Mojave Desert DRG data.

Metadata:

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

Identification_Information:

Citation:

Citation_Information:

Originator: Mojave Desert Ecosystem Program

Publication_Date: 20010423

Title: Mojave Desert DRG data.

Geospatial_Data_Presentation_Form: map

Publication_Information:

Publication_Place: Barstow, CA 92311

Publisher: Mojave Desert Ecosystem Program

Description:

Abstract:

A DRG is a raster image of a scanned USGS topographic or planimetric map including the collar information, georeferenced to the UTM grid.

Purpose:

A DRG is useful as a source or background layer in a GIS, as a means to perform quality asurance on other digital products, and as a source for the collection and revision of vector data. DRG's can also be merged with other digital data, for example, DEM's or DOQ's, to produce a hybrid digital file.

Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: Various.

Currentness_Reference: Ground Condition

Status:

Progress: Complete

Maintenance_and_Update_Frequency: As needed

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -119.03487

East_Bounding_Coordinate: -112.22842

North_Bounding_Coordinate: 37.83482

South_Bounding_Coordinate: 32.49765

Keywords:

Theme:

Theme_Keyword_Thesaurus: None

Theme_Keyword: digital raster graphic

Theme_Keyword: DRG

Theme_Keyword: topographical map

Access_Constraints: None

Use_Constraints: None

Point_of_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Mr. Clarence Everly

Contact_Organization: Mojave Desert Ecosystem Program (MDEP)

Contact_Position: Project Manager

Contact_Address:

Address_Type: mailing and physical

Address:

222 East Main Street Suite 215

City: Barstow

State_or_Province: CA

Postal_Code: 92311

Country: USA

Contact_Voice_Telephone: (760)255-8886

Contact_Facsimile_Telephone: (760)256-6863

Contact_Electronic_Mail_Address: everlyc@mojavedata.gov

Hours_of_Service: 7:30 a.m. - 4:00 p.m. PST

Contact_Instructions:

Please send requests for information via email, fax or telephone. To access the site on the web, go to the www.mojavedata.gov; make a map of the Mojave to print or download in Adobe Acrobat PDF format, access planimetric data and remotely sensed imagery, or download geospatial data in ArcInfo export format.

Security_Information:

Security_Handling_Description: None

Security_Classification: Unclassified

Security_Classification_System: Unknown

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report:

The DRG uses a standard palette to ensure uniform color throughout a particular map series. The RGB values for a particular color, therefore, will remain consistent throughout that DRG series. Although the color values of the DRG may sometimes match those of the paper source map, a user will usually notice small differences between the colors on the digital image and on the paper map. Also, the quality of the user's monitor affects the DRG color displayed. Although the DRG generally contains the complete content of the source map, features may occasionally be blurred because of substandard source materials. The DRG also may contain misclassified pixels (color noise). The DRG is an 8-bit color image that employs a color palette to ensure uniform colors throughout a particular DRG series. All DRG's within a series must have the same RGB value.

Quantitative_Attribute_Accuracy_Assessment:

Attribute_Accuracy_Value: 00

Attribute_Accuracy_Explanation:

DRG's are examined to ensure color consistency within a series. Inspections are performed on selected DRG's to ensure that both the order of digital numbers (see table 2-2) and digital number values are correct. Colors will be checked for color compliance to map series and for major color differences between features on the DRG and similar features on the source map. Color consistency throughout each series is checked by comparing a DRG to its neighboring quadrangles whenever possible.

Logical_Consistency_Report:

The USGS DRG is produced with the intention of replicating as close as possible the original source map. Users of the DRG will note, however, that a certain amount of "noise" can be discerned when small areas are blown up or viewed under zoomed-in conditions. This noise is in the form of random specks or pixels of color and halos due to any number of factors, such as, the quality of the source, the use of screens and patterns on the litho, and the unevenness of ink due to saturation and absorption. Discontinuities or breaks in linear features may also be present and are due to improper calibration or usage of the scanner, the condition of the source, and resampling. Descreening, quantizing, and noise filtering are methods used to reduce noise, which, besides creating a more aesthetically pleasing image, have the added benefit of reducing the size of the image file. Removal of lithographic screen patterns is preferred but not required.

