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TV056 – Simplified metadata
Dataset
- Database Code
- TV056
- Title
- Comparisons among five canopy-cover estimating methods in five Douglas-fir/western hemlock structure types in the western Oregon Cascades
- Abstract
- Estimates of forest canopy cover are widely used in forest research and management, yet methods used to quantify canopy cover and the estimates they provide vary greatly. Four ground-based techniques for estimating overstory cover -line- intercept, spherical densiometer, moosehorn, and hemispherical photography-and cover estimates generated using the Forest Vegetation Simulator (FVS) were compared in five Douglas- fir/western hemlock structure types in western Oregon. Differences in cover estimates among the ground-based methods did not depend on the structure type in which they were measured (p=0.33). As expected, estimates of cover increased and within-stand variability decreased with increasing angle of view among techniques. However, the moosehorn provided the most conservative estimates of vertical-projection overstory cover. The FVS-generated cover was consistently lower (by up to 44%, 17% on average) than the ground-based estimates and is not advised as a substitute for ground-based measures in these forest types. Regression equations are provided to allow conversion among canopy cover estimates developed with the four ground-based methods.
- Keywords
- community structure; populations; photo point imagery; canopies; populations
- Date begin
- 2001-06-26
- Date end
- 2001-09-09
- Principal Investigator
- Anne C.S. Fiala McIntosh
Entities
- TV05601
- TV05602
- TV05603
- TV05604
- TV05605
- TV05606
1. TV05601 - Attribute list
| Attribute | Type | Domain | Minimum | Maximum | Unit |
|---|---|---|---|---|---|
| DBCODE | varchar | enum | |||
| ENTITY | numeric(1) | range | 1.0000 | 1.0000 | number |
| PLOT | varchar | enum | |||
| TYPE | varchar | enum | |||
| MOOSECOVER | numeric(1) | range | 0.0000 | 100.0000 | percent |
| DENSIOMETERCOVER | numeric(1) | range | 0.0000 | 100.0000 | percent |
| FISHEYECOVER | numeric(1) | range | 0.0000 | 100.0000 | percent |
| LICOVER | numeric(1) | range | 0.0000 | 100.0000 | percent |
| FVSCOVER | numeric(1) | range | 0.0000 | 100.0000 | percent |
| MOOSESE | numeric(1) | range | 0.0000 | 100.0000 | number |
| DENSIOMSE | numeric(1) | range | 0.0000 | 100.0000 | number |
| FEYESE | numeric(1) | range | 0.0000 | 100.0000 | number |
| LISE | numeric(1) | range | 0.0000 | 100.0000 | number |
2. TV05602 - Attribute list
| Attribute | Type | Domain | Minimum | Maximum | Unit |
|---|---|---|---|---|---|
| DBCODE | varchar | enum | |||
| ENTITY | numeric(1) | range | 2.0000 | 2.0000 | number |
| PLOT | varchar | enum | |||
| SUBPLOT | varchar | freetext | |||
| TRANSECT | varchar | enum | |||
| DISTANCE | numeric(1) | range | 0.0000 | 29.0000 | meters |
| NORTH | numeric(1) | range | 0.0000 | 17.0000 | number |
| EAST | numeric(1) | range | 0.0000 | 17.0000 | number |
| SOUTH | numeric(1) | range | 0.0000 | 17.0000 | number |
| WEST | numeric(1) | range | 0.0000 | 17.0000 | number |
| TOTAL_COUNT | numeric(1) | range | 0.0000 | 68.0000 | number |
3. TV05603 - Attribute list
| Attribute | Type | Domain | Minimum | Maximum | Unit |
|---|---|---|---|---|---|
| DBCODE | varchar | enum | |||
| ENTITY | numeric(1) | range | 3.0000 | 3.0000 | number |
| PLOT | varchar | enum | |||
| SUBPLOT | varchar | freetext | |||
| ISF | numeric(1) | range | 0.0000 | 0.5000 | number |
| FECOVER | numeric(1) | range | 51.0000 | 100.0000 | percent |
4. TV05604 - Attribute list
| Attribute | Type | Domain | Minimum | Maximum | Unit |
|---|---|---|---|---|---|
| DBCODE | varchar | enum | |||
| ENTITY | numeric(1) | range | 4.0000 | 4.0000 | number |
