Identification_Information:
  Citation:
    Citation_Information:
      Originator: David K. Brezinski and Robert D. Conkwright
      Publication_Date: 07/30/2013
      Publication_Time: Unknown
      Title: Geologic and Karst Features Map of the Hagerstown Quadrangle, Washington County, Maryland
      Edition: HAGER2013.1
      Geospatial_Data_Presentation_Form: vector digital data
      Online_Linkage: http:\\www.mgs.md.gov
  Description:
    Abstract:
      This ArcGIS geodatabase contains the GIS components used to create the "Geologic and Karst Features Map of the Hagerstown Quadrangle, Washington County, Maryland", by David K. Brezinski.  Geologic field mapping in the quadrangle was conducted in 2010-2011 by David K. Brezinski.  Index maps and descriptions of geologic features are included.  The map was compiled at a scale of 1:24,000 (1 inch = 2,000 feet).  Data are projected in the Maryland State Plane Coordinate System of 1983 (meters).
      The geodatabase contains feature data sets used to construct the bedrock geology, surface geology, cross-section geology, and karst features components of the quadrangle map.  The geodatabase structure is based on the ESRI Geologic Mapping Template available for download from ESRI.  The feature class attributes, labels and representations are based on the Federal Geographic Data Committee FGDC Document Number FGDC-STD-013-2006 (FGDC Digital Cartographic Standard for Geologic Map Symbolization).  The database structure and attributes have been adjusted to meet the needs of this mapping project.
    Purpose:
      This map area is included in an investigation of karst development in the Hagerstown Valley.  The karst investigation was conducted by the Maryland Geological Survey as part of a collaborative effort with the Maryland State Highway Administration and the STATEMAP component of the National Cooperative Geologic Mapping Project.
      These data are fundamental to planning and management of highways and general construction which potentially are adversely affected by hazardous geologic processes such as solutional karst features, landslides and flooding.
    Supplemental_Information:
      The base map used for this project is contained in a raster graphic file separate from the geodatabase.  The base map was derived from the USGS US Topo (PDF format) Hagerstown, MD-PA digital quadrangle (2011).  The base map contains contours, surface water features, cultural and transportation features, and political boundaries.
      A feature class for major surface water features was derived from the USGS National Hydrography Dataset (2009) for display purposes.  These features are included in the geodatabase and are overlaid on the raster base map.
      The geologic components were originally drafted onto stable-base material using the corresponding U.S. Geological Survey (USGS) topographic quadrangle map as a base (1:24,000 ).  The digital geologic map was developed for geographic information systems (GIS) using ESRI's ArcGIS Desktop 9.3.1 software.  The geologic map is produced in the Maryland State Plane Coordinate System (Lambert conformal conic projection, NAD83, meters).
      The components of the digital geologic map are divided into separate data feature classes for bedrock geology, surficial Quaternary deposits, structural line features (e.g., faults), structural point features (e.g., bedding measurements), and geologic cross-section elements.  File-specific metadata is provided with each file.  The geodatabase structure is based on the ESRI Geologic Mapping Template available for download from ESRI.  Supplemental tables which were included in the ESRI Geologic Mapping Template Geodatabase are included for completeness.  Not all tabular information in the original template is relevant or was used in the assembly of this geodatabase.
  Time_Period_of_Content:
    Time_Period_Information:
      Range_of_Dates/Times:
        Beginning_Date: 2010
        Beginning_Time: unknown
        Ending_Date: 2011
        Ending_Time: unknown
    Currentness_Reference: ground condition
  Status:
    Progress: Complete
    Maintenance_and_Update_Frequency: As needed
  Spatial_Domain:
    Bounding_Coordinates:
      West_Bounding_Coordinate: -77.751044
      East_Bounding_Coordinate: -77.623573
      North_Bounding_Coordinate: 39.721971
      South_Bounding_Coordinate: 39.623984
  Keywords:
    Theme:
      Theme_Keyword_Thesaurus: none
      Theme_Keyword: geologic map, geology, karst, bedrock, surficial, structural
    Place:
      Place_Keyword_Thesaurus: none
      Place_Keyword: Hagerstown, Maryland, Hagerstown Valley
  Access_Constraints: none
  Use_Constraints: These data represent the results of data collection/processing for a specific Department of Natural Resources, Maryland Geological Survey activity and indicate general existing conditions.  As such, they are only valid for the intended use, content, time, and accuracy specification.  The user is responsible for the results of any application of the data for other than their intended purpose.  The Department of Natural Resources, Maryland Geological Survey makes no warranty, expressed or implied, as to the use or appropriateness of the data, and there are no warranties of merchantability or fitness for a particular purpose of use.  The Maryland Geological Survey makes no representation to the accuracy or completeness of the data and may not be held liable for human error or defect.  Data are only valid at a scale of 1:24,000.  Data should not be used at a scale greater than that.  By using the data, you signify that you have read the use constraints and accept its terms.  Acknowledgement of the Maryland Geological Survey and credit to the originator(s)/author(s) are expected in products derived from this data.
