Aspen Stands - Warner Mountain [ds112]

File Geodatabase Feature Class

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Tags
Aspen, Populus tremuloides, vegetation structure, stand size, distribution, trend, California, Modoc, Warner Mountains, location


Summary

The purpose of the project was twofold: 1) To detect changes in the amount and distribution of aspen within the study area in the South Warner Mountains over a 48 year duration using aerial photograph interpretation. 2) To collect field data on the current condition of aspen stands, and their use by wildlife.

Description

This dataset displays aspen stands in the Warner Mountains south of State Highway 299. The 1946 and 1994 data are presented as polygons depicting aspen stands derived from aerial photos taken in 1946 and 1994, respectively, while the 2002 data includes the aspen stand delineations and their corresponding vegetation data (i.e., size distribution of aspen, the canopy and shrub cover, the number of species of grasses and forbs, and the ratio of conifers to aspens). The polygons ranged in size from less than 0.2 acres to more than 1,130 acres. There are 2103 records, one for each aspen stand mapped and sampled. All data were collected and summarized by Aaron Di Orio, California Department of Fish and Wildlife. This is one of three data sets for a study investigating change in the size of aspen stands since 1946. Other available data sets are 1946 and 1994 aerial photo mosaics.

Credits

The 2002 data were collected and summarized by Aaron Di Orio, California Department of Fish and Wildlife, Region 1. The 1946 and 1994 data were collected and compiled by Jason Schwenkler, Geographical Information Center, Chico, CA - schwenkler@gic.csuchico.edu

Use limitations

License: This work is licensed under Creative Commons Attribution 4.0 International License ( https://creativecommons.org/licenses/by/4.0/ ). Using the citation standards recommended for BIOS datasets ( https://www.wildlife.ca.gov/Data/BIOS/Citing-BIOS ) satisfies the attribution requirements of this license.

Disclaimer: The State makes no claims, promises, or guarantees about the accuracy, completeness, reliability, or adequacy of these data and expressly disclaims liability for errors and omissions in these data. No warranty of any kind, implied, expressed, or statutory, including but not limited to the warranties of non-infringement of third party rights, title, merchantability, fitness for a particular purpose, and freedom from computer virus, is given with respect to these data.

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Extent

West -120.334784 East -120.098094
North 41.521078 South 41.071003

Scale Range
Maximum (zoomed in) 1:5,000
Minimum (zoomed out) 1:150,000,000

ArcGIS Metadata

Topics and Keywords

Themes or categories of the resource location


Content type Downloadable Data
Export to FGDC CSDGM XML format as Resource Description No

Place keywords California, Modoc, Warner Mountains

Theme keywords Aspen, Populus tremuloides, vegetation structure, stand size, distribution, trend

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Citation

Title Aspen Stands - Warner Mountain [ds112]
Publication date 2004-08-0100:00:00


Presentation formats digital map
FGDC geospatial presentation format vector digital data


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Citation Contacts

Responsible party
Organization's name The 2002 data were developed by Aaron Di Orio, California Department of Fish and Game, Region 1.
Contact's role originator


Responsible party
Organization's name The 1946 and 1994 data were developed by: Jason Schwenkler, Geographical Information Center, Chico, CA - schwenkler@gic.csuchico.edu
Contact's role originator


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Resource Details

Dataset languages English(UNITED STATES)
Dataset character set utf8 - 8 bit UCS Transfer Format


Status completed
Spatial representation type vector


Supplemental information
METHODS: An initial visit to the project area was taken where field studies in aspen stands were being conducted. Discussion was held on mapping aspen stand perimeters, associated vegetation, and other field techniques with field crew members. The 1946 photographs, with some preliminary aspen stands mapped, were also looked at in the field. GPS points and perimeters were obtained from the field study efforts to use for reference purposes in the historic aspen mapping. ArcView 3.X was used to create the aspen layer using heads-up digitizing from stereo pair ortho photographs. Visual identification, stereoscopes, and the GPS points and perimeters were all used to find and identify aspen polygons. In general, individual aspen stands were visually identified by differences in color and texture on the black and white aerial photographs. In areas where shadows appear, aspen is mixed with conifers, or immature trees that may be confused with shrubs, the stereoscope and reference GPS points and perimeters were used to help determine if stands were aspen or other species. A code system was developed to reference certainty of identification. A rating system of 1 to 3 was used with 1 being certain, 2 fairly sure and 3 being questionable and with a possible conifer content (see 'comment' field). Stands where a 2 or 3 certainty code was used may be candidates for future field checks. In transition areas, a polygon line is drawn to confine the aspen and exclude the mixed conifer-aspen. For the 2002 data, all vegetation and pellet data for each stand were obtained by measuring these characteristics in 10m by 10m plots, with the number of plots (1 to 6) dependent on the size of the stand being surveyed. The values of the variables in this data set are intended to represent the entire stand by averaging the values obtained from all the sample plots within each stand. A Trimble GeoExplorer III GPS receiver was used to determine the extent of the aspen stands. Coordinates were originally measured in UTM NAD27.
Processing environment Microsoft Windows Vista Version 6.1 (Build 7601) Service Pack 1; ESRI ArcCatalog 9.3.1.4095


