Talk:NATCND

jens 17:19, 15 November 2008 (CET)

DATSTA, DATEND

Both are critical, they are not needed.

PEREND, PERSTA

Thinking PEREND and PERSTA are useful e.g. for ice information if forecast or actual observations are available

SCAMIN, SCAMAX

Based on David’s proposal sent Sep 29 the use of SCAMIN and SCAMAX should be taken into consideration for providing scale dependent information

DavidAcland 17:17, 25 November 2008 (CET)

Added definitions. Seen magnetic observation. I have split this into two: "magnetic variation" and "magnetic anomaly". However both can already be encoded in ENCs. I would make a stronger case for magnetic anomaly being retained in the NPUBS register although I am not at all convinced that either make a useful contribution to navigation in the Hydro register. I think that weather risk can go because I think we have got it covered by wearsk.

DavidAcland 16:45, 28 November 2008 (CET)

Done a bit more on what was catobs. Changed this to category of time domain, cattim, because some of this is not really "observation". I have also had a fiddle with the definition to make it into "an area in which natural conditions are described".

I have also bracketed the phrase about scale because I do not see scale mentioned in the definition of all of the Hydro items to which SCAMAX and SCAMIN are applied. However I aggree that they should be there. For instance Ocean Passages for the World provides natural conditions at the Oceanic scale, and we issue data at three different scales below that. Likewise with forecast, I think we can agree that we have 3 or more scales: Ocean, offshore, coastal, inshore, Port or local.

jens 08:34, 1 December 2008 (CET)

I think we should also delete the term "during a specified time domain". That makes the time domain entry mandatory; difficult if not having such information.

David, you might have no idea what translations the dictionary to "fiddle" offers! But I got it. The first part of the definition has been fiddled well. The only problem I see is that "An area in which natural conditions are described" describes only the current situation, as been said when using cattim ID3. I think we are talking about weather forecast/report than. But we should need a definition which enables us to say that natcnd describes natural conditions which a mariner might expect. Perhaps something like this "An area in which, based on a specified time domain, natural conditions are described" ((thinking the grammar looks a bit special))

I do have problems with your arguments about scales. The first thing is that SCAMIN/MAX do not offer verbal descriptions. Both are designed for making ECDIS machines able to display or delete objects from screen when passing one of the scales. The description of the scales "Ocean, offshore, coastal, inshore, Port or local" should be the covered area of the object.