BasemapScanmaps_TOPO24KDRG

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Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: USGS and VCGI
Publication_Date: 20031101
Publication_Time: unknown
Title: BasemapScanmaps_TOPO24KDRG
Edition: 2003
Geospatial_Data_Presentation_Form: raster digital data
Series_Information:
Series_Name: Vermont USGS Topographic Maps (1:24,000 edition)
Issue_Identification: 2003
Publication_Information:
Publication_Place: Waterbury VT 05676
Publisher: VT Center for Geographic Information
Other_Citation_Details: Tile Structure - QUAD
Online_Linkage:
<http://vcgi.vermont.gov/warehouse/?layer=BasemapScanmaps_TOPO24KDRG>
Online_Linkage:
<http://vcgi.vermont.gov/warehouse/?layer=BasemapScanmaps_TOPO24KDRG&mapit=yes>
Description:
Abstract:
The Vermont Topographic Maps product (TOPOVT24K) is a raster image of a scanned USGS 1:24000 (1:25000) topographic map excluding the collar information, georeferenced to the Vermont State Plane Coordinate System (NAD83). TOPOVT24K's were created from USGS DRG (Digital Raster Graphic) image files (24K and 25K).
Purpose:
A TOPOVT24K is useful as a source or background layer in a GIS, as a means to perform quality assurance on other digital products, and as a source for the collection and revision of DLG data. TOPOVT24K's can also be merged with other digital data, e.g. DEM's or DOQ's, to produce a hybrid digital file.
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: Various
Time_of_Day: Unknown
Currentness_Reference: Calendar Date
Status:
Progress: Complete
Maintenance_and_Update_Frequency: Unknown
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -73.454162
East_Bounding_Coordinate: -71.465281
North_Bounding_Coordinate: 45.018361
South_Bounding_Coordinate: 42.722789
Keywords:
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: imageryBaseMapsEarthCover
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: usgs topo
Theme_Keyword: topographic map
Theme_Keyword: topo map
Theme_Keyword: drg
Place:
Place_Keyword_Thesaurus: None
Place_Keyword: Vermont
Access_Constraints:
VCGI and the State of VT make no representations of any kind, including but not limited to the warranties of merchantability or fitness for a particular use, nor are any such warranties to be implied with respect to the data.
Use_Constraints: None.
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: VT Center for Geographic Information
Contact_Address:
Address_Type: Mailing and Physical Address
Address: 58 South Main Street, Suite 2
City: Waterbury
State_or_Province: VT
Postal_Code: 05676
Country: USA
Contact_Voice_Telephone: 802/882-3000
Contact_TDD/TTY_Telephone: None
Contact_Facsimile_Telephone: 802/882-3001
Contact_Electronic_Mail_Address: info@vcgi.org
Hours_of_Service: 9am - 5pm, M-F
Data_Set_Credit: <add something here>
Security_Information:
Security_Classification_System: N/A
Security_Classification: Unclassified
Security_Handling_Description: No Security Considerations
Native_Data_Set_Environment: Arc/Info
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report: Consistent with USGS 1:24000/25000 standards
Quantitative_Attribute_Accuracy_Assessment:
Attribute_Accuracy_Value: Consistent with USGS 1:24000/25000 standards
Attribute_Accuracy_Explanation: USGS Standards
Logical_Consistency_Report: Not Applicable
Completeness_Report:
This DRG is a faithfully reproduced digital image of the revised source map. Some differences may be detected between the source graphic used and the DRG. The intent is to recreate those colors as closely as possible. Data completeness for DRG files reflects 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 Standards for 1:24,000-Scale Digital Line Graphs and Quadrangle Maps, Parts 1-4, 6-7, and 9-10, National Mapping Program Technical Instructions, U.S. Geological Survey, 2001; Standards for 1:24,000-Scale Digital Line Graphs and Quadrangle Maps, Part 5 and Part 8, National Mapping Program Technical Instructions, U.S. Geological Survey, 1996; Standards for Digital Line Graphs, National Mapping Program Technical Instructions, U.S. Geological Survey, 1999; and Standards for Revised Primary Series Quadrangle Maps, National Mapping Program Technical Instructions U.S. Geological Survey, 2001. VCGI's conversion of DRGs included removal of map collars, re-projection to Vermont State Plane Coordinate System (NAD83), and "merging" with adjacent tiles to create "seamless" images. NOTE: Every effort was made to minimize "sliver" problems between adjoining images. However, these problems do exist, and is one of the constraints of this dataset. VCGI is not responsible for problems in the original DRG or "sliver" problems created during edge-matching.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report: None available
