@openaip/yaixm-to-geojson
v0.5.0
Published
Converts YAIXM to GeoJSON. YAIXM is a simplified version of the FAA/EUROCONTOL Aeronautical Information Exchange Model (AIXM) using YAML.
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YAIXM to GeoJSON Converter
A utility that converts YAIXM format into GeoJSON for Node. This tool is intended to work with the YAIXM format
used in the unofficial UK Airspace Repository. Currently, the logic only
supports reading airspace YAIXM definitions.
Internally, the logic uses parts of our OpenAIR Parser to also validate the given YAIXM definitions.
Reads YAIXM airspace definition:
airspace:
- name: ABERDEEN CTA
id: aberdeen-cta
type: CTA
class: D
geometry:
- seqno: 1
upper: FL115
lower: 1500 ft
boundary:
- line:
- 572153N 0015835W
- 572100N 0015802W
- 572100N 0023356W
- arc:
dir: cw
radius: 10 nm
centre: 571834N 0021602W
to: 572153N 0015835W
- seqno: 2
upper: FL115
lower: 1500 ft
boundary:
- line:
- 571522N 0015428W
- 570845N 0015019W
- arc:
dir: cw
radius: 10 nm
centre: 570531N 0020740W
to: 570214N 0022458W
- line:
- 570850N 0022913W
- arc:
dir: ccw
radius: 10 nm
centre: 571207N 0021152W
to: 571522N 0015428W
- seqno: 3
upper: FL115
lower: 3000 ft
boundary:
- line:
- 572100N 0023356W
- 570015N 0025056W
- 565433N 0023557W
- 565533N 0020635W
- arc:
dir: cw
radius: 10 nm
centre: 570531N 0020740W
to: 570214N 0022458W
- line:
- 571520N 0023326W
- arc:
dir: cw
radius: 10 nm
centre: 571834N 0021602W
to: 572100N 0023356W
- name: ARGYLL CTA
type: CTA
class: E
geometry:
- seqno: 1
class: E
rules:
- TMZ
upper: FL195
lower: 5500 ft
boundary:
- line:
- 561844N 0054648W
- 560727N 0050308W
- 560127N 0044028W
- 560000N 0044400W
- 555356N 0045343W
- 555825N 0051042W
- 560939N 0055411W
- seqno: 2
rules:
- TMZ
upper: FL195
lower: FL115
boundary:
- line:
- 564819N 0062031W
- 561807N 0054423W
- 561844N 0054648W
- 560939N 0055411W
- 562501N 0065609W
- 563408N 0064847W
- 562552N 0061508W
- 564248N 0063539W
- seqno: 3
rules:
- TMZ
upper: FL195
lower: FL105
boundary:
- line:
- 553039N 0053655W
- 552543N 0050000W
- 551527N 0050000W
- 552057N 0054102WOutputs a GeoJSON FeatureCollection with the following JSON schema:
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"$id": "https://adhoc-schemas.openaip.net/schemas/parsed-yaixm-airspace.json",
"description": "JSON Schema for the GeoJSON FeatureCollection returned by this converter.",
"type": "object",
"properties": {
"type": {
"type": "string",
"enum": [
"FeatureCollection"
],
"description": "A GeoJSON FeatureCollection object that contains all airspace features."
},
"features": {
"type": "array",
"items": {
"allOf": [
{
"type": "object",
"properties": {
"type": {
"type": "string",
"enum": [
"Feature"
]
},
"properties": {
"type": "object",
"properties": {
"name": {
"type": "string",
"description": "The airspace's name."
},
"type": {
"type": "string",
"enum": [
"CTA",
"TMA",
"CTR",
"ATZ",
"DANGER",
"PROHIBITED",
"RESTRICTED",
"WARNING",
"AERIAL_SPORTING_RECREATIONAL",
"RMZ",
"TMZ",
"MATZ",
"GLIDING_SECTOR"
],
"description": "The airspace's type."
},
"class": {
"type": "string",
"enum": [
"A",
"B",
"C",
"D",
"E",
"F",
"G",
"UNCLASSIFIED"
],
"description": "The airspace's class."
