USGS NED ned19_n44x75_w073x50_vt_chittenden_2005 1/9 arc-second 2009 15 x 15 minute IMG

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Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: U.S. Geological Survey
Publication_Date: 2009
Title:
USGS NED ned19_n44x75_w073x50_vt_chittenden_2005 1/9 arc-second 2009 15 x 15 minute IMG
Geospatial_Data_Presentation_Form: raster digital data
Publication_Information:
Publication_Place: Reston, VA
Publisher: U.S. Geological Survey
Online_Linkage: <http://ned.usgs.gov/>
Online_Linkage: <http://nationalmap.gov/viewer.html>
Description:
Abstract:
This tile of the National Elevation Dataset (NED) is 1/9 arc-second resolution. The National Elevation Dataset (NED) serves the elevation layer of The National Map, and provides basic elevation information for earth science studies and mapping applications in the United States. Scientists and resource managers use NED data for global change research, hydrologic modeling, resource monitoring, mapping and visualization, and many other applications. The NED is an elevation dataset that consists of seamless layers and a high resolution layer. Each of these layers are composed of the best available raster elevation data of the conterminous United States, Alaska, Hawaii, territorial islands, Mexico and Canada. The NED is updated continually as new data become available. All NED data are in the public domain. The NED are derived from diverse source data that are processed to a common coordinate system and unit of vertical measure. These data are distributed in geographic coordinates in units of decimal degrees, and in conformance with the North American Datum of 1983 (NAD 83). All elevation values are in meters and, over the continental United States, are referenced to the North American Vertical Datum of 1988 (NAVD 88). The vertical reference will vary in other areas. NED data are available nationally (except for Alaska) at resolutions of 1 arc-second (approx. 30 meters) and 1/3 arc-second (approx. 10 meters), and in limited areas at 1/9 arc-second (approx. 3 meters). In most of Alaska, only lower resolution source data are available. As a result, most NED data for Alaska are at 2-arc-second (approx. 60 meters) grid spacing. Part of Alaska is available at the 1- and 1/3-arc-second resolution from IFSAR collections starting in 2010. Plans are in place for collection of statewide IFSAR in Alaska through 2016.
Purpose:
The NED serves as the elevation layer of The National Map, and provides basic elevation information for earth science studies and mapping applications in the United States. The data are utilized by the scientific and resource management communities for global change research, hydrologic modeling, resource monitoring, mapping and visualization applications.
Supplemental_Information:
This tile of the National Elevation Dataset (NED) is 1/9 arc-second resolution, Image file format, and covers a one degree block. The geographic area of coverage is described below in the Bounding Coordinates. Additional information for the NED may be found on <http://ned.usgs.gov/>. Data may be downloaded through The National Map Viewer: <http://nationalmap.gov/viewer.html>. Direct links for direct access by automated services are provided in the Distribution section of this metadata.
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 20050131
Currentness_Reference: publication date
Status:
Progress: Complete
Maintenance_and_Update_Frequency: As Needed
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -73.500185185185217
East_Bounding_Coordinate: -73.24981481481484
North_Bounding_Coordinate: 44.750185185185188
South_Bounding_Coordinate: 44.499814814814819
Keywords:
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: elevation
Theme:
Theme_Keyword_Thesaurus: NGDA Portfolio Themes
Theme_Keyword: Elevation
Theme:
Theme_Keyword_Thesaurus: National Elevation Dataset (NED)
Theme_Keyword: National Elevation Dataset
Theme_Keyword: NED
Theme_Keyword: Elevation
Theme_Keyword: Grid
Theme_Keyword: LIght Detection And Ranging
Theme_Keyword: LIDAR
Theme_Keyword: Interferometric Synthetic Aperture Radar
Theme_Keyword: IFSAR
Theme_Keyword: High Resolution
Theme_Keyword: Topographic Surface
Theme_Keyword: Topography
Theme_Keyword: Bare Earth
Theme_Keyword: Hydro-Flattened
Theme_Keyword: Terrain Elevation
Theme_Keyword: 15-minute DEM
Theme_Keyword: 1/9 arc-second DEM
Theme_Keyword: Cartography
Theme_Keyword: DEM
Theme_Keyword: Digital Elevation Model
Theme_Keyword: Digital Mapping
Theme_Keyword: Digital Terrain Model
Theme_Keyword: Geodata
Theme_Keyword: GIS
Theme_Keyword: Mapping
Theme_Keyword: Raster
Theme_Keyword: USGS
Theme_Keyword: U.S. Geological Survey
Place:
Place_Keyword_Thesaurus: Geographic Names Information System
Place_Keyword: US
Place_Keyword: United States
Access_Constraints:
None. Any downloading and use of these data signifies a user's agreement to comprehension and compliance of the USGS Standard Disclaimer. Insure all portions of metadata are read and clearly understood before using these data in order to protect both user and USGS interests.
