Paired quality assurance and operational field data from the northern region of the U.S. Forest Inventory and Analysis program

Metadata:

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Geographic:

Latitude_Resolution: 0.00000100

Longitude_Resolution: 0.00000100

Geographic_Coordinate_Units: Decimal Degrees

Geodetic_Model:

Horizontal_Datum_Name: North American Datum of 1983

Ellipsoid_Name: Geodetic Reference System 80

Semi-major_Axis: 6378137.0000

Denominator_of_Flattening_Ratio: 298.25722210

Entity_and_Attribute_Information:

Overview_Description:

Entity_and_Attribute_Overview:

Below you will find a list and description of the files included in this data publication.

In these variable descriptions you will see references to variables that are available in the FIADB. Here are short descriptions of a few of these variables:

PLOT.KINDCD = Sample kind code. A code indicating the type of plot installation. Database users may also want to examine DESIGNCD to obtain additional information about the kind of plot being selected.
Note: Revisited plots with KINDCD = 1 and 3 are not used in remeasurement estimates.

PLOT.MANUAL = Manual (field guide) version number. Version number of the Field Guide used to describe procedures for collecting data on the plot. The National FIA Field Guide began with version 1.0; therefore, data taken using the National Field procedures will have MANUAL >=1.0. Data taken according to field instructions prior to the use of the National Field Guide have MANUAL <1.0.

SURVEY.RSCD = Region or Station code. Identification number of the Forest Service National Forest System Region or Station (FIA work unit) that provided the inventory data.

SURVEY.STATECD = State code. Bureau of the Census Federal Information Processing Standards (FIPS) 2-digit code for each State. Refer to The Forest Inventory and Analysis Database: Database Description User Guide for Phase 2 for codes (appendix: State, Survey Unit, and County Codes) (available at web address: https://www.fia.fs.usda.gov/library/database-documentation/).

PLOT.DESIGNCD = Design code. A code indicating the type of plot design used to collect the data. Refer to The Forest Inventory and Analysis Database: Database Description User Guide for Phase 2 for codes (appendix: Forest Inventory and Analysis [FIA] Plot Design Codes and Definitions by FIA Work Unit) (available at web address: https://www.fia.fs.usda.gov/library/database-documentation/).



INFORMATIONAL FILES (3)

1. \Data\_variable_descriptions.csv: Comma-separated values (CSV) file containing a list and description of variables found in all data files. (A more complete description of these variables is also provided in the metadata below.)

Columns include:

FILENAME = Name of data file
ATTRIBUTECODE = Variable code
ATTRIBUTENAME = Name of variable
TYPE = Type of variable
UNITS = Units (if applicable)
PRECISION = Precision (if applicable)
DESCRIPTION = Description of variable (IMPORTANT: These descriptions do not include a complete explanation of the individual codes used, please see complete file descriptions below for that information.)


2. \Data\CODES_species.csv: CSV file containing a list and description of species codes used in these data files. This information was pulled directly from Appendix F in Burrill et al. 2010, which points to the REF_SPECIES table in the FIA DataMart.

Columns include:

SPECCODE = Species code
COMMONNAME = Common name of species
GENUS = Genus of species
SPECIES = Scientific species name
VARIETY = Variety of species
SUBSPECIES = Sub species
SPECIES_SYMBOL = Letter code used to represent species


3. \Data\CODES_state_county.csv: CSV file containing a list and description of state and county codes used in these data files.

Columns include:

STATECD = Bureau of the Census Federal Information Processing Standards (FIPS) two-digit code for each State
STATE_NAME = The name of the state
STATE_ABBR = The abbreviation for the state
COUNTYCD = The identification number for a county, parish, watershed, borough, or similar governmental unit in a State
COUNTYNM = The name of the county



DATA FILES (8)

There are 8 CSV data files included in this publication. Where applicable, variable definitions have been combined. Combined variable definitions will contain an F_VARIABLE and a Q_VARIABLE. The “F” stands for the Field Team, while the “Q” stands for the Quality Assurance Team. These FIA variables are also defined in Burrill et al. (2010) "The Forest Inventory and Analysis Database: database description and user guide for phase 2" (version 9.0.1).

