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  1. 1/3-Arc Second National Elevation Dataset
  2. Metadata also available as
  3.  
  4. Metadata:
  5.  
  6. Identification_Information
  7. Data_Quality_Information
  8. Spatial_Data_Organization_Information
  9. Spatial_Reference_Information
  10. Entity_and_Attribute_Information
  11. Distribution_Information
  12. Metadata_Reference_Information
  13.  
  14. Identification_Information:
  15.  
  16. Citation:
  17.  
  18. Citation_Information:
  19.  
  20. Originator: U.S. Geological Survey (USGS)
  21. Publication_Date: 2009
  22. Publication_Time: As Updated.
  23. Title:
  24. 1/3-Arc Second National Elevation Dataset
  25. Geospatial_Data_Presentation_Form: SDE raster digital data
  26. Series_Information:
  27.  
  28. Series_Name: National Elevation Data (NED)
  29. Issue_Identification: 0.1
  30.  
  31. Publication_Information:
  32.  
  33. Publication_Place: Sioux Falls, SD
  34. Publisher: U.S. Geological Survey
  35.  
  36. Online_Linkage: <http://nationalmap.gov>
  37. Online_Linkage: <http://seamless.usgs.gov>
  38.  
  39. Description:
  40.  
  41. Abstract:
  42. The National Elevation Dataset (NED) is the primary elevation data product produced and distributed by the USGS. The NED provides the best available public domain raster elevation data of the conterminous United States, Alaska, Hawaii, and territorial islands in a seamless format. The NED is derived from diverse source data, processed to a common coordinate system and unit of vertical measure. All NED 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 provided in units of meters, and are referenced to the North American Vertical Datum of 1988 (NAVD 88) over the conterminous United States. The vertical reference will vary in other areas. NED data are available nationally 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). At present, the bulk of Alaska is only available at a 2 arc-second (approx. 60 meters) resolution, owing to a lack of higher resolution source data, though some areas are available at resolutions of 1 and 1/3 arc-second with plans for significant upgrades of the state over the next five years. The NED is updated on a nominal two month cycle to integrate newly available, improved elevation source data.
  43. Purpose:
  44. 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.
  45. Supplemental_Information:
  46. The data obtained through The National Map Seamless Server is considered to be the "best available" data from the USGS. The range of dates for the NED 1-arc second data cover the inception date of the dataset to the date of the most recent update.
  47. Historical data and other data may be obtained by contacting Customer Service, Earth Resources Observation & Science (EROS) Center at 1-800-252-4547.
  48. QUADNAME RESOLUTION ULLAT ULLON LRLAT LRLON HDATUM ZMIN ZMAX ZMEAN ZSIGMA PMETHOD QUADDATE
  49. carter_dome_NH 10 44.375 -71.125 44.25 -71.25 27 255.6000061 1472.30004883 741.95257568 271.34860229 5 20010401
  50. mount_washington_NH 10 44.375 -71.25 44.25 -71.375 27 363 1916.30004883 963.980896 357.49002075 5 20010401
  51.  
  52. Time_Period_of_Content:
  53.  
  54. Time_Period_Information:
  55.  
  56. Range_of_Dates/Times:
  57.  
  58. Beginning_Date: 19990201
  59. Ending_Date: 20090201
  60.  
  61. Currentness_Reference: ground condition
  62.  
  63. Status:
  64.  
  65. Progress: In work
  66. Maintenance_and_Update_Frequency: Quarterly
  67.  
  68. Spatial_Domain:
  69.  
  70. Bounding_Coordinates:
  71.  
  72. West_Bounding_Coordinate:-71.3460185182784
  73. East_Bounding_Coordinate:-71.2319444442038
  74. North_Bounding_Coordinate:44.3490740740449
  75. South_Bounding_Coordinate:44.2979629629335
  76.  
  77. Keywords:
  78.  
  79. Theme:
  80.  