Credits
The 2002 data were collected and summarized by Aaron Di Orio, California Department of Fish and Wildlife, Region 1. The 1946 and 1994 data were collected and compiled by Jason Schwenkler, Geographical Information Center, Chico, CA - schwenkler@gic.csuchico.edu
ArcGIS item properties
* Name ds112
* Size 7.365
* Location file://\\geodata.\bios\WorkArea\BIOSOnline\Refresh\TODOData\BIOSOnlineData.gdb
* Access protocol Local Area Network

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Extents

Extent
Geographic extent
Bounding rectangle
West longitude -120.334784
East longitude -120.098094
North latitude 41.521078
South latitude 41.071003
Extent contains the resource Yes

Extent
Description
ground condition
Extent
Geographic extent
Bounding rectangle
Extent type Extent used for searching
* West longitude -120.334784
* East longitude -120.098094
* North latitude 41.521078
* South latitude 41.071003
* Extent contains the resource Yes

Extent in the item's coordinate system
* West longitude -27978.783552
* East longitude -8249.599662
* South latitude 339430.740975
* North latitude 389324.349597
* Extent contains the resource Yes

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Resource Points of Contact

Point of contact
Individual's name Aaron Di Orio
Organization's name California Department of Fish and Wildlife, Region 1
Contact's role point of contact


Contact information
Phone
Voice 530-340-3913

Address
Type physical
Delivery point Shasta Valley Wildlife Area
Delivery point 1724 Ball Mountain Road
City Montague
Administrative area CA
Postal code 96064
Country US
e-mail address adiorio@dfg.ca.gov

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Resource Maintenance

Resource maintenance
Update frequency not planned


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Resource Constraints

Constraints
Limitations of use

License: This work is licensed under Creative Commons Attribution 4.0 International License ( https://creativecommons.org/licenses/by/4.0/ ). Using the citation standards recommended for BIOS datasets ( https://www.wildlife.ca.gov/Data/BIOS/Citing-BIOS ) satisfies the attribution requirements of this license.

Disclaimer: The State makes no claims, promises, or guarantees about the accuracy, completeness, reliability, or adequacy of these data and expressly disclaims liability for errors and omissions in these data. No warranty of any kind, implied, expressed, or statutory, including but not limited to the warranties of non-infringement of third party rights, title, merchantability, fitness for a particular purpose, and freedom from computer virus, is given with respect to these data.

Check with Contact person for use constraints.


Legal constraints
Access constraints other restrictions


Other constraints
Department of Fish and Game use only.
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Spatial Reference

ArcGIS coordinate system
* Type Projected
* Geographic coordinate reference GCS_North_American_1983
* Projection NAD_1983_California_Teale_Albers
* Coordinate reference details
Projected coordinate system
Well-known identifier 3310
X origin -16909700
Y origin -8597000
XY scale 10000
Z origin -100000
Z scale 10000
M origin -100000
M scale 10000
XY tolerance 0.001
Z tolerance 0.001
M tolerance 0.001
High precision true
Latest well-known identifier 3310
Well-known text PROJCS["NAD_1983_California_Teale_Albers",GEOGCS["GCS_North_American_1983",DATUM["D_North_American_1983",SPHEROID["GRS_1980",6378137.0,298.257222101]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Albers"],PARAMETER["False_Easting",0.0],PARAMETER["False_Northing",-4000000.0],PARAMETER["Central_Meridian",-120.0],PARAMETER["Standard_Parallel_1",34.0],PARAMETER["Standard_Parallel_2",40.5],PARAMETER["Latitude_Of_Origin",0.0],UNIT["Meter",1.0],AUTHORITY["EPSG",3310]]

