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DF020
Fire history dendrochronology study, super old growth data, central western Cascades, Oregon, 2002

AUTHOR:
Sheryl K. Giglia

PRINCIPAL INVESTIGATOR:
Frederick J. Swanson

ORIGINATOR:
Sheryl K. Giglia

OTHER RESEARCHER:
Peter D. Adrian Teensma, Peter H. Morrison, Peter J. Weisberg

DATA SET CONTACT PERSON:
Theresa J. Valentine

METADATA CONTACT:
Theresa J. Valentine

ABSTRACTOR:
Sheryl K. Giglia

DISTRIBUTOR:
Theresa J. Valentine

METADATA CREATION DATE:
10 May 2005

MOST RECENT METADATA REVIEW DATE:
10 Dec 2013

KEYWORDS:
Dendrochronology, Douglas-fir stands, Fire history, Old growth, Disturbance

PURPOSE:
Prepared for spatial analysis of sampling density, search intensity and super-old growth locations.

METHODS:

Processing Procedures - DF020:

Description:

DF02001 Super-old growth study sample site locations for supplemental field work (Sept. 2002 )

Sample site locations recorded with GPS unit. Table created in MS Excel with UTM x-y coordinates of sites. Point shapefile created from table of coordinates.

projected from NAD27 to NAD83

Processing Procedures - DF020 (2):

Description:

DF02002: Fire history studies used for super-old growth study, Giglia et. al. 2003, synthesis from Morrison & Swanson (unpublished); Teensma (1987); Weisberg (1998) and Giglia (unpublished) supplemental data,sample site locations

Elevation class was derived from a spatial join with "gen_aspect" shapefile and refers to the slope position in relation to proximal high ridges.

This shapefile was created by merging the following shapefiles: giglia_allsites; m&s_unpub_allsites; teensma_allsites; weisberg_allsites. Attributes merged were: researcher, x and y coordinates and SOG presence/absence.

Slope class was derived from a spatial join with "slope_class" shapefile and refers to the slope angle classified by degrees.

Site elevation was derived from a spatial join between site point locations and a 20m contour layer.

General aspect was derived from a spatial join with "gen_aspect" shapefile and refers to the general aspect of a slope, ignoring microtopography.

Fire chronology data were aggregated to century-scale and classified by severity as follows: Severity Class codes included from Class codes included from code:

Definition: M & S/Teensma fire chron. Weisberg fire chron.

H hi-severity fire occurred at least once 3, 4 5,7

M mixed-severity fire occured at least once 5 4

L low-severity fire occured at least once 1,2 1,2

S site not included in previous fire chronologies, but refer to sites where SOG exists; assumption is made that SOG post-dates high-severity fire. The fire chronologies referred to above are in ms excel format: "BRCHRONO" (DF15) and "brmfc" - see Don Henshaw..

projected from NAD27 to NAD83

Processing Procedures - DF020 (3):

Description:

DF02003: Super-old growth study area boundary

Area is the extent of super-old growth studies by Giglia, Morrison and Swanson, Teensma, and Weisberg. The extent of the sample locations was extended out to the watershed level, with some extended area of interest to the North and East.

Boundaries taken from existing watershed bounaries with extended areas digitized on-screen.

Processing Procedures - DF020 (4):

Description:

DF02004: Super-old growth study area boundary, divided into sub basins

Study area was divided into 8 "sub-areas", defined by watershed boundaries. Divisions were hand-drawn on-screen.

Processing Procedures - DF020 (5):

Description:

DF02005: Patches of terrain that fit the predictive model for SOG, have been harvested since 1977, and have not been previously sampled

Shapefile "clip_wnfveg6.shp" queried for areas that were harvested 1977 or later.

Shapefile "naspect_slope1" was intersected with the selection from step 1 query.

Intersection from step 2 was queried for patches that did not contain sample sites. This outcome was converted to a shapefile.

Processing Procedures - DF020 (6):

Description:

DF02006:Reclassified grid with four quadrant aspect classes and three slope position classes, generated from 10 meter DEM

Aspect grid layer derived from 10m DEM. Reclassified into 4 quadrants: NE,SE,SW, NW. New polygon layer created by drawing polygons around areas between ridgelines and stream valleys, classified by quadrant, ignoring microtopography.

Processing Procedures - DF020 (7):

Description:

DF02007: Shapefile "gen_aspect.shp" queried for NW and NE aspects. Shapefile "slope_class" queried for slope class "1" (0-15 degrees). Selections from the two shapefiles intersected to create this shapefile.

Processing Procedures - DF020 (8):

Description:

DF02008: Reclassified 10m DEM into 4 elevation classes: 480-680m; 700-980m; 1000-1280m; and 1300-1540m. Converted to shapefile.

Processing Procedures - DF020 (9):

Description:

DF02009: Shapefile created from reclassified grid with three elevation classes. Reclassified 10m DEM into 4 elevation classes: 480-680m; 700-980m; 1000-1280m; and 1300-1540m. Converted to shapefile.

Processing Procedures - DF020 (10):

Description:

DF02010: Downloaded 9 DEMs from Regional Ecosystem Office Geospatial Center (www.reo.gov): Belknap, Blue River, Carpenter Mountain, Echo Ridge, Harter Mountain, McKenzie Bridge, Tamolitch, Tidbits Mountain and Upper Soda. Merged DEMs with lattice function in ArcInfo.

Latticed 9 DEMs with ArcInfo software.

