Details and Metadata
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Methods
The methods followed in the creation of the dataset, including description of field, laboratory and processing steps, and quality control procedures
Current Methods
See FIA Manual in the Documents tab for full details
See FIA Manual in the Documents tab for full details
Plot establishment
Plots to be visited are selected based on stratification of remote sensing interpretation
Plot establishment
Plots to be visited are selected based on stratification of remote sensing interpretation
Plots are designed to cover a 1-acre sample area, though not all trees in the plot are measured. Recent surveys use standard fixed-radius plot, while earlier inventories used mixtures of fixed-radius and variable-radius (prism) plot design
Plots are designed to cover a 1-acre sample area, though not all trees in the plot are measured. Recent surveys use standard fixed-radius plot, while earlier inventories used mixtures of fixed-radius and variable-radius (prism) plot design
Plot locations are 'fuzzed and swapped' to protect privacy and plot integrity in accordance with Federal laws. 'Fuzzed' plots are generally within 0.5 miles of original plot center, and plots where data was 'swapped' are generally similar in nature. See FIA manual for full details
Plot locations are 'fuzzed and swapped' to protect privacy and plot integrity in accordance with Federal laws. 'Fuzzed' plots are generally within 0.5 miles of original plot center, and plots where data was 'swapped' are generally similar in nature. See FIA manual for full details
The standard plot consists of four 24.0-foot radius subplots (approximately 0.0415 or 1/24 acre), on which trees 5.0 inches and greater in diameter are measured. Within each of these subplots is nested a 6.8-foot radius microplot (approximately 1/300th acre) on which trees smaller than 5.0 inches in diameter are measured
The standard plot consists of four 24.0-foot radius subplots (approximately 0.0415 or 1/24 acre), on which trees 5.0 inches and greater in diameter are measured. Within each of these subplots is nested a 6.8-foot radius microplot (approximately 1/300th acre) on which trees smaller than 5.0 inches in diameter are measured
Conditions are defined by changes in land use or changes in vegetation that occur along more-or-less distinct boundaries. Reserved status, owner group, forest type, stand-size class, regeneration status, and stand density are used to define forest conditions. In older plot designs, plot center or subplots locations were rearranged such that the entire plot sampled a single condition, while in the current design, different conditions are “mapped” on the same plot.
Conditions are defined by changes in land use or changes in vegetation that occur along more-or-less distinct boundaries. Reserved status, owner group, forest type, stand-size class, regeneration status, and stand density are used to define forest conditions. In older plot designs, plot center or subplots locations were rearranged such that the entire plot sampled a single condition, while in the current design, different conditions are “mapped” on the same plot.
Field attributes