Reference system identifier
* Value 3310
* Codespace EPSG
* Version 6.8(9.2.0)


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Spatial Data Properties

Vector
* Level of topology for this dataset geometry only


Geometric objects
Feature class name ds112
* Object type composite
* Object count 0

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ArcGIS Feature Class Properties
Feature class name ds112
* Feature type Simple
* Geometry type Polygon
* Has topology FALSE
* Feature count 0
* Spatial index TRUE
* Linear referencing FALSE

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Geoprocessing history

Process
Date 2021-08-1313:07:01
Tool location c:\program files\arcgis\pro\Resources\ArcToolbox\toolboxes\Conversion Tools.tbx\FeatureClassToFeatureClass
Command issued
Include in lineage when exporting metadata No


Process
Date 2021-08-1313:07:07
Tool location c:\program files\arcgis\pro\Resources\ArcToolbox\toolboxes\Data Management Tools.tbx\Project
Command issued
Include in lineage when exporting metadata No


Process
Date 2021-08-1313:07:13
Tool location c:\program files\arcgis\pro\Resources\ArcToolbox\toolboxes\Data Management Tools.tbx\Rename
Command issued
Include in lineage when exporting metadata No


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Distribution

Distribution format
* Name File Geodatabase Feature Class


Transfer options
* Transfer size 7.365


Online source
Location https://wildlife.ca.gov/Data/BIOS
Function performed information

Online source
Location https://filelib.wildlife.ca.gov/Public/BDB/GIS/BIOS/Public_Datasets/100_199/ds112.zip
Function performed download

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Fields

Details for object ds112
* Type Feature Class
* Row count 0
Definition
In summer 2002, aspen (Populus tremuloides) stands were identified in the South Warner Mountains. The perimeter of each stand was delimited via GPS. Within each of these stands, 1-6 vegetation sample plots (10m x 10m) were measured. The number of plots measured per stand was determined by stand size. The values of the variables in this dataset are intended to represent the entire stand by averaging the values obtained from all the sample plots within each stand. The abbreviation "POTR" represents Populus tremuloides, or aspen.


Field Shape
* Alias OBJECTID
* Data type OID
* Width 4
* Precision 0
* Scale 0
* Field description
Feature geometry.
* Description source
ESRI
* Description of values
Coordinates defining the features.


HideFieldShape


Field SHAPE_area
* Alias Shape_Area
* Data type Double
* Width 8
* Precision 0
* Scale 0
* Field description
Area of feature in internal units squared.
* Description source
ESRI
* Description of values
Positive real numbers that are automatically generated.


HideFieldSHAPE_area


Field ACRES
* Alias ACRES
* Data type Double
* Width 8
* Precision 0
* Scale 0
Field description
Approximate area of stand in acres.
HideFieldACRES


Field YEAR
* Alias YEAR
* Data type Integer
* Width 4
* Precision 0
* Scale 0
Field description
Year
HideFieldYEAR


Field AREA_
* Alias AREA_
* Data type String
* Width 8
* Precision 0
* Scale 0
Field description
Area of polygon in square meters
HideFieldAREA_


Field PERIMETER_
* Alias PERIMETER_
* Data type String
* Width 13
* Precision 0
* Scale 0
Field description
Length of perimeter in meters
HideFieldPERIMETER_


Field COMMENT
* Alias COMMENT
* Data type String
* Width 12
* Precision 0
* Scale 0
Field description
Rating system for confidence in aerial photo interpretation.
List of values
Value 1
Description Certain


Value 2
Description Fairly certain


Value 3
Description Questionable and with a possible conifer content.