  81. Theme_Keyword_Thesaurus: National Elevation Dataset
  82. Theme_Keyword: NED
  83. Theme_Keyword: National Elevation Dataset
  84. Theme_Keyword: elevation
  85. Theme_Keyword: grid
  86. Theme_Keyword: LiDAR
  87. Theme_Keyword: Lidar
  88. Theme_Keyword: LIDAR
  89. Theme_Keyword: Light Detection And Ranging
  90. Theme_Keyword: high-resolution
  91. Theme_Keyword: topography
  92. Theme_Keyword: USGS
  93. Theme_Keyword: U.S. Geological Survey
  94. Theme_Keyword: DEM
  95. Theme_Keyword: Digital elevation model
  96. Theme_Keyword: Elevation
  97. Theme_Keyword: Digital terrain model
  98. Theme_Keyword: Surface Model
  99. Theme_Keyword: Hydrologic
  100. Theme_Keyword: Hydrologic Modeling
  101. Theme_Keyword: Drainage Area
  102. Theme_Keyword: Hydrology
  103.  
  104. Theme:
  105.  
  106. Theme_Keyword_Thesaurus:
  107. American Society of Photogrammetry and RemoteSensing
  108. Theme_Keyword: National Standards for Spatial Digital Accuracy (NSSDA)
  109.  
  110. Theme:
  111.  
  112. Theme_Keyword_Thesaurus: ISO 19115 Category
  113. Theme_Keyword: imageryBaseMapsEarthCover
  114. Theme_Keyword: 010
  115. Theme_Keyword: geoscientificInformation
  116. Theme_Keyword: 008
  117. Theme_Keyword: location
  118. Theme_Keyword: 013
  119.  
  120. Place:
  121.  
  122. Place_Keyword_Thesaurus:
  123. U.S. Department of Commerce, 1995, Countries, dependencies, areas of special sovereignty, and their principal administrative divisions, Federal Information Processing Standard 10-4,): Washington, D.C., National Institute of Standards and Technology
  124. Place_Keyword: United States
  125. Place_Keyword: U.S.
  126. Place_Keyword: US
  127. Place_Keyword: USA
  128.  
  129. Place:
  130.  
  131. Place_Keyword_Thesaurus:
  132. U.S. Department of Commerce, 1987, Codes for the identification of the States, the District of Columbia and the outlying areas of the United States, and associated areas (Federal Information Processing Standard 5-2): Washington, D.C., National Institute of Standards and Technology
  133. Place_Keyword: AK
  134. Place_Keyword: HI
  135. Place_Keyword: AS
  136. Place_Keyword: GU
  137. Place_Keyword: MH
  138. Place_Keyword: FSM (Federated States of Micronesia)
  139. Place_Keyword: MP
  140. Place_Keyword: PW
  141. Place_Keyword: PR
  142.  
  143. Place:
  144.  
  145. Place_Keyword_Thesaurus: Geographic Names Information System
  146. Place_Keyword: Alaska
  147. Place_Keyword: Hawaii
  148. Place_Keyword: American Samoa
  149. Place_Keyword: Guam
  150. Place_Keyword: Marshall Islands
  151. Place_Keyword: Micronesia
  152. Place_Keyword: Northern Mariana Islands
  153. Place_Keyword: Palau
  154. Place_Keyword: Puerto Rico
  155.  
  156. Access_Constraints:
  157. Any acquisition or use of these data signifies a user's agreement to comprehension and compliance of the USGS Standard Disclaimer. Ensure all portions of metadata are read and clearly understood before using these data in order to protect both user and USGS interests.
  158. Use_Constraints:
  159. 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.
  160. Point_of_Contact:
  161.  
  162. Contact_Information:
  163.  
  164. Contact_Organization_Primary:
  165.  
  166. Contact_Organization: U.S. Geological Survey
  167.  
  168. Contact_Position: Customer Service Representative
  169. Contact_Address:
  170.  
