Turf.js生成圆形多边形出现经度坐标异常问题求助

Hey there! I see exactly what's going wrong here—this is a super common gotcha with GIS libraries that follow GeoJSON standards.

The Root Cause #

Turf.js (and all GeoJSON-compliant tools) expects coordinates in the [longitude, latitude] order, but you've passed your center point as [latitude, longitude] instead.

Let's break it down clearly:

• Your original center: [20.659698486328125, -103.349609375] → Turf reads this as longitude=20.66, latitude=-103.35 (a spot way south near Antarctica, which explains the weird longitude values in your output)
• The correct order should be: [-103.349609375, 20.659698486328125] → longitude=-103.35, latitude=20.66 (the central Mexico location you intended)

Corrected Code #

Here's the fixed version of your code with the coordinate order swapped:

var center = [-103.349609375, 20.659698486328125]; // [longitude, latitude]
var options = { steps: 5, units: 'kilometers', options: {} };
var radius = 1;
var polygon = turf.circle(center, radius, options);

What to Expect Now #

When you run this corrected code, the generated polygon coordinates will be centered around your intended location, with both longitude and latitude values matching the area near -103.35, 20.66.

A quick pro tip: Always double-check coordinate order when working with GeoJSON-based libraries—this mix-up is one of the most frequent issues folks run into when getting started with turf.js or similar tools.

内容的提问来源于stack exchange，提问作者Saurabh Sharma