HideFieldCOMMENT


Field STAND_CODE
* Alias STAND_CODE
* Data type String
* Width 16
* Precision 0
* Scale 0
Field description
Unique identifier for aspen stands.
HideFieldSTAND_CODE


Field DOMSIZE
* Alias DOMSIZE
* Data type String
* Width 15
* Precision 0
* Scale 0
Field description
Dominant size class of the stand. Dominance was calculated as total basal area of trees using the median Dbh value for each Dbh class.
HideFieldDOMSIZE


Field CON_ASP_RA
* Alias CON_ASP_RA
* Data type Double
* Width 8
* Precision 0
* Scale 0
Field description
Conifer to aspen ratio for the stand.
HideFieldCON_ASP_RA


Field PCTCC
* Alias PCTCC
* Data type Double
* Width 8
* Precision 0
* Scale 0
Field description
Average percent canopy closure among plots for the stand.
HideFieldPCTCC


Field PCTSHRBCOV
* Alias PCTSHRBCOV
* Data type Double
* Width 8
* Precision 0
* Scale 0
Field description
Average percent shrub cover among sample plots for the stand.
HideFieldPCTSHRBCOV


Field FORBSPP
* Alias FORBSPP
* Data type Double
* Width 8
* Precision 0
* Scale 0
Field description
Average number of forb species among sample plots for the stand.
HideFieldFORBSPP


Field GRASSSPP
* Alias GRASSSPP
* Data type Double
* Width 8
* Precision 0
* Scale 0
Field description
Average number of grass species among sample plots for the stand.
HideFieldGRASSSPP


Field SUCKERS_PE
* Alias SUCKERS_PE
* Data type Double
* Width 8
* Precision 0
* Scale 0
Field description
Average number of aspen suckers <1" Dbh per acre within the stand.
HideFieldSUCKERS_PE


Field POTR2ACRE
* Alias POTR2ACRE
* Data type Double
* Width 8
* Precision 0
* Scale 0
Field description
Average number of aspens 1-2" Dbh per acre within the stand.
HideFieldPOTR2ACRE


Field POTR2_4ACR
* Alias POTR2_4ACR
* Data type Double
* Width 8
* Precision 0
* Scale 0
Field description
Average number of aspens 2-4" Dbh per acre within the stand.
HideFieldPOTR2_4ACR


Field POTR4_8ACR
* Alias POTR4_8ACR
* Data type Double
* Width 8
* Precision 0
* Scale 0
Field description
Average number of aspens 4-8" Dbh per acre within the stand.
HideFieldPOTR4_8ACR


Field POTR8_12AC
* Alias POTR8_12AC
* Data type Double
* Width 8
* Precision 0
* Scale 0
Field description
Average number of aspens 8-12" Dbh per acre within the stand.
HideFieldPOTR8_12AC


Field POTR12_16A
* Alias POTR12_16A
* Data type Double
* Width 8
* Precision 0
* Scale 0
Field description
Average number of aspens 12-16" Dbh per acre within the stand.
HideFieldPOTR12_16A


Field POTR16ACRE
* Alias POTR16ACRE
* Data type Double
* Width 8
* Precision 0
* Scale 0
Field description
Average number of aspens >16" Dbh per acre within the stand.
HideFieldPOTR16ACRE


Field X1_POTR
* Alias X1_POTR
* Data type Double
* Width 8
* Precision 0
* Scale 0
Field description
Average number of aspens <1" Dbh among sample plots for the stand.
HideFieldX1_POTR


Field X2_POTR
* Alias X2_POTR
* Data type Double
* Width 8
* Precision 0
* Scale 0
Field description
Average number of aspens 1-2" Dbh among sample plots for the stand.
HideFieldX2_POTR


Field X2_4POTR
* Alias X2_4POTR
* Data type Double
* Width 8
* Precision 0
* Scale 0
Field description
Average number of aspens 2-4" Dbh among sample plots for the stand.
HideFieldX2_4POTR


Field X4_8POTR
* Alias X4_8POTR
* Data type Double
* Width 8
* Precision 0
* Scale 0
Field description
Average number of aspens 4-8" Dbh among sample plots for the stand.
HideFieldX4_8POTR


Field X8_12POTR
* Alias X8_12POTR
* Data type Double
* Width 8
* Precision 0
* Scale 0
Field description
Average number of aspens 9-12" Dbh among sample plots for the stand.
HideFieldX8_12POTR


Field X12_16POTR
* Alias X12_16POTR
* Data type Double
* Width 8
* Precision 0
* Scale 0
Field description
Average number of aspens 12-16" Dbh among sample plots for the stand.
HideFieldX12_16POTR


Field X16_POTR
* Alias X16_POTR
* Data type Double
* Width 8
* Precision 0
* Scale 0
Field description
Average number of aspens >16" Dbh among sample plots for the stand.
HideFieldX16_POTR


