D3墨卡托功能NaN [英] D3 mercator function NaN

问题描述

我对D3墨卡托投影功能不太熟悉，并且得到了一些意想不到的结果.我想预测以下经纬度(在墨西哥的某个地方):

var geo = [19, -99]

我使用d3定义我的墨卡托投影

var projection = d3.geo.mercator();
projection(geo)
> [529.7418836818384, NaN]

这一点显然不在地图上.我到底在做什么错?谢谢！

解决方案

Javascript has it's lat and long round the opposite way to the rest of the world, so what you've given D3 is a longditue of 19 and a latitude of -99. Obviously there is no latitude of -99 hence the NaN. Now if you just reverse your geo variable to

var geo = [-99, 19]

all should be good.

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