Quantitative_Horizontal_Positional_Accuracy_Assessment:
Horizontal_Positional_Accuracy_Value: 0.000
Horizontal_Positional_Accuracy_Explanation: Fuzzy Tolerance
Quantitative_Horizontal_Positional_Accuracy_Assessment:
Horizontal_Positional_Accuracy_Value: 0.00
Horizontal_Positional_Accuracy_Explanation: Dangle
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator: USGS
Publication_Date: 20021227
Publication_Time: unknown
Title: BERLIN NY-MA-VT DRG
Geospatial_Data_Presentation_Form: map
Series_Information:
Series_Name: USGS Topographic Maps 7.5 and 15 minute
Publication_Information:
Publication_Place: Reston, VA
Publisher: USGS
Other_Citation_Details: USGS DRG
Online_Linkage: <http://www.usgs.gov>
Source_Scale_Denominator: 25000
Type_of_Source_Media: paper
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 20010701
Time_of_Day: Unknown
Source_Currentness_Reference: Publication Date
Source_Citation_Abbreviation: USGS DRG
Source_Contribution: The source map is scanned to produce the DRG.
Process_Step:
Process_Description:
The production procedures, instrumentation, hardware, and software used in the collection of new version DRG's may vary depending on systems used at the contract, cooperator or U.S. Geological Survey production sites. The majority of DRG data sets are acquired through government partnerships and contracts. The process step describes, in general, the method used at a typical USGS production site to produce new version DRG's derived from scanning, georeferencing, and GeoTIFF conversion of a recently revised USGS topographic map.
1. Production of this new version DRG begins with the scanning of a recently revised paper topographic map (map1) on a high-resolution scanner. Scanning resolutions range from 500 - 1000 dpi. Some colors may be combined to enhance image appearance.
2. The raw scan file is converted to a Tagged Image File Format(TIFF) and the file size is reduced by converting the file to a PackBits compressed image.
3. The color palette of the compressed DRG may be standardized by replacing the original RGB values assigned during the scanning process with standard RGB value combinations.
4. The TIFF is georeferenced using coordinates of the map graticule ticks. Each tick is visited and assigned its respective coordinates which are stored in a ground control file. Geographic transformation software is then used to produce a georeferenced TIFF.
5. The PackBits compressed TIFF is then converted to a GeoTIFF DRG.
6. Prior to archiving the DRG undergoes the following quality assurance procedures:
a. All DRG files are inspected to ensure that they are geometrically consistent with normal map presentation.
b. Each DRG is 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.
c. Each DRG is checked for georeferencing accuracy by comparing the book value of latitude and longitude tick marks with corresponding tick intersections in the DRG image.
d. GeoTIFF header records in each DRG are checked for completeness and accuracy.
Current USGS DRG Standards, including product specifications are available via World Wide Web at:
<http://mapping.usgs.gov/standards>
DRG Standards and specifications can also be obtained from any of the regional USGS Earth Science Information Center (ESIC) offices or by telephone request at 1 888 ASK USGS.
7. VCGI PROCESSING: VCGI processing the orginal DRGs into the TOPOVT24K product format as follows: a. Converted DRG TIFF files to Arc/Info GRID format b. Removed map collars be cropping to vector polygon boundaries captured from LAT/LONG coordinates for USGS quadrangles. Used Arc/Info GRID "selectpolygon" command. c. Used Arc/Info PROJECT command to re-project from UTM NAD27 to Vermont State Plane NAD83 d. Used Arc/Info GRID "merge" function to merge with adjoining DRG TIFF quads to fill NODATA slivers.
