Identification_Information: Citation: Citation_Information: Originator: Thomas W. Sisson Originator: James G. Moore Publication_Date: 2013 Title: TopographicBase.tif Geospatial_Data_Presentation_Form: remote-sensing image Series_Information: Series_Name: Open-File Report Issue_Identification: 2013-1096 Publication_Information: Publication_Place: Reston, VA Publisher: U.S. Geological Survey Online_Linkage: http://pubs.usgs.gov/of/2013/1096/ Description: Abstract: The DRG is a faithfully reproduced digital image of the original source map. Some differences may be detected between the source graphic used and the DRG due to the RGB values assigned that particular color. The intent is to recreate those colors as near as possible. Data completeness for DRG files reflect content of the source graphic. Features may have been eliminated or generalized on the source graphic due to scale and legibility constraints. For information on collection and inclusion criteria, see U.S. Geological Survey, 1994, Standards for 1:24,000-Scale Digital Line Graphs and Quadrangle Maps: National Mapping Program Technical Instructions and U.S. Geological Survey, 1994, Standards for Digital Line Graphs: National Mapping Program Technical Instructions. Purpose: Provided here to show the geologic and topographic relations. Supplemental_Information: Printed Map Sources ------------------- Topographic maps accurately represent the natural and man-made features of the land. USGS topographic maps are compiled to National Map Accuracy Standards using modern mapping techniques. The shape and elevation of terrain are portrayed by contour lines and specific features such as roads, towns, water areas, and vegetation are portrayed by map symbols and colors. Some of these DRG images were acquired indirectly from the United States Geological Survey (USGS) through the North Coast Geographic Information Cooperative (NCGIC). The remaining DRG images were acquired directly from the USGS EROS Data Center via FTP order. These images represent the topographic 1:250,000 series - the entire state of California is available with the exception of the Santa Rosa Island quad. This data is provided "as-is" - the California Department of Fish and Game makes no warranty as to the suitability of this data for any purpose. Additional Information ---------------------- Further Information can be found at the following web sites: * USGS o "Digital Raster Graphics":http://topomaps.usgs.gov/drg/ o "Standardized Data Set Names For DRG Products":http://topomaps.usgs.gov/drg/drg_name.html o "Revised DRG Product Standard":http://topomaps.usgs.gov/drg/drg_standard_change.html * California State Government o "Califonia Geospatial Information Library":http://www.gis.ca.gov/ o "CA DFG - USGS Digital Raster Graphics":http://maphost.dfg.ca.gov/HTML_Sites/drg.htm o "Teale Data Center":http://www.teale.ca.gov/ Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 1987 Ending_Date: 1993 Currentness_Reference: ground condition Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -119.004178 East_Bounding_Coordinate: -118.496001 North_Bounding_Coordinate: 36.505250 South_Bounding_Coordinate: 36.245759 Keywords: Theme: Theme_Keyword: topography Theme_Keyword: elevation Place: Place_Keyword: Case Mountain, CA Place_Keyword: Dennison Peak, CA Place_Keyword: Kaweah, CA Place_Keyword: Mineal King, CA Place_Keyword: Moses Mountain, CA Place_Keyword: Quinn Peak, CA Place_Keyword: Silver City, CA Place_Keyword: California Access_Constraints: none Use_Constraints: Uses of this digital geologic map should not violate the spatial resolution of the data. Although the digital form of the data removes the constraint imposed by the scale of a paper map, the detail and accuracy inherent in map scale are also present in the digital data. The data was edited at a scale of 1:24,000 and higher resolution information is not present in the dataset. Plotting at scales larger than 1:24,000 will not yield greater real detail, although it may reveal fine-scale irregularities below the intended resolution of the database. Similarly, where this database is used in combination with other data of higher resolution, the resolution of the combined output will be limited by the lower resolution of these data. Acknowledgment of the U.S. Geological Survey would be appreciated in products derived from these data. Point_of_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: Joel E. Robinson Contact_Position: Geologist Contact_Voice_Telephone: 650.329.5322 Contact_Facsimile_Telephone: 650.329.5203 Contact_Electronic_Mail_Address: jrobins@usgs.gov Contact_Instructions: Please contact via e-mail Data_Set_Credit: Cal-Atlas Geospatial Clearinghouse Native_Data_Set_Environment: Microsoft Windows 2000 Version 5.2 (Build 3790) Service Pack 2; ESRI ArcCatalog 9.3.1.3000 Data_Quality_Information: Lineage: Process_Step: Process_Description: Process Description ------------------- The production procedures, instrumentation, hardware, and software used in the collection of standard DRG products vary depending on systems used at the contract, cooperator or USGS production sites. The majority of DRG data sets are acquired through government contract. The process step describes, in general, the process used in the production of standard DRG data sets. * Production of a DRG begins with the scanning of a paper 7.5-minute topographic map (map1) on a high-resolution scanner. Scanning resolutions range from 500 - 1000 dpi with the output