Recherche dans la collection - Annual tree-ring width and density chronologies from Prelude Lake, Northwest Territories [textual record (electronic)]

Notice descriptive – Brève
1
Annual tree-ring width and density chronologies from Prelude Lake, Northwest Territories [textual record (electronic)]

Niveau hiérarchique :

Dossier

Date :

1979.

Référence :

R214-3105-2-E, RG39

Genre de documents :

Documents textuels

Trouvé dans :

Archives / Collections et fonds

No d'identification :

1283957

Contexte de cette notice :

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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 Prelude Lake, Northwest Territories
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Notice descriptive – Détails
Date(s) :

1979.

Lieu de création :

Canada

Étendue :

18 files.

Langue du document :

anglais

Portée et contenu :

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This file contains tree ring chronology data for various trees in Canada.

The data were collected so present tree ring chronologies could be compared with other forms of proxy data with the purpose 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.

There are 18 files representing tree ring chronology data for 18 individual trees. As a result, there is one file for each tree sampled at the site.

Files were migrated from a binary data structure and placed on new preservation media in 2016.

Provenance :

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Créateur : Forintek Canada Corp

Nom(s) additionnel(s) :

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Instigateur : Forintek Canada Corporation

Information additionnelle :

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Note générale :

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 du titre :

Codebook for G0000855.

Conservation :

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Conservation note April 2016
There are 18 datasets associated for G0000855. 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 G0000855_Data01_Binary:
PL1YWST91116 PRELUDE LAKE, NWT. WHITE SPRUCE. SCANNED WITH .25 MM
SLIT. TRIGGERING LEVELS: .45 .38 .42. NOTE 1965-1979 ARE TIGHT RINGS.
..
1 1 19 16 18 8 -16 18 -12 14 1679826954
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 G0000855_Data01_Binary originally contained 470 records. The first four metadata records have been stripped from the file for a total 466 records. When the two records for each data set were concatenated into one record upon migration, the converted file now only contains 233 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.

Groupes de documents reliés :

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.

Caractéristiques du fichier informatique :

Database in flat file format
Vedette-matière :

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Tree-rings - Chronology

Arbres, Anneaux des - Chronologie

Tree-rings - Prelude Lake

Arbres, Anneaux des - Lac Prelude
Source :

Gouvernement

Ancien no de référence archivistique :

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RG39
Pour réserver ou commander des documents

Conditions d'accès :

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Documents textuels: électroniques

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