Please note, the following variables are found in all data files:

FLD_CN = Field Sequence number

QA_CN = Quality Assurance sequence number

STATECD = Bureau of the Census Federal Information Processing Standards (FIPS) two-digit code for each state (see CODES_state_county.csv for a description of these codes)

COUNTYCD = The identification number for a county, parish, watershed, borough, or similar governmental unit in a state. (See CODES_state_county.csv for a description of these codes or Appendix B in Burrill et al. 2010.)

PLOT = An identifier for a plot. Along with STATECD, UNITCD, INVYR, COUNTYCD and/or some other combinations of variables, PLOT may be used to uniquely identify a plot.

INVYR = The year that best represents when the inventory data were collected. [YYYY]


1. \Data\Boundary.csv: CSV file containing paired boundary information.

Variables include:

F_SUBPLOT & Q_SUBPLOT = The number assigned to the subplot. The national plot design (PLOT.DESIGNCD = 1) has subplot number values of 1 through 4.

F_SUBPTYP & Q_SUBPTYP = Plot type code. Specifies whether the boundary data are for a subplot, microplot, or macroplot.
1 = subplot
2 = microplot
3 = macroplot

F_CONTRAST & Q_CONTRAST = The condition class number of the condition class that contrasts with the condition class located at the subplot center (for boundaries on the subplot or macroplot) or at the microplot center (for boundaries on the microplot), e.g., the condition class present on the other side of the boundary.
1 = indicates the CONDID value was 1
2 = indicates the CONDID value was 2
3 = indicates the CONDID value was 3
4 = indicates the CONDID value was 4

F_AZMLEFT & Q_AZMLEFT = The azimuth, to the nearest degree, from the subplot, microplot, or macroplot plot center to the farthest left point (facing the contrasting condition class) where the boundary intersects the subplot, microplot, or macroplot plot circumference.

F_AZMCORN & Q_AZMCORN = The azimuth, to the nearest degree, from the subplot, microplot, or macroplot plot center to a corner or curve in a boundary.

F_DISTCORN & Q_DISTCORN = The horizontal distance, to the nearest 1 foot, from the subplot, microplot, or macroplot plot center to the boundary corner point.

F_AZMRIGHT & Q_AZMRIGHT = The azimuth, to the nearest degree, from subplot, microplot, or macroplot plot center to the farthest right point (facing the contrasting condition) where the boundary intersects the subplot, microplot, or macroplot plot circumference.

F_BNDCHG & Q_BNDCHG = A code indicating the relationship between previously recorded and current boundary information. Set to blank (null) for new plots (PLOT.KINDCD = 1 or 3).
0 = no change - boundary is the same as indicated on plot map and/or data collected by a previous crew
1 = New boundary, or boundary data has been changed to reflect an actual on-the-ground physical change resulting in a difference from the boundaries recorded.
2 = Boundary has been changed to correct an error from previous crew.
3 = Boundary has been changed to reflect a change in variable definition.


2. \Data\Condition.csv: CSV file containing condition level information.

Variables include:

F_CONDID & Q_CONDID = Unique identifying number assigned to each condition on a plot.

F_COND_STATUS & Q_COND_STATUS = A code indicating the basic land classification.
1 = accessible forest land
2 = nonforest land
3 = noncensus water
4 = census water
5 = nonsampled, possibility of forest land

F_RESRV & Q_RESRV = A code indicating the reserved status of the condition on publicly owned land. Starting with PLOT.MANUAL 6.0, the description has been modified to match FIA's new application of the definition for reserved land.
0 = not reserved
1 = reserved

F_OWNGRP & Q_OWNGRP = A code indicating the ownership group of the land for the condition.
10 = Forest Service
20 = other federal
30 = state and local government
40 = private

F_FLDTYP & Q_FLDTYP = A code indicating the forest type, assigned by the field crew, based on the tree species or species groups forming a plurality of all live stocking. These codes are defined in Appendix D. Forest Type Codes and Names in Burrill et al. (2021).