| PLOT | varchar | enum | |||
| SUBPLOT | varchar | freetext | |||
| TRANSECT | varchar | enum | |||
| SPECIES | varchar | enum | |||
| LAYER | varchar | enum | |||
| STARTDIST | numeric(1) | range | 0.0000 | 22.8000 | decimeters |
| ENDDIST | numeric(1) | range | 0.0000 | 24.0000 | decimeters |
5. TV05605 - Attribute list
| Attribute | Type | Domain | Minimum | Maximum | Unit |
|---|---|---|---|---|---|
| DBCODE | varchar | enum | |||
| ENTITY | numeric(1) | range | 5.0000 | 5.0000 | number |
| PLOT | varchar | enum | |||
| SUBPLOT | varchar | freetext | |||
| TRANSECT | varchar | enum | |||
| DISTANCE | numeric(1) | range | 0.0000 | 24.0000 | meters |
| COUNT | numeric(1) | range | 0.0000 | 36.0000 | number |
6. TV05606 - Attribute list
| Attribute | Type | Domain | Minimum | Maximum | Unit |
|---|---|---|---|---|---|
| DBCODE | varchar | enum | |||
| ENTITY | numeric(1) | range | 6.0000 | 6.0000 | number |
| PLOT | varchar | enum | |||
| SUBPLOT | varchar | freetext | |||
| UTM_EASTING | numeric(1) | range | 0.0000 | 10569161.0000 | meters |
| UTM_NORTHING | numeric(1) | range | 0.0000 | 5033837.0000 | meters |
| TRANSECT1 | numeric(1) | range | 0.0000 | 100.0000 | percent |
| TRANSECT2 | numeric(1) | range | 0.0000 | 100.0000 | percent |
| TRANSECT3 | numeric(1) | range | 0.0000 | 100.0000 | percent |
| DATE | datetime | freetext | |||
| BAHA | numeric(1) | range | 19.0000 | 174.0000 | square meters per hectare |
| COMMENTS | varchar | freetext |
Attribute definitions
- BAHA
- the basal area of the stand
- COMMENTS
- General comments on a given stand
- COUNT
- The number of cross-hair intersections NOT intercepted by cover (maximum=36)
- DATE
- The date the stand was surveyed.
- DBCODE
- Database Code
- DENSIOMETERCOVER
- Mean stand-level cover using densiometer
- DENSIOMSE
- Within-stand standard error of densiometer measurements
- DISTANCE
- The slope UN-corrected distance along the transect where the measurement was taken.
- EAST
- The number of points NOT intersected by cover (maximum of 17) in the 17-point pie shaped area of the densiometer when facing in east direction (See Strickler 1959).
- ENDDIST
- The slope-uncorrected distance at which the crown of a tree species last intercepted a line transect
- ENTITY
- Entity Number
- FECOVER
- The cover estimated from the analysis of a fisheye photo for one of the photo-points in a given subplot
- FEYESE
- Within-stand standard error of fisheye measurements
- FISHEYECOVER
- Mean stand-level cover using hemispherical photography
- FVSCOVER
- Mean stand-level cover using FVS Region 6 Variant equations
- ISF
- The indirect site factor calculated using Canopy analysis program (Rich 1989)
- LAYER
- The layer in which cover data were recorded, maximum of three layers, with layer 1 the tallest layer and layer 3 the shortest.
- LICOVER
- Mean stand-level cover using line-intercept data
- LISE
- Within-stand standard error of line-intercept measurements
- MOOSECOVER
- Mean stand-level cover using moosehorn method
- MOOSESE
- Within-stand standard error of moosehorn measurements
- NORTH
- The number of points NOT intersected by cover (maximum of 17) in the 17-point pie shaped area of the densiometer when facing in north direction (See Strickler 1959).
- PLOT
- Identifier for stand where data were collected.
- SOUTH
- The number of points NOT intersected by cover (maximum of 17) in the 17-point pie shaped area of the densiometer when facing in south direction (See Strickler 1959).
- SPECIES
- Tree or shrub species that intercepted a line transect
- STARTDIST
- The slope-uncorrected distance at which a crown first intercepted a line transect (* this may be reversed, so distance intercepted by crown is the absolute difference between startdist and enddist.)
- SUBPLOT
- Identifier for the subplot in which data were collected, 5 subplots total per stand
- TOTAL_COUNT
- The sum of points from all four cardinal directions NOT intersected by cover
- TRANSECT
- The transect along which the information was collected
- TRANSECT1
- The slope of the transect that moves outwards at azimuth 0 degrees (North)
- TRANSECT2
- The slope of the transect that moves outwards at azimuth 120 degrees
- TRANSECT3
- The slope of the transect that moves outwards at azimuth 240 degrees
- TYPE
- Forest structure group that the stand belongs to
- UTM_EASTING
- UTM Easting coordinate
- UTM_NORTHING
- UTM Northing coordinate
- WEST
- The number of points NOT intersected by cover (maximum of 17) in the 17-point pie shaped area of the densiometer when facing in west direction (See Strickler 1959).
Enumerated domains
Enumerated domain for attribute: DBCODE
| Code | Description |
|---|---|
| TV056 | FSDB Database Code |
Enumerated domain for attribute: PLOT
| Code | Description |
|---|---|
| 1080116 | Eight digit number is the plot identifier for the code for the USDA Forest Service Current Vegetation Survey plot that was used in the study |
| 1086120 | Eight digit number is the plot identifier for the code for the USDA Forest Service Current Vegetation Survey plot that was used in the study |
| 1096136 | Eight digit number is the plot identifier for the code for the USDA Forest Service Current Vegetation Survey plot that was used in the study |
| 1096144 | Eight digit number is the plot identifier for the code for the USDA Forest Service Current Vegetation Survey plot that was used in the study |
| 1110156 | Eight digit number is the plot identifier for the code for the USDA Forest Service Current Vegetation Survey plot that was used in the study |
| 2079120 | Eight digit number is the plot identifier for the code for the USDA Forest Service Current Vegetation Survey plot that was used in the study |
| 2080122 | Eight digit number is the plot identifier for the code for the USDA Forest Service Current Vegetation Survey plot that was used in the study |
| 2084138 | Eight digit number is the plot identifier for the code for the USDA Forest Service Current Vegetation Survey plot that was used in the study |
| 2085152 | Eight digit number is the plot identifier for the code for the USDA Forest Service Current Vegetation Survey plot that was used in the study |
| 2087136 | Eight digit number is the plot identifier for the code for the USDA Forest Service Current Vegetation Survey plot that was used in the study |
| 2097140 | Eight digit number is the plot identifier for the code for the USDA Forest Service Current Vegetation Survey plot that was used in the study |
| 2098146 | Eight digit number is the plot identifier for the code for the USDA Forest Service Current Vegetation Survey plot that was used in the study |
| 2099144 | Eight digit number is the plot identifier for the code for the USDA Forest Service Current Vegetation Survey plot that was used in the study |
| 2102154 | Eight digit number is the plot identifier for the code for the USDA Forest Service Current Vegetation Survey plot that was used in the study |
| 2105140 | Eight digit number is the plot identifier for the code for the USDA Forest Service Current Vegetation Survey plot that was used in the study |
| 2129156 | Eight digit number is the plot identifier for the code for the USDA Forest Service Current Vegetation Survey plot that was used in the study |
| 2135146 | Eight digit number is the plot identifier for the code for the USDA Forest Service Current Vegetation Survey plot that was used in the study |
| 2146186 | Eight digit number is the plot identifier for the code for the USDA Forest Service Current Vegetation Survey plot that was used in the study |
| RS1 | Plot identifier for Permanent Sample plots used in this study. |
| RS2 | Plot identifier for Permanent Sample plots used in this study. |
| RS20 | Plot identifier for Permanent Sample plots used in this study. |
| RS21 | Plot identifier for Permanent Sample plots used in this study. |
| RS26 | Plot identifier for Permanent Sample plots used in this study. |
| RS28 | Plot identifier for Permanent Sample plots used in this study. |
| RS29 | Plot identifier for Permanent Sample plots used in this study. |
| RS3 | Plot identifier for Permanent Sample plots used in this study. |
| RS30 | Plot identifier for Permanent Sample plots used in this study. |
