GeoJSON Service Help

SIGMETs

Location: /gis/scripts/IsigmetJSON.php

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

{ "type": "FeatureCollection",
    "features": [
    { "type": "Feature",
	"properties": {
	    "icaoId": "FAOR",
	    "firId": "FAOR",
	    "firName": "FACA CAPE TOWN",
	    "hazard": "TS",
	    "validTimeFrom": "2013-11-19T17:02:00Z",
	    "validTimeTo": "2013-11-19T21:00:00Z",
	    "qualifier": "EMBD",
	    "geom": "AREA",
	    "coords": "-31.82,26.80,-32.23,27.55,-33.38,28.32,-34.18,27.95,
	    -35.42,26.22,-35.50,25.25,-34.95,23.45,-34.95,23.45,-34.55,22.25,
	    -33.38,22.43,-32.55,22.67,-32.55,22.73,-32.53,25.12",
	    "rawSigmet": "FAOR SIGMET A01 VALID 191702/192100 FAOR-\n
	    FACA CAPE TOWN FIR EMBD TS OBS WI\n
	    S3149 E02648 - S3214 E02733 - S3323 E02819 - S3411 E02757 -\n
	    S3525 E02613 - S3530 E02515 - S3457 E02327 - S3457 E02327 -\n
	    S3433 E02215 - S3323 E02226 - S3233 E02240 - S3233 E02244 -\n
	    S3232 E02507 TOP FL400="
	},
	"geometry": {
	    "type": "Polygon",
	    "coordinates": [
		[[26.80,-31.82],[27.55,-32.23],[28.32,-33.38],[27.95,-34.18],
	    [26.22,-35.42],[25.25,-35.50],[23.45,-34.95],[23.45,-34.95],
	    [22.25,-34.55],[22.43,-33.38],[22.67,-32.55],[22.73,-32.55],
	    [25.12,-32.53],[26.80,-31.82] ]
		]
	}
    },
    { "type": "Feature",
	"properties": {
...

The properties output from the script are:

  • icaoId - ICAO ID that entered the SIGMET
  • firId - Flight Information Region Identifier
  • firName - Long name for the FIR
  • hazard - TS, TSGR (thunderstorms with hail), TURB, LLWS (low level wind shear), MTW (mountain wave), ICING, TC (tropical cyclone), SS (sand storm), DS (dust storm), VA (volcanic ash), RDOACT CLD (radioactive cloud)
  • validTimeFrom - ISO 8601 formatted date and time when SIGMET is first valid
  • validTimeTo - ISO 8601 formatted date and time when SIGMET ends
  • qualifier - hazard qualifier such as ISOL (isolated), SEV (severe), EMBD (embedded), etc
  • geom - Geometry of region (UNK if unable to decode from SIGMET).
  • coords - Coordinates for the geometry. This might be enough information to establish a region such as "N OF N3200".
  • base - Lowest level SIGMET is valid in feet
  • top - Lowest level SIGMET is valid in feet
  • rawSigmet - Raw SIGMET text

If the decoder cannot determine a region, the "geom" parameter will specify "UNK" and the geometry output will be an outline for the FIR.

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

  • type=type - Specifies type of SIGMET to parse. See list of hazards above.
  • 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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