FORMAT FOR TREE RING DATA FILES


RAW DATA FILES  (File Extension .RWL)

These are measurements in units of .01mm of the thickness of tree ring
width for each year.  Each file consists of all the measurements for a
given site.  As many as 50 Core ID numbers and 50 data series may
comprise one (site) file.  Missing value code is 999 or blanks.  The
10 values following the decade are the 10 annual measurements for the
10 years of that decade. The format is:

Core ID Number        Decade      Data Values      Site ID Number
(file contains many)

column 1-6             9-12        10(I6),           column 74-78
                                   column 13-72


Processed Data Files (Site Chronologies, File Extension .CRN)

These are the normalized averages from a stand of trees, representing
percentage of mean growth observed for each year over the entire
stand.  Site Chronologies are used in climate analysis, and it is
these values which are displayed by the ITRDB software.  Data are
stored as 4-digit numbers, with a value of 1000 representing mean
growth and 900 representing 90% of mean growth, etc.  There is only
one time series per file, in contrast to the raw data files.  Missing
value code is 9990. Site information is stored in the first 3 records
of the file.

Format for chronology header records:

Record #1: 1-6 Site ID, 10-61 Site Name, 62-65 Species Code, optional ID#'s

Record #2: 1-6 Site ID, 10-22 State or Country, 23-30 Species,
           41-45 Elevation, 48-57 Lat-Long, 68-76 1st & last Year

Record #3: 1-6 Site ID, 10-72 Lead Investigator, 73-80 comp. date



Chronology Data, Records 4-??

Site ID#       Decade     Annual Value      # of samples   TRL ID#(optional)
 
 column 1-6     7-10      column 11-14      column 15-17     col.82-88

                              .               .
                              .               .
                           column 74-77     column 78-80
                          (repeated 10x)   (repeated 10x)


Chronology Statistics, Last Record, Optional:

Site ID#       Number of Years   First Order Autocorrelation    Standard Deviation   
column 1-6     column 8-10       column 13-16                   column 19-22     
continued:
Mean Sensitivity Mean Index Value Sum of Indices Sum of Squares of Indices Max# of series   
column 25-28     column 29-35     column 37-44   column 46-53              column 62-63