F_MAPDEN & Q_MAPDEN = A code indicating the relative tree density of the condition. Codes other than 1 are used as an indication that a significant difference in tree density is the only factor causing another condition to be recognized and mapped on the plot.
1 = initial tree density class
2 = density class 2 (density different than density of the condition assigned a tree density class of 1)
3 = density class 3 (density different than density of the condition assigned a tree density classes 1 and 2)

F_FLDAGE & Q_FLDAGE = For annual inventories (PLOT.MANUAL 1.0), stand age is equal to the field-recorded stand age (FLDAGE).

F_FLDSZCD & Q_FLDSZCD = A code indicating the field-assigned classification of the predominant (based on stocking) diameter class of live trees within the condition. May not be populated for some FIA work units when PLOT.MANUAL <1.0. Below we provide a basic description of the codes - see Burrill et al. (2010) for complete details.
0 = nonstocked
1 = ≤4.9 inches (seedlings/saplings)
2 = 5.0-8.9 inches (softwoods) / 5.0-10.9 inches (hardwoods)
3 = 9.0-19.9 inches (softwoods) / 11.0-19.9 inches (hardwoods)
4 = 20.0-39.9 inches
5 = 40.0_+ inches

F_STDORGCD & Q_STDORGCD = A code indicating the method of stand regeneration for the trees in the condition. An artificially regenerated stand is established by planting or artificial seeding.
0 = natural stands
1 = clear evidence of artificial regeneration

F_STDORGSP & Q_STDORGSP = The species code for the predominant artificially regenerated species (only populated when STDORGCD = 1). See CODES_species.csv for a list and description of these codes, but note that this information was pulled directly from the information provided in Appendix F in Burrill et al. 2010, which points to the REF_SPECIES table in the FIA DataMart.

F_PRESNFCD & Q_PRESNFCD = A code indicating the current nonforest land use for conditions that were previously classified as forest but are now classified as nonforest.
10 = agricultural land
11 = cropland
12 = pasture (improved through cultural practices)
13 = idle farmland
14 = orchard
15 = Christmas tree plantation
16 = maintained wildlife opening
17 = windbreak/shelterbelt
20 = rangeland
30 = developed
31 = cultural (business, residential, other intense human activity)
32 = rights-of-way (improved road, railway, power line)
33 = recreation (park, golf course, ski run)
40 = other (undeveloped beach, marsh, bog, snow, ice)


3. \Data\PairedSubplots.csv: CSV file containing paired subplot level information regarding boundary presence and tree counts.

Variables include:

PLOT_FIADB = An identifier for a plot. Along with STATECD, INVYR, UNITCD, COUNTYCD and/or some other combinations of variables, PLOT may be used to uniquely identify a plot.

SUBP = The number assigned to the subplot. The national plot design (PLOT.DESIGNCD = 1) has subplot number values of 1 through 4.

SUBP_STAT_F = A code indicating whether or not forest land was sampled on the subplot/macroplot. May be blank (null) in periodic inventories and where SUBP >4.

SUBP_STAT_Q = A code indicating whether or not forest land was sampled on the subplot/macroplot. May be blank (null) in periodic inventories and where SUBP >4.

BOUND_F = Indicates (Y/N) whether the crew established that there was a boundary delineating within subplot conditions.

BOUND_Q = Indicates (Y/N) whether the crew established that there was a boundary delineating within subplot conditions.

NUM_TR_FLD = Number of FC trees on the subplot

NUM_TR_QA = Number of QA trees on the subplot

NUM_TR_EQUAL = Indicates (Y/N) whether the two crews found the same number of trees in a subplot

NUM_FLD-NUM_QA = Tree count difference

FLD_EXTRA = Count of extra FC trees on a subplot

QA_EXTRA = Count of extra QA trees on a subplot


4. \Data\Plot.csv: CSV file containing paired plot level information.

Variables include:

LAT = The approximate latitude of the plot in decimal degrees using NAD 83 datum.