},
"activity": {
"type": "string",
"enum": [
"NONE",
"PARACHUTING",
"AEROBATICS",
"AEROCLUB_AERIAL_WORK",
"ULM",
"HANG_GLIDING"
],
"description": "Property that adds metadata about specific type of arial/sporting areas. Is 'NONE' by default."
},
"upperCeiling": {
"$ref": "#/definitions/verticalLimit"
},
"lowerCeiling": {
"$ref": "#/definitions/verticalLimit"
},
"activatedByNotam": { "type": "boolean", "description": "If true, the airspace is activated by a NOTAM." },
"groundService": {
"type": "object",
"properties": {
"callsign": { "type": "string" , "example": "ABERDEEN APPROACH"},
"frequency": { "type": "string", "example": "118.000" }
},
"description": "The ground service callsign and frequency if available.",
"required": [
"callsign",
"frequency"
],
"additionalProperties": false
},
"remarks": {
"type": "string",
"description": "A remarks field. If available, this will contain content of the parsed 'rules' list to add more metadata on the airspace."
}
},
"required": [
"name",
"type",
"class",
"upperCeiling",
"lowerCeiling",
"activatedByNotam",
"activity"
],
"additionalProperties": false
},
"geometry": {
"type": "object",
"properties": {
"type": {
"type": "string",
"enum": [
"Polygon"
]
},
"coordinates": {
"type": "array",
"items": {
"type": "array",
"items": {
"type": "array",
"items": false,
"prefixItems": [
{
"type": "number",
"minimum": -180,
"maximum": 180
},
{
"type": "number",
"minimum": -90,
"maximum": 90
}
],
"minItems": 2,
"maxItems": 2
},
"minItems": 4
},
"minItems": 1,
"maxItems": 1
}
},
"required": [
"type",
"coordinates"
],
"additionalProperties": false,
"example": {
"type": "Polygon",
"coordinates": [
[
[
9.1234,
45.42432
],
[
10.1234,
45.42432
],
[
10.1234,
47.42432
],
[
9.1234,
45.42432
]
]
]
}
}
},
"required": [
"type",
"properties",
"geometry"
],
"additionalProperties": false
}
]
}
}
},
"required": [
"type",
"features"
],
"additionalProperties": false,
"definitions": {
"verticalLimit": {
"type": "object",
"properties": {
"value": {
"type": "integer"
},
"unit": {
"type": "string",
"enum": [
"FT",
"FL"
]
},
"referenceDatum": {
"type": "string",
"enum": [
"GND",
"STD",
"MSL"
]
}
},
"required": [
"value",
"unit",
"referenceDatum"
],
"description": "Defines an airspace vertical limit. The vertical limit is a combination of an integer value, a measurement unit and a reference datum.",
"additionalProperties": false
}
}
}Install
npm install -g @openaip/yaixm-to-geojsonNode
const { YaixmConverter } = require('@openaip/yaixm-to-geojson');
const inputFilePath = './path/to/input-yaixm-file.txt';
const converter = new YaixmConverter({ fixGeometries: true, strictSchemaValidation: true });
// or alternatively call "convertFromBuffer" to read from Buffer
await converter.convertFromFile(inputFilepath, { type: 'airspace' });
const geojson = converter.toGeojson();CLI
node cli.js -h
Usage: cli [options]
Options:
-f, --input-filepath <inputFilepath> The input file path to the YAIXM file.
-o, --output-filepath <outputFilepath> The output filename of the generated GeoJSON file.
-T, --type The type to read from YAIXM file. Currently only "airspace" is supported. (default: "airspace")
-V, --validate If specified, converter will validate geometries.
-F, --fix-geometry If specified, converter will try to fix geometries.
-S, --strict-schema-validation If specified, converter will strictly validate the created GeoJSON against the underlying schema. If the GeoJSON does not match the JSON schema, the converter will throw an error.
-h, --help Outputs usage information.Simple command line usage:
node cli.js --type=airspace -f ./path/to/input-yaixm-file.txt -o ./path/to/output-geojson-file.geojson