file running between 160-300 mb. * Removal of screens (descreening) and color quantization to reduce the number of colors also takes place during the scanning phase. * The raw scan file is then transformed and georeferenced using UTM coordinates of the sixteen 2.5-minute grid ticks, which are obtained using the in-house produced program COORDAT and stored in a ground control file. Those sixteen 2.5-minute ticks are interactively visited and assigned their respective UTM coordinates. USGS program XSHAPES4 then performs a piecewise linear rubber sheet transformation. * An output resolution of 2.4 meters (8.2 feet) is chosen in order to resample the file to 250 dpi. * The image file is converted to a TIFF and further reduced by converting the file to a run length encoding Packbits compression(type 32773). * The color palette of the compressed DRG is then standardized by replacing the original RGB values assigned during the scanning process with standard RGB value combinations using the in-house produced TIFFREMAP program. * Prior to archiving the DRG undergoes the following quality assurance procedures: o The color index values of each DRG are checked to ensure the RGB combinations are consistent with the standardized color palette. o All DRG files are inspected to ensure that they are geometrically consistent with normal map presentation. o Selected DRG's are checked to ensure that data elements in the DRG metadata file correspond to the map collar information and to the information in the associated image file. o Selected DRG's are checked for georeferencing accuracy by comparing the book value of latitude and longitude tick marks with corresponding tick intersections in the DRG image. o Transformations are checked on selected DRG's by comparing the positions of well defined points, such as UTM grid intersections in the graphic product, with the corresponding image points in the DRG. California Specific Image Processing Notes ------------------------------------------ Source images were in UTM projection, zone 10 or 11. All images were converted to ARC/INFO grids, reprojected to Albers conic equal-area (standard Teale parameters) while retaining source data resolution, and converted back to TIFF image format using PackBits compression. Some grid reclassification was performed to transform reprojected NODATA areas to white pixels in the output images. Two sets of statewide images are available, standard or trimmed. The standard DRG images include map collar information as displayed on a regular USGS paper map. Trimmed DRG images have been clipped to the neatline of the quad, allowing for easier image mosaicking and edgematching. Clipping was performed using an automated routine in ARC/INFO. Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Raster Raster_Object_Information: Raster_Object_Type: Pixel Row_Count: 18486 Column_Count: 29561 Vertical_Count: 1 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Map_Projection: Map_Projection_Name: Albers Conical Equal Area Albers_Conical_Equal_Area: Standard_Parallel: 34.000000 Standard_Parallel: 40.500000 Longitude_of_Central_Meridian: -120.000000 Latitude_of_Projection_Origin: 0.000000 False_Easting: 0.000000 False_Northing: -4000000.000000 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: row and column Coordinate_Representation: Abscissa_Resolution: 1.527872 Ordinate_Resolution: 1.527872 Planar_Distance_Units: meters Geodetic_Model: Horizontal_Datum_Name: North American Datum of 1983 Ellipsoid_Name: Geodetic Reference System 80 Semi-major_Axis: 6378137.000000 Denominator_of_Flattening_Ratio: 298.257222 Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: TopographicBase.tif.vat Attribute: Attribute_Label: OID 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: Value Attribute: Attribute_Label: Red Attribute: Attribute_Label: Green Attribute: Attribute_Label: Blue Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Address: Address_Type: mailing address Address: Box 25286 Address: Denver Federal Center City: Denver State_or_Province: Colorado Postal_Code: 80225-0046 Country: USA Contact_Voice_Telephone: 303.202.4200 Contact_Voice_Telephone: 1.888.ASK.USGS Contact_Facsimile_Telephone: 303.202.4695 Contact_Electronic_Mail_Address: infoservices@usgs.gov Resource_Description: Downloadable Data Distribution_Liability: This database has been approved for release and publication by the Director of the U.S. Geological Survey (USGS). Although this database has been subjected to rigorous review and is substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, it is released on condition that neither the USGS nor the United States Government may be held liable for any damages resulting from its authorized or unauthorized use. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: TIFF File_Decompression_Technique: ZIP Transfer_Size: 56.2 MB Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://pubs.usgs.gov/of/2013/1096/ Metadata_Reference_Information: Metadata_Date: 20120917 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: Joel E. Robinson Contact_Position: Geologist Contact_Address: Address_Type: mailing address Address: 345 Middlefield Road Address: MS 910 City: Menlo Park State_or_Province: California Postal_Code: 94025 Contact_Voice_Telephone: 650.329.5322 Contact_Facsimile_Telephone: 650.329.5203 Contact_Electronic_Mail_Address: jrobins@usgs.gov Contact_Instructions: Please contact via e-mail 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