LON = The approximate longitude of the plot in decimal degrees using NAD 83 datum.

F_PLOT_STATUS & Q_PLOT_STATUS = A code that describes the sampling status of the plot. May not be populated for some FIA work units when MANUAL <1.0.
1 = sampled - at least one accessible forest land condition present on plot
2 = sampled - no accessible forest land condition present on plot
3 = nonsampled

F_MEASYEAR & Q_MEASYEAR = The year in which the plot was completed. MEASYEAR may differ from INVYR. May be blank (null) for periodic inventory or when PLOT_STATUS_CD = 3 (which means nonsampled).

F_MEASMON & Q_MEASMON = The month in which the plot was completed. May be blank (null) for periodic inventory or when PLOT_STATUS_CD = 3 (which means nonsampled).

F_MEASDAY & Q_MEASDAY = The day of the month in which the plot was completed. May be blank (null) for periodic inventory or when PLOT_STATUS_CD = 3 (which means nonsampled).

F_WATERCD & Q_WATERCD = Water body <1 acre in size or a stream <30 feet wide that has the greatest impact on the area within the sampled portions of any of the four subplots.
0 = none - no water sources within the sampled condition class(es)
1 = permanent streams or ponds too small to qualify as noncensus water
2 = permanent water in the form of deep swamps, bogs, marshes without standing trees present and less than 1.0 acre in size, or with standing trees
3 = ditch/canal - human-made channels used as a means of moving water, e.g., for irrigation or drainage, which are too small to qualify as noncensus water
4 = temporary streams
5 = flood zones - evidence of flooding when bodies of water exceed their natural banks
9 = other temporary water

F_LAT & Q_LAT = The approximate latitude of the plot in decimal degrees using NAD 83 datum.

F_LON & Q_LON = The approximate longitude of the plot in decimal degrees using NAD 83 datum.

F_ELEV & Q_ELEV = The distance the plot is located above sea level, in feet.

F_RDDIST & Q_RDDIST = The straight-line distance from plot center to the nearest improved road, which is a road of any width that is maintained as evidenced by pavement, gravel, grading, ditching, and/or other improvements.
1 = 100 feet (ft) or less
2 = 101 ft to 300 ft
3 = 301 ft to 500 ft
4 = 501 ft to 1000 ft
5 = 1001 ft to 1/2 mile
6 = 1/2 to 1 mile
7 = 1 to 3 miles
8 = 3 to 5 miles
9 = > 5 miles

F_SUBP_EXAMINED & Q_SUBP_EXAMINED = A code indicating the number of subplots examined. By default, PLOT_STATUS_CD = 1 plots have all 4 subplots examined.


5. \Data\Seedling.csv: CSV file containing paired microplot information relating to seedlings.

Variables include:

F_SUBP & Q_SUBP = The number assigned to the subplot. The national plot design (PLOT.DESIGNCD = 1) has subplot number values of 1 through 4.

F_CONDID & Q_CONDID = The unique identifying number assigned to a condition on which the seedling(s) is located, and is defined in the Condition.csv file.

F_SPECIES & Q_SPECIES = An FIA species code identifying the tree species of the seedling count. See CODES_species.csv for a list and description of these codes, but note that this information was pulled directly from the information provided in Appendix F in Burrill et al. 2010, which points to the REF_SPECIES table in the FIA DataMart.

F_GENUS & Q_GENUS = An FIA species code identifying the tree genus of the seedling count. See CODES_species.csv for a list and description of these codes, but note that this information was pulled directly from the information provided in Appendix F in Burrill et al. 2010, which points to the REF_SPECIES table in the FIA DataMart.

F_TREECOUNT & Q_TREECOUNT = The number of live seedlings (DIA < 1.0 inches) present on the microplot by species and condition class.


6. \Data\Subplot.csv: CSV file containing paired subplot level information.

Variables include:

SUBP = The number assigned to the subplot. The national plot design (PLOT.DESIGNCD = 1) has subplot number values of 1 through 4.

F_SUBPCOND & Q_SUBPCOND = The unique identifying number assigned to a condition at the center of the subplot.

