of the NHP file name
The NHP file name in general is as follows:
where ## and
xxx are integers for latitude and longitude in degrees respectively; Yr
is last 2 digits, such as '99' = Year 1999 and '00' = Year 2000
etc.; Day is Julian Date, day of the year in 001 to 366;
the nhp suffix indicates it is the NOAA Hydrophone
first part of the file name H##[N/S]xxx[E/W] shows the general location
of the Hydrophone. The "N" or "S" and "E" or "W" will be used to
indicate the hemispheres of latitude and longitude. Yr and Day indicate
the Date of the data.
time range of data is indicated by a letter "A" to "Z" after YrDay.
When the letter "Z" is shown, the NHP file is a 1-Day file from time
00:00:00 to 23:59:59. NHP files with the letters "A" to "Y" are
not whole day files. For NHP files with the letter "A", the data
are from the beginning of the date, 00:00:00, to some time before the
NHP file with the letter "B" (if
it exists) of the same Year and Day. For NHP files with the letter "Y",
the data are from some time after the end time of the NHP file with the
"X" (if it exists) of the same Year and Day to the end of the day, 23:59:59.
For other NHP files with the letters "B" to "X" of the same Year
and Day, their times are in between the end time of file with "A" and
the start time of the file with "Y". An example of the nomenclature of
NHP files is:
H*YrDayA.nhp < H*YrDayB.nhp < ... < H*YrDayX.nhp < H*YrDayY.nhp
to t1 | B-t1 to t2 | X-tn-1 to tn | Y-tn to 23:59:59
to tn are times in between 00:00:00 and 23:59:59.
from 00:00:00 to 23:59:59.
most cases, only NHP files with "Z", "A" and "Y" will be found and a few
files with "B" also exist. When NHP files with the letters "A" and "Y" of
the same day and year are used, there is a time (data) gap during
Examples of the NHP File Names
H16N049W99362Z.nhp is a 1-Day file of Year 1999 Julian Date 362 at the general
location of 16oN and 49oW.
H16N049W00057A.nhp and H16N049W00057Y.nhp show two data files of the same day
with a time gap after time 00:00:00 and before 23:59:59.
H08S110W02111Z.nhp another 1-Day file of Year 2002 Julian Date: 111 from a
Select NHP Data Files
The following links point
to the ftp sites that contain the NHP data files. Choose a location of interest
and select a NHP data file to down load. Note that since the Year is represented
by 2 digits, e.g. "99" for 1999 and 00 for 2000, NHP
data files for 1999 may be shown at the bottom of screen.