GeoJSON Service Help

SIGMETs

Location: /gis/scripts/SigmetJSON.php

This script will create GeoJSON output using data from the ADDS database. The latest set of US SIGMETs are returned. Here is sample output:

{ "type": "FeatureCollection",
    "features": [
    { "type": "Feature",
	"properties": {
	    "icaoId": "KKCI",
	    "airSigmetType": "SIGMET",
	    "hazard": "CONVECTIVE",
	    "validTimeFrom": "2013-10-25T21:55:00Z",
	    "validTimeTo": "2013-10-25T22:54:59Z",
	    "severity": "2",
	    "altitudeHi1": 35000,
	    "altitudeHi2": 35000,
	    "rawAirSigmet": "WSUS33 KKCI 252155 \nSIGW  \nCONVECTIVE SIGMET 25W \n
		VALID UNTIL 2355Z \nCO NM AZ UT \nFROM 20N DVC-30W ALS-40E RSK-70WSW
		RSK-20N DVC \nAREA TS MOV FROM 31010KT. TOPS TO FL350. \n \n"
	},
	"geometry": {
	    "type": "Polygon",
	    "coordinates": [
		[[-108.93,38.14],[-106.45,37.35],[-107.27,36.75],[-109.44,36.30],
	    [-108.93,38.14] ] ]
	}
    },

The properties output from the script are:

  • icaoId - ICAO ID that entered the SIGMET
  • airSigmetType - SIGMET
  • hazard - CONVECTIVE, TURB, ICING, IFR, MTN OBSCN, ASH
  • validTimeFrom - ISO 8601 formatted date and time when SIGMET is first valid
  • validTimeTo - ISO 8601 formatted date and time when SIGMET ends
  • severity - integer severity value (typically 1 or 2)
  • altitudeLow1 - Lowest level SIGMET is valid in feet
  • altitudeLow2 - Secondary lowest level SIGMET is valid in feet
  • altitudeHi1 - Highest level SIGMET is valid in feet
  • altitudeHi2 - Secondary highest level SIGMET is valid in feet
  • rawAirSigmet - Raw SIGMET text

The script can be passed parameters via command line or through CGI REQUEST. The parameters to the script include:

  • top=### - Specifies top altitude in 100s feet for returned SIGMETs. The default is no top.
  • bottom=### - Specifies bottom altitude in 100s feet for returned SIGMETs. The default is no top.
  • date=yyyymmddhhnn - This sets the date for the SIGMETs reports. This combined with the age returns all reports within that time range. The default is current time.
  • jsonp=callback - This sets the callback function to be used in a JSONP call. This is just when the script is called on another server. The default is null which outputs straight JSON.

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