F_MICRCOND & Q_MICRCOND = The unique identifying number assigned to a condition at the center of the microplot.

F_SUBP_STATUS & Q_SUBP_STATUS = A code indicating whether or not forest land was sampled on the subplot/macroplot. May be blank (null) in periodic inventories and where SUBP >4.
1 = Sampled, at least one accessible forest land condition present
2 = Sampled, no accessible forest land condition present
3 = Nonsampled, possibility of forest land

F_SLOPE & Q_SLOPE = The predominant or average angle of the slope across the subplot, to the nearest 1 percent. Valid values are 0 through 155.

F_ASPECT & Q_ASPECT = The aspect across the subplot, to the nearest 1 degree. Aspect is measured by sighting along the direction used to determine slope.

F_WATERDEP & Q_WATERDEP = The approximate depth in feet of water or snow covering the subplot. Not collected for certain FIA work units in 1999 (SURVEY.RSCD = 23, 24).


7. \Data\Tree.csv: CSV file containing tree level information.

Variables include:

F_CONDID & Q_CONDID = Unique identifying number assigned to a condition on which the tree is located.

F_SUBP & Q_SUBP = The number assigned to the subplot. The national plot design (PLOT.DESIGNCD = 1) has subplot number values of 1 through 4.

F_TREE & Q_TREE = A number used to uniquely identify a tree on a subplot.

F_SPCD & Q_SPCD = FIA tree species code. See CODES_species.csv for a list and description of these codes, but note that this information was pulled directly from the information provided in Appendix F in Burrill et al. 2010, which points to the REF_SPECIES table in the FIA DataMart.

F_DIA & Q_DIA = Diameter of tree at breast height, in inches.

F_AZIMUTH & Q_AZIMUTH = The azimuth, to the nearest degree, from the subplot, microplot, or macroplot plot center to the farthest left point (facing the contrasting condition class) where the boundary intersects the subplot, microplot, or macroplot plot circumference.

F_DIST = The distance of the tree from plot center FC team, in feet.

Q_DIST = The distance of the tree from plot center QA team, in feet.

F_STATUSCD & Q_STATUSCD = Whether a sample tree is live, cut, or dead at the time of measurement
0 = no status
1 = live tree
2 = dead tree
3 = removed - cut and removed by direct human activity

F_DIAHTCD & Q_DIAHTCD = A code indicating the location at which diameter was measured.
1 = diameter measured at 1.37 meters
2 = diameter measured at the root collar

F_DIACHECK & Q_DIACHECK = A code indicating the reliability of the diameter measurement.
0 = diameter accurately measured
1 = diameter estimated
2 = diameter measured at different location than previous measurement

F_HT & Q_HT = Total length of a tree's main stem (includes broken portions), in feet.

F_HTCD & Q_HTCD = A code indicating how length (height) was determined beginning in PLOT.
1 = field measured (total and actual length)
2 = total length visually estimated in the field, actual length measured
3 = total and actual lengths are visually estimated
4 = estimated with a model

F_ACTUALHT & Q_ACTUALHT = The total length of a tree to the highest standing portion, in feet.

F_TREECLCD & Q_TREECLCD = General quality of live and dead trees rated as growing stock, cull, and rotten cull.
2 = growing stock
3 = rough cull
4 = rotten cull

F_CR & Q_CR = The percent of the tree bole supporting live, healthy foliage (the crown is ocularly compacted to fill in gaps) when compared to actual length (ACTUALHT).

