Google静态地图图块的角坐标

如何计算通过http://maps.googleapis.com/maps/api/staticmap获取的静态Google Map图像的角坐标（边界框）？center = 40.714728，-73.998672＆zoom = 12＆size = 400x400＆sensor = false？

我认为这并不是一个很难解决的问题，但我对准确性是否绝对正确表示怀疑。首先，您必须使用gdal2tiles代码将中心纬度/经度转换为像素。如果我愿意的话，可以将其转换为稳定的代码以查找角坐标。

这是一个Python代码：

tileSize = 256
initialResolution = 2 * math.pi * 6378137 / tileSize
# 156543.03392804062 for tileSize 256 pixels
originShift = 2 * math.pi * 6378137 / 2.0
# 20037508.342789244

def LatLonToMeters( lat, lon ):
        "Converts given lat/lon in WGS84 Datum to XY in Spherical Mercator EPSG:900913"

        mx = lon * originShift / 180.0
        my = math.log( math.tan((90 + lat) * math.pi / 360.0 )) / (math.pi / 180.0)

        my = my * originShift / 180.0
        return mx, my


def MetersToPixels( mx, my, zoom):
        "Converts EPSG:900913 to pyramid pixel coordinates in given zoom level"

        res = Resolution( zoom )
        px = (mx + originShift) / res
        py = (my + originShift) / res
        return px, py


# Dont forget you have to convert your projection to EPSG:900913
mx = -8237494.4864285 #-73.998672
my = 4970354.7325767 # 40.714728
zoom = 12

pixel_x, pixel_y = LatLonToMeters(MetersToPixels( mx, my, zoom))

然后，您可以通过查看下图使用加法或减法：

如果要找到A点：

x = pixel_x - 200
y = pixel_y + 200

或者您想找到B点：

x = pixel_x + 200
y = pixel_y + 200

最后要做的就是将像素转换为经/纬度。

def PixelsToMeters( px, py, zoom):
    "Converts pixel coordinates in given zoom level of pyramid to EPSG:900913"

    res = Resolution(zoom)
    mx = px * res - originShift
    my = py * res - originShift
    return mx, my

def MetersToLatLon( mx, my ):
    "Converts XY point from Spherical Mercator EPSG:900913 to lat/lon in WGS84 Datum"

    lon = (mx / originShift) * 180.0
    lat = (my / originShift) * 180.0

    lat = 180 / math.pi * (2 * math.atan(math.exp(lat * math.pi / 180.0)) - math.pi / 2.0)
    return lat, lon




#Result

llx, lly = MetersToLatLon( PixelsToMeters( x, y, zoom) )

所以我得到的结果是：

point A - UpperLeftLatLon = 40.7667530977 -74.0673365509
point B - UpperRightLatLon = 40.7667530977 -73.9300074493
point C - LowerRightLatLon = 40.6626622172 -73.9300074493
point D - LowerLeftLatLon = 40.6626622172 -74.0673365509

希望对您有帮助。