[CF-metadata] MSG CPP standard name for time_offset_of_observation / pixel_delta_time

From: Jonathan Gregory <j.m.gregory>
Date: Mon, 31 Jan 2011 13:44:12 +0000

PS to my last posting.

An alternative to using a time offset would be to store the pixel time as an
absolute time as well e.g.

> float obs(scan,pixel); // data variable
> coordinates="pixeltime";
> double scan(scan); // time of scan start
> scan:units="seconds since 2011-1-31";
> scan:standard_name="time";
> double pixeltime(scan,pixel);
> pixeltime:units="seconds since 2011-1-31";
> pixeltime:standard_name="time";

This means each observation has two times: one for the start of its scan, and
one for its pixel. You can obviously compute offsets by subtracting the scan-
start time from the pixel-time. It depends on which you need more often,
I suppose.

Jonathan
Received on Mon Jan 31 2011 - 06:44:12 GMT