International hydrographic organization specifications for chart content and display aspects of ecdis

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S-52 Appendix 2 - IHO
S-52 Appendix 2 - IHO
heading deltaCthreshold=8.0 delta C threshold for flagging errors deltaEthreshold=10.0 delta E threshold for flagging errors luminancethreshold=0.2 luminance threshold (fraction) for flagging luminance errors

S, Edition 6.0 March 2010 78

Sample Output Data
Note in these examples that both the "out of spec" colour and "cant be distinguished" colours
are both within specified tolerances and are used as examples to show the format of the output
data. In the case of "out of spec colours, the value of dC must be greater than 8.0 to constitute
an improper colour, and for "colours that can't be distinguished, dE is to be less than 10 for the
colours to be too close in value. Table DAY_BRIGHT Out of spec colours
(list of colours that fall outside of tolerance for original colour specification , in following format:) Meas 0.2797;0.3092;44.9668 Orig 0.2800;0.3100;45.0000 RES grey dC: 0.5004 Colours that cannot be distinguished
(list of colours that cannot be distinguished from other colours.)
NODTA: 0.2797;0.3092;44.9668 CHGRD: 0.2807;0.3112;24.8055 dE: 18.1919

S, Edition 6.0 March 2010 79

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