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Contributing Tree-Ring Fire Event Data

The International Multiproxy Paleofire Database (IMPD) at the World Data Center for Paleoclimatology archives raw high-resolution (seasonal to annual) dates of tree-ring derived fire events. Data should be grouped by stand or study "sites." These most often will be composites of "trees," although submissions may be individual trees if desired. Trees typically will consist of two elements: tree id and tree features. Features may take the form of several elements: pith/inside dates, fire scars, injuries, outside/bark dates, recorder years, non-recorder years. Fire scars and injuries also often have another associated element, ring position.

Fire Scar Data:

Data may be submitted in any convenient format. FHX2 files are the preferred format for tree-ring fire scar data. FHX2 was developed by Henri Grissino-Mayer at the University of Tennessee, and is described in his article: Henri D. Grissino-Mayer. 2001. FHX2 - Software for analyzing temporal and spatial patterns in fire regimes from tree rings. Tree-Ring Research 57(1): 115-124. Also see our Tree-Ring Fire Event Data Description page for a description of the ASCII text FHX2 data file format. Otherwise, ASCII files are preferred for other forms of tabular data (see this example data file). Data provided in proprietary formats may be returned for reformatting in ASCII. Any codes used for indicating feature data that differ from the standard FHX2 codes must be fully defined in the accompanying metadata.

Establishment Data:

Data may be submitted in any convenient format. ASCII text files (fixed-format, tab-delimited, comma-delimited, or space-delimited) are preferred for tabular data. FHX2 files are also accepted (see the "Fire Scar Data" section above for more details), but data provided in other proprietary formats may be returned for reformatting in ASCII. Establishment data files should include "inside date" information (e.g., earliest ring date, pith date, estimated establishment date) and "outside date" information (e.g., last ring date, bark date, estimated death date) for each tree (see this example data file). Inclusion of "middle" features (e.g., suppression, release, scarring) are encouraged. And please provide any available information regarding the methods used for determining estimated dates, either in the data file or via our data submission form. We also ask that any derived fire dates determined by the investigator, or references to publications containing those dates, be included, but listed separately as metadata.


We ask that you include some information (metadata) about the collection with the submission of the data. We have a data submission form that indicates the information we would like you to include.  The form can be filled out online and sent along with the data files all in one step. We can also accommodate bulk submissions of large contributions. Please contact our database managers for more information.

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