Mojave National Preserve Transect Rebar Locations (2001-2004)

Metadata:

• Identification_Information
• Data_Quality_Information
• Spatial_Data_Organization_Information
• Spatial_Reference_Information
• Entity_and_Attribute_Information
• Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator: USGS Forest & Rangeland Ecosystem Science Center

Publication_Date: Unpublished Material

Title: Mojave National Preserve Transect Rebar Locations (2001-2004)

Geospatial_Data_Presentation_Form: vector digital data

Description:

Abstract:

This data set is an ArcGIS point shapefile displaying locations of rebar stakes marking transect centers, transect beginning and ending points, and water source locations. Data were gathered using GPS units in 2001, 2002, 2003, and 2004 and recorded in geographic coordinates referenced to the WGS84 datum.

Purpose:

The locations of rebar installed permanently in Mojave National Preserve were recorded with a differentially corrected GPS unit to facilitate their re-location by future investigators or monitoring teams. The pieces of rebar demarcated endpoints of permanent transects on which vegetation and soil measurements were taken through time. Establishing permanent transects removes confounding associated with sampling different locations in different surveys. The measurements were taken at each of 3 points at each distance of 100 m, 400 m, and 1,600 m. In total, we sampled 110 points at 12 wells ([3 points/distance * 3 distances/well * 12 wells] + 2 extra points). The objective of the sampling was to monitor ecosystem response to removal of non-native ungulates (both domestic cattle, Bos taurus, and free-roaming burros, Equus asinus) from the Monument.

Supplemental_Information:

The development of this data set has been plagued with a variety of issues around data collection and processing. Inconsistency of operator experience, a number of GPS instruments, and processing techinques led to doubts about the accuracy of point locations from early surveys - especially when data misalignment was apparent. This data set was developed by examining point locations from six surveys, determining the most consistent sets, and then adjusting other data sets for systematic differences. Field rechecking has verified that the data set is accurate to within a few meters.

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 2001

Ending_Date: 2004

Currentness_Reference: ground condition

Status:

Progress: Complete

Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -116.490898

East_Bounding_Coordinate: -115.321138

North_Bounding_Coordinate: 35.397887

South_Bounding_Coordinate: 34.878212

Keywords:

Theme:

Theme_Keyword_Thesaurus: ISO19115 Topic Category

Theme_Keyword: biota

Theme:

Theme_Keyword_Thesaurus: Biocomplexity Thesaurus

Theme_Keyword: arid environment

Theme_Keyword: grazing

Theme_Keyword: introduced plants

Theme_Keyword: ecosystem disturbance

Theme_Keyword: monitoring

Theme_Keyword: ecosystem recovery

Theme:

Theme_Keyword_Thesaurus: None

Theme_Keyword: livestock grazing

Theme_Keyword: aggregate soil stability

Theme_Keyword: penetration resistance

Theme_Keyword: vegetation variables

Place:

Place_Keyword_Thesaurus: None

Place_Keyword: Mojave National Preserve

Place_Keyword: California

Place_Keyword: CA

Access_Constraints: None

Use_Constraints: None

Native_Data_Set_Environment:

Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.0.0.535

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report: No tests for attribute accuracy were conducted

Logical_Consistency_Report:

Four GPS surveys were merged into a single layer. In order for the merging process to work properly, the four attributes common to all four surveys were reformatted using these specifications: Attribute Type Precision Scale Comment Text GPS_Height Double 15 3 Lat Double 12 6 Long Double 12 6

There are meaningful values in these four fields for all entries.

Completeness_Report:

GPS_Date, Horz_Prec, and Vert_Prec were not captured during GPS processing for some surveys.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

GPS measurements were differentially corrected with horizontal precisions values ranging from 0.7 to 19.2 meters. Field verification in May 2004 indicated that revisited locations were accurate to "a few meters".

Vertical_Positional_Accuracy:

Vertical_Positional_Accuracy_Report:

Differentially corrected GPS measurements produced vertical precision values ranging from 1.1 to 32.4 meters. No field verification was conducted.

