geography-markup-language

Parse Geography Markup Language in Pure JavaScript

install

``bash
npm install geography-markup-language
`

usage

- Envelope
- LineString
- Polygon
- Point
- Geometry

$3

`js
import { Envelope } from "geography-markup-language";

const xml =

42.943 -71.032
43.039 -69.856

;

Envelope(xml)
{
srs: null,
corners: [
[42.943, -71.032], // lower corner
[43.039, -69.856] // upper corner
]
}

// convert Envelope to GeoJSON
Envelope(xml, { format: "geojson" })
{
type: "Feature",
bbox: [-71.032, 42.943, -69.856, 43.039],
properties: {},
geometry: {
type: "Polygon",
coordinates: [
[
[-71.032, 43.039],
[-71.032, 42.943],
[-69.856, 42.943],
[-69.856, 43.039],
[-71.032, 43.039]
]
]
}
}
`

$3


`js
import { LineString } from "geography-markup-language";

const xml =


45.256 -110.45 46.46 -109.48 43.84 -109.86


;

LineString(xml)
{
type: "LineString",
coords: [
[45.256, -110.45],
[46.46, -109.48],
[43.84, -109.86]
]
}

// convert line string into geojson
LineString(xml, { format: "geojson" });
{
type: "Feature",
properties: {},
geometry: {
type: "LineString",
coordinates: [
[-110.45, 45.256],
[-109.48, 46.46],
[-109.86, 43.84]
]
}
}
`

$3


`js
import { Polygon } from "geography-markup-language";

const xml =



0,0 100,0 100,100 0,100 0,0




1,1 99,1 99,99 1,99 1,1



;

Polygon(xml, { format: "geojson" });
{
type: "Feature",
properties: {},
geometry: {
type: "Polygon",
coordinates: [
[
[0, 0],
[0, 100],
[100, 100],
[100, 0],
[0, 0]
],
[
[1, 1],
[1, 99],
[99, 99],
[99, 1],
[1, 1]
]
]
}
}
`

$3


`js
import { Point } from "geography-markup-language";

// xml for Hawaii
const xml = 19.741755 -155.844437 ;

Point(xml, { format: "geojson" })
{
type: "Feature",
properties: {},
geometry: {
type: "Point",
coordinates: [-155.844437, 19.741755]
}
}
`

$3


If you are not sure what type of geometry you are parsing, you can call Geometry.
It will automatically determine which geometry is being parsed and internally call Envelope, LineString, Point, or Polygon accordingly.
`js
import { Geometry } from "geography-markup-language";

// xml for Hawaii
const xml = 19.741755 -155.844437 ;

Geometry(xml, { format: "geojson" })
{
type: "Feature",
properties: {},
geometry: {
type: "Point",
coordinates: [-155.844437, 19.741755]
}
}
``

references

- Geography Markup Language (Wikipedia)
- OGC GeoRSS Encoding Standard