  Point_of_Contact:
    Contact_Information:
      Contact_Person_Primary:
        Contact_Person: Robert D. Conkwright
        Contact_Organization: Maryland Geological Survey
      Contact_Position: Geologist
      Contact_Address:
        Address_Type: mailing and physical address
        Address: 2300 St. Paul Street
        City: Baltimore
        State_or_Province: MD
        Postal_Code: 21218
        Country: USA
      Contact_Voice_Telephone: 410 554-5545
      Contact_Electronic_Mail_Address: bconkwright@dnr.state.md.us
      Hours_of_Service: 8:00am - 4:30pm EST
  Data_Set_Credit: Produced by Maryland Geological Survey, Department of Natural Resources.  Production of this digital geologic map was funded in part by the Maryland State Highway Administration and the STATEMAP component of the National Cooperative Geologic Mapping Project.
  Native_Data_Set_Environment: Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcCatalog 9.3.1.1850
Data_Quality_Information:
  Attribute_Accuracy:
    Attribute_Accuracy_Report: The geologic map was hand drawn on stable-base film (e.g., Mylar) at a scale of 1:24,000 by the principal geologist based on standard geologic mapping techniques, which involve the integration and interpretation of field observations and available subsurface data (e.g., drilling logs, geophysical logs). The hand-drawn map includes geologic contact lines and coded labels for the geologic map units.  Digital attributes were assigned during the creation of the geology layer in ESRI ArcGIS Desktop.  Each polygon has a unit label attribute designating the mapped geologic unit provided by the principal geologist or MGS GIS project coordinator/editor.  Additional polygon attributes for the digital files were provided by the MGS GIS project coordinator.  Feature attributes were then verified visually in the ArcInfo attribute tables; attributes linked to map layout components were verified visually on the map both in print and symbolized display on-screen.  Maryland Geological Survey performs quality assurance on the digital vector file by comparison of the digital data files and map to the original films. Selected attributes that cannot be visually verified on plots or on screen are interactively queried and verified on screen by the GIS project coordinator and GIS specialist
  Logical_Consistency_Report: Map elements were visually checked for overshoots, undershoots, duplicate features, polygon closure and other errors by the GIS project coordinator and GIS specialist(s) who created the digital data. Hard copy prints of the map were reviewed by the MGS geologists for consistency with basic geologic principles and general conformity to mapping standards.  The graphic data has been tested for consistency through the application of ArcGIS topologic testing.  Polylines and polygons were tested to a 0.001 tolerance for overlap or gaps between line features and adjacent geologic formation polygons.
  Completeness_Report: Updates may occur as needed or as additional data become available. Check MGS website for version number or contact MGS Publications Office (see Distribution_Information).  Data are complete based on compilation at 1:24,000 scale.
  Positional_Accuracy:
    Horizontal_Positional_Accuracy:
      Horizontal_Positional_Accuracy_Report: Horizontal accuracy of the digital vector file was tested by comparing proof plots with original map prepared by the principal geologist(s) at a scale of 1:24000. The comparison was done visually by MGS geologists and the GIS team.  Some corrections/adjustments to contact locations were made per instruction of the principal geologist directly in the digital form.  The difference in positional accuracy between the geologic unit contacts as drawn and digitized and the contacts in the field is difficult to quantify in geologic mapping of this type.  Where a contact between two bedrock units is concealed by a mappable thickness of overlying Quaternary materials (e.g., alluvium, colluvium, residuum, terrace deposits or artificial fill) the location is an estimate indicated by a dotted line on the map (attributed as "concealed" in the arc attribute table in coverage).  Where a bedrock contact is not concealed by mappable Quaternary deposits, the certainty of a contact's location may vary because many bedrock contacts are not exposed everywhere (they are often covered by soils and/or vegetation in places).  In these situations the location certainty/accuracy of geologic contacts has been designated by the principal geologist as accurate (symbolized by a solid line), approximate (a long dash pattern), or inferred (a short dash pattern).