F_CCLCD & Q_CCLCD = General quality of live and dead trees rated as growing stock, cull, and rotten cull.
1 = open grown
2 = dominant
3 = codominant
4 = intermediate
5 = overtopped

F_TREEGRCD & Q_TREEGRCD = Merchantable quality of saw timber-sized trees
1 = grade 1
2 = grade 2
3 = grade 3
4 = grade 4
5 = grade 5

F_AGENTCD & Q_AGENTCD = Cause of Death
00 = no agent recorded
10 = insect
20 = disease
30 = fire
40 = animal
50 = weather
60 = vegetation (e.g., suppression)
70 = unknown
80 = silvicultural or land clearing activity

F_DECAYCD & Q_DECAYCD = Stage of decay in a standing dead tree
1 = All limbs and branches are present; the top of the crown is still present; all bark remains; sapwood is intact, with minimal decay; heartwood is sound and hard.
2 = There are few limbs and no fine branches; the top may be broken; a variable amount of bark remains; sapwood is sloughing with advanced decay; heartwood is sound at base but beginning to decay in the outer part of the upper bole.
3 = Only limb stubs exist; the top is broken; a variable amount of bark remains; sapwood is sloughing; heartwood has advanced decay in upper bole and is beginning at the base.
4 = Few or no limb stubs remain; the top is broken; a variable amount of bark remains; sapwood is sloughing; heartwood has advanced decay at the base and is sloughing in the upper bole.
5 = No evidence of branches remains; the top is broken; <20 percent of the bark remains; sapwood is gone; heartwood is sloughing throughout.

F_WDLDSTEM & Q_WDLDSTEM = Number of live and dead stems measured at the root collar used to calculate diameter
1 = 1 stem
2 = 2 stem
3 = 3 stem
4 = 4 stem
5 = 5 stem

F_MORTYR & Q_MORTYR = The estimated year in which a remeasured tree died or was cut.

F_SALVCD & Q_SALVCD = A standing or down dead tree categorized as merchantable or non-merchantable
0 = dead not salvable
1 = dead salvable

F_UNCRCD & Q_UNCRCD = Percentage determined by dividing the live crown length (including gaps) by the actual tree length.

F_CPOSCD & Q_CPOSCD = Relative position of each tree in relation to the overstory canopy
1 = superstory
2 = overstory
3 = understory

F_CLIGHTCD & Q_CLIGHTCD = Amount of light being received by the tree crown
0 = receives no direct sunlight because it is shaded by adjacent trees or other vegetation
1 = receives full light from the top or 1 side
2 = receives full light from the top and 1 side (or 2 sides without the top)
3 = receives full light from the top and 2 sides (or 3 sides without the top)
4 = receives full light from the top and 3 sides
5 = receives full light from the top and 4 sides

F_CVIGORCD & Q_CVIGORCD = Crown vigor of saplings between 2.5 and 12.5 centimeters diameter at breast height (DBH) or diameter at root collar (DRC)
1 = Saplings must have an uncompacted live crown ratio of 35 or higher, have <5 percent dieback (deer/rabbit browse is not considered as dieback but is considered missing foliage) and 80 percent or more of the foliage present is normal or at least 50 percent of each leaf is not damaged or missing. Twigs and branches that are dead because of normal shading are not included.
2 = Saplings do not meet class 1 or 3 criteria. They may have any uncompacted live crown ratio, may or may not have dieback and may have between 21 and 100 percent of the foliage classified as normal.
3 = Saplings may have any uncompacted live crown ratio and have 1 to 20 percent normal foliage or the percent of foliage missing combined with the percent of leaves that are over 50 percent damaged or missing should equal 80 percent or more of the live crown. Twigs and branches that are dead because of normal shading are not included. Code is also used for saplings that have no crown by definition.

F_CDENCD & Q_CDENCD = The amount of branches, foliage and reproductive structures that block light visibility through the crown, measured as a percentage.

F_CDIEBKCD & Q_CDIEBKCD = Amount of recent dead material in the upper and outer portion of the crown, measured as a percentage.

F_TRANSCD & Q_TRANSCD = Amount of light penetrating the foliated portion of the crown.

F_HTDMP & Q_HTDMP = This value is equal to the actual length, to the nearest 0.1 foot, from ground to the point of diameter measurement.

F_CULL_FLD & Q_CULL_FLD = Rotten/missing cull, field-recorded, measured as percentage.

