背景:
我正在使用运输路线,谷歌提供足够远的路线点来创造“形状”.这些是您在Google地图中看到的巴士/火车路线.
我的要求:
谷歌的积分远远不足以创造直线.但是我想要一个点,比方说,5米.
问题:
所以,说我有两点[lat,long]:
[-33.8824219918503,151.206686052582]和[-33.8815434600467,151.206556440037]
鉴于这两点,我可以计算它们之间的距离.说为了争论它是1公里.
所以我们可以想象在这两点之间有一条假想的直线.
如何为每个(例如5米)生成该假想线的坐标?
解决方法
Destination point given distance and bearing from start point适用于您的问题:
class Numeric def to_rad self * Math::PI / 180 end def to_deg self * 180 / Math::PI end end include Math R = 6371.0 def waypoint(φ1,λ1,θ,d) φ2 = asin( sin(φ1) * cos(d/R) + cos(φ1) * sin(d/R) * cos(θ) ) λ2 = λ1 + atan2( sin(θ) * sin(d/R) * cos(φ1),cos(d/R) - sin(φ1) * sin(φ2) ) λ2 = (λ2 + 3 * Math::PI) % (2 * Math::PI) - Math::PI # normalise to -180..+180° [φ2,λ2] end φ1,λ1 = -33.to_rad,-71.6.to_rad # Valparaíso φ2,λ2 = 31.4.to_rad,121.8.to_rad # Shanghai d = R * acos( sin(φ1) * sin(φ2) + cos(φ1) * cos(φ2) * cos(λ2 - λ1) ) θ = atan2( sin(λ2 - λ1) * cos(φ2),cos(φ1) * sin(φ2) - sin(φ1) * cos(φ2) * cos(λ2 - λ1) ) waypoints = (0..d).step(2000).map { |d| waypoint(φ1,d) } markers = waypoints.map { |φ,λ| "#{φ.to_deg},#{λ.to_deg}" }.join("|") puts "http://maps.googleapis.com/maps/api/staticmap?size=640x320&sensor=false&markers=#{markers}"
每隔2,000公里生成一个谷歌静态地图链接,其中包括从瓦尔帕莱索到上海的航点:
http://maps.googleapis.com/maps/api/staticmap?size=640x320&sensor=false&markers=-33.0,-71.60000000000002|-32.54414813683714,-93.02142653011552|-28.59922979115139,-113.43958859125276|-21.877555679819015,-131.91586675556778|-13.305784544363858,-148.5297601858932|-3.7370081151180683,-163.94988578467394|6.094273692291354,-179.03345538133888|15.493534924596633,165.33401731030006|23.70233917422386,148.3186618914762|29.83806632244171,129.34766276764626