  171. Address_Type: mailing and physical address
  172. Address: USGS Earth Resources Observation & Science (EROS) Center
  173. Address: 47914 252nd Street
  174. City: Sioux Falls
  175. State_or_Province: SD
  176. Postal_Code: 57198-0001
  177. Country: USA
  178.  
  179. Contact_Voice_Telephone: 605-594-6151
  180. Contact_Voice_Telephone: 1-800-252-4547
  181. Contact_TDD/TTY_Telephone: 605-594-6933
  182. Contact_Facsimile_Telephone: 605-594-6589
  183. Contact_Electronic_Mail_Address: custserv@usgs.gov
  184. Hours_of_Service: 0800 - 1600 CT, M - F (-6h CST/-5h CDT GMT)
  185.  
  186. Security_Information:
  187.  
  188. Security_Classification_System: None
  189. Security_Classification: Unclassified
  190. Security_Handling_Description: None
  191.  
  192. Native_Data_Set_Environment:
  193. Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcCatalog 9.1.0.780
  194.  
  195. Data_Quality_Information:
  196.  
  197. Logical_Consistency_Report: N/A
  198. Completeness_Report: N/A
  199. Positional_Accuracy:
  200.  
  201. Horizontal_Positional_Accuracy:
  202.  
  203. Horizontal_Positional_Accuracy_Report: N/A
  204.  
  205. Vertical_Positional_Accuracy:
  206.  
  207. Vertical_Positional_Accuracy_Report: N/A
  208.  
  209. Lineage:
  210.  
  211. Process_Step:
  212.  
  213. Process_Description:
  214. NED assembly and updating are accomplished with a highly automated production process that was developed specifically for this seamless elevation data set. The selection of source data is accomplished by an automated query of a database of USGS and partner-supplied DEMs. The "best available" data criteria are applied to select specific file-based DEMs from the database. The headers of the selected DEMs are read to create an index, which controls production and triggers subsequent processing steps. Industry standard tools from the National Geodetic Survey, NADCON and VERTCON, are used to perform horizontal and vertical datum transformations, respectively.
  215. The source DEMs are projected from their native coordinate system to a geographic coordinate system (decimal degrees of latitude and longitude) using standard cartographic transformation software. Resampling of the original elevation values is done with an implementation of cubic convolution that is optimized for elevation data by maintaining the integrity of shorelines and water bodies. Artifact removal is performed on the older USGS Level 1 DEMs that were produced with photogrammetric methods. The "mean profile filter" was specifically designed to process these 7.5-minute DEMs. The filter process uses a series of directional filters to isolate the high-frequency artifacts, which are then subtracted from the DEM. The magnitude of these artifacts is small, typically less than 1 meter, so the change to the DEM is negligible, but the removal results in significant improvements in derivative elevation products, such as shaded relief, slope, and aspect
  216. The final steps in the production process include paneling the DEMs to fill the 1- by 1-degree tile, filling slivers of missing data along DEM boundaries as necessary by interpolating adjacent values, and edge matching the seams along the DEM boundaries and tile edges. The edge match algorithm uses a feathering approach that maintains local slope continuity across the seam. Finally, a shaded-relief image of the tile is generated for inspection by an analyst to verify successful processing, especially artifact filtering and edge matching. In some cases, DEM header information, which automatically triggers certain processing options, is incorrect, and the result is data that are not acceptable for inclusion into the NED. These cases are detected in the visual inspection step, the DEM header is corrected, and the tile is submitted for reprocessing. Tiles passing inspection are transferred to the next release version, and the spatially referenced metadata are updated accordingly.
  217. The metadata were created for The National Map Seamless Server at <http://seamless.usgs.gov>, and are available in several formats: HTML, TEXT, XML, FAQ and SGML.
  218. Process_Date: Ongoing
  219. Process_Contact:
  220.  
  221. Contact_Information:
  222.  
  223. Contact_Organization_Primary:
  224.  
  225. Contact_Organization: U.S. Geological Survey
  226.  
  227. Contact_Position: Customer Service Representative
  228. Contact_Address:
  229.  
