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4.3.1 (684).
4.3.3 The identified features shall be referenced to defined geodetic coordinates (685). In addition, the procedure shall state the geodetic system used to define these geographical locations (686).
4.3.4 Recommendation: The procedure should define the conversion of the geographical co-ordinates to the system geometry. It should also state the algorithms or processes used to convert this data (687).
4.3.5 Recommendation: A suitably qualified engineer should carry out Steps 4.3.3. and
4.3.4 (688).
4.4 Verification
4.4.1 Provisions shall be made to check the displayed data for accuracy and completeness (689).
4.4.2 The original production or change request shall be compared with the resulting map information (690).
4.4.3 Recommendation: This should include a procedure for checking the absolute accuracy of the displayed maps (691).
4.4.4 Recommendation: A member of the ATC Department should carry out the verification (692).
4.5 Validation
4.5.1 The final user shall evaluate the whole map prior to introduction to service (693).
4.5.2 Recommendation: A member of the ATC Department should carry out the validation (694).
4.6 A procedure shall exist to ensure that the map always contains all operationally significant information (695).
5 Responsibilities for Control of Video Maps
The video map documentation shall identify all posts responsible for the control of the video maps (696).
6 Tolerances on Video Map features
6.1 For a display used for SRA, all features used in the SRA zone shall be accurate to within 5% of range scale +55 metres (180 feet) in range and within 1 degree measured from the airfield reference point (697).
6.1.1 Recommendation: For raster scan display systems, all features should be accurate to within the resolution of the display (698).
6.2 For all other features accuracy shall be within 450 metres (0.25 NM) (699).
7 Evaluation of Video Maps
7.1 New Video Maps
7.1.1 At least three features of new video maps shall have the accuracy assessed as part of the flight trial for the equipment. (700) The tolerance on this accuracy shall be better than 900 metres (0.5 NM) (701).
7.1.2 Recommendation: These features should, wherever possible, be in three quadrants of the display (702).
NOTE: A new video map has no predecessor. Sites which have new radar or map generation equipment produce new maps.
7.1.3 Recommendation: The accuracy assessment should ensure that the features shown correspond identically to those displayed at adjacent ATC units (703).
NOTE: Co-ordination between adjacent units is an important ATC function.
7.1.4 Recommendation: Coordination should be evaluated whenever opportunity occurs (704).
7.2 New Surveillance Radar Approach (SRA) Maps
7.2.1 New SRA maps shall be assessed for bearing and range error at 6 NM, 3 NM, 2 NM, 1 NM and 0.5 NM as appropriate to the intended SRA termination range (705). The assessment shall be by use of an aircraft with independent positioning equipment on board an aircraft or fixed ground mounted reflection sources (706).
7.2.2 Recommendation: Internal or external positioning equipment may be used to determine aircraft position, for example, theodolite or INS etc (707).
7.3 Updated Video Maps or SRA Maps
Recommendation: Methods independent of the original source should be used for proof of changes which are independent of the original source (708).
8 Consideration on Mapping Co-ordinate System
NOTE: When producing video maps the aim is to place the feature at the position where the radar sensor would place a co-located target. However, as the radar calculates by range and angle, this will not account for the change in angle between grid north and magnetic north. In addition all systems use published geographical co-ordinates to derive the feature position in range angle. Use of a different system to convert the geographical co-ordinates from that used to derive the original geographical co-ordinates, will produce an error. The procedures in Sections 4, 6 and 7 will evaluate these errors.
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CAP 670 Air Traffic Services Safety Requirements 2(95)
