Identification_Information: Citation: Citation_Information: Originator: Peterson, J.A. Originator: Berquist, J.R. Originator: Reynolds, S.J. Originator: Page-Nedell, S.S. Originator: Orris, Greta J. (digital editor) Originator: Oland, Paul (digital compiler) Originator: Hirschberg, Douglas M. (digital compiler) Publication_Date: 2001 Title: Geologic map of the Tucson and Nogales quadrangles (Arizona, scale 1:250,000): A Digital Database Edition: version 1 Geospatial_Data_Presentation_Form: map Series_Information: Series_Name: U.S. Geological Survey Open-File Report Issue_Identification: OFR 01-275 Publication_Information: Publication_Place: Tucson, AZ Publisher: U.S. Geological Survey Online_Linkage: Description: Abstract: The Tucson-Nogales dataset was digitized by U.S. Geological Survey staff and contractors in the Southwest Field Office, Tucson, Arizona for input into an ArcInfo geographic information system (GIS); point features, such as strike and dip, were not captured. Purpose: This dataset was constructed to provide the Carbonate Resource Evaluation System (CRES) of the National Industrial Minerals and Surficial Processes Project with a southwest dataset to use to test the CRES tools. Supplemental_Information: Because the original map was a single color map, many of the polygons did not close or were not labeled. Dr. Orris used a variety of published and unpublished work to resolve these and other geologic problems with the original mapping. Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1990 Currentness_Reference: date of original map publication Status: Progress: complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -112. East_Bounding_Coordinate: -110. North_Bounding_Coordinate: 33. South_Bounding_Coordinate: 31.3 Keywords: Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: geology Theme_Keyword: geologic map Place: Place_Keyword_Thesaurus: None Place_Keyword: Tucson Place_Keyword: Arizona Place_Keyword: Nogales Access_Constraints: None Use_Constraints: These data are not to be used at scales greater than 1:250,000. Any hardcopies utilizing these data sets shall clearly indicate their source. If the user has modified the data in any way they are obligated to describe the types of modifications they have performed on the hardcopy map. User specifically agrees not to misrepresent these data sets, nor to imply that changes they made were approved by the U.S. Geological Survey. Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Dr. Greta J. Orris Contact_Organization: U.S. Geological Survey Contact_Position: Geologist Contact_Address: Address_Type: mailing and physical address Address: 520 N. Park Ave., Suite 355 City: Tucson State_or_Province: AZ Postal_Code: 85719-5035 Country: USA Contact_Voice_Telephone: 520-670-5583 Contact_Facsimile_Telephone: 520-670-5113 Contact_Electronic_Mail_Address: greta@usgs.gov Data_Set_Credit: G. Stephen Pitts provided invaluable assistance and advice on how to make this map digital and publish the result. Native_Data_Set_Environment: SunOS, 5.6, sun4u UNIX ARCINFO version 7.2.1 Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: Attribute accuracy was verified by manual comparison of hard copy plots of the digital dataset with the source materials. Logical_Consistency_Report: Polygon and chain-node topology present. Polygons intersecting the neatline are closed along the border. Segments making up the outer and inner boundaries of a polygon tie end-to-end to completely enclose the area. Line segments are a set of sequentially numbered coordinate pairs. No duplicate features exist nor duplicate points in a data string. Intersecting lines are separated into individual line segments at the point of intersection. All nodes are represented by a single coordinate pair that indicates the beginning or end of a line segment. Completeness_Report: All geologic units and line data were captured from Peterson and others, 1990; point data, such as strike and dip, were not captured. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: Arcs are probably no more accurate than approximately 200 m based upon the RMS error encountered when transforming the dataset based on mathmetically defined tics. Lineage: Source_Information: Source_Citation: Citation_Information: Originator: Peterson, J.A. Originator: Berquist, J.R. Originator: Reynolds, S.J. Originator: Page-Nedell, S.S. Publication_Date: 1990 Title: Geologic map of the Tucson and Nogales quadrangles, in Peterson, J.A., ed., Preliminary mineral resource assessment of the Tucson and Nogales 1° x 2° quadrangles, Arizona (plate 1) U.S. Geological Survey Open-File Report 90-276, 134 p., 24 plates. Geospatial_Data_Presentation_Form: map Series_Information: Series_Name: Open-File Report Issue_Identification: OF 90-276 Publication_Information: Publication_Place: Menlo Park, CA Publisher: U.S. Geological Survey Source_Scale_Denominator: 250,000 Type_of_Source_Media: mylar Source_Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 1990 Source_Currentness_Reference: publication date Source_Citation_Abbreviation: Peterson and others, 1990 Source_Contribution: This is the major source for the dataset. Process_Step: Process_Description: Southwest Field Office GIS staff/contractors procured a mylar copy of the "Geologic Map of the Tucson and Nogales Quadrangles" and a gray-scale scan was made of the of the mylar map at 300 dpi resolution. A set of tics were mathmetically generated for pre-selected latitude-longitude coordinates then projected to the Universal Tranverse Mercator projection (zone 12) and the scanned map was registered to the set of tics. The map was divided into ten sections and the line work was digitized and attributed for each of the sections in a "heads- up", on-screen fashion. A standard zoom scale was employed when digitizing the arcs. Check plots were produced