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Aviation API

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11 Graphical Aviation Forecast (GRAFOR) Charts

The Graphical Aviation Forecast Chart (GRAFOR) is a forecast issued for the NZZC FIR. The chart issued provides a forecast for various flight conditions from SFC to FL100 and grouped by regions affected. They are issued 2 times a day, valid at 00, 06, 12, and 18 (UTC).

11.1 Latest GRAFOR Set

Request the latest GRAFOR chart set.

11.1.1 API Call:

GET /aviation/chart/grafor/latest

11.1.2 Example:

This example will return links to the latest set of charts.

GET /aviation/chart/grafor/latest

11.1.3 API Response:

{
    "version": "1.0",
    "issue-time": "2025-09-08T21:50:03Z",
    "path": "/aviation/api/aviation/chart/grafor/latest",
    "response": [
        {
            "met:locator": "https://api.metservice.com/aviation/assets/grafor/20250908/090000_082057.png",
            "met:product-name": "grafor",
            "met:domain": "aviation",
            "met:issue-time": "2025-09-08T20:57:00Z",
            "met:valid-at": "2025-09-09T00:00:00Z",
            "met:validity": "00"
        },
        {
            "met:locator": "https://api.metservice.com/aviation/assets/grafor/20250908/090600_082100.png",
            "met:product-name": "grafor",
            "met:domain": "aviation",
            "met:issue-time": "2025-09-08T21:00:00Z",
            "met:valid-at": "2025-09-09T06:00:00Z",
            "met:validity": "06"
        },
        {
            "met:locator": "https://api.metservice.com/aviation/assets/grafor/20250908/091200_082104.png",
            "met:product-name": "grafor",
            "met:domain": "aviation",
            "met:issue-time": "2025-09-08T21:04:00Z",
            "met:valid-at": "2025-09-09T12:00:00Z",
            "met:validity": "12"
        }
    ]
}

11.2 Latest for a Validity

Request the latest GRAFOR chart for a specific validity.

11.2.1 API Call:

GET /aviation/chart/grafor/{validity}

11.2.2 Path Parameter:

Path ParameterExampleDescription
validity06A supported valid at time: 00, 06, 12, 18.

This path parameter is Mandatory.

11.2.3 Example:

This example will return a link to the latest grafor chart for validity 06Z.

GET /aviation/chart/grafor/06

11.2.4 API Response:

{
    "version": "1.0",
    "issue-time": "2025-09-08T21:50:49Z",
    "path": "/aviation/api/aviation/chart/grafor/06",
    "response": [
        {
            "met:locator": "https://api.metservice.com/aviation/assets/grafor/20250908/090600_082100.png",
            "met:product-name": "grafor",
            "met:domain": "aviation",
            "met:issue-time": "2025-09-08T21:00:00Z",
            "met:valid-at": "2025-09-09T06:00:00Z",
            "met:validity": "06"
        }
    ]
}

11.3 Valid GRAFOR charts for the next n hours

Request the GRAFOR charts that will be valid in the next n hours.

11.3.1 API Call:

GET /aviation/chart/grafor/next/{n}/hours

11.3.2 Path Parameter:

Path ParameterExampleDescription
n06The number of hours into the future that the valid at time of the chart should fall within.

This can be up to 24 hours.

This path parameter is Mandatory.

11.3.3 Example:

This example will return links to the charts that are valid in the next 12 hours.

GET /aviation/chart/grafor/next/12/hours

11.3.4 API Response:

{
    "version": "1.0",
    "issue-time": "2025-09-08T21:52:04Z",
    "path": "/aviation/api/aviation/chart/grafor/next/12/hours",
    "response": [
        {
            "met:locator": "https://api.metservice.com/aviation/assets/grafor/20250908/090000_081105.png",
            "met:product-name": "grafor",
            "met:domain": "aviation",
            "met:issue-time": "2025-09-08T11:05:00Z",
            "met:valid-at": "2025-09-09T00:00:00Z",
            "met:validity": "00"
        },
        {
            "met:locator": "https://api.metservice.com/aviation/assets/grafor/20250908/090000_081242.png",
            "met:product-name": "grafor",
            "met:domain": "aviation",
            "met:issue-time": "2025-09-08T12:42:00Z",
            "met:valid-at": "2025-09-09T00:00:00Z",
            "met:validity": "00"
        },
        {
            "met:locator": "https://api.metservice.com/aviation/assets/grafor/20250908/090000_082057.png",
            "met:product-name": "grafor",
            "met:domain": "aviation",
            "met:issue-time": "2025-09-08T20:57:00Z",
            "met:valid-at": "2025-09-09T00:00:00Z",
            "met:validity": "00"
        },
        {
            "met:locator": "https://api.metservice.com/aviation/assets/grafor/20250908/090600_081107.png",
            "met:product-name": "grafor",
            "met:domain": "aviation",
            "met:issue-time": "2025-09-08T11:07:00Z",
            "met:valid-at": "2025-09-09T06:00:00Z",
            "met:validity": "06"
        },
        {
            "met:locator": "https://api.metservice.com/aviation/assets/grafor/20250908/090600_082100.png",
            "met:product-name": "grafor",
            "met:domain": "aviation",
            "met:issue-time": "2025-09-08T21:00:00Z",
            "met:valid-at": "2025-09-09T06:00:00Z",
            "met:validity": "06"
        }
    ]
}

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