Maximum Lat and Long bounds for the world - Google

问题:

The Google Maps terrain view by default has unlimited panning of the map tile. You can use LatLngBounds() to limit this, but what are the maximum and minimum coordinates I should use to set the viewport as just the earth and not outside the map region?

Coordinates for North America:

var strictBounds = new google.maps.LatLngBounds(
    new google.maps.LatLng(28.70, -127.50), 
    new google.maps.LatLng(48.85, -55.90)
);

I've tried (+90, -180)(-90,180) to no luck.

回答1:

The links provided by @Marcelo & @Doc are good for understanding the derivation of the Lat Lng:

• http://www.cienciaviva.pt/latlong/anterior/gps.asp?accao=changelang&lang=en
• https://groups.google.com/forum/?hl=en&fromgroups=#!msg/google-maps-api/oJkyualxzyY/pNv1SE7qpBoJ
• http://en.wikipedia.org/wiki/Mercator_projection#Mathematics_of_the_Projection

But if you just want an answer for the maximum bounds for Google Maps:

Latitude: -85 to +85 (actually -85.05115 for some reason)

Longitude: -180 to +180

Try it for yourself on the Google Maps:

• https://maps.google.com/?q=85,180
• https://maps.google.com/?q=-85.05115,180

(You may need to Zoom Out. See how the pin is at the "edge" of the world - these are the limits)

So in your code Try:

var strictBounds = new google.maps.LatLngBounds(
    new google.maps.LatLng(85, -180),           // top left corner of map
    new google.maps.LatLng(-85, 180)            // bottom right corner
);

Please edit this wiki (or update your question) once you have the answer. Thanks

回答2:

See this post in the old Google Groups, which describes the math of the projection.

Quote:

the map doesn't start at 85 degrees, but rather the degree that makes the map square. This is can be simply calaculated as: atan(sinh(PI)) *180 / PI = 85.05112878....

Note that the tile calculation in that post is for the old API V2, but the projection should be the same.

回答3:

You may do the following to get the Max Lat and Long bounds of the world with the help of Google Maps :

1: Set the Zoom Level 1 of Google Maps While setting up the Google Map Stuff :

mapOptions = {
                zoom: 1,
 .....
}

2. Do the following to get NorthEast and SouthWest Bound of this Map :

map = new google.maps.Map(document.getElementById('map-canvas'), mapOptions);

     // NorthEast Latitude : 89.45016124669523
     var latNEValue =  map.getBounds().getNorthEast().lat();
    // NorthEast Longitude : 180
     var longNEValue = map.getBounds().getNorthEast().lng();
     // SouthWest Latitude : -87.71179927260242
     var latSWValue =  map.getBounds().getSouthWest().lat();
     // Southwest Latitude :  -180
     var longSWValue = map.getBounds().getSouthWest().lng();

3. It will give you following NorthEast and SouthWest Bounds :

NorthEast Latitude : 89.45016124669523

NorthEast Longitude : 180

SouthWest Latitude : -87.71179927260242

Southwest Longitude : -180

Similarly on Zoom Level- 0 , It give following points :

NorthEast Latitude : 89.99346179538875

NorthEast Longitude : 180

SouthWest Latitude : -89.98155760646617

Southwest Longitude : -180

Above trick helped me to solve my business problem which required max lat/long.

回答4:

for more details in GPS values you can read this article.

Article explain that :

• Latitude is the distance from the Equator measured along the Greenwich Meridian. This distance is measured in degrees and ranges between 0º to 90º North and South.
• Longitude is the distance from the Greenwich Meridian measured along the Equator. This distance is measured in degrees and ranges from 0º to 180º East and West.