Lineage:

Source_Information:

Source_Citation:

Citation_Information:

Originator: USGS Forest & Rangeland Ecosystem Science Center

Publication_Date: Unpublished Material

Title: Mojave NP GPS Survey - Spring 2001

Geospatial_Data_Presentation_Form: vector digital data

Type_of_Source_Media: electronic files

Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 200106

Source_Currentness_Reference: ground condition

Source_Citation_Abbreviation: Spring01

Source_Contribution:

These points served as reference information when determining adjustments to other surveyed data sets.

Source_Information:

Source_Citation:

Citation_Information:

Originator: USGS Forest & Rangeland Ecosystem Science Center

Publication_Date: Unpublished Material

Title: Mojave NP GPS Survey - Fall 2001

Geospatial_Data_Presentation_Form: vector digital data

Type_of_Source_Media: electronic files

Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 200109

Source_Currentness_Reference: ground condition

Source_Citation_Abbreviation: fall01

Source_Contribution:

These points served as reference information when determining adjustments to other surveyed data sets.

Source_Information:

Source_Citation:

Citation_Information:

Originator: USGS Forest & Rangeland Ecosystem Science Center

Publication_Date: Unpublished Material

Title: Mojave NP GPS Survey - 2002

Geospatial_Data_Presentation_Form: vector digital data

Type_of_Source_Media: electronic files

Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 2002

Source_Currentness_Reference: ground condition

Source_Citation_Abbreviation: survey02

Source_Contribution:

This data set represents the point locations of the following transects: Well 30 - beginning and ending points of three transects at Points A, B, C(x), D, E, F(x) and H. New 13 - beginning and ending points of three transects at Points B, C, D (except D Tr1b), E, F, G, H and I. Tenmile Tank - Beginning and ending points of three transects at Points A(x), B, C, D, E, F, F(x), G (except Tr3), H and I

Source_Information:

Source_Citation:

Citation_Information:

Originator: USGS Forest & Rangeland Ecosystem Science Center

Publication_Date: Unpublished Material

Title: Mojave NP GPS Survey - Spring 2003

Geospatial_Data_Presentation_Form: vector digital data

Type_of_Source_Media: electronic files

Source_Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 200304

Ending_Date: 200305

Source_Currentness_Reference: ground condition

Source_Citation_Abbreviation: spring03

Source_Contribution:

This data set represents the point locations of the following transects: Fourteenmile Tank - water source Sixmile Tank - Point centers and transect ending points at C, D, E, F, G, H and I. New 6 - Point centers and transect endpoints at A, B, C, D, F, G, H, and I. New 12 - Point centers (except D) and transect endpoints at A, B, C, D, E, F, G, H and I. Well 30 - Point centers A, B, C(x), D, E, F(x), G, H and I(x). Beginning and ending points for three transects at G and I(x). Well 13 - Point centers and beginning and ending points of three transects at A, B, C, D, E, F, G, H and I. MidValley Tank - Point centers and transect ending points at A, B, C, D, E, F, G, H and I. Hidden Valley Tank - Point centers and transect ending points at A, B, C, D, E, F, H and I. New 13 - Point centers at A, B, C, D, E, F, G, H and I. Transect ending point at ATr1. Tenmile Tank - Point centers at A(x), B, C, D, E, F, F(x), G, H and I.

Source_Information:

Source_Citation:

Citation_Information:

Originator: USGS Forest & Rangeland Ecosystem Science Center

Publication_Date: Unpublished Material

Title: Mojave NP GPS Survey - Fall 2003

Geospatial_Data_Presentation_Form: vector digital data

Type_of_Source_Media: electronic files

Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 200310

Source_Currentness_Reference: ground condition

Source_Citation_Abbreviation: fall03

Source_Contribution:

This data set represents the point locations of the following transects: Well 2 - water source. Point centers C, D, E, F, G, H and I and beginning and ending points for three transects at A (except ATr3b), B, C, D, E, F, G, H and I. Fourteenmile Tank - Point centers and transect end points at A, B, C, D, E, F, G, H, I, I(x) and J(x). New 12 - Point center D. Well 30 - water source Well 13 - water source New 5 - water source. Point centers and beginning and ending points of three transects at A, B, C, D, E, F, G, H and I. Mid Valley Tank - water source. Hidden Valley Tank - water source. Point center and transect endpoints at G. New 13 - water source. Transect points ATr1e and DTr1b.