| RS35 | Plot identifier for Permanent Sample plots used in this study. |
| TAC1 | Plot identifier for Young Stand Thinning and Diversity stands used in this study. |
| TAC10 | Plot identifier for Young Stand Thinning and Diversity stands used in this study. |
| TAC11 | Plot identifier for Young Stand Thinning and Diversity stands used in this study. |
| TAC13 | Plot identifier for Young Stand Thinning and Diversity stands used in this study. |
| TAC14 | Plot identifier for Young Stand Thinning and Diversity stands used in this study. |
| TAC15 | Plot identifier for Young Stand Thinning and Diversity stands used in this study. |
| TAC2 | Plot identifier for Young Stand Thinning and Diversity stands used in this study. |
| TAC3 | Plot identifier for Young Stand Thinning and Diversity stands used in this study. |
| TAC5 | Plot identifier for Young Stand Thinning and Diversity stands used in this study. |
| TAC6 | Plot identifier for Young Stand Thinning and Diversity stands used in this study. |
| TAC7 | Plot identifier for Young Stand Thinning and Diversity stands used in this study. |
| TAC9 | Plot identifier for Young Stand Thinning and Diversity stands used in this study. |
| UA1 | Plot identifier for HJA Unevenaged Management Project stands used in this study. |
| UA11 | Plot identifier for HJA Unevenaged Management Project stands used in this study. |
| UA12 | Plot identifier for HJA Unevenaged Management Project stands used in this study. |
| UA13 | Plot identifier for HJA Unevenaged Management Project stands used in this study. |
| UA15 | Plot identifier for HJA Unevenaged Management Project stands used in this study. |
| UA16 | Plot identifier for HJA Unevenaged Management Project stands used in this study. |
| UA3 | Plot identifier for HJA Unevenaged Management Project stands used in this study. |
| UA4 | Plot identifier for HJA Unevenaged Management Project stands used in this study. |
| UA5 | Plot identifier for HJA Unevenaged Management Project stands used in this study. |
| UA7 | Plot identifier for HJA Unevenaged Management Project stands used in this study. |
| UA8 | Plot identifier for HJA Unevenaged Management Project stands used in this study. |
| UA9 | Plot identifier for HJA Unevenaged Management Project stands used in this study. |
Enumerated domain for attribute: TYPE
| Code | Description |
|---|---|
| Mature | Mature structure group (120-180 years) |
| OG | Old-growth structure group (>250 years) |
| control | Young unthinned structure group |
| heavy | Young heavy-thin structure group |
| light | Young light-thin structure group |
Enumerated domain for attribute: TRANSECT
| Code | Description |
|---|---|
| Measurement takes place at the center of the subplot (where the three transects converge) | |
| 1 | Transect that faces directly north, azimuth: 0 degrees. |
| 2 | Transect that faces at an azimuth of 120 degrees |
| 3 | Transect that travels out at an azimuth of 240 degrees. |
Enumerated domain for attribute: SPECIES
| Code | Description |
|---|---|
| ABIES | Abies |
| ABAM | Abies amabilis |
| ABGR | Abies grandis |
| ACCI | Acer circinatum |
| ACMA | Acer macrophyllum |
| ALRU | Alnus rubra |
| AMELA | Amelanchier |
| ARME | Arbutus menziesii |
| ARCTO3 | Arctostaphylos |
| CONU | Cornus nuttallii |
| COCO | Cotula coronopifolia |
| GASH | Gaultheria shallon |
| HODI | Holodiscus discolor |
| ILIAM | Iliamna |
| LAOC | Larix occidentalis |
| PINUS | Pinus |
| POTR | Populus tremuloides |
| PREM | Prunus emarginata |
| PSME | Pseudotsuga menziesii |
| QUERC | Quercus |
| RHPU | Rhamnus purshiana |
| RHMA | Rhododendron macrophyllum |
| SALIX | Salix |
| SAMBU | Sambucus |
| SYMPH | Symphoricarpos |
| TABR | Taxus brevifolia |
| THPL | Thuja plicata |
| TSHE | Tsuga heterophylla |
| TSME | Tsuga mertensiana |
| VACCI | Vaccinium |
| CACH | Castanopsis chrysophylla |
Enumerated domain for attribute: LAYER
| Code | Description |
|---|---|
| There were no trees intercepting the given line-transect | |
| 1 | Layer 1 is the uppermost layer of trees, with it being >= 5 m taller than the next tallest layer Layer 2) |
| 2 | Layer 2 is the middle layer of trees, with it being >=5m shorter than the uppermost layer (1) and >-5 m taller than a lower cohort of trees |
| 3 | Layer 3 is the lowermost layer of trees (using max of 3 layers as the set criteria), with it being at least 5 m mean height shorter than layer 2. |