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 Worldwide Airport Data

Back to World Airport Data    

Basic Specification, Airport Criteria and Info

Written by Jamie Al-Nasir

Introduction


The following document outlines the specifications of the World Airport Data section, which is part of the PakAviation.com library.

This data is based on a De-classified product of the US Military, Defence Mapping Agency. This document provides a small part of the DAFIF specification which is pertinent to PakAviation.com's implementation.

It must be mentioned that DAFIF is an extensive project, and only a few of the many areas have been implemented here.


Definition of Airport

Airport is defined as an area of land that is used or intended to be used for the landing and take-off of aircraft, and includes its buildings and facilities, if any.  The terms "aerodrome" and "airfield" are considered to be synonymous with the term  "airport".


Criteria for Inclusion of Airports

The Digital Aeronautical Flight Information File (DAFIF) source data will, at minimum, contain basic data for all active airports, which have a usable permanent surface runway and are portrayed in the Flight Information Publications (FLIPs).

Note: When an airport meets the above criteria, DAFIF will reflect all Runways on that  airport without regard to length or surface. Additionally, airports NOT having any permanent surface runways may appear from time to time IF they are portrayed in FLIP under the "Special Military Request" (SMR) caveat.


ICAO ID

When an ICAO code is not assigned, the DMA (Defence Mapping Agency) area analyst shall assign the first two letters of the controlling authority of the area in which the  feature is located as an abbreviated ICAO code.


Latitude/Longitude

The geographic coordinate location of the feature based on the local horizontal datum. The Source database can accommodate refinement to the 100th of a second, though not all records feature this degree of refinement.

Local horizontal datum identifies the local datum used as a basis for the geographic coordinates.


Runway end co-ordinates

Runway end coordinates are defined as the point where the center line intersects with the beginning of the surface on the high end of the runway.

This is also the case for the Geodetic attributes.


PCN (Pavement Classification Number)

A Coded number which is the standard ICAO method of reporting pavement strength for pavements with load bearing strength greater than 12,500 pounds.

In PakAviation.com's World Airport Data the PCN number is parsed, and a description of it's value is displayed.


TDZE (Touchdown Zone Elevation)

The highest elevation in the first 3000 feet of the usable landing surface measured in feet and tenths of feet from MSL.  A minus sign (-) preceding the elevation indicates below Mean Sea Level.


Displaced Threshold

The distance in feet from the designated beginning of that end of the runway to the portion of that end of the runway usable for landing.


Displaced Threshold Elevation

The elevation at the point of the displaced threshold on that end of the runway measured in feet and tenths of feet from Mean Sea Level.  A minus sign (-) preceding the elevation indicates below MSL.


Runway end co-ordinates

Runway end coordinates are defined as the point where the center line intersects with the beginning of the surface on the high end of the runway.

This is also the case for the Geodetic attributes.


Runway Lighting Systems

The DAFIF data source can accomodate upto 8 lighting systems for each particular runway. PakAviation's implementation includes the basic names of the lighting systems.


Validity of Data and Publication Cycles

** FOR SIMULATION ONLY - ACCURACY OF DATA NOT GUARANTEED **

The data in this implementation is in most cases accurate, though the data is not always kept up-to date in accordance with the DAFIF specifications. This factor is due to the scope of PakAviation.com's implementation, which primarily provides this information for simulation purposes only.


   Copyright 1998-2005 Jamie Al-Nasir. All Rights Reserved