In addition to attributes that are collected in the field, FIADB includes attributes that are populated in the office. Examples of field attributes include tree diameter and height, and slope and aspect of the plot and subplot. Attributes that are populated in the office include assigned attributes, such as county and owner group codes, or computed attributes, such as tree and area expansion factors, and tree volumes
Field attributes
In addition to attributes that are collected in the field, FIADB includes attributes that are populated in the office. Examples of field attributes include tree diameter and height, and slope and aspect of the plot and subplot. Attributes that are populated in the office include assigned attributes, such as county and owner group codes, or computed attributes, such as tree and area expansion factors, and tree volumes
Standards and guidelines
Forest inventory plans are designed to meet sampling error standards for area, volume, growth, and removals provided in the Forest Service directive (FSH 4809.11) known as the Forest Survey Handbook (U.S. Department of Agriculture 2008). These standards, along with other guidelines, are aimed at obtaining comprehensive and comparable information on timber resources for all parts of the country
Standards and guidelines
Forest inventory plans are designed to meet sampling error standards for area, volume, growth, and removals provided in the Forest Service directive (FSH 4809.11) known as the Forest Survey Handbook (U.S. Department of Agriculture 2008). These standards, along with other guidelines, are aimed at obtaining comprehensive and comparable information on timber resources for all parts of the country
Dataset Fields
Detailed documentation of the fields comprising the dataset, including the type of measurement, units where applicable, and any controlled vocabularies or code lists present in the data
Field Name | Caption | Description | Additional Information |
---|---|---|---|
ADFORCD | ADFORCD | Administrative Forest Code | Measurement type: Nominal |
ADMIN_WITHDRAWN_CD | ADMIN_WITHDRAWN_CD | A PHP Error was encounteredSeverity: 8192 Message: ucwords(): Passing null to parameter #1 ($string) of type string is deprecated Filename: dataset/metadata.php Line Number: 128 | |
AFFORESTATION_CD | AFFORESTATION_CD | A PHP Error was encounteredSeverity: 8192 Message: ucwords(): Passing null to parameter #1 ($string) of type string is deprecated Filename: dataset/metadata.php Line Number: 128 | |
AGE_BASIS_CD_PNWRS | AGE_BASIS_CD_PNWRS | Measurement type: Nominal | |
ALSTK | ALSTK | All-live-tree stocking percent | Measurement type: Ratio Units: |
ALSTKCD | ALSTKCD | All live stocking code | Measurement type: Interval Units: |
ASPECT | ASPECT | ASPECT | Measurement type: Ratio Units: |
BALIVE | BALIVE | Basal area of live trees | Measurement type: Ratio Units: |
CANOPY_CVR_SAMPLE_METHOD_CD | CANOPY_CVR_SAMPLE_METHOD_CD | Canopy cover sample method code | Measurement type: Nominal |
CARBON_DOWN_DEAD | CARBON_DOWN_DEAD | Carbon (tons per acre) of woody material >3 inches in diameter on the ground, and stumps and their roots >3 inches in diameter | Measurement type: Ratio Units: |
CARBON_LITTER | CARBON_LITTER | Carbon (tons per acre) of organic material on the floor of the forest, including fine woody debris, humus, and fine roots in the organic forest floor layer above mineral soil. | Measurement type: Ratio Units: |
