NAV 44/7/8
Appendix E
3.4.2.14 Depth and height units;
3.4.2.15 Pixel resolution of the image file
as measured in pixels-per-millimeter or pixels-per-inch:
3.4.2.16 A mechanism, such as parameters
and an algorithm, to allow geographical positions to be
converted to RNC (pixel) coordinates and vice-versa;
3.4.2.17 Chart limits;
3.4.2.18 Colour palettes for daytime.
nighttime, dusk and twilight.
3.4.2.18.1 Colours used for daytime viewing
should be those used on the paper versions of the same
charts.
3.4.2.18.2 Colours for dusk. dawn and
nighttime should follow as closely as practicable the Colours
and Symbols Standards specified in IHO Special Publication
S-52, Appendix 2 as interpreted by the national hydrographic
office originating the RNC;
3.4.2.19 Sufficient information which will
allow each note, diagram, item of marginalia ar other chart
subarea of special interest to be found and displayed
clearly, simply and quickly even though that subarea may not
be located on the portion of the chart currently being
displayed;
3.5 Updates
3.5.1 The following meta data should be
included for each RNC update. Where an RNC linage file
contains more than one discrete chart image, e.g. chart
Insets, in addition to the main panel of the chart, the meta
data should be sufficient to Identify to which the update
applies.
3.5.1.1 Producing agency identifier
specified using the producing agency codes listed in Annex A
to Appendix A of the IHO publication S-57;
3.5.1.2 Update number:
3.5.1.3 Update date;
3.5.1.4 RNC to which the update applies;
3.5.1.5 Chart edition date to which the
update applies;
3.5.1.6 Any changes to the meta data of the
RNC being updated (e.g, if a chart note changes, the relevant
changes in RNC meta data need to be included in the update);
3.5.1.7 Sufficient information to allow the
update to be applied automatically to the RNC and for the
update to be displayed.
I:/NAV44/7-8.WPD
