(), place.geometry.location.lng());
map.setCenter(newlatlong);
marker.setPosition(newlatlong);
map.setZoom(10);
Can I hand code the position of the marker in the map other than the center position?
I mean map.setCenter(newlatlong);, Instead of setCenter Is there any other position available? or can I hand code the position in the map where the marker should appear?
Not sure why you are running the code twice...
But yes, you can pass latitude/longitude values directly to the setCenter method
map.setCenter({lat: -34, lng: 151});
Documentation: https://developers.google.com/maps/documentation/javascript/reference#Map
update after comments
If you want to move the map center so that the marker is specific position (in pixels), you can center on the marker and then use the .panBy method to move the map a fixed amount of pixels.
To create a marker:
var marker = new google.maps.Marker({
map : map,
position : newlatlong
})
to update the position of this marker:
marker.setPosition(newlatlong);
to put the center at the east of marker, for example:
map.setCenter(new LatLng(newlatlong.lat,newlatlong.lng + 1.0))
You can set the center of the map and the marker separately using different longitude and latitudes:
function initialize() {
var mapOptions = {
center: new google.maps.LatLng(41.512318, -72.979349);
};
var marker = new google.maps.Marker({
position: new google.maps.LatLng(41.513001, -72.983845)
});
};
This makes the marker slightly off center to the left. I used this in a current project of mine.
Not sure if this is possible but I have set my map up with custom styles and marker and I want to ensure the map shows at this level but with London in view. To do so I centred the map at a different location to my marker. I would like the map to zoom to my location if possible instead of the centre.
var myLatlng = new google.maps.LatLng('51.4525368','0.2481994');
var mapOptions = {
center: new google.maps.LatLng('51.4600368','0.0781994'),
mapTypeId: google.maps.MapTypeId.ROADMAP,
zoom: 11,
mapTypeControl: false,
scrollwheel:false
};
Also if anybody can tell me why my info window is displaying all funky I would appreciate too.
It has been tough to understand your question but if I got you right, you are trying to fit both center of London and your location on the map without setting a center on some position on the map. If that's correct, then you need google.maps.LatLngBounds() to get it done.
var bounds= new google.maps.LatLngBounds();
var London= new google.maps.LatLng(//London values);
var myLatLng = new google.maps.LatLng(//your values);
bounds.extend(London);
bounds.extend(myLatLng);
map.fitBounds(bounds);
Check if this serves your purpose.
I'm implementing a ground overlay that covers the entire world map. I have 2 issues at the moment.
First the image even if it's proportioned for the entire world map and I have stretched it (I think) properly, still displays somewhat weirdly stretched.
Second I'd like to tile the ground overlay to 'cover more worlds' when zoomed out excessively, but don't know if tiling is possible.
here's my code:
var start = new google.maps.LatLng(0, 0),
sw = new google.maps.LatLng(-84, -178), // South West
ne = new google.maps.LatLng(84, 178), // North East
imageBounds = new google.maps.LatLngBounds(sw, ne),
mapOptions = {
zoom: 3,
center: start,
mapTypeId: google.maps.MapTypeId.ROADMAP
},
map = new google.maps.Map(document.getElementById("map_canvas"), mapOptions),
oldmap = new google.maps.GroundOverlay("images/world.png", imageBounds);
oldmap.setMap(map);
You can see it here:
http://jsfiddle.net/maurizioliberato/A64nb/1/embedded/result/
Thanks in advance
Did you concern about projection when you stitch the images? Google Maps API uses Mercator Projection.
So I recommend you use a stitcher software to make a map image; PTGui, Hugin, etc.
Google Maps javascript API question - Map object recenters after applying KML layer. How do I prevent this?
I created a simple page with a map. When I apply a simple polygon KML, it recenters and zooms the map. Any ideas?
var myOptions = {
center: new google.maps.LatLng(27, -97),
zoom: 17,
mapTypeId: google.maps.MapTypeId.ROADMAP
};
var map = new google.maps.Map(document.getElementById("map_canvas"), myOptions);
var buildings = new google.maps.KmlLayer('https://mysite/site/buildings.xml');
buildings.setMap(map);
//i tried this to recenter and zoom, but no dice.
var posn = new google.maps.LatLng(27, -97);
map.setCenter(posn);
map.setZoom(17);
Sounds like you need the preserveViewport option. From the documentation:
By default, the input map is centered and zoomed to the bounding box of the contents of the layer. If this option is set to true, the viewport is left unchanged, unless the map's center and zoom were never set.
Pass it a KMLLayerOptions object through the constructor:
var buildings = new google.maps.KmlLayer('https://mysite/site/buildings.xml',{preserveViewport:true});
I want to draw marker on google maps. The marker data is from JSON.(from json file, not from database) and all data have a geometry (latitude, longitude)
An important thing is when I drag google maps, the browser will show some boundary.
And then the markers have to show on only shown maps.
After drag map again, the marker resets and show new marker in new boundary.
google.maps.event.addListener(map, 'dragend', function(event) {
var bd = map.getBounds();
var ne = bd.getNorthEast();
var sw = bd.getSouthWest();
var nw = new google.maps.LatLng(ne.lat(), sw.lng());
var se = new google.maps.LatLng(sw.lat(), ne.lng());
I can not progress any more..
Please give some example url or help..
So you've got the points for the 4 corners of some kind of boundary, and you want to put a marker in there. So you have a bunch of markers, but you only want to plot the ones that fall within the current bounds.
So something like this might work:
var latlng = new google.maps.LatLng(54.42838,-2.9623);
var marker = new google.maps.Marker({
position: latlng,
});
if (bd.contains(latlng)) {
marker.setMap(map);
}
You might want to setMap(null) for any markers that fall outwith the bounds.