CARBON_SOIL_ORG | CARBON_SOIL_ORG | Carbon in organic soil. Carbon (tons per acre) in fine organic material below the soil surface to a depth of 1 meter. Does not include roots. | Measurement type: Ratio Units: |
CARBON_STANDING_DEAD | CARBON_STANDING_DEAD | Carbon in standing dead. Carbon (tons per acre) in standing dead trees 1.0 inch diameter, including coarse roots, is estimated from models based on geographic area, forest type, and (except for nonstocked stands) growing-stock volume (Smith and Heath 2008). | Measurement type: Ratio Units: |
CARBON_UNDERSTORY_AG | CARBON_UNDERSTORY_AG | Carbon in understory aboveground. Carbon (tons per acre) in the above ground portions of seedlings and woody shrubs. | Measurement type: Ratio Units: |
CARBON_UNDERSTORY_BG | CARBON_UNDERSTORY_BG | Carbon in understory belowground. Carbon (tons per acre) in the below ground portions of seedlings and woody shrubs. | Measurement type: Ratio Units: |
CHAINING_CD | CHAINING_CD | A PHP Error was encounteredSeverity: 8192 Message: ucwords(): Passing null to parameter #1 ($string) of type string is deprecated Filename: dataset/metadata.php Line Number: 128 | |
CN | CN | Sequence number | Measurement type: Nominal |
CONDID | CONDID | Condition class number | Measurement type: Nominal |
CONDPROP_UNADJ | CONDPROP_UNADJ | Condition proportion unadjusted | Measurement type: Ratio Units: |
COND_NONSAMPLE_REASN_CD | COND_NONSAMPLE_REASN_CD | Condition nonsampled reason code | Measurement type: Nominal |
COND_STATUS_CD | COND_STATUS_CD | Condition status code. A code indicating the basic land classification. | Measurement type: Nominal |
COND_STATUS_CHNG_CD_RMRS | COND_STATUS_CHNG_CD_RMRS | Measurement type: Nominal | |
COUNTYCD | COUNTYCD | COUNTY CODE | Measurement type: Nominal |
CRCOVPCT_RMRS | CRCOVPCT_RMRS | Measurement type: Nominal | |
CREATED_BY | CREATED_BY | CREATED_BY | Measurement type: Nominal |
CREATED_DATE | CREATED_DATE | CREATED_DATE | Measurement type: DateTime Date/Time Format: MM/DD/YY |
CREATED_IN_INSTANCE | CREATED_IN_INSTANCE | CREATED_IN_INSTANCE | Measurement type: Nominal |
CYCLE | CYCLE | Inventory cycle number | Measurement type: Interval Units: |
DOMINANT_SPECIES1_PNWRS | DOMINANT_SPECIES1_PNWRS | Measurement type: Nominal | |
DOMINANT_SPECIES2_PNWRS | DOMINANT_SPECIES2_PNWRS | Measurement type: Nominal | |
DOMINANT_SPECIES3_PNWRS | DOMINANT_SPECIES3_PNWRS | Measurement type: Nominal | |
DSTRBCD1 | DSTRBCD1 | Disturbance 1 code | Measurement type: Nominal |
DSTRBCD1_P2A | DSTRBCD1_P2A | Measurement type: Nominal | |
DSTRBCD2 | DSTRBCD2 | Disturbance 2 code | Measurement type: Nominal |
DSTRBCD2_P2A | DSTRBCD2_P2A | Measurement type: Nominal | |
DSTRBCD3 | DSTRBCD3 | Disturbance 3 code | Measurement type: Nominal |
DSTRBCD3_P2A | DSTRBCD3_P2A | Measurement type: Nominal | |
DSTRBYR1 | DSTRBYR1 | Disturbance year 1 | Measurement type: Nominal |
DSTRBYR1_P2A | DSTRBYR1_P2A | Measurement type: Nominal | |
DSTRBYR2 | DSTRBYR2 | Disturbance year 2 | Measurement type: Nominal |
DSTRBYR2_P2A | DSTRBYR2_P2A | Measurement type: Nominal | |
DSTRBYR3 | DSTRBYR3 | Disturbance year 3 | Measurement type: Nominal |
DSTRBYR3_P2A | DSTRBYR3_P2A | Measurement type: Nominal | |
DWM_FUELBED_TYPCD | DWM_FUELBED_TYPCD | A PHP Error was encounteredSeverity: 8192 Message: ucwords(): Passing null to parameter #1 ($string) of type string is deprecated Filename: dataset/metadata.php Line Number: 128 | |