  230. Address_Type: mailing and physical address
  231. Address: USGS Earth Resources Observation & Science (EROS) Center
  232. Address: 47914 252nd Street
  233. City: Sioux Falls
  234. State_or_Province: SD
  235. Postal_Code: 57198-0001
  236. Country: USA
  237.  
  238. Contact_Voice_Telephone: 605-594-6151
  239. Contact_Voice_Telephone: 1-800-252-4547
  240. Contact_TDD/TTY_Telephone: 605-594-6933
  241. Contact_Facsimile_Telephone: 605-594-6589
  242. Contact_Electronic_Mail_Address: custserv@usgs.gov
  243. Hours_of_Service: 0800 - 1600 CT, M - F (-6h CST/-5h CDT GMT)
  244.  
  245. Spatial_Data_Organization_Information:
  246.  
  247. Direct_Spatial_Reference_Method: Raster
  248. Raster_Object_Information:
  249.  
  250. Raster_Object_Type: Pixel
  251. Row_Count: 552
  252. Column_Count: 1232
  253. Vertical_Count: 1
  254.  
  255. Spatial_Reference_Information:
  256.  
  257. Horizontal_Coordinate_System_Definition:
  258.  
  259. Geographic:
  260.  
  261. Latitude_Resolution: 0.00001
  262. Longitude_Resolution: 0.00001
  263. Geographic_Coordinate_Units: Decimal degrees
  264.  
  265. Geodetic_Model:
  266.  
  267. Horizontal_Datum_Name: North American Datum of 1983
  268. Ellipsoid_Name: Geodetic Reference System 80
  269. Semi-major_Axis: 6378137.000000
  270. Denominator_of_Flattening_Ratio: 298.257222
  271.  
  272. Vertical_Coordinate_System_Definition:
  273.  
  274. Altitude_System_Definition:
  275.  
  276. Altitude_Datum_Name: North American Vertical Datum of 1988
  277. Altitude_Resolution: 1.000000
  278. Altitude_Distance_Units: meters
  279. Altitude_Encoding_Method: Implicit coordinate
  280.  
  281. Entity_and_Attribute_Information:
  282.  
  283. Overview_Description:
  284.  
  285. Entity_and_Attribute_Detail_Citation:
  286. 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.
  287.  
  288. Distribution_Information:
  289.  
  290. Distributor:
  291.  
  292. Contact_Information:
  293.  
  294. Contact_Organization_Primary:
  295.  
  296. Contact_Organization: U.S. Geological Survey
  297.  
  298. Contact_Position: Customer Service Representative
  299. Contact_Address:
  300.  
  301. Address_Type: mailing and physical address
  302. Address: USGS Earth Resources Observation & Science (EROS) Center
  303. Address: 47914 252nd Street
  304. City: Sioux Falls
  305. State_or_Province: SD
  306. Postal_Code: 57198-0001
  307. Country: USA
  308.  
  309. Contact_Voice_Telephone: 605-594-6151
  310. Contact_Voice_Telephone: 1-800-252-4547
  311. Contact_TDD/TTY_Telephone: 605-594-6933
  312. Contact_Facsimile_Telephone: 605-594-6589
  313. Contact_Electronic_Mail_Address: custserv@usgs.gov
  314. Hours_of_Service: 0800 - 1600 CT, M - F (-6h CST/-5h CDT GMT)
  315.  
  316. Resource_Description: Downloadable Data
  317. Distribution_Liability:
  318. Although these data have been processed successfully on a computer system at the USGS, no warranty expressed or implied is made by the USGS regarding the use of the data on any other system, nor does the act of distribution constitute any such warranty. Data may have been compiled from various outside sources. Spatial information may not meet National Map Accuracy Standards. This information may be updated without notification. The USGS shall not be liable for any activity involving these data, installation, fitness of the data for a particular purpose, its use, or analyses results.
  319. Standard_Order_Process:
  320.  
