Collection search - Annual tree-ring width and density chronologies from Aklavik, Northwest Territories [textual record (electronic)]

Record information – Brief
1
Annual tree-ring width and density chronologies from Aklavik, Northwest Territories [textual record (electronic)]

Hierarchical level:

File

Date:

1972.

Reference:

R214-3096-5-E, RG39

Type of material:

Textual material

Found in:

Archives / Collections and Fonds

Item ID number:

1283936

Context of this record:

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Natural Resources Canada fonds

Canadian Forestry Service sous-fonds

Canadian Forest Service headquarters records

Annual tree-ring width and density chronologies from Aklavik, Northwest Territories
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Record information – Details

Date(s):

1972.

Place of creation:

Canada

Extent:

12 files.

Language of material:

English

Scope and content:

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QThis file contains information that pertains to a tree ring sample from the area of Aklavik, N.W.T. Included in the file is the raw data on magnetic tape, the associated summary chronologies, printed outputs of the tree ring parameters and density profile values. The specific objective of this study was to collect, process, and present tree ring chronologies that could be compared with other forms of proxy data for purposes of reconstructing past climatic records. An effort was made to collect from the oldest and most climatically sensitive trees on the site. Corollary objectives were to evaluate the dendrochronological quality of trees from this area and to produce tree ring chronologies which could be used for dating purposes.

Provenance:

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Creator: Forintek Canada Corp

Additional name(s):

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Originator: Forintek Canada Corporation

Additional information:

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General note:

CONSERVATION NOTE: Originally, the data base commenced with several identification and scanning information records written in ASCII; now these records are in EBCDIC. In addition, the unloaded database was changed from variable length to fixed length; each record was extended to a physical length of 120 columns.
STATEMENT OF RESPONSIBILITY NOTE: Forintek was previously known as the Western Forest Products Laboratory (WPFL).
COLLECTOR/COLLECTEUR: Forintek Canada Corporation
RELATED PUBLICATIONS: An extensive list of publications is available in the documentation package.
Originator (Principal Investigator): Forintek Canada Corporation

Source of title:

Codebook for G0000830.

Conservation:

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Conservation note April 2016
There are 12 datasets associated for G0000830. When these files were migrated from EBCDIC binary format to the ASCII encoding format in 2016, the files were totally restructured.
In some files in the series, there were two, three, four or five 120 byte ASCII records at the beginning of the file that contained metadata about each tree for a specific site. The following is an example for G0000830_Data01_Binary:
AK1YWST1890U
1089E
__
1 1 19 16 18 8 18 -16 19 16 538976288
These records have been stripped off of each dataset and been saved independently from the tree ring data in the Converted Headers directory under PM1. All of the original data resides in the PM0 directory.
In addition, in the original data files, there were two 120 byte data records for each year that is associated with a tree ring. When the files were converted, these two records were combined into one long record so the data could be used with spreadsheet applications such as Excel.
As an example, file G0000830_Data01_Binary originally contained 170 records. The first four metadata records have been stripped from the file for a total 166 records. When the two records for each data set were concatenated into one record upon migration, the converted file now only contains 83 records. Each of these records is associated with a specific year. The output data is 557 bytes long to allow space for the converted integer binary values.
In the situations where there were other than three metadata records at the beginning of the original file, different SAS runs were used.
The SAS runs used to convert the data are included as part of the metadata: CONVERT_TEMPLATE2.SAS is the code used for the files with 2 lines of 'header' and CONVERT_TEMPLATE3.SAS was used for 3, CONVERT4.SAS was used for 4, etc.

Custodial history:

All 12 files were migrated from a binary file format and placed on new preservation media in 2016.

There is one file for each tree in the sample.

Related material:

For all available material directly related to tree ring data please consult the following files: G0000819 to G0000820, G0000822 to G0000837, G0000854 to G0000861 and G0000896 to G0000905.

Type of computer file or data note:

Database in flat file format

Source:

Government

Former archival reference no.:

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RG39
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Conditions of access:

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Textual records: electronic

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