FIRE_SRS | FIRE_SRS | Fire, Southern Research Station | Measurement type: Nominal |
FLDAGE | FLDAGE | Field-recorded stand age | Measurement type: Interval Units: |
FLDSZCD | FLDSZCD | Field stand-size class code | Measurement type: Nominal |
FLDTYPCD | FLDTYPCD | Field forest type code | Measurement type: Nominal |
FLDTYPCD_30 | FLDTYPCD_30 | Measurement type: Nominal | |
FOREST_COMMUNITY_PNWRS | FOREST_COMMUNITY_PNWRS | Measurement type: Nominal | |
FORINDCD | FORINDCD | Private owner industrial status code | Measurement type: Nominal |
FORTYPCD | FORTYPCD | Forest type code, derived by algorithm | Measurement type: Nominal |
FORTYPCDCALC | FORTYPCDCALC | Forest type code calculated | Measurement type: Nominal |
GRAZING_SRS | GRAZING_SRS | Grazing, Southern Research Station | Measurement type: Nominal |
GROUND_LAND_CLASS_PNW | GROUND_LAND_CLASS_PNW | Present ground land class, Pacific Northwest Research Station | Measurement type: Nominal |
GSSTK | GSSTK | Growing stock stocking percent | Measurement type: Ratio Units: |
GSSTKCD | GSSTKCD | Growing-stock stocking code | Measurement type: Nominal |
HABTYPCD1 | HABTYPCD1 | Habitat type code 1 | Measurement type: Nominal |
HABTYPCD1_DESCR_PUB_CD | HABTYPCD1_DESCR_PUB_CD | Habitat type code 1 description publication code | Measurement type: Nominal |
HABTYPCD1_PUB_CD | HABTYPCD1_PUB_CD | Habitat type code 1 publication code | Measurement type: Nominal |
HABTYPCD2 | HABTYPCD2 | Habitat type code 2 | Measurement type: Nominal |
HABTYPCD2_DESCR_PUB_CD | HABTYPCD2_DESCR_PUB_CD | A PHP Error was encounteredSeverity: 8192 Message: ucwords(): Passing null to parameter #1 ($string) of type string is deprecated Filename: dataset/metadata.php Line Number: 128 | |
HABTYPCD2_PUB_CD | HABTYPCD2_PUB_CD | Habitat type code 2 publication code | Measurement type: Nominal |
HARVEST_TYPE1_SRS | HARVEST_TYPE1_SRS | Harvest type code 1, Southern Research Station | Measurement type: Nominal |
HARVEST_TYPE2_SRS | HARVEST_TYPE2_SRS | Harvest type code 2, Southern Research Station | Measurement type: Nominal |
HARVEST_TYPE3_SRS | HARVEST_TYPE3_SRS | Harvest type code 3, Southern Research Station | Measurement type: Nominal |
INDUSTRIALCD_FIADB | INDUSTRIALCD_FIADB | Measurement type: Nominal | |
INVYR | INVYR | Inventory year | Measurement type: DateTime Date/Time Format: YYYY |
LAND_COVER_CLASS_CD | LAND_COVER_CLASS_CD | A PHP Error was encounteredSeverity: 8192 Message: ucwords(): Passing null to parameter #1 ($string) of type string is deprecated Filename: dataset/metadata.php Line Number: 128 | |
LAND_COVER_CLASS_CD_RET | LAND_COVER_CLASS_CD_RET | Measurement type: Nominal | |
LAND_USECD_RMRS | LAND_USECD_RMRS | Measurement type: Nominal | |
LAND_USE_SRS | LAND_USE_SRS | Land use, Southern Research Station | Measurement type: Nominal |
LIVE_CANOPY_CVR_PCT | LIVE_CANOPY_CVR_PCT | Live canopy cover percent | Measurement type: Ratio Units: |
LIVE_MISSING_CANOPY_CVR_PCT | LIVE_MISSING_CANOPY_CVR_PCT | Live plus missing canopy cover percent | Measurement type: Ratio Units: |
MACRPROP_UNADJ | MACRPROP_UNADJ | Macroplot proportion unadjusted | Measurement type: Ratio Units: |
MAICF_RMRS | MAICF_RMRS | Measurement type: Nominal | |
MAPDEN | MAPDEN | Mapping density | Measurement type: Nominal |