  Lineage:
    Source_Information:
      Source_Citation:
        Citation_Information:
          Originator: David K. Brezinski
          Publication_Date: Unpublished Material
          Publication_Time: Unknown
          Title: Draft of the geologic map of the Hagerstown Quadrangle, Washington County, Maryland
          Geospatial_Data_Presentation_Form: raster digital data
      Source_Scale_Denominator: 24000
      Type_of_Source_Media: stable-base material
      Source_Time_Period_of_Content:
        Time_Period_Information:
          Range_of_Dates/Times:
            Beginning_Date: 2010
            Ending_Date: 2011
            Ending_Time: unknown
        Source_Currentness_Reference: ground condition
      Source_Citation_Abbreviation: Maryland Geological Survey
      Source_Contribution: US Geological Survey, Maryland State Highways Administration
    Process_Step:
      Process_Description: The geology was compiled onto stable-base film, using the USGS 0.007-inch-thick film positives of the 7.5-minute topographic maps as an underlying stable base.  Original scale of map is 1:24,000 (1 inch equals 2,000 feet).  Eight spatial reference points (4 quadrangle corners and 4 internal reference marks) were added to the geology film for georeferencing purposes.
      Source_Used_Citation_Abbreviation: Draft of the geologic map of the Hagerstown Quadrangle, Washington County, Maryland
      Process_Date: Unknown
    Process_Step:
      Process_Description: The geology film separate was scanned at 300 dpi in TIFF format.
      Process_Date: Unknown
    Process_Step:
      Process_Description: The scanned TIFF image was brought into ESRI ArcGIS Desktop software and georeferenced (or registered and rectified) to UTM 18N (North American Datum 1983 US meters).  Eight spatial reference points were used as linking points.  When rectifying, nearest neighbor interpolation at a polynomial of 3 was used and attempts were made to achieve the lowest root mean square (RMS) error possible, which for the structural point layer was approximately 0.0002.  NOTE: this RMS error is reported in geospatial units of the projection, which at this point are feet.  (RMS error is not reported in digitizer inches or physical map inches or millimeters.)
      Process_Date: Unknown
    Process_Step:
      Process_Description: The image was re-projected to the current Maryland State Plane Coordinate System FIPS 1900, (North American Datum 1983, Lambert Conformal Conic Projection, meters) using the nearest neighbor resampling technique and default output cell size (x=1.0389225, y=1.0389224).
      Process_Date: Unknown
    Process_Step:
      Process_Description: The raster data were vectorized using ArcScan via a combination of semi-automated and manual digitizing techniques.  The data were entered into the ESRI Geologic Mapping Template geodatabase.  Attributes were assigned at digitizing time.
      Source_Used_Citation_Abbreviation: ESRI Geologic Mapping Template
      Process_Date: Unknown
    Process_Step:
      Process_Description: The digitized geologic features were reviewed and edited by geologists at the Maryland Geologic Survey (MGS) using scanned images of source data, digital base files, and field records.
      Process_Date: Unknown
    Process_Step:
      Process_Description: Topologies were constructed for polygon and polyline features in ArcGIS Catalog 9.3.1.  Rule to ensure no gaps and no overlaps to within a 0.001 m tolerance were present were used.
      Process_Date: Unknown
    Process_Step:
      Process_Description: The topologies were imported into ArcMap 9.3.1 and overlaid on the original digitized data.  Topologic errors were edited and corrected in the digitized data.
      Process_Date: Unknown
    Process_Step:
      Process_Description: The bedrock and surficial polygon feature classes was attributed with the corresponding geologic units by MGS geologists.  Geologic contact lines were attributed for general type and certainty of identity and location.
      Process_Date: Unknown
    Process_Step:
      Process_Description: Additional components of the feature class attributes were added and joins to attribute tables were executed as needed.  Spatial and attribute data along with other geospatial data for the map were reviewed and edited by project geologists and GIS specialists.
      Process_Date: Unknown
    Process_Step:
      Process_Description: The final map was composed in the layout function of ArcMap, using colors and symbols derived from the project geologists and the FGDC Digital Cartographic Standard for Geologic Map Symbolization.  Annotation for select map components was developed.  A PDF version of this entire map layout was prepared for release to the public.
      Source_Used_Citation_Abbreviation: Federal Geographic Data Committee FGDC Document Number FGDC-STD-013-2006 (FGDC Digital Cartographic Standard for Geologic Map Symbolization)
Spatial_Data_Organization_Information:
  Direct_Spatial_Reference_Method: Vector
Spatial_Reference_Information:
  Horizontal_Coordinate_System_Definition:
    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: CrossSection
      Entity_Type_Definition: Feature dataset contains data features used to construct the geologic map cross section
  Detailed_Description:
    Entity_Type:
      Entity_Type_Label: GeologicMap
      Entity_Type_Definition: Feature dataset containing point, polyline, polygon and annotation feature classes used to construct the geologic map layer
  Detailed_Description:
    Entity_Type:
      Entity_Type_Label: MapElements
      Entity_Type_Definition: Feature dataset containing supporting data tables containing descriptions and definitions of geologic units, map representations and annotation rules
  Overview_Description:
Metadata_Reference_Information:
  Metadata_Date: 20130806
