Identification_Information: Citation: Citation_Information: Originator: Daniel H. Knepper, Jr. Publication_Date: 2010 Title: Potential Hydrothermally Altered Rocks in Central Colorado Derived From Landsat Thematic Mapper Data: A GIS Dataset Geospatial_Data_Presentation_Form: vector digital data Online_Linkage: http://pubs.usgs.gov/of/2010/1076/ Description: Abstract: As part of the Central Colorado Mineral Resource Assessment Project, the digital image data for four Landsat Thematic Mapper TM scenes covering all of central Colorado between Wyoming and New Mexico were acquired and band ratios were calculated after masking pixels dominated by vegetation, snow, and shadows. High ratio values were visually enhanced by contrast stretching, revealing only those areas with strong spectral responses (high ratio values). A color-ratio composite mosaic was prepared for the four scenes so that the distribution of potentially hydrothermally altered rocks could be visually evaluated. To provide a more useful input to a GIS-based mineral resource assessment, the information contained in the color-ratio composite raster image mosaic was converted to vector-based polygons after filtering and thresholding for the strongest spectral responses. Purpose: To provide a more useful input to a GIS-based mineral resource assessment, the information contained in the color-ratio composite raster image mosaic was converted to vector-based polygons after filtering and thresholding for the strongest spectral responses. Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2009 Currentness_Reference: REQUIRED: The basis on which the time period of content information is determined. Status: Progress: Complete Maintenance_and_Update_Frequency: Unknown Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -106.687662 East_Bounding_Coordinate: -104.868724 North_Bounding_Coordinate: 41.010191 South_Bounding_Coordinate: 36.991288 Keywords: Theme: Theme_Keyword_Thesaurus: REQUIRED: Reference to a formally registered thesaurus or a similar authoritative source of theme keywords. Theme_Keyword: Central Colorado Theme_Keyword: hydrothermal alteration, Landsat TM, ratios Access_Constraints: REQUIRED: None Use_Constraints: REQUIRED: Restrictions and legal prerequisites for using the data set after access is granted. Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Daniel H. Knepper, Jr. Contact_Organization: United States Geological survey Contact_Position: Research Geologist Contact_Voice_Telephone: 303-236-1385 Contact_Electronic_Mail_Address: dknepper@usgs.gov Native_Data_Set_Environment: Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcCatalog 9.3.1.1850 Cross_Reference: Citation_Information: Originator: Daniel H. Knepper, Jr. Title: Potential Hydrothermally Altered Rocks in Central Colorado Derived From Landsat Thematic Mapper Data: A GIS Dataset Data_Quality_Information: Lineage: Process_Step: Process_Description: Dataset copied. Source_Used_Citation_Abbreviation: http://pubs.usgs.gov/of/2010/1076/downloads/ Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Vector Point_and_Vector_Object_Information: SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: G-polygon Point_and_Vector_Object_Count: 103321 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Grid_Coordinate_System: Grid_Coordinate_System_Name: Universal Transverse Mercator Universal_Transverse_Mercator: UTM_Zone_Number: 13 Transverse_Mercator: Scale_Factor_at_Central_Meridian: 0.999600 Longitude_of_Central_Meridian: -105.000000 Latitude_of_Projection_Origin: 0.000000 False_Easting: 500000.000000 False_Northing: 0.000000 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: coordinate pair Coordinate_Representation: Abscissa_Resolution: 0.000000 Ordinate_Resolution: 0.000000 Planar_Distance_Units: meters Geodetic_Model: Horizontal_Datum_Name: North American Datum of 1927 Ellipsoid_Name: Clarke 1866 Semi-major_Axis: 6378206.400000 Denominator_of_Flattening_Ratio: 294.978698 Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: TM_potential_alteration 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: Id Attribute: Attribute_Label: GRIDCODE Attribute: Attribute_Label: Mineral_Gr Distribution_Information: Resource_Description: Downloadable Data Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Transfer_Size: 25.400 Metadata_Reference_Information: Metadata_Date: 20090218 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: REQUIRED: The organization responsible for the metadata information. Contact_Person: REQUIRED: The person responsible for the metadata information. Contact_Address: Address_Type: REQUIRED: The mailing and/or physical address for the organization or individual. City: REQUIRED: The city of the address. State_or_Province: REQUIRED: The state or province of the address. Postal_Code: REQUIRED: The ZIP or other postal code of the address. Contact_Voice_Telephone: REQUIRED: The telephone number by which individuals can speak to the organization or individual. 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