MICRPROP_UNADJ | MICRPROP_UNADJ | Microplot proportion unadjusted | Measurement type: Ratio Units: |
MIXEDCONFCD | MIXEDCONFCD | Mixed conifer code | Measurement type: Nominal |
MODIFIED_BY | MODIFIED_BY | MODIFIED BY | Measurement type: Nominal |
MODIFIED_DATE | MODIFIED_DATE | MODIFIED DATE | Measurement type: DateTime Date/Time Format: MM/DD/YYYY |
MODIFIED_IN_INSTANCE | MODIFIED_IN_INSTANCE | MODIFIED_IN_INSTANCE | Measurement type: Nominal |
NBR_LIVE_STEMS | NBR_LIVE_STEMS | Number of live stems | Measurement type: Interval Units: |
NF_COND_NONSAMPLE_REASN_CD | NF_COND_NONSAMPLE_REASN_CD | Nonforest condition nonsampled reason code | Measurement type: Nominal |
NF_COND_STATUS_CD | NF_COND_STATUS_CD | Nonforest condition status code | Measurement type: Nominal |
NVCS_LEVEL_1_CD | NVCS_LEVEL_1_CD | Measurement type: Nominal | |
NVCS_LEVEL_2_CD | NVCS_LEVEL_2_CD | Measurement type: Nominal | |
NVCS_LEVEL_3_CD | NVCS_LEVEL_3_CD | Measurement type: Nominal | |
NVCS_LEVEL_4_CD | NVCS_LEVEL_4_CD | Measurement type: Nominal | |
NVCS_LEVEL_5_CD | NVCS_LEVEL_5_CD | Measurement type: Nominal | |
NVCS_LEVEL_6_CD | NVCS_LEVEL_6_CD | Measurement type: Nominal | |
NVCS_LEVEL_7_CD | NVCS_LEVEL_7_CD | Measurement type: Nominal | |
NVCS_LEVEL_8_CD | NVCS_LEVEL_8_CD | Measurement type: Nominal | |
NVCS_PRIMARY_CLASS | NVCS_PRIMARY_CLASS | Measurement type: Nominal | |
OPERABILITY_SRS | OPERABILITY_SRS | Operability, Southern Research Station | Measurement type: Nominal |
OWNCD | OWNCD | Owner class code | Measurement type: Nominal |
OWNGRPCD | OWNGRPCD | Owner group code | Measurement type: Nominal |
OWNSUBCD | OWNSUBCD | A PHP Error was encounteredSeverity: 8192 Message: ucwords(): Passing null to parameter #1 ($string) of type string is deprecated Filename: dataset/metadata.php Line Number: 128 | |
PCTBARE_RMRS | PCTBARE_RMRS | Measurement type: Nominal | |
PHYSCLCD | PHYSCLCD | Physiographic class code | Measurement type: Nominal |
PLANT_STOCKABILITY_FACTOR_PNW | PLANT_STOCKABILITY_FACTOR_PNW | Plant stockability factor, Pacific Northwest Research Station | Measurement type: Ratio Units: |
PLOT | PLOT | PLOT | Measurement type: Nominal |
PLT_CN | PLT_CN | Plot sequence number | Measurement type: Nominal |
PRESNFCD | PRESNFCD | Present nonforest code | Measurement type: Nominal |
PREV_AFFORESTATION_CD | PREV_AFFORESTATION_CD | A PHP Error was encounteredSeverity: 8192 Message: ucwords(): Passing null to parameter #1 ($string) of type string is deprecated Filename: dataset/metadata.php Line Number: 128 | |
PROP_BASIS | PROP_BASIS | Proportion basis | Measurement type: Nominal |
QMD_RMRS | QMD_RMRS | Measurement type: Nominal | |
RANGETYPCD_RMRS | RANGETYPCD_RMRS | Measurement type: Nominal | |
RESERVCD | RESERVCD | Reserved status code | Measurement type: Nominal |
RESERVCD_5 | RESERVCD_5 | Measurement type: Nominal | |
SDIMAX_RMRS | SDIMAX_RMRS | Measurement type: Nominal | |
SDIPCT_RMRS | SDIPCT_RMRS | Measurement type: Nominal | |
SDI_RMRS | SDI_RMRS | Measurement type: Nominal | |
SIBASE | SIBASE | Site index base age | Measurement type: Nominal |
SIBASE_FVS | SIBASE_FVS | Measurement type: Nominal | |
SICOND | SICOND | Site index for the condition | Measurement type: Nominal |
SICOND_FVS | SICOND_FVS | Measurement type: Nominal | |
SIEQN_REF_CD | SIEQN_REF_CD | Measurement type: Nominal | |
