Vegetation - Sierra Nevada Foothills [ds83]

File Geodatabase Feature Class

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Tags
Sierra Nevada foothills, habitat type, vegetation surveys, hardwoods, Blue Oak Woodland, Yuba County, Tehama County, Nevada County, California, biota, environment

Summary

WHAT THE DATABASE WAS DESIGNED TO DO The database was designed to examine current Sierra Nevada foothill habitat characteristics to track the occurrence of different landbird communities. HOW THE DATABASE WAS DESIGNED TO BE USED AND BY WHOM This data can be used by land managers, consultants, and land owners for designing and implementing conservation plans in the Sierra Nevada foothills.

Description

TIME PERIOD COVERED These data were collected between May-July 2004 by field crews working for California Department of Fish and Game.

GEOGRAPHIC EXTENT OF THE RECORDS Vegetation plots occur in two study areas on public lands in Yuba and Tehama Counties in the Sierra Nevada foothills.

NUMBER OF RECORDS There are 183 records with habitat attributes measured from 0.05 - 0.10 hectare sampling plots.

BASE DATA STRUCTURE The file is a flat Excel table which gives vegetation attributes for each habitat plot. Each habitat plot is represented by two key fields called "SAMPLE_ID" and "PLOT_NUM" which relate these habitat records to bird and herpetile survey data collected in the same year from the same sample points.

WHAT EACH RECORD REPRESENTS Each record in the table represents the average values for habitat attributes from plots that can be linked with bird count data from the same points. Average values for each sample represent the mean of average values from 3 habitat plots measured at each point.

Credits

There are no credits for this item.

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.

Extent

West -122.090269 East -121.249841 North 40.315161 South 39.076847

Scale Range

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

Topics and Keywords

Themes or categories of the resource biota, environment

Content type Downloadable Data

Export to FGDC CSDGM XML format as Resource Description No

Place keywords Yuba County, Tehama County, Nevada County, California

Theme keywords Sierra Nevada foothills, habitat type, vegetation surveys, hardwoods, Blue Oak Woodland

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Citation

Title Vegetation - Sierra Nevada Foothills [ds83]

Publication date 2003-02-0500:00:00

Presentation formats digital map

FGDC geospatial presentation format vector digital data

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Citation Contacts

Responsible party

Organization's name California Department of Fish & Wildlife, Resource Assessment Program
Individual's name Barry Garrison
Contact's position Staff Environmental Scientist
Contact's role originator

Responsible party

Individual's name Armand Gonzales
Organization's name California Department of Fish and Wildlife
Contact's role point of contact

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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

HOW DATA WERE COLLECTED IN THE FIELD At each plot, three circular plots (0.05-0.10 ha) were randomly placed around these points and were measured for habitat attributes (habitat plots). The 0.10-ha plot (17.8-m radius) was used when < 20 trees > 10 cm diameter at breast height (1.4 m) (dbh) were tallied in the smaller and interior 0.05-ha plot (12.6-m radius). The 100-m radius bird count station in each point was subdivided into three 120 sections (1-120, 121-240, and 241-360), and one habitat plot was placed within each section using a random compass bearing (from bearings within the section) and random distance between 20-80 m. The 20-80 m distance was used so that the habitat plots would be completely within the bird counting area and there would be no overlap in habitat plots from adjacent sections. Within each habitat plot, all live trees > 10 cm dbh were identified to species and measured for stem diameters at dbh. Height (m) was measured from a maximum of four live trees > 10 cm closest to the habitat plot center with one tree each in four quadrants defined by the four cardinal compass directions (NE, SE, SW, and NW). No trees were measured in quadrant if trees were absent within the quadrant within the habitat plot radius. Percent cover of live woody or green vegetation in the tree layer (> 2 m above the ground), shrub layer (0.5-2.0 m), and herbaceous layer (< 0.5 m) was measured at 25 points using a sighting tube (densitometer) held at eye level. Densitometer readings were taken at 4-5 m intervals (4 m for 0.05 ha plots; 5 m for 0.10 ha plots) along eight transects spaced 45 apart within the plot. Three readings each were taken on the eight transects for a total of 24 points with the 25th point taken at the plot's center. WHO COMPILED THE INITIAL DATA Bird data was compiled and analyzed by Barry Garrison with the California Department of Fish and Game. BASIS FOR GEOGRAPHIC COORDINATES Sample points (SAMPLE_ID) were selected from a random sample of 5% of land polygons for the Sierra foothills. The polygons were generated from a geographic information system (GIS) coverage that was created by intersecting data from four biophysical attributes: precipitation, temperature, slope and aspect, and geologic substrate. From the 5% sample, center points of each polygon (centroid) were drawn by a GIS, and the centroids were chosen for the sample points. The centroids were random ground locations for conducting bird counts and habitat sampling. Then the centroids were visually viewed on digital orthophoto quadrangle images to manually pick those completely within the boundaries of the individual units, and were distributed more or less throughout the entire study area. Equivalent numbers of sample locations were chosen for each study area (31 in Tehama County, 30 in Yuba County) to achieve approximately equal sample sizes and survey effort. At each sample location, three points (PLOT_NUM) were plotted in the GIS that were spaced 250 m apart in an equilateral triangle and centered over the centroid.

Processing environment Microsoft Windows Vista Version 6.1 (Build 7601) Service Pack 1; ESRI ArcCatalog 9.3.1.4095

ArcGIS item properties

Name ds83
Location file://\\geodata.\\ds001-099\083-SierraNevadaFoothillVeg\v1\v1_final\ds83.gdb

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Extents

Extent

Geographic extent

Extent

Description

Extent

Geographic extent

Extent in the item's coordinate system

* West longitude -177652.839300
* East longitude -108011.401700
* South latitude 119806.283600
* North latitude 256188.848400
* Extent contains the resource Yes

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Resource Points of Contact

Point of contact

Individual's name Armand Gonzales
Organization's name California Department of Fish and Wildlife
Contact's role point of contact

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Resource Maintenance

Resource maintenance

Update frequency not planned

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Resource Constraints

Constraints

Limitations of use

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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

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

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ArcGIS Feature Class Properties

Feature class name ds83

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Geoprocessing history

Process

Date 2021-06-0811:14:31
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Command issued
Include in lineage when exporting metadata No

Process

Date 2021-06-0811:14:38
Tool location c:\program files\arcgis\pro\Resources\ArcToolbox\toolboxes\Data Management Tools.tbx\Project
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Include in lineage when exporting metadata No

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Date 2021-06-0811:14:44
Tool location c:\program files\arcgis\pro\Resources\ArcToolbox\toolboxes\Data Management Tools.tbx\Rename
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Include in lineage when exporting metadata No