GRANIT Home GRANIT Header





GIS Event Calendar
August
1234
567891011
12131415161718
1920
21
22232425
262728293031



Two Foot Contours - East Meadow River-Merrimack River (010700061404) - smooth

Two Foot Contours - East Meadow River-Merrimack River (010700061404) