write.rwl {dplR} | R Documentation |
This function writes a chronology to a Tucson (decadal) format file.
write.rwl(rwl.df, fname, header=NULL, append=FALSE, prec=0.01)
rwl.df |
a data.frame containing tree-ring ring widths with the
series in columns and the years as rows. The series ids are the column names
and the years are the row names. This type of data.frame is
produced by read.rwl . |
fname |
a character vector giving the file name of the rwl file. |
header |
a list giving information for the header of the file. If NULL then no header information will be written. |
append |
logical flag indicating whether to append this chronology to an existing file. |
prec |
numeric indicating the precision of the output file. -
This must be equal to either 0.01 or 0.001 (units are in mm). |
This writes a standard rwl file as defined according to the standards of
the ITRDB at http://www.ncdc.noaa.gov/paleo/treeinfo.html. This is the
decadal or Tucson format. It is an ASCII file and machine readable by the
standard dendrochronology programs. Header information for the chronology can
be written according to the International Tree Ring Data Bank (ITRDB)
standard. The header information is given as a list
and must be
formatted with the following:
Description | Name | Class | Max Width |
Site ID | site.id | character | 5 |
Site Name | site.name | character | 52 |
Species Code | spp.code | character | 4 |
State or Country | state.country | character | 13 |
Species | spp | character | 18 |
Elevation | elev | character or numeric | 5 |
Latitude | lat | character or numeric | 5 |
Longitude | long | character or numeric | 5 |
First Year | first.yr | character or numeric | 4 |
Last Year | last.yr | character or numeric | 4 |
Lead Investigator | lead.invs | character | 63 |
Completion Date | comp.date | character | 8 |
See examples for a correctly formatted header list. If the width of the fields is less than the max width, then the fields will be padded to the right length when written. Not that lat and long are really lat*100 or long*100 and given as integers. E.g., 37 degrees 30 minutes would be given as 3750.
Series can be appended to the bottom of an existing file with a second
call to write.rwl
. The output from this file is suitable for
publication on the ITRDB.
None. Invoked for side effect (file is written).
Andy Bunn
data(co021) co021.hdr <- list(site.id = "CO021", site.name = "SCHULMAN OLD TREE NO. 1, MESA VERDE", spp.code = "PSME", state.country = "COLORADO", spp = "DOUGLAS FIR", elev = 2103, lat = 3712, long = -10830, first.yr = 1400, last.yr = 1963, lead.invs = "E. SCHULMAN", comp.date = "") write.rwl(rwl.df = co021, fname = 'tmp.rwl', header=co021.hdr, append=FALSE,prec=0.001)