F_RECONCILECD & Q_RECONCILECD = A code indicating the reason a tree either enters or is no longer a part of the inventory.
1 = ingrowth
2 = through growth
3 = missed live tree
4 = missed dead tree
5 = live tree shrank
6 = physical movement
7 = cruiser error
8 = procedural change
9 = nonsampled area

F_STANDING_DEAD_CD & Q_STANDING_DEAD_CD = An indication if a tree qualifies as standing dead.
0 = tree is not standing dead
1 = tree is a standing dead tree


8. \Data\TreeVolume.csv: CSV file containing paired tree level information including basal area, biomass, and volume calculations.

Variables include:

F_PLT_CN & Q_PLT_CN = Plot Sequence Number

F_TRE_CN & Q_TRE_CN = Tree Sequence Number

SUBP = An identifier for a subplot. Along with STATECD, INVYR, UNITCD, COUNTYCD and/or some other combinations of variables, PLOT may be used to uniquely identify a subplot.

OWNGRPCD = A code indicating the ownership group of the land for the condition.
10 = Forest Service
20 = Other federal
30 = State and local government
40 = Private

FORTYPCD = A code indicating the forest type, assigned by the field crew, based on the tree species or species groups forming a plurality of all live stocking. These codes are defined in Appendix D. Forest Type Codes and Names in Burrill et al. (2021).

FORTYPGRP = A code indicating the forest type group. These codes are defined in Appendix D. Forest Type Codes and Names in Burrill et al. (2021).

STDAGE = Estimated age of the forest stand as determined by the field crew.

STDSZCD = A classification of the predominant (based on stocking) diameter class of live trees within the condition assigned using an algorithm.
1 = large diameter stands
2 = medium diameter stands
3 = small diameter stands
5 = nonstocked

F_CONDID & Q_CONDID = Unique identifying number assigned to a condition on which the tree is located.

F_VOL_LOC_GRP & Q_VOL_LOC_GRP = An identifier indicating the equations used for calculations of volume, biomass, site index, etc.

F_BALIVE & Q_BALIVE = Basal area in square feet per acre of all live trees >=1.0 inch DBH/DRC. sampled in the condition.

F_SITREE & Q_SITREE = Calculated site index. Computed for every tree.

F_TREE & Q_TREE = A number used to uniquely identify a tree on a subplot.

F_SPCD & Q_SPCD = FIA tree species code

F_DIA & Q_DIA = Diameter of tree at breast height

F_BA_TREE & Q_BA_TREE = Calculated basal of the tree based on tree diameter

F_HT & Q_HT = Total length of a tree's main stem (includes broken portions)

F_ACTUALHT & Q_ACTUALHT = The total length of a tree to the highest standing portion

F_SAWHT & Q_SAWHT = The length (height) of a tree, recorded to a 7-inch top (9-inch for hardwoods), where at least one 8-foot log, merchantable or not, is present.

F_BOLEHT & Q_BOLEHT = The length between the 1-foot stump and the 4.0-inch top diameter of outside bark (DOB), where at least one 4-foot section is present. For annual inventories, this attribute is a calculated, modeled value.

F_CR & Q_CR = The percent of the tree bole supporting live, healthy foliage (the crown is ocularly compacted to fill in gaps) when compared to actual length (ACTUALHT).

F_WDLDSTEM & Q_WDLDSTEM = Number of live and dead stems measured at the root collar used to calculate diameter

F_TREECLCD & Q_TREECLCD = General quality of live and dead trees rated as growing stock, cull, and rotten cull

F_VOLCFGRS & Q_VOLCFGRS = Gross cubic-foot volume in the central stem of sample trees greater than or equal to 5.0 inches DBH from a 1-foot stump to a minimum 4-inch top.

F_VOLCSGRS & Q_VOLCSGRS = Gross cubic-foot volume in the sawlog portion of a sawtimber tree.

F_VOLBFGRS & Q_VOLBFGRS = Gross board-foot volume (International 1/4-inch rule) in the sawlog portion of a sawtimber tree.

F_VOLCFNET & Q_VOLCFNET = Net cubic-foot volume of wood in the central stem of a sample tree >= 5.0 inches DBH, from a 1-foot stump to a minimum 4-inch top diameter. Does not include volume loss due to rotten, missing, and form cull defect.