Source_Information:

Source_Citation:

Citation_Information:

Originator: USGS Forest & Rangeland Ecosystem Science Center

Publication_Date: Unpublished Material

Title: Mojave NP GPS Survey - Winter 2004

Geospatial_Data_Presentation_Form: vector digital data

Type_of_Source_Media: electronic files

Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 200402

Source_Currentness_Reference: ground condition

Source_Citation_Abbreviation: davepts

Source_Contribution:

This data set represents the point locations of the following transects: Well 2 - Point centers at A and B. Transect point ATr3b. Sixmile Tank - water source. Point centers A and B. Tenmile Tank - water source. Beginning and ending points at GTr3.

Process_Step:

Process_Description:

Locations from six surveys were examined for consistency. Spring01 and fall01, while incomplete, were found to be in good agreement with the fall03 survey. This conclusion was verified by additional data collected for winter04. Systematic offsets appeared in the survey02 and spring03 data.

Source_Used_Citation_Abbreviation: spring01

Source_Used_Citation_Abbreviation: fall01

Source_Used_Citation_Abbreviation: survey02

Source_Used_Citation_Abbreviation: spring03

Source_Used_Citation_Abbreviation: fall03

Source_Used_Citation_Abbreviation: winter04

Process_Date: 200312

Process_Step:

Process_Description:

survey02 was converted to and ArcInfo coverage and the points were graphically adjusted approximately 12 meters west and 2 meters north to correspond with duplicate locations collected in 2001 and 2004.

Source_Used_Citation_Abbreviation: survey02

Process_Date: 20040326

Source_Produced_Citation_Abbreviation: fixcov302

Process_Step:

Process_Description:

spring 03 was converted to an ArcInfo coverage and the points were graphically adjusted approximately 31 meters west and 3 meters north to correspond with duplicate locations collected in 2001 and 2004.

Source_Used_Citation_Abbreviation: spring03

Process_Date: 20040520

Source_Produced_Citation_Abbreviation: fixcov102

Process_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization:

US Geological Survey Forest and Rangeland Ecosystem Science Center

Contact_Person: Lienkaemper, George

Contact_Position: GIS Specialist

Contact_Address:

Address_Type: mailing and physical address

Address: 3200 SW Jefferson Way

City: Corvallis

State_or_Province: OR

Postal_Code: 97331

Contact_Voice_Telephone: (541) 750-7343

Contact_Facsimile_Telephone: (541) 758-7761

Contact_Electronic_Mail_Address: george_lienkaemper@usgs.gov

Process_Step:

Process_Description:

fix102cov and fix302cov were exported as shapefiles in ArcMap and projection information was assigned - geographic data, datum WGS84

Source_Used_Citation_Abbreviation: fix102cov

Source_Used_Citation_Abbreviation: fix302cov

Process_Date: 20040521

Source_Produced_Citation_Abbreviation: shape102ex

Source_Produced_Citation_Abbreviation: shape302ex

Process_Step:

Process_Description:

Latitude and longitude values were generated from the layer properties of four surveys, shape302ex, shape102ex, fall03, and winter04. Data fields for four attributes common to all data sets were reformated to match the fall03 field properties (see logical consistency report). These four data sets were merged using the GeoProcessing Wizard in ArcMap to create merge_060304.

Source_Used_Citation_Abbreviation: shape302ex

Source_Used_Citation_Abbreviation: shape102ex

Source_Used_Citation_Abbreviation: fall03

Source_Used_Citation_Abbreviation: winter04

Process_Date: 20040603

Source_Produced_Citation_Abbreviation: merge_0060304

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Vector

Point_and_Vector_Object_Information:

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: Entity point

Point_and_Vector_Object_Count: 531

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Geographic:

Latitude_Resolution: 0.000028

Longitude_Resolution: 0.000028

Geographic_Coordinate_Units: Decimal degrees

Geodetic_Model:

Horizontal_Datum_Name: D_WGS_1984

Ellipsoid_Name: WGS_1984

Semi-major_Axis: 6378137.000000

Denominator_of_Flattening_Ratio: 298.257224

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: Merge_060304.dbf

Entity_Type_Definition: ArcGIS database file

Entity_Type_Definition_Source: ESRI

Attribute:

Attribute_Label: FID

Attribute_Definition: Internal feature number.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain:

Sequential unique whole numbers that are automatically generated.

