ICARD 5LNC and Operational Data

ICAO GIS analysis

Overview We receive new Waypoint Data from our

client The new Waypoint Data is converted into a

.shp format and integrated in the original data in order to construct updated map with most key layers visualized…

The new ICARD5LNC ICAO database layer is compared with the Operational Data layer

Comparison findings: Many discrepancies between the two data .

ICAO5LNC History? Originally States used ”The Green Book” to choose and reserve a 5LNC. The consequence:

many duplicates between regions and coordinate mistakes recorded in the 5LNC data base .

The calculation of the coordinate location at that time did not follow a geodesic procedure. Regularly the coordinates of a 5LNC were grid intersections on large scale map. The Degrees Minutes and Seconds were read and recorded manually using a divided compass tool…

Result: 5LNC data is inaccurate with varied coordinate precision between 2 and 6 digits. Records are very different to the real world operational coordinate data.

The term Coordinate Precision refers to the mathematical exactness of a coordinate and is based on the possible number of significant digits that can be stored for each coordinate.

Detail: Coordinate precision Difference between 2 and 6 digits

ICARD 5LNC Databasewith precision of 2 digits

Waypoint database with precision of 6 digits

Note: Route intersects Waypoint with coordinate precision of 6

Detail: Duplicate coordinatePoint GAMOT with error of 1NM

ICARD 5LNC database precision of 6

Waypoint database precision of 6

Note: Green Routes intersects waypoint GAMOT with coordinate precision of 6.

Detail: Duplicate Coordinate Precision between points BOSAD and DATAN

ICARD 5LNC database precision of 2

Green Route intersects the waypoint with coordinate precision of 6

ICARD 5LNC database precision of 6

Waypoint database precision 6

Waypoint database Precision of 6

Detail: Coordinate Duplicate Point PAPIX with error of 34 NM

Note: Route intersects waypoint with precision of 6

ICARD 5LNC coordinate precision of 6

Detail: Coordinate Duplicate Point ISALA error of 122 NM

ICARD 5LNC coordinate precision of 6

Note: Route intersects waypoints with precision of 6

Detail: Missing points in ICARD5LNC Missing Waypoint on Upper Route shown in RED

Green Routes intersect waypoints with precision of 6

ICARD 5LNC waypoints withprecision of 6

Upper Routewaypoints with precision of 6

Detail: Missing points in ICARD5LNC Missing Waypoints on Upper Routes shown in RED

Green Routes intersect waypoints with precision of 6

ICARD 5LNC waypoints withprecision of 6

Upper Route waypoints with precision of 6

Detail: Missing points in ICARD5LNC Missing Lower Route waypoints shown in BLUE

Green Routes intersect waypoints with precision of 6

ICARD 5LNC precision of 6

Lower Route waypoints with precision of 6

Detail: Missing points in ICARD5LNC Missing waypoints of Upper and Lower Routes shown in RED, BLUE and GREEN

Green Routes intersect waypoints with precision of 6

ICARD 5LNC waypoints

Upper Route waypoints

Lower Route waypoints

Type in your Browser: http://192.206.28.81/ICARD5LNC Zoom to an area on map, example, Senegal

(Dakar) Locate Table of contents on left side of screen Click on the group layer : DataBase AIP

comparison Click on the 5LNC missing layer Click on the ICARD-WAYPT-DIST layer Zoom in random to different points …

Detail: To access the ICARD5LNC analysis on the ICAO GIS server:

Detail: ICARD -WAYPT-DIST layer

Brown lines shown reflect the distancesmeasured between the ICARD5LNC and Operational data waypoints

Brown lines shown reflect the distancesmeasured between the ICARD5LNC and Operational data waypoints

Detail: zoom of

ICARD –WAYPT-DIST layer

Detail: 5LNC missing UPP layer

Detail: 5LNC missing Lower layer

Detail: ICAO to do list ICARD5LNC prototype Version 2.0 GIS analysis

• List all the ICARD5LNC IN THE DUP that do not intersect true operational routes and list others that require corrections

• List ICARD5LNC waypoints with incorrect coordinate

precision when compared with the operational waypoint data

• List all the ICARD5LNC with the incorrect coordinates when compared to the operational waypoints data, the outcome is a new kind of recorded duplicate.

• List missing waypoints in upper and lower route data with non pronounceable 5 letter radio approach to be incorporated in the ICARD5LNC ICAO using the GIS SPACIAL ANALYSTE software.

Detail: ICAO to do list remarks ICARD5LNC prototype Version 2.0 GIS analysis

• List all the ICARD5LNC IN THE DUP that do not intersect true operational routes and list others that require corrections

(List to be divided by region or state?)• List ICARD5LNC waypoints with incorrect coordinate

precision when compared with the operational waypoint data (List to be divided by region or state?)• List all the ICARD5LNC with incorrect coordinates when

compared to the operational waypoints data, the outcome is a new kind of recorded duplicate.

(List to be divided by region or state?)• List missing waypoints in upper and lower route data with

non pronounceable 5 letter radio approach to be incorporated in the ICARD5LNC ICAO using the GIS Spacial Analyst software. (List to be divided by region or state?)

Questions and Comments To create an effective ICARD INITIALISATION

• We must correct the present ICARD5LNC DATABASE following measures proposed in the “ICAO to do list” Compare complete ICARD5LNC data with respect to the existing operational data and considering coordinate precision, duplicates and other found errors.• Verify ICARD5LNC waypoints that intersect

operational route data• Create a list of omitted waypoints along upper and lower

routes with non pronounceable 5 letter radio approach to be incorporated in the ICARD5LNC ICAO using the GIS Spatial Analyst software.

Questions

Created by SAST Gilbert LasnierGis Officer

To create an effective ICARD INITIALISATION• • WHO should take the decision to correct the present

ICARD5LNC DATABASE ?

ICAO HQ

Many thanks to Jerome Guevin Jean Michel Galais

And Nikki Goldschmid