gnnfire

GNNFire Plot Databases

As part of the GNNFire project, we have compiled forest inventory plot databases for each of our three study areas. These databases have been standardized to be consistent across inventories and study areas and include a number of plot-level variables that can be mapped spatially.

Database Download

Study Area Product Description Download link (file size)
GNNFire - CaliforniaPlot database (MS Access format) (1.7 MB)
GNNFire - OregonPlot database (MS Access format) (1.0 MB)
GNNFire - WashingtonPlot database (MS Access format) (2.1 MB)

Appendix 3

Core vegetation and fuels variables joined to GNN imputation maps and used in accuracy assessments for species-size and structure models. All variables are at the at the forest class level (summary of all portions of a plot that are forest). All variables are in metric units. Check our website for future posting of english unit versions.

CATEGORY
VARIABLE NAME
DESCRIPTION
Plot identification
PLTID
Unique plot identification number
FCID
Unique forest class identification number
DATA_SOURCE
Source of the plot data

BLMWO BLM in western Oregon
FIACA FIA in California
FIAEW FIA in eastern Washington
FIAWO FIA in western Oregon
NCNP North Cascades National Park
R5 Forest Service Region 5
R6 Forest Service Region 6
SEKI Sequoia-Kings Canyon National Park
YOSE Yosemite National Park
Live tree
BAA_GE_3
Basal area (m2/ha) of all live trees >=2.54 cm dbh
BAC_GE_3
Basal area (m2/ha) of all live conifers >=2.54 cm dbh
BAH_GE_3
Basal area (m2/ha) of all live hardwoods >=2.54 cm dbh
BAH_PROP
Proportion of total live tree basal area that is hardwood
QMDA_DOM
Quadratic mean diameter (QMD) (cm) of all dominant and codominant trees
QMDC_DOM
QMD (cm) of all dominant and codominant conifers
QMDH_DOM
QMD (cm) of all dominant and codominant hardwoods
CANCOV
Canopy cover (percent) of all live trees, calculated using methods in the Forest Vegetation Simulator (Crookston and Stage 1999)
CANCOV_CON
Canopy cover (percent) of all conifers, calculated using methods in the Forest Vegetation Simulator (Crookston and Stage 1999)
CANCOV_HDW
Canopy cover (percent) of all hardwoods, calculated using methods in the Forest Vegetation Simulator (Crookston and Stage 1999)
STNDHGT
Average height (m) of dominant and codominant trees.
FORTYPBA
Forest type (alpha code comprised of one or two species codes). Assigned based on plurality of species basal area, as follows:

If CANCOV <10 then FORTYPBA = "remnant"; If BAH_PROP >=0.65 and >=80% of the hardwood basal area is in one species, a single hardwood species is assigned; otherwise FORTYPBA is named for the two predominant hardwood species. If BAH_PROP 0.20-0.64, FORTYPBA is named by the dominant hardwood species and the dominant conifer species, shown in order of most basal area. If BAHPROP <0.20 and >=80% of total conifer basal areas is in one species, FORTYPBA is that single (conifer) species; otherwise, FORTYPBA is named for the two predominant conifer species. Species codes are defined in the plot database.
VEGCLASS
Vegetation class from Johnson and O'Neil (2001)

1 Sparse (CANCOV <10)
2 Open (CANCOV 10-39)
3 Broadleaf, sap/pole, mod/closed (CANCOV >=40, BAH_PROP >=0.65, QMDA_DOM <25 cm )
4 Broadleaf, sm/med/lg, mod/closed (CANCOV >=40, BAH_PROP >=0.65, QMDA_DOM >25 cm)
5 Mixed, sap/pole, mod/closed (CANCOV >=40, BAH_PROP 0.20-0.64, QMDA_DOM <25 cm)
6 Mixed, sm/med, mod/closed (CANCOV >=40, BAH_PROP 0.20-0.64, QMDA_DOM 25-50 cm)
7 Mixed, large+giant, mod/closed (CANCOV >=40, BAH_PROP 0.20-0.64, QMDA_DOM >50 cm)
8 Conifer, sap/pole, mod/closed (CANCOV >=40, BAH_PROP <0.20, QMDA_DOM <25 cm)
9 Conifer, sm/med, mod/closed (CANCOV >=40, BAH_PROP <0.20, QMDA_DOM 25-50 cm)
10 Conifer, large, mod/closed (CANCOV >=40, BAH_PROP <0.20, QMDA_DOM 50-75 cm)
11 Conifer, giant, mod/closed (CANCOV >=40, BAH_PROP <0.20, QMDA_DOM >75 cm)
SIZECL
Size class from Johnson and O'Neil (2001, p. 116-119)

1 Shrub/seedling (QMDA_DOM <2.5 or CANCOV <10)
2 Sapling/pole (QMDA_DOM >=2.5 and <25.0)
3 Small tree (QMDA_DOM >=25.0 and <37.5)
4 Medium tree (QMDA_DOM >=37.5 and <50.0)
5 Large tree (QMDA_DOM >=50.0 and <75)
6 Giant tree (QMDA_DOM >=75.0)
COVCL
Cover class from Johnson and O'Neil (2001, p. 116-119)