Use_Constraints:
There is no guarantee or warranty concerning the accuracy of the data. Users should be aware that temporal changes may have occurred since these data were collected and that some parts of these data may no longer represent actual surface conditions. Users should not use these data for critical applications without a full awareness of its limitations. Acknowledgement of the originating agencies would be appreciated in products derived from these data. Any user who modifies the data is obligated to describe the types of modifications they perform. User specifically agrees not to misrepresent the data, nor to imply that changes made were approved or endorsed by the USGS. Please refer to <http://www.usgs.gov/privacy.html> for the USGS disclaimer.
Browse_Graphic:
Browse_Graphic_File_Name:
<ftp://rockyftp.cr.usgs.gov/vdelivery/Datasets/Staged/NED/19/IMG/ned19_n44x75_w073x50_vt_chittenden_2005_thumb.jpg>
Browse_Graphic_File_Description: Thumbnail JPG image
Browse_Graphic_File_Type: JPEG
Data_Set_Credit:
Acknowledgement of the originating agencies would be appreciated in products derived from these data.
Data_Quality_Information:
Logical_Consistency_Report:
See original source metadata link at the end of the Metadata Reference Information section for details.
Completeness_Report: N/A
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report: N/A
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report: N/A
Lineage:
Process_Step:
Process_Description:
USGS NED ned19_n44x75_w073x50_vt_chittenden_2005 1/9 arc-second 2009 15 x 15 minute IMG. "EarthData has developed a unique method for processing lidar data to identify and remove elevation points falling on vegetation, buildings, and other aboveground structures. The algorithms for filtering data were utilized within EarthData's proprietary software and commercial software written by TerraSolid. This software suite of tools provides efficient processing for small to large-scale, projects and has been incorporated into ISO 9001 compliant production work flows. The following is a step-by-step breakdown of the process. 1. Using the lidar data set provided by EarthData, the technician performs calibrations on the data set. 2. After calibrating the lidar data set, the technician performed a visual inspection of the data to verify that the flight lines overlap correctly. The technician also verified that there were no voids, and that the data covered the project limits. The technician then selected a series of areas from the dataset and inspected them where adjacent flight lines overlapped. These overlapping areas were merged and a process which utilizes 3-D Analyst and EarthData's proprietary software was run to detect and color code the differences in elevation values and profiles. The technician reviewed these plots and located the areas that contained systematic errors or distortions that were introduced by the lidar sensor. 3. Systematic distortions highlighted in step 2 were removed and the data were re-inspected. Corrections and adjustments can involve the application of angular deflection or compensation for curvature of the ground surface that can be introduced by crossing from one type of land cover to another. 4. The lidar data for each flight line was trimmed in batch for the removal of the overlap areas between flight lines. The data was checked against a control network to ensure that vertical requirements were maintained. Conversion to the client-specified datum and projections was then completed. The lidar flight line data sets were then segmented into adjoining tiles for batch processing and data management. 5. The initial batch-processing run removed 95% of points falling on vegetation. The algorithm also removed the points that fell on the edge of hard features such as structures, elevated roadways and bridges. 6. The operator interactively processed the data using lidar editing tools. During this final phase the operator generated a TIN based on a desired thematic layers to evaluate the automated classification performed in step 5. This allowed the operator to quickly re-classify points from one layer to another and recreate the TIN surface to see the effects of edits. Geo-referenced images were toggled on or off to aid the operator in identifying problem areas. The data was also examined with an automated profiling tool to aid the operator in the reclassification. 6.The data was separated into a bare-earth DEM. A grid-fill program was used to fill data voids caused by reflective objects such as buildings and vegetation. The final DEM was written to an ASCII XYZ and LAS format. 7. The reflective surface data were also delivered in ASCII XYZ and LAS format. 8. Final TIN files are created and delivered." Information in quotation marks is from the original metadataMetadata was created for display through The National Map Viewer at <http://nationalmap.gov> in XML and HTML format.
Source_Used_Citation_Abbreviation: LIDAR Processing
Process_Date: 20041220
Source_Produced_Citation_Abbreviation: LIDAR
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Address:
Address_Type: mailing and physical address
Address: USGS National Geospatial Program Office
Address: 12201 Sunrise Valley Drive
City: Reston
State_or_Province: VA
Postal_Code: 20192
Country: USA
Contact_Voice_Telephone: 1-888-ASK-USGS (1-888-275-8747)
Hours_of_Service: 0800 - 1600 CT, M - F (-6h CST/-5h CDT GMT)
Contact_Instructions: Please visit <http://www.usgs.gov/ask/> to contact us.
