Aviation API
10 Graphical NZ Significant Weather (GNZSIGWX) GeoJSON
This product provides the forecast information contained in the Graphical New Zealand Significant Weather Chart (GNZSIGWX) in a GeoJSON format, which is GIS compatible. This enables the product to be used by customers as an overlay on a map within a browser, mobile or tablet application.
There is a style document that may be applied to the returned GeoJSON data. The style document can be retrieved from the following URL https://api.metservice.com/aviation/assets/style/json/gnzsigwx-nzzc-style.json.
10.1 Latest for a Flight Level Range
Request the latest GNZSIGWX GeoJSON data for a specific flight level range.
10.1.1 API Call:
GET /aviation/gnzsigwx/{flightlevel}10.1.2 Path Parameter:
| Path Parameter | Example | Description |
|---|---|---|
| flightlevel | fl250 | A supported flight level: fl100, fl250, fl410. This parameter is Mandatory. |
10.1.3 Example:
This example will return the GNZSIGWX GeoJSON data for flight level range SFC-FL250.
GET /aviation/gnzsigwx/fl25010.1.4 API Response:
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"version": "1.0",
"issue-time": "2025-09-15T04:04:43Z",
"path": "/aviation/api/aviation/gnzsigwx/fl250",
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"properties": {
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"featureType": "mountainWaves",
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"upperExtentText": "200"
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"upperExtentText": "XXX"
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"properties": {
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"featureType": "volcano",
"productKey": "GraphicalNZSigwx",
"volcanoName": "WHAKAARI/WHITE ISLAND"
},
"type": "Feature"
}
],
"metadata": {
"alerts": [
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],
"information": [
"Chart valid for NZZC FIR only",
"Heights in FL unless otherwise specified",
"The use of CB implies severe turbulence and icing"
],
"isAmendment": false,
"issueTime": "2025-09-14T19:57:25Z",
"notes": [
"Please refer to GSM for any SIGMET information"
],
"referenceVersion": "2023-05-17",
"validFromTime": "2025-09-14T21:00:00Z",
"validToTime": "2025-09-15T03:00:00Z",
"validUpToFL": 250,
"version": "2022-12-09"
},
"type": "FeatureCollection"
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