Process_Step:
Process_Description:
Posted TOPOVT24K online for download. Discontinued TOPOVT24K CD product.
Process_Date: 20100414
Process_Time: Unknown
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Steve Sharp
Contact_Organization: VCGI
Contact_Position: GIS Database Administrator
Spatial_Data_Organization_Information:
Indirect_Spatial_Reference: RASTER
Direct_Spatial_Reference_Method: Raster
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Grid_Coordinate_System:
Grid_Coordinate_System_Name: State Plane Coordinate System
State_Plane_Coordinate_System:
SPCS_Zone_Identifier: 4400
Transverse_Mercator:
Scale_Factor_at_Central_Meridian: 0.999964
Longitude_of_Central_Meridian: -72.500000
False_Easting: 500000.000000
False_Northing: 0.000000
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:
Abscissa_Resolution: 0.001
Ordinate_Resolution: 0.001
Planar_Distance_Units: Meters
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1983
Ellipsoid_Name: Geodetic Reference System 80
Semi-major_Axis: 6378137
Denominator_of_Flattening_Ratio: 1 / 298.25722210
Entity_and_Attribute_Information:
Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: VT Center for Geographic Information
Contact_Address:
Address_Type: Mailing and Physical Address
Address: 58 South Main Street, Suite 2
City: Waterbury
State_or_Province: VT
Postal_Code: 05676
Country: USA
Contact_Voice_Telephone: 802/882-3000
Contact_TDD/TTY_Telephone: None
Contact_Facsimile_Telephone: 802/882-3001
Contact_Electronic_Mail_Address: info@vcgi.org
Hours_of_Service: 9am - 5pm, M-F
Resource_Description: BasemapScanmaps_TOPO24KDRG
Distribution_Liability:
VCGI and the State of Vermont make no representations of any kind, including but not limited to the warranties of merchantability or fitness for a particular use, nor are any such warranties to be implied with respect to the data.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: SHP
Format_Specification: ESRI Shapefile format (compressed into ZIP file format)
Format_Information_Content: geospatial data
File_Decompression_Technique: ZIP extraction tool
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
<http://vcgi.vermont.gov/warehouse/?layer=BasemapScanmaps_TOPO24KDRG>
Access_Instructions: Download from web site.
Offline_Option:
Offline_Media: CD-ROM
Offline_Option:
Offline_Media: DVD
Fees:
No charge when downloading from the internet, and when no custom processing is required.
Ordering_Instructions:
Download from web site or mail-fax a copy of the VCGI 'Data Request Form' which is available from the VGIS web site <http://vcgi.vermont.gov/warehouse/order_forms>
Turnaround: About 5 days.
Custom_Order_Process:
Mail or Fax a copy of the VCGI 'Data Request Form' which is available from <http://vcgi.vermont.gov/warehouse/order_forms>
Technical_Prerequisites: ESRI Arc/Info, ArcView, or ArcExplorer software.
Available_Time_Period:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 20100414
Time_of_Day: Unknown
Metadata_Reference_Information:
Metadata_Date: 20100414
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: VT Center for Geographic Information
Contact_Person: GIS Database Administrator
Contact_Address:
Address_Type: Mailing and Physical Address
Address: 58 South Main Street, Suite 2
City: Waterbury
State_or_Province: VT
Postal_Code: 05676
Country: USA
Contact_Voice_Telephone: 802/882-3000
Contact_TDD/TTY_Telephone: None
Contact_Facsimile_Telephone: 802/882-3001
Metadata_Standard_Name: FGDC Content Standards for Digital Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: Local time
Metadata_Access_Constraints: None
Metadata_Use_Constraints: None
Metadata_Security_Information:
Metadata_Security_Classification_System: N/A
Metadata_Security_Classification: Unclassified
Metadata_Security_Handling_Description: No security considerations
Generated by mp version 2.9.5 on Wed Apr 14 09:00:58 2010