Identification_Information: Citation: Citation_Information: Originator: U.S. Geological Survey Publication_Date: Unpublished Material Title: lcr1938_06.txt Geospatial_Data_Presentation_Form: remote-sensing image Larger_Work_Citation: Citation_Information: Originator: By Laura M. Norman , Michael Gishey, Leila Gass, Brian Yanites , Edwin Pfeifer, Ron Simms , and Ray Ahlbrandt Publication_Date: 2006 Title: Processed 1938 Aerial Photography for Selected Areas of the Lower Colorado River, Southwestern United States Geospatial_Data_Presentation_Form: document Series_Information: Series_Name: Open File Report Publication_Information: Publisher: US Geological Survey Description: Abstract: The objective of this project is to improve understanding of the history and rates of landscape and ecologic change along the lower Colorado River and of their effects on geologic and hydrologic processes. The datasets allow an analysis of historical changes in the river's landscape and ecosystems, as well as modeling of the geomorphology of the river valley and related linkages between habitat, ground water, surface water, and sediment. Purpose: This image is one of 15 created for a geospatial analysis of change in river channel position for the Lower Colorado River. Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 19380424 Currentness_Reference: ground condition Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -114.592388 East_Bounding_Coordinate: -114.367147 North_Bounding_Coordinate: 34.841443 South_Bounding_Coordinate: 34.588398 Keywords: Theme: Theme_Keyword_Thesaurus: http://www.fgdc.gov/clearinghouse/reference/nasa_long.html Theme_Keyword: Rivers Theme_Keyword: Geomorphology Theme_Keyword: Riparian Communities Place: Place_Keyword: California Place_Keyword: Arizona Place_Keyword: Topock Place_Keyword: Catfish Paradise Place_Keyword: Fivemile Landing Access_Constraints: None. Use_Constraints: None. Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Laura Norman Contact_Organization: Southwest Geographic Science Center, U.S. Geological Survey Contact_Address: Address_Type: mailing and physical address Address: 520 N. Park Ave., Suite 106 City: Tucson State_or_Province: AZ Postal_Code: 85719 Country: USA Contact_Electronic_Mail_Address: lnorman@usgs.gov Data_Set_Credit: Aerial photos from the U.S. Bureau of Reclamation, Lower Colorado Regional Office, Boulder City. Scanning, mosaicing and image recitification by Brian Yanites and Mike Gishey, U.S. Geological Survey. Security_Information: Security_Classification: Unclassified 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: Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: Mosaic images vary in positional accuracy. Offsets from digital orthophotos used in rectification process are due to lack of elevation data and other ground control data. Lineage: Source_Information: Source_Citation: Citation_Information: Originator: U.S. Bureau of Reclamation Title: Colorado River Frontwork & Levee System Edition: flown by Fairchild Aerials, Los Angeles Other_Citation_Details: Scale of photos is 1:20,000. Colo. R. 2-71,4/24/1938; Colo. R. 2-72,4/24/1938; Colo. R. 2-73,4/24/1938; Colo. R. 2-74,4/24/1938; Colo. R. 2-75,4/24/1938; Colo. R. 2-76,4/24/1938; Colo. R. 2-77,4/24/1938; Colo. R. 2-79,4/24/1938; Colo. R. 2-80,4/24/1938; Colo. R. 2-81,4/24/1938; Colo. R. 2-82,4/24/1938; Colo. R. 2-83,4/24/1938; Colo. R. 2-84,4/24/1938; Colo. R. 2-85,4/24/1938; Colo. R. 2-86,4/24/1938; Colo. R. 2-87,4/24/1938; Colo. R. 2-88,4/24/1938; Colo. R. 2-89,4/24/1938; Colo. R. 2-90,4/24/1938 Type_of_Source_Media: Aerial photographs Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 19380424 Source_Currentness_Reference: ground condition Source_Information: Source_Citation: Citation_Information: Originator: U.S. Geological Survey Publication_Date: 1992-1996 Title: Digital Orthophoto Quarter Quadrangle Source_Time_Period_of_Content: Time_Period_Information: Multiple_Dates/Times: Single_Date/Time: Calendar_Date: 1992-1996 Process_Step: Process_Description: Individual aerial photo prints were scanned at 500 dpi. Images were then mosaiced using Adobe Photoshop, resulting in 16 mosaic images that followed index maps previously prepared by the U.S. Bureau of Reclamation. The mosaics were then rectified to mid-1990s digital orthophotos (image-to-image) using ERDAS Imagine, with 14 to 57 ground control points used per mosaic (number of ground control points depended on the number of identifiable features appearing in both the 1938/1939 images and the 1990s digital orthophotos). This mosaic had 27 ground control points. Process_Date: 12/2004 Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Raster Raster_Object_Information: Raster_Object_Type: Pixel Row_Count: 31279 Column_Count: 22623 Vertical_Count: 1 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Grid_Coordinate_System: Grid_Coordinate_System_Name: Universal Transverse Mercator Universal_Transverse_Mercator: UTM_Zone_Number: 11 Transverse_Mercator: Scale_Factor_at_Central_Meridian: 0.999600 Longitude_of_Central_Meridian: -117.000000 Latitude_of_Projection_Origin: 0.000000 False_Easting: 500000.000000 False_Northing: 0.000000 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: row and column Coordinate_Representation: Abscissa_Resolution: 0.881985 Ordinate_Resolution: 0.881985 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: Band_1 Attribute: Attribute_Label: ObjectID 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: Count Distribution_Information: Resource_Description: Downloadable Data Distribution_Liability: Although these data have been compiled by the U.S. Geological Survey (USGS), U.S. Department of the Interior (USDOI), these data and information are provided with the understanding that they are not guaranteed to be 100% accurate or complete. Users are cautioned to consider carefully the provisional nature of these data and information before using them for decisions that concern personal or public safety or the conduct of business that involves substantial monetary or operational consequences. Conclusions drawn from, or actions undertaken on the basis of, such data and information are the sole responsibility of the user. Neither the U.S. Government nor any agency thereof, nor any of their employees, contractors, or subcontractors, make any warranty, express or implied, nor assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any data, software, information, apparatus, product, or process disclosed, nor represent that its use would not infringe on privately owned rights. Trade, firm, or product names and other references to non-USGS products and services are provided for information only and do not constitute endorsement or warranty, express or implied, by the USGS, USDOI, or U.S. Government, as to their suitability, content, usefulness, functioning, completeness, or accuracy. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Transfer_Size: 0.000 Metadata_Reference_Information: Metadata_Date: 20060322 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: Southwest Geographic Science Team Contact_Address: Address_Type: mailing and physical address Address: 520 N. Park Ave., Suite 106 City: Tucson State_or_Province: AZ Postal_Code: 85719 Contact_Voice_Telephone: 520-670-5510 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 Metadata_Extensions: Online_Linkage: http://www.esri.com/metadata/esriprof80.html Profile_Name: ESRI Metadata Profile