F_VOLCSNET & Q_VOLCSNET = Net cubic-foot volume in the sawlog portion of a sawtimber tree. The net volume of wood in the central stem of a timber species tree of sawtimber size (9.0 inches DBH minimum for softwoods, 11.0 inches DBH minimum for hardwoods), from a 1-foot stump to a minimum top diameter, (7.0 inches for softwoods, 9.0 inches for hardwoods). Does not include volume loss due to rotten, missing, and form cull defect.

F_VOLBFNET & Q_VOLBFNET = Net board-foot (International ¼-inch Rule) volume of wood in the central stem of a timber species tree of sawtimber size (9.0 inches DBH minimum for softwoods, 11.0 inches DBH minimum for hardwoods), from a 1-foot stump to a minimum top diameter (7.0 inches for softwoods, 9.0 inches for hardwoods). Does not include volume loss due to rotten, missing, and form cull defect.

F_VOLCFSND & Q_VOLCFSND = Sound cubic-foot volume. For timber species (trees where the diameter is measured at breast height [DBH]), the volume of sound wood in the central stem of a sample tree >= 5.0 inches DBH, from a 1-foot stump to a minimum 4-inch top diameter. Volume loss due to rotten and missing cull defect has been deleted.

F_DRYBIOT & Q_DRYBIOT = Regional dry total tree biomass. The total aboveground biomass, in pounds, of a sample tree >=1.0 inch DBH/DRC., including all tops and limbs (but excluding foliage).

F_DRYBIOM & Q_DRYBIOM = Regional dry merchantable stem biomass. The total gross biomass, in pounds, in the merchantable stem of a sample tree >=5.0 inches DBH/DRC.



SUPPLEMENTAL FILES (1)

1. \Supplements\Map_study_area.pdf: Portable Document Format file containing a map of the Forest Inventory and Analysis (FIA) plots in the northeastern United States that were visited by both field crews and quality assurance (QA) crews and that included at least one tree, sapling or seedling. In forested areas, there is one FIA plot per approximately 2.400 hectares, with greater sampling intensities in some states and national forests.

Entity_and_Attribute_Detail_Citation:

Burrill, Elizabeth A.; DiTommaso, Andrea M.; Turner, Jeffery A.; Pugh, Scott A.; Christensen, Glenn; Perry, Carol J.; Conkling, Barbara L. 202107. The Forest Inventory and Analysis Database: database description and user guide for phase 2 (version 9.0.1). Washington D.C.: USDA Forest Service. 1026 p. https://www.fia.fs.usda.gov/library/database-documentation

Yanai, Ruth D.; Young, Alexander R.; Campbell, John L.; Westfall, James A.; Barnett, Charles J.; Dillon, Gretchen A.; Green, Mark B.; Woodall, Christopher W. 2022. Measurement uncertainty in a national forest inventory: results from the Northern Region of the USA. Canadian Journal of Forest Research. November 2022. https://doi.org/10.1139/cjfr-2022-0062

Metadata_Reference_Information:

Metadata_Date: 20230126

Metadata_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: State University of New York College of Environmental Science and Forestry

Contact_Person: Ruth D. Yanai

Contact_Position: Professor

Contact_Address:

Address_Type: mailing and physical

Address: 1 Forestry Drive

City: Syracuse

State_or_Province: NY

Postal_Code: 13210

Country: USA

Contact_Electronic_Mail_Address: rdyanai@esf.edu

Metadata_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: USDA Forest Service, Northern Research Station, Forest Inventory and Analysis

Contact_Person: Chuck Bartnett

Contact_Position: Biological Scientist

Contact_Address:

Address_Type: mailing and physical

Address: 271 Mast Road

City: Durham

State_or_Province: NH

Postal_Code: 03824

Country: USA

Contact_Voice_Telephone: 603-868-7620

Contact_Electronic_Mail_Address: charles.barnett@usda.gov

Metadata_Standard_Name: FGDC Biological Data Profile of the Content Standard for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001.1-1999