Attribute:

Attribute_Label: Shape

Attribute_Definition: Feature geometry.

Attribute_Definition_Source: ESRI

Attribute_Domain_Values:

Unrepresentable_Domain: Coordinates defining the features.

Attribute:

Attribute_Label: Comment

Attribute_Definition: Tag identification number

Attribute_Domain_Values:

Unrepresentable_Domain:

A concatenation of site identifier, transect point identifier, transect number, and beginning or ending identifier. Sites: W2 = Well 2, FT = Fourteenmile Tank, TT = Tenmile Tank, ST = Sixmile Tank, HVT = Hidden Valley Tank, MVT = Mid Valley Tank, W30 = Well 30, W13 = Well 13, N6 = New 6, N5 = New 5, N12 = New 12, N13 = New 13 Center Points: A through I at all locations, identified by the letter followed by "Cen"; A(x) indicates an exclosure; at one site a point J(x) is included Transect Points: At the 2001 design sites transect points are indentified by "Tr" followed by the transect number (1-3) and a beginning (b) or ending (e) identifier. For 2002 design sites, only the transect endpoint is indentifed for two transects. Water Source = identified as "well". Examples: STF(x)Cen; Sixmile Tank Point F(x) center N13Well = New 13 water source N6ATr2 = New 6 Point A transect 2 endpoint (2002 design) W30HTr3b = Well 30 Point H transect 3 beginning point

Attribute:

Attribute_Label: GPS_Date

Attribute_Definition: Date of GPS data collection

Attribute_Definition_Source: Trimble

Attribute_Domain_Values:

Unrepresentable_Domain: Date format mm/dd/yyyy

Attribute:

Attribute_Label: GPS_Height

Attribute_Definition: Elevation

Attribute_Definition_Source: Trimble

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0 (null value)

Range_Domain_Maximum: unknown maximum

Attribute_Units_of_Measure: meters

Attribute:

Attribute_Label: Vert_Prec

Attribute_Definition: Precision of elevation measurement

Attribute_Definition_Source: Trimble

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0 (null value)

Range_Domain_Maximum: unknown maximum

Attribute_Units_of_Measure: meters

Attribute:

Attribute_Label: Horz_Prec

Attribute_Definition: Precision of horizontal coordinate measurement

Attribute_Definition_Source: Trimble

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0 (null value)

Range_Domain_Maximum: unknown maximum

Attribute_Units_of_Measure: meters

Attribute:

Attribute_Label: lat

Attribute_Definition: northing GPS coordinate

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: -90

Range_Domain_Maximum: 90

Attribute_Units_of_Measure: decimal degrees

Attribute:

Attribute_Label: long

Attribute_Definition: easting GPS coordinate

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: -180

Range_Domain_Maximum: 180

Attribute_Units_of_Measure: decimal degrees

Attribute:

Attribute_Label: Type

Attribute_Definition: GPS point type

Attribute_Definition_Source: Dataset developer

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: W

Enumerated_Domain_Value_Definition: well location

Enumerated_Domain:

Enumerated_Domain_Value: C

Enumerated_Domain_Value_Definition: Transect center

Enumerated_Domain:

Enumerated_Domain_Value: X

Enumerated_Domain_Value_Definition: Transect ending point

Enumerated_Domain:

Enumerated_Domain_Value: B

Enumerated_Domain_Value_Definition: Transect starting point

Attribute:

Attribute_Label: design

Attribute_Definition: Plot transect design

Attribute_Definition_Source: Dataset developer

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Control

Enumerated_Domain:

Enumerated_Domain_Value: 2001

Enumerated_Domain:

Enumerated_Domain_Value: 2002

Metadata_Reference_Information:

Metadata_Date: 20060224

Metadata_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization:

US Geological Survey Forest and Rangeland Ecosystem Science Center

Contact_Person: Metadata Coordinator

Contact_Address:

Address_Type: mailing and physical address

Address: 3200 SW Jefferson Way

City: Corvallis

State_or_Province: OR

Postal_Code: 97331

Contact_Voice_Telephone: (541) 750-7343

Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001-1998

Metadata_Time_Convention: local time

Metadata_Extensions:

Online_Linkage: <http://www.esri.com/metadata/esriprof80.html>

Profile_Name: ESRI Metadata Profile