Process_Step:
Process_Description:
At EROS, the Chittenden County, Vermont, data were processed into a NED 1/9th dataset using ESRI software. The original 26 tiles of float data had been converted to Arc grids. The Single Output Map Algebra Arc tool was used to eliminate nodata areas with values of -32000. The Z unit for two of tiles were changed from centimeter to meter. All the tiles were reprojected from Geographic Decimal Seconds NAD83 to Geographic Decimal Degrees NAD83. The grids were mosaicked together, and shaded-relief and area footprints were generated. Data QC was performed by reviewing the hill shades to detect irregularities in the data. The data were then loaded into ArcSDE to be made available for public access download. Metadata was created for display through The National Map Seamless Server at <http://seamless.usgs.gov>, and is available in several formats: HTML, TEXT, XML, FAQ and SGML.
Process_Date: 2009
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Position: Customer Service Representative
Contact_Address:
Address_Type: mailing and physical address
Address: USGS Earth Resources Observation & Science (EROS) Center
Address: 47914 252nd Street
City: Sioux Falls
State_or_Province: SD
Postal_Code: 57198-0001
Country: USA
Contact_Voice_Telephone: 605-594-6151
Contact_Voice_Telephone: 1-800-252-4547
Contact_TDD/TTY_Telephone: 605-594-6933
Contact_Facsimile_Telephone: 605-594-6589
Contact_Electronic_Mail_Address: custserv@usgs.gov
Hours_of_Service: 0800 - 1600 CT, M - F (-6h CST/-5h CDT GMT)
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Raster
Raster_Object_Information:
Raster_Object_Type: Pixel
Row_Count: 15156
Column_Count: 16286
Vertical_Count: 1
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Geographic:
Latitude_Resolution: 0.00001
Longitude_Resolution: 0.00001
Geographic_Coordinate_Units: Decimal degrees
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: 298.2572221
Vertical_Coordinate_System_Definition:
Altitude_System_Definition:
Altitude_Datum_Name: North American Vertical Datum of 1988
Altitude_Resolution: 0.001
Altitude_Distance_Units: meters
Altitude_Encoding_Method: Implicit coordinate
Entity_and_Attribute_Information:
Overview_Description:
Entity_and_Attribute_Overview: The attribute summary can be found in the data dictionary.
Entity_and_Attribute_Detail_Citation:
A link to the NED Data Dictionary describing information that is included in the spatial metadata shapefiles acquired with the DEM is provided at the end of the Metadata Section of this document.
Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Address:
Address_Type: mailing and physical
Address: USGS National Geospatial Program Office
Address: 12201 Sunrise Valley Drive
City: Reston
State_or_Province: VA
Postal_Code: 20192
Country: USA
Contact_Voice_Telephone: 1-888-ASK-USGS (1-888-275-8747)
Hours_of_Service: Monday through Friday 8:00 AM to 4:00 PM Eastern Time Zone USA
Contact_Instructions: Please visit <http://www.usgs.gov/ask/> to contact us.
Resource_Description: Downloadable Data
Distribution_Liability:
Although these data have been processed successfully on a computer system at the U.S. Geological Survey, no warranty, expressed or implied, is made by either regarding the utility of the data on any system, nor shall the act of distribution constitute any such warranty. The USGS will warranty the delivery of this product in computer-readable format and will offer appropriate adjustment of credit when the product is determined unreadable by correctly adjusted computer peripherals, or when the physical medium is delivered in damaged condition. Requests for adjustments of credit must be made within 90 days from the date of this shipment from the ordering site.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: IMG
Transfer_Size: 4.871651
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
<ftp://rockyftp.cr.usgs.gov/vdelivery/Datasets/Staged/NED/19/IMG/ned19_n44x75_w073x50_vt_chittenden_2005.zip>
Fees: NONE
Metadata_Reference_Information:
Metadata_Date: 20140211
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Address:
Address_Type: mailing and physical address
Address: USGS National Geospatial Program Office
Address: 12201 Sunrise Valley Drive
City: Reston
State_or_Province: VA
Postal_Code: 20192
Country: USA
Contact_Voice_Telephone: 1-888-ASK-USGS (1-888-275-8747)
Hours_of_Service: Monday through Friday 8:00 AM to 4:00 PM Eastern Time Zone USA
Contact_Instructions: Please visit <http://www.usgs.gov/ask/> to contact us.
Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Extensions:
Online_Linkage: <http://ned.usgs.gov/NED/metadata.asp>
Profile_Name: National Elevation Dataset (NED) Metadata
Metadata_Extensions:
Online_Linkage: <http://ned.usgs.gov/source_metadata/Chittenden_LIDAR.xml>
Profile_Name: Chittenden County LIDAR
Generated by mp version 2.9.12 on Tue Feb 11 14:59:13 2014