  321. Digital_Form:
  322.  
  323. Digital_Transfer_Information:
  324.  
  325. Format_Name: ARCG
  326. Format_Version_Number: ArcGIS 9.3
  327. Format_Specification: Raster
  328.  
  329. Digital_Transfer_Option:
  330.  
  331. Online_Option:
  332.  
  333. Computer_Contact_Information:
  334.  
  335. Network_Address:
  336.  
  337. Network_Resource_Name: <http://nationalmap.gov>
  338. Network_Resource_Name: <http://seamless.usgs.gov>
  339.  
  340. Access_Instructions:
  341. The URL, <http://seamless.usgs.gov>, provides a map interface that allows for data downloads within a customer defined area of interest. Zoom tools are available that can be used to investigate areas of interest on the map interface. The download tool allows the customer to capture layers from the map, utilizing The National Map Seamless Server process for downloading. A request summary page is then generated with the download layers listed. By clicking the "download" button on the summary page, a zipped file will be generated that can be saved on the customer's computer. The file can then be unzipped and imported into various user software applications.
  342. Online_Computer_and_Operating_System: Not available for dissemination
  343.  
  344. Fees: None
  345. Ordering_Instructions: None. Downloadable data.
  346. Turnaround: Variable
  347.  
  348. Custom_Order_Process: None
  349. Technical_Prerequisites:
  350. At minimum, ESRI ArcGIS 9.1 Suite or equivalent GIS processing software and supporting operating systems.
  351. Available_Time_Period:
  352.  
  353. Time_Period_Information:
  354.  
  355. Single_Date/Time:
  356.  
  357. Calendar_Date: 2009
  358.  
  359. Metadata_Reference_Information:
  360.  
  361. Metadata_Date: 20090323
  362. Metadata_Contact:
  363.  
  364. Contact_Information:
  365.  
  366. Contact_Organization_Primary:
  367.  
  368. Contact_Organization: U.S. Geological Survey
  369.  
  370. Contact_Position: Customer Service Representative
  371. Contact_Address:
  372.  
  373. Address_Type: mailing and physical address
  374. Address: USGS Earth Resources Observation & Science (EROS) Center
  375. Address: 47914 252nd Street
  376. City: Sioux Falls
  377. State_or_Province: SD
  378. Postal_Code: 57198-0001
  379. Country: USA
  380.  
  381. Contact_Voice_Telephone: 605-594-6151
  382. Contact_Voice_Telephone: 1-800-252-4547
  383. Contact_TDD/TTY_Telephone: 605-594-6933
  384. Contact_Facsimile_Telephone: 605-594-6589
  385. Contact_Electronic_Mail_Address: custserv@usgs.gov
  386. Hours_of_Service: 0800 - 1600 CT, M - F (-6h CST/-5h CDT GMT)
  387. Contact_Instructions:
  388. The above is the contact information for the USGS Earth Resources Observation & Science (EROS) Center in Sioux Falls, SD. This is the digital data storage and distribution center for the USGS.
  389.  
  390. Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
  391. Metadata_Standard_Version: FGDC-STD-001-1998
  392. Metadata_Time_Convention: local time
  393. Metadata_Access_Constraints: None
  394. Metadata_Use_Constraints: None
  395. Metadata_Security_Information:
  396.  
  397. Metadata_Security_Classification_System: None
  398. Metadata_Security_Classification: Unclassified
  399. Metadata_Security_Handling_Description: None
  400.  
  401. Metadata_Extensions:
  402.  
  403. Online_Linkage: <http://www.esri.com/metadata/esriprof80.html>
  404. Profile_Name: ESRI Metadata Profile
  405.  
  406. Metadata_Extensions:
  407.  
  408. Online_Linkage: <http://ned.usgs.gov/NED/metadata.asp>
  409. Profile_Name: National Elevation Dataset (NED) Metadata
  410.  
  411. Generated by mp version 2.9.6 on Wed Apr 08 08:44:23 2009
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