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leaflet-polar-graticule

v0.1.3

Published

Grid of latitidue and longitude lines, with support for polar map projections

Downloads

317

Readme

Leaflet.Graticule

Generate a graticule grid of latitude and longitude lines. The graticule inclues labels by default, and support for maps in polar projections.

This is heavily based on the original L.Graticule plugin and labels are provided using the Leaflet Textpath plugin.

Usage

L.graticule(options)

Create a new Graticule layer which inherits from L.GeoJSON. The following options have been added:

  • intervalLat: the gap between each line of latitude, in degrees
  • intervalLon: the gap between each line of longtitude, in degrees
  • latBounds: the latitudes to draw the graticule over (default: [-90,90])
  • lngBounds: the longitudes to draw the graitcule over (default: [-180,180])
  • centerLatLabels: center labels along the graticule (default: true)
  • centerLngLabels: center labels along the graticule (default: false)
  • style: path options for the generated lines

Example

// Add a basic graticule with divisions every 20 degrees
// as a layer on a map
L.graticule().addTo(map);

// Specify divisions every 10 degrees
L.graticule({ intervalLat: 10, intervalLng: 10 }).addTo(map);

// Specify bold red lines instead of thin grey lines
L.graticule({
    style: {
        color: '#f00',
        weight: 10
    }
}).addTo(map);

Demos

For Antarctica

For Arctic

Installation

If you are using npm:

npm install leaflet-polar-graticule

Otherwise, its available through unpkg. In your html, add:

<script src="https://unpkg.com/[email protected]/L.Graticule.min.js" integrity="sha384-ZnsQFe3F+Xr0kzjaMGtAPO+41YGRanGndF7uefFEA/N87dUB4kHhq+xv7GHnWbh/" crossorigin="anonymous"></script>

Advanced Use

If you don't like how the labels are displayed, you can specify a custom display function. (See onEachFeature in L.Graticule.js)