Field PCTCONCEAL
* Alias PCTCONCEAL
* Data type Double
* Width 8
* Precision 0
* Scale 0
Field description
Average percent concealment among plots for the stand. Concealment was measured at a distance of 61m using a 1m x 1m sight target board, set vertically on the ground and facing the observer, in 4 directions at each plot and averaged.
HideFieldPCTCONCEAL


Field SUMDEERP
* Alias SUMDEERP
* Data type Double
* Width 8
* Precision 0
* Scale 0
Field description
Average number of deer pellets counted among sample plots for the entire stand.
HideFieldSUMDEERP


Field SUMELKP
* Alias SUMELKP
* Data type Double
* Width 8
* Precision 0
* Scale 0
Field description
Average number of elk pellets counted among sample plots for the entire stand.
HideFieldSUMELKP


Field SUMCOWP
* Alias SUMCOWP
* Data type Double
* Width 8
* Precision 0
* Scale 0
Field description
Average number of cow pies counted among sample plots for the entire stand.
HideFieldSUMCOWP


Field SUMSHEPP
* Alias SUMSHEPP
* Data type Double
* Width 8
* Precision 0
* Scale 0
Field description
Average number of sheep pellets counted among sample plots for the entire stand.
HideFieldSUMSHEPP


Field GPS_DATE
* Alias GPS_DATE
* Data type Date
* Width 8
* Precision 0
* Scale 0
Field description
Date of GPS collection of stand location and perimeter.
HideFieldGPS_DATE


Field GPS_TIME
* Alias GPS_TIME
* Data type String
* Width 13
* Precision 0
* Scale 0
Field description
Time of GPS collection of stand location and perimeter.
HideFieldGPS_TIME


Field DATAFILE
* Alias DATAFILE
* Data type String
* Width 17
* Precision 0
* Scale 0
Field description
GPS file name.
HideFieldDATAFILE


Field HECTARES
* Alias HECTARES
* Data type Double
* Width 8
* Precision 0
* Scale 0
Field description
Approximate area of the stand in hectares.
HideFieldHECTARES


Field UNFILT_POS
* Alias UNFILT_POS
* Data type Double
* Width 8
* Precision 0
* Scale 0


HideFieldUNFILT_POS


Field SHAPE
* Alias Shape_Length
* Data type Double
* Width 8
* Precision 0
* Scale 0
* Field description
Feature geometry.
* Description source
ESRI
* Description of values
Coordinates defining the features.


HideFieldSHAPE


Field Shape_Length
* Alias Shape
* Data type Geometry
* Width 0
* Precision 0
* Scale 0
* Field description
Length of feature in internal units.
* Description source
Esri
* Description of values
Positive real numbers that are automatically generated.


HideFieldShape_Length


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Overview Description
Entity and Attribute Overview
In summer 2002, aspen (Populus tremuloides) stands were identified in the South Warner Mountains of Modoc County, CA. The perimeter of each stand was delimited via GPS. Within each of these stands, 1-6 vegetation sample plots (10mx10m) were measured. The number of plots measured per stand was determined by stand size. The values of the variables in this dataset are intended to represent the entire stand by averaging the values obtained from all the sample plots within each stand. The abbreviation "POTR" represents Populus tremuloides, or aspen.


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Metadata Details

Metadata language English(UNITED STATES)
Metadata character set utf8 - 8 bit UCS Transfer Format


Scope of the data described by the metadata dataset
Scope name * dataset


* Last update 2021-08-13


ArcGIS metadata properties
Metadata format ArcGIS1.0
Standard or profile used to edit metadata FGDC


Created in ArcGIS for the item 2021-08-1313:07:05
Last modified in ArcGIS for the item 2021-08-1313:07:00


Automatic updates
Have been performed Yes
Last update 2021-08-1313:07:00


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Metadata Contacts

Metadata contact
Individual's name Aaron Di Orio
Organization's name Region 1, California Department of Fish and Wildlife
Contact's role point of contact


Contact information
Phone
Voice (530) 340-3913

Address
Type both
Delivery point Shasta Valley Wildlife Area
Delivery point 1724 Ball Mountain Road
City Montague
Administrative area CA
Postal code 96064
Country US
e-mail address adiorio@dfg.ca.gov

HideContact information


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Metadata Maintenance

Maintenance
Update frequency not planned


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