to check both line (arc) locational and attributional fidelity relative to the source mylar map. Line work accuracy was verified. The editor made changes where appropriate and the edits were entered. The checking/editing process was repeated until no additional corrections could be identified. The 10 digitized sections were joined, edited for dangles and undershoots, and cleaned to produce polygon topology. Polygons were attributed with the geologic (rock) unit label. Queried units, unlabeled units, and multiple-labeled units from the original map were flagged in the coverage. Check plots were made of the polygon rock unit attributes. The editor employed other published and unpublished geologic maps to resolve the flagged units. Geologic inconsistencies (such as adjacent polygons with the same geologic label) were identified and resolved. This step was repeated as needed. The accompanying tables were defined and populated. Files accompanying the database where produced. Process_Date: 19991201 to 20000830 Process_Step: Process_Description: First draft of metadata created by G.S. Pitts using FGDCMETA.AML ver. 1.2 05/14/98 Process_Date: 20000927 Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Vector Point_and_Vector_Object_Information: SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: Point Point_and_Vector_Object_Count: 2279 SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: String Point_and_Vector_Object_Count: 6621 SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains Point_and_Vector_Object_Count: 2280 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Grid_Coordinate_System: Grid_Coordinate_System_Name: Universal Transverse Mercator Universal_Transverse_Mercator: UTM_Zone_Number: 12 Transverse_Mercator: Scale_Factor_at_Central_Meridian: 0.9996 Longitude_of_Central_Meridian: -111.0 Latitude_of_Projection_Origin: 0.0 False_Easting: 0.0 False_Northing: 0.0 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: coordinate pair Coordinate_Representation: Abscissa_Resolution: 20. Ordinate_Resolution: 20. Planar_Distance_Units: Meters Geodetic_Model: Horizontal_Datum_Name: North American Datum of 1927 Ellipsoid_Name: Clarke 1866 Semi-major_Axis: 6378206.4 Denominator_of_Flattening_Ratio: 294.98 Entity_and_Attribute_Information: Overview_Description: Entity_and_Attribute_Overview: The digital database for the geologic map of the Tucson and Nogales quadrangles consists of one ArcInfo arc and polygon coverage, which produces an arc attribute table (tn250k.aat), and a polygon attribute table (tn250k.pat). There are also five accompanying INFO data files, tn250k.con, tn250k.lgu, tn250k.ref, tn250k.ru, and tn250k.str, as look-up tables containing additional attributions for arcs and polygons. The ArcInfo coverage, tn250k, contains geologic contacts (linecodes less than 100) which relate to the tn250k.con table, geologic faults (linecodes 100 to 600) which relate to the tn250k.str table, linear geologic (rock) units (linecodes greater than 600) which relate to the tn250k.lgu table, areal (polygonal) rock units which relate to the tn250k.ru table. All features relate to the tn250k.ref table which contains information on the source. Entity_and_Attribute_Detail_Citation: none A detailed description of the attributes for the digital database of the geologic map of the Tucson and Nogales 1:250,000-scale quadrangles are given in the text of Open-File Report 01-275, available in Adobe PDF on the World Wide Web at http://geopubs.wr.usgs.gov/open-file/of01-275. Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Information Services Contact_Address: Address_Type: mailing and physical address Address: Box 25286 City: Denver State_or_Province: CO Postal_Code: 80225 Country: U.S.A. Contact_Voice_Telephone: (303)202-4700 Contact_Facsimile_Telephone (303)202-4188 Contact_Instructions: (Contact via email) Contact_Electronic_Mail_Address: (distributor email) Distribution_Liability: The U.S. Geological Survey (USGS) provides these geographic data "as is." The USGS makes no guarantee or warranty concerning the accuracy of information contained in the geographic data. The USGS further makes no warranties, either expressed or implied, as to any other matter whatsoever, including, without limitation, the condition of the product, or its fitness for any particular purpose. The burden for determining fitness for use lies entirely with the user. Although these data have been processed successfully on computers at the USGS, no warranty, expressed or implied, is made by the USGS regarding the use of these data on any other system, nor does the fact of distribution constitute or imply any such warranty. In no event shall the USGS have any liability whatsoever for payment of any consequential, incidental, indirect, special, or tort damages of any kind, including, but not limited to, any loss of profits arising out of use of or reliance on the geographic data or arising out of the delivery, installation, operation, or support by USGS. This digital geologic map database of the Tucson and Nogales 1:250,000-scale quadrangles, AZ, is not meant to be used or displayed at any scale larger than 1:250,000 (for example 1:100,000 or 1:24,000). Metadata_Reference_Information: Metadata_Date: 20000927 Metadata_Review_Date: 20001001 Metadata_Future_Review_Date: 20001002 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: G. Stephen Pitts Contact_Position: GIS Lab coordinator Contact_Address: Address_Type: (mailing and physical address) Address: 520 N. Park Ave, Suite 355 City: Tucson State_or_Province: Arizona Postal_Code: 85719 Country: USA Contact_Voice_Telephone: 520.670.5511 Contact_Facsimile_Telephone: 520.670.5571 Contact_Electronic_Mail_Address: bear@usgs.gov Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998 Metadata_Access_Constraints: none Metadata_Use_Constraints: none