ELECTRONIC TERRAIN AND OBSTACLE DATA (e-TOD)

Electronic Terrain and Obstacle Data (eTOD) is the digital representation of terrain and obstacles provided as datasets satisfying user requirements for a series of airborne and ground application such as  Procedure Design etc.

A BIT ABOUT NOTAM

NOTAM, "NOtice To AirMen", are notices containing essential flight operation information not known sufficiently in advance to publicize by other means. Just like weather reports, they include endless abbrieviated text (known as a contraction) which are sometimes difficult to figure out. 

Example:

Types of NOTAM's include the following: 

•          NOTAM(D): Information that requires wide dissemination and pertains to enroute navigational aids, civil public use landing areas listed in the Airports Facility Directory and aeronautical data related to IFR operations. 
•          NOTAM(L): Information that requires local dissemination, but does not qualify as NOTAM(D) information. This includes, but is not limited to, aircraft jettisoning fuel, bird activity, moored balloons, military training activity, etc.This type of NOTAM no longer exists, now part of "D" NOTAMs and distributed nationwide.
•          FDC: Information that is regulatory in nature pertaining to flight including, but not limited to, changes to charts, procedures, and airspace usage. It includes TFRs

·       Types of "D" NOTAMs

Keyword	Example	Meaning
RWY	RWY 3/21 CLSD	Runways 3 and 21 are closed to aircraft.
TWY	TWY F LGTS OTS	Taxiway F lights are out of service.
RAMP	RAMP TERMINAL EAST SIDE CONSTRUCTION	The ramp in front of the east side of the terminal has ongoing construction.
APRON	APRON SW TWY C NEAR HANGARS CLSD	The apron near the southwest taxiway C in front of the hangars is closed.
AD	AD ABN OTS	Aerodromes: The airport beacon is out of service.
OBST	OBST TOWER 283 (246 AGL) 2.2 S LGTS OTS (ASR 1065881) TIL 0707272300	Obstruction: The lights are out of service on a tower that is 283 feet above mean sea level (MSL) or 246 feet above ground level (AGL) 2.2 statute miles south of the field. The FCC antenna structure registration (ASR) number is 1065881. The lights will be returned to service 2300 UTC (Coordinated Universal Time) on July 27, 2007.
NAV	NAV VOR OTS	Navigation: The VOR located on this airport is out of service.
COM	COM ATIS OTS	Communications: The Automatic Terminal Information      Service (ATIS) is out of service.
SVC	SVC TWR 1215-0330 MON-FRI/1430-2300 SAT/1600-0100 SUN TIL 0707300100	Service: The control tower has new operating hours, 1215-0330 UTC Monday Thru Friday, 1430-2300 UTC on Saturday, and 1600-0100 UTC on Sunday until 0100 UTC on July 30, 2007.
	SVC FUEL UNAVBL TIL                               0707291600	Service: All fuel for this airport is unavailable                                                                                      until July  29, 2007 at 1600 UTC.
	SVC CUSTOMS UNAVBL                                                                                         TIL 0708150800	Service: United States Customs service for this                                                                                                  airport   will not be available until August 15, 2007                                                                                         at 0800  UTC.
AIRSPACE	AIRSPACE AIRSHOW ACFT 5000/BLW 5 NMR AIRPORT AVOIDANCE ADZD WEF 0707152000-0707152200	Airspace. There is an airshow being held at this airport with aircraft flying 5000 feet and below within a 5 nautical mile radius. Avoidance is advised from 2000 UTC on July 15, 2007 until 2200 UTC on July 15, 2007.

Further codes please