I have metadata for SST image for the year 1997 and i would like to know start time(procuring time of the satellite) of the image ,its in the format
Name:dsp_StartTime
Value:60130.14
Type:float
what does this mean?
If you get details of the HDF file, this is a 32-bit floating point data. In the same file you can get the start date as YYYY/MM/DD.
MATLAB has a provision to read the HDF5 file. Alternately you can refer "www.hdfgroup.org" for a more detailed description of the data attributes.
Another important point to note here is you can also refer the time stamp used in UNIX like systems. Here, the Timestamp represents the number of seconds elapsed since the date of starting the system or some other reference date.
Take an example - You have system start data as 1990/01/01 (1st Jan. 1990) and time is 00:00:00.0 in HH:MM:SS.0 fashion. Now further the time stamp is say 60130.14 (I have taken the same number from your data, but it can be different also!)
Now you can convert this number into minutes and hours and then add it to the original date and you will get this as the date and time in human readable fashion as YYYY/MM/DD HH:MM:SS.0
1) 1990/01/01 00:00:00.0 the start date specified
2) Timestamp of 60130.14 is converted to hours and minutes like -
(60130.14)/60/60/24 to get minutes, hours etc.
3) Add this in the original date -
4) The new time is 1990/01/01 16:42:10.1 or for that matter 4:42:10 PM
I tried to explain this in simple way. Hope you can verify it to suit your data.
Best Luck!
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