Processing Procedures - DF020 (11):

Description:

DF02011: Created by WNF using aerial photography and satellite imagery. (Willamette National Forest Veg6) Clipped to boundary of super-old growth study boundary by S. Giglia. Full metadata for current vegetation can be found at the following link: http://www.fs.fed.us/r6/willamette/manage/gis/veg8.htm

Processing Procedures - DF020 (12):

Description:

DF02012: Sample site locations digitized on large format digitizing table from mylar maps. Point shapefile created from digitized data. dbf file derived from fire chronology created by Peter Weisberg was joined to the shapefile. A new shapefile was then created to make fire chronology attributes a permanent part of the attribute table.

Citation: MS Excel spreadsheet "BRCHRONO" - DF15; Process_Date: August, 2003

Processing Procedures - DF020 (13):

Description:

DF02013: Study area boundary digitized from scanned map from Morrison & Swanson (1990). Process_Date: June 2003

Processing Procedures - DF020 (14):

Description:

DF02014: Boundary digitized from scanned copy of map from Morrison & Swanson (1990) fire history study.

Processing Procedures - DF020 (15):

Description:

DF02015: This shapefile was created by merging the following shapefiles: giglia_allsites; m&s_unpub_allsites; teensma_allsites; weisberg_allsites. Attributes merged were: researcher, x and y coordinates and SOG presence/absence.

A sub-set of the master shapefile ("sogstudy_allsites") with locations only of sites where SOG was found. All attribute data from master shapefile was carried forward, and additional data added, including available age-class data and tree-level data.

Site elevation was derived from a spatial join between site point locations and a 20m contour layer. Fire chronology data were aggregated to century-scale and classified by severity as follows:

This shapefile was created by merging the following shapefiles: giglia_allsites; m&s_unpub_allsites; teensma_allsites; weisberg_allsites. Attributes merged were: researcher, x and y coordinates and SOG presence/absence.

Slope class was derived from a spatial join with "slope_class" shapefile and refers to the slope angle classified by degrees.

Site elevation was derived from a spatial join between site point locations and a 20m contour layer.

General aspect was derived from a spatial join with "gen_aspect" shapefile and refers to the general aspect of a slope, ignoring microtopography.

Fire chronology data were aggregated to century-scale and classified by severity as follows: Severity Class codes included from Class codes included from code:

Definition: M & S/Teensma fire chron. Weisberg fire chron.

H hi-severity fire occurred at least once 3, 4 5,7

M mixed-severity fire occured at least once 5 4

L low-severity fire occured at least once 1,2 1,2

S site not included in previous fire chronologies, but refer to sites where SOG exists; assumption is made that SOG post-dates high-severity fire. The fire chronologies referred to above are in ms excel format: "BRCHRONO" (DF15) and "brmfc" - see Don Henshaw..

Elevation class was derived from a spatial join with "gen_aspect" shapefile and refers to the slope position in relation to proximal high ridges. Slope class was derived from a spatial join with "slope_class" shapefile and refers to the slope angle classified by degrees. General aspect was derived from a spatial join with "gen_aspect" shapefile and refers to the general aspect of a slope, ignoring microtopography.

Processing Procedures - DF020 (16):

Description:

DF02016: These point locations were digitized from the study area map in Teensma's 1987 publication. Spatial accuracy is unknown.

Study area map was scanned and point locations digitized on-screen.

DBF file derived from fire chronology created by Peter Weisberg was joined to the shapefile. A new shapefile was then created to make fire chronology attributes a permanent part of the attribute table

Citation:

Originator: Peter D.A. Teensma, Publication_Date: 1987, Title: Fire History and Fire Regimes of the Central Western Cascades of Oregon , Geospatial_Data_Presentation_Form: map, Other_Citation_Details: PhD dissertation, University of Oregon, Eugene, OR

MS Excel spreadsheet "BRCHRONO" - DF15

Processing Procedures - DF020 (17):

Description:

DF02017: Study area boundary digitized from scanned published map in Teensma (1987).

Processing Procedures - DF020 (18):

Description:

DF02018: All fields in this shapefile and the data contained in them were created by Peter Weisberg for his 1998 publication (PhD dissertation), with the following exceptions: "Site_ID," "researcher" and "SOG". These 3 fields were added by Giglia, and are explained under "entity attribute."

Instrumentation: GPS unit used to identify site locations. Spatial accuracy unknown.

Citation:

Originator: Peter J. Weisberg, Publication_Date: 1998, Title: Fire History, Fire Regimes and Development of Forest Structure in the Central Western Oregon Cascades, Other_Citation_Details: PhD dissertation, Oregon State University, Corvallis, OR, Type_of_Source_Media: electronic mail system

Processing Procedures - DF020 (19):

Description:

DF02019: Weisberg study area polygon selected from "brsites" ArcInfo coverage (from Berkley 2000). Converted to shapefile.

Processing Procedures - DF020 (20):

Description:

DF02020: All fields in this shapefile and the data contained in them were created by Peter Weisberg for his 1998 publication (PhD dissertation), with the following exceptions: "Site_ID" and "SOG", explained in "entity attribute" section.

Instrumentation: GPS unit used to identify site locations. Spatial accuracy unknown.

TAXONOMIC SYSTEM:
None

GEOGRAPHIC EXTENT:
Andrews Experimental Forest and Upper Blue River drainage, within the Willamette National Forest, western Cascades, Oregon, USA.

ELEVATION_MINIMUM (meters):

ELEVATION_MAXIMUM (meters):

PROGRESS DESCRIPTION:
Study collection is completed and no new collection is planned

UPDATE FREQUENCY DESCRIPTION:
There are no plans to update these data

CURRENTNESS REFERENCE:
"Publication date" refers to the range of dates during which the data is prepared for publication (this basis is used when generating data from a variety of sources, such as soil classifications, or if specific collection dates are unknown).