SIEQN_REF_CD_FVS | SIEQN_REF_CD_FVS | Measurement type: Nominal | |
SISP | SISP | Site index species code | Measurement type: Nominal |
SISP_FVS | SISP_FVS | Measurement type: Nominal | |
SITECLCD | SITECLCD | Site productivity class code | Measurement type: Nominal |
SITECLCDEST | SITECLCDEST | Site productivity class code estimated | Measurement type: Interval Units: |
SITECL_METHOD | SITECL_METHOD | Site class method | Measurement type: Nominal |
SITETREE_TREE | SITETREE_TREE | Site tree tree number | Measurement type: Nominal |
SLOPE | SLOPE | Slope | Measurement type: Nominal |
SOIL_ROOTING_DEPTH_PNW | SOIL_ROOTING_DEPTH_PNW | Soil rooting depth, Pacific Northwest Research Station | Measurement type: Nominal |
STAND_STRUCTURE_ME_NERS | STAND_STRUCTURE_ME_NERS | Measurement type: Nominal | |
STAND_STRUCTURE_SRS | STAND_STRUCTURE_SRS | Stand structure, Southern Research Station | Measurement type: Nominal |
STATECD | STATECD | State code | Measurement type: Interval Units: |
STDAGE | STDAGE | Stand age | Measurement type: Interval Units: |
STDORGCD | STDORGCD | Stand origin code | Measurement type: Nominal |
STDORGSP | STDORGSP | Stand origin species code | Measurement type: Nominal |
STDSZCD | STDSZCD | Stand-size class code derived by algorithm | Measurement type: Interval Units: |
STND_COND_CD_PNWRS | STND_COND_CD_PNWRS | Stand condition code, Pacific Northwest Research Station | Measurement type: Nominal |
STND_STRUC_CD_PNWRS | STND_STRUC_CD_PNWRS | Stand structure code, Pacific Northwest Research Station | Measurement type: Nominal |
STUMP_CD_PNWRS | STUMP_CD_PNWRS | Stump code, Pacific Northwest Research Station | Measurement type: Nominal |
SUBCYCLE | SUBCYCLE | Inventory subcycle number | Measurement type: Nominal |
SUBPPROP_UNADJ | SUBPPROP_UNADJ | Subplot proportion unadjusted | Measurement type: Ratio Units: |
TREES_PRESENT_NCRS | TREES_PRESENT_NCRS | Measurement type: Nominal | |
TREES_PRESENT_NERS | TREES_PRESENT_NERS | Measurement type: Nominal | |
TRTCD1 | TRTCD1 | Stand treatment 1 code | Measurement type: Nominal |
TRTCD1_P2A | TRTCD1_P2A | Measurement type: Nominal | |
TRTCD2 | TRTCD2 | Stand treatment 2 code | Measurement type: Nominal |
TRTCD2_P2A | TRTCD2_P2A | Measurement type: Nominal | |
TRTCD3 | TRTCD3 | Stand treatment 3 code | Measurement type: Nominal |
TRTCD3_P2A | TRTCD3_P2A | Measurement type: Nominal | |
TRTOPCD | TRTOPCD | Measurement type: Nominal | |
TRTYR1 | TRTYR1 | Treatment year 1 | Measurement type: DateTime Date/Time Format: YYYY |
TRTYR1_P2A | TRTYR1_P2A | Measurement type: Nominal | |
TRTYR2 | TRTYR2 | Treatment year 2 | Measurement type: DateTime Date/Time Format: YYYY |
TRTYR2_P2A | TRTYR2_P2A | Measurement type: Nominal | |
TRTYR3 | TRTYR3 | Treatment year 3 | Measurement type: DateTime Date/Time Format: YYYY |
TRTYR3_P2A | TRTYR3_P2A | Measurement type: Nominal | |
UNITCD | UNITCD | Survey unit code | Measurement type: Nominal |
VOL_LOC_GRP | VOL_LOC_GRP | Volume location group | Measurement type: Nominal |
Sampling Equipment
Equipment and software used to collect data, including how that equipment was used.
No sampling equipment recorded for this dataset
Site Characteristics
The spatial extent of the dataset site coverage, and descriptions of the spatial extent and context for the data collection
No site characteristics recorded for this dataset