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Tucson format - Cybis Wiki

Tucson format

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(Basics of the Tucson format for ring width data)
(Basics of the Tucson format for ring width data)
Line 14: Line 14:
 
I.e. the stop marker is used to show not only the end of the series but also the units of measurement used (0.01 mm or 0.001 mm)!
 
I.e. the stop marker is used to show not only the end of the series but also the units of measurement used (0.01 mm or 0.001 mm)!
  
The missing data mark is actually not defined, though usually the mark "-999" is used.
+
The missing data mark is actually not defined, though usually the mark "-999" is used within 0.01 mm files, and "0" in 0.001 mm files.
  
 
<br/>Note 1: The consequence of using the value 999 as a stop marker is that a measurement of 9.99 mm, in 0.01 mm units, has to be changed
 
<br/>Note 1: The consequence of using the value 999 as a stop marker is that a measurement of 9.99 mm, in 0.01 mm units, has to be changed
 
into 9.98 mm (written value=998) or 10.00 mm (1000)! To avoid fooling any other software, it is probably best never to write the value "999" as measurement data also for files with 0.001 mm units!
 
into 9.98 mm (written value=998) or 10.00 mm (1000)! To avoid fooling any other software, it is probably best never to write the value "999" as measurement data also for files with 0.001 mm units!
 
<br/>Note 2: If 5 digits are needed for the year number, i.e. a core older than -999, the identity cannot be more than 7 alphanumeric characters.
 
<br/>Note 2: If 5 digits are needed for the year number, i.e. a core older than -999, the identity cannot be more than 7 alphanumeric characters.
 
+
<br/>Note 3: An ITRDB specification of the Tucson format is found here: [http://www.ncdc.noaa.gov/paleo/treeinfo.html] though that specification cannot be
 +
fully trusted. E.g. it currently (2009-07-09) specifies the missing data mark to be 999, which value in reality is used as the stop marker.
 
<PRE>
 
<PRE>
 
PMkr12b 1781  120    87    69  122  108    85  125  114    77
 
PMkr12b 1781  120    87    69  122  108    85  125  114    77
Line 27: Line 28:
 
</PRE>
 
</PRE>
 
''An example of a sample saved in 0.01 mm units, which covers the timespan AD 1781-1814, with a missing ring for AD 1802 (-999). The width of AD 1781 (the first year) annual ring is 1.20 mm and for 1782 AD 0.87 mm.''
 
''An example of a sample saved in 0.01 mm units, which covers the timespan AD 1781-1814, with a missing ring for AD 1802 (-999). The width of AD 1781 (the first year) annual ring is 1.20 mm and for 1782 AD 0.87 mm.''
 +
 +
<PRE>
 +
PMkr12b 1781  1200  870  690  1220  1080  850  1250  1140  770
 +
PMkr12b 1790  1340  1310  1140  970  1170  490  690  1000  1230  890
 +
PMkr12b 1800  1370  890    0  790  440  380  620  990  680  260
 +
PMkr12b 1810  270  430  510  570  360 -9999
 +
</PRE>
 +
''The same sample written in 0.001 mm units. Note the missing data mark which is here "0".''
  
 
==Examples==
 
==Examples==

Revision as of 15:26, 9 July 2009

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