Completeness_Report:

Image completeness is checked by visually inspecting a sampling of DRG's. Each selected DRG will be examined for gaps (missing data) in the main body of the map, the map collar, the overedge areas, and any insets

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

A random sampling of DRG's will be accuracy tested. The accuracy test will be performed by comparing the positions of UTM grid intersections on the source graphic against the corresponding location on the digital image. A visual inspection will determine whether those coordinates fall within the pixels that define a grid tick. DRG's duplicate the horizontal accuracy of its source.

Quantitative_Horizontal_Positional_Accuracy_Assessment:

Horizontal_Positional_Accuracy_Value: 0

Horizontal_Positional_Accuracy_Explanation:

DRG's will retain the horizontal accuracy of the source maps. Most USGS printed maps contain the National Map Accuracy Standards (NMAS) note in the collar area. The NMAS states that for maps on publication scales of 1:20,000 or smaller, not more than 10 percent of the points tested shall be in error by more than 1/50 inch measured on the publication scale. Test points must be "well-defined", that is, easily visible or recoverable on the ground. For DRG's this accuracy statement applies only to that area of the DRG that falls within the neatline of the source map (excluding inset areas). Overedge areas falling outside the transformation boundary area (the map neatline), can exhibit anomalies or discrepancies. These anomalies also will appear in the map inset areas and in the map collar. For maps without the NMAS note, the horizontal accuracy is unknown. However, the DRG will retain the accuracy of the source map.

Vertical_Positional_Accuracy:

Vertical_Positional_Accuracy_Report:

In the DRG the vertical positional accuracy is referenced in the DRG collar.

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Raster

Raster_Object_Information:

Raster_Object_Type: Pixel

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Planar:

Grid_Coordinate_System:

Universal_Transverse_Mercator:

UTM_Zone_Number: 11

Planar_Coordinate_Information:

Planar_Distance_Units: Meters

Geodetic_Model:

Horizontal_Datum_Name: NAD83 (WGS84)

Entity_and_Attribute_Information:

Overview_Description:

Entity_and_Attribute_Overview:

Each raster entity or pixel contains a digital number from 0 through 12 referencing a color palette of RGB values from 0 through 255 in which the standard colors used in the DRG are defined.

Entity_and_Attribute_Detail_Citation: Standards for Digital Raster Graphic.

Distribution_Information:

Distributor:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Mojave Desert Ecosystem Program

Contact_Person: Clarence Everly

Contact_Position: Program Manager

Contact_Address:

Address_Type: mail and physical

Address:

222 E. Main Street Suite 215

City: Barstow

State_or_Province: CA

Postal_Code: 92311

Country: USA

Contact_Voice_Telephone: (760)255-8886

Contact_Facsimile_Telephone: (760)256-6863

Contact_Electronic_Mail_Address: everlyc@mojavedata.gov

Hours_of_Service: 7:30 a.m. - 4:00 p.m. PST

Contact_Instructions:

Please request information by submitting a request via email, fax or phone contact; you may also visit www.mojavedata.gov, where you can make a map of the Mojave to print or download in Adobe Acrobat PDF format, access planimetric data and remotely sensed imagery, or download geospatial data in ArcInfo export format.

Metadata_Reference_Information:

Metadata_Date: 20010423

Metadata_Review_Date: 20010423

Metadata_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Mojave Desert Ecosystem Program

Contact_Person: Clarence Everly

Contact_Position: Program Manager

Contact_Address:

Address_Type: mailing and physical address

Address:

222 East Main Street Suite 215

City: Barstow

State_or_Province: CA

Postal_Code: 92311

Country: USA

Contact_Voice_Telephone: (760)255-8886

Contact_Facsimile_Telephone: (760)256-6863

Contact_Electronic_Mail_Address: everlyc@mojavedata.gov

Hours_of_Service: 7:30 a.m. - 4:00 p.m. PST

Contact_Instructions:

Please request information by submitting a request via email, fax or phone contact; you may also visit www.mojavedata.gov, where you can make a map of the Mojave to print or download in Adobe Acrobat PDF format, access planimetric data and remotely sensed imagery, or download geospatial data in ArcInfo export format.

Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001-1998

Metadata_Time_Convention: Local time

Metadata_Access_Constraints: None

Metadata_Use_Constraints: None

Metadata_Security_Information:

Metadata_Security_Handling_Description: Unknown

Metadata_Security_Classification: Unclassified

Metadata_Security_Classification_System: None