1 Sparse/remnant (CANCOV <10)
2 Open (CANCOV >=10 and <40)
3 Moderate (CANCOV >=40 and <70)
4 Closed (CANCOV >=70)
CWHR_SIZE
Size class from California Wildlife Habitat Relationships Program (Mayer and Laudenslayer 1988) (California only)

1 Seedling tree (CANCOV < 10)
2 Sapling tree (CANCOV >= 10 and QMDA_DOM 2.54-15.24)
3 Pole tree (CANCOV >= 10 and QMDA_DOM 15.24-27.94)
4 Small tree (CANCOV >= 10 and QMDA_DOM 27.94-60.96)
5 Medium/large tree (CANCOV >= 10 and QMDA_DOM > 60.96)
6 Multi-layered tree (CANCOV >= 60 and at least two canopy layers present)
CWHR_DENSITY
Canopy closure class from CWHR (Mayer and Laudenslayer 1988) (California only)

NA (not applicable -- CANCOV <10)
S (sparse, CANCOV 10-24)
P (open, CANCOV 25-39)
M (moderate, CANCOV 40-59)
D (dense, CANCOV 60-100)
Understory
SHRCOV
Cumulative cover (percent) of all shrubs (may be >100%). [Not available for Oregon.]
Snag
STPH_GE_25
Density (trees/ha) of snags >=25.0 cm dbh and >=2.0 m tall
STPH_GE_50
Density (trees/ha) of snags >=50.0 cm dbh and >=2.0 m tall
SVPH_GE_25
Volume (m3/ha) of snags >=25.0 cm dbh and >=2.0 m tall
SVPH_GE_50
Volume (m3/ha) of snags >=50.0 cm dbh and >=2.0 m tall
SBPH_5_9
Biomass (kg/ha) of snags 5-9 inches (12.7-22.9 cm) dbh and >=2.0 m tall
SBPH_9_20
Biomass (kg/ha) of snags 9-20 inches (22.9-50.8 cm) dbh and >=2.0 m tall
SBPH_GE_20
Biomass (kg/ha) of snags >=20 inches (50.8 cm) dbh and >=2.0 m tall
Down wood
DVPH_GE_25
Volume (m3/ha) of down wood >=25.4 cm diameter at intercept and >=1 m long. [R5 plots limited to pieces >=3.0 m long. FIA plots do not include decay class 5 logs.]
DVPH_GE_50
Volume (m3/ha) of down wood >=50.0 cm diameter at intercept and >=1 m long. [R5 plots limited to pieces >=3.0 m long. FIA plots do not include decay class 5 logs.]
DBPH_9_20
Biomass (kg/ha) of down wood 9-20 inches (22.9-50.8 cm) diameter at large end and >=1 m long. [R5 plots limited to >=10 in (25.4 cm) diameter and >=3.0 m long. FIA plots do not include decay class 5 logs. Missing decay class set=3 for YOSE.]
DBPH_GE_20
Biomass (kg/ha) of down wood >=20 inches (50.8 cm) diameter at intercept and >=1 m long. [R5 plots limited to >=3.0 m long. FIA plots do not include decay class 5 logs. Missing decay class set=3 for YOSE.]
Canopy and surface fuels
PCANFWT
Total weight of all available canopy fuels (kg/ha), which includes the mass of live conifer foliage plus one-half the mass of live and dead conifer branches in the 0-0.25 inch size class (see Appendix 2). Based on equations for the coastal Pacific Northwest (used for Oregon).
RCANFWT
Total weight of all available canopy fuels (kg/ha), which includes the mass of live conifer foliage plus one-half the mass of live and dead conifer branches in the 0-0.25 inch size class (see Appendix 2). Based on equations for the northern Rocky Mountains (used for California and Washington).
PHTCBU2
Height to crown base (m) computed with vertical layering method, 'uncompacted' crowns, and equations for the coastal Pacific Northwest (see Appendix 2) (used for Oregon). Code '999' is assigned where there is minimal crown.
RHTCBU2
Height to crown base (m) computed with vertical layering method, 'uncompacted' crowns, and equations for the northern Rocky Mountains (see Appendix 2) (used for California and Washington). Code '999' is assigned where there is minimal crown.
PCBDU2
Canopy bulk density (kg/m3) computed with vertical layering method, 'uncompacted' crowns, and equations for the coastal Pacific Northwest (see Appendix 2) (used for Oregon).
RCBDU2
Canopy bulk density (kg/m3) computed with vertical layering method, 'uncompacted' crowns, and using equations for the northern Rocky Mountains (see Appendix 2) (used for California and Washington).
FUEL_MODEL
Fire behavior fuel model. For all study areas, classification rules were modified slightly from those in documentation for the appropriate variant of FVS-FFE and to reflect the fuels and vegetation variables available in the GNNFire database (see Appendix 2) and local expert knowledge.

1 short grass
2 timber (grass and understory)
5 brush
6 dormant brush, hardwood slash
8 closed timber litter
9 hardwood litter
10 timber (litter and understory)
11 light logging slash
12 medium logging slash
26 modified chaparral (California)