Read a data file holding sea level data. BUG: the time vector assumes GMT, regardless of the GMT.offset value.
a connection or a character string giving the name of the file to load. See Details for the types of files that are recognized.
time zone. The default value,
if provided, the action item to be stored in the log. (Typically only provided for internal calls; the default that it provides is better for normal calls by a user.)
an integer specifying whether debugging information is
to be printed during the processing. This is a general parameter that
is used by many
A sealevel object.
This function starts by scanning the first line of the file, from which it
determines whether the file is in one of two known formats: type 1, the
format used at the Hawaii archive centre, and type 2, the
comma-separated-value format used by the Marine Environmental Data Service.
The file type is inferred by examination of its first line. If that contains
Station_Name the file is of type 2. If
the file is in neither of these formats, the user might wish to scan it
directly, and then to use
as.sealevel() to create a
The Hawaii archive site at
http://ilikai.soest.hawaii.edu/uhslc/datai.html at one time provided a graphical
interface for downloading sealevel data in Type 1, with format that was once
http://ilikai.soest.hawaii.edu/rqds/hourly.fmt (although that link
was observed to no longer work, on December 4, 2016).
Examination of data retrieved from what seems to be a replacement Hawaii server
(https://uhslc.soest.hawaii.edu/data/?rq) in September 2019 indicated that the
format had been changed to what is called Type 3 by
Web searches did not uncover documentation on this format, so the
decoding scheme was developed solely through examination of
data files, which means that it might be not be correct.
The MEDS repository (http://www.isdm-gdsi.gc.ca/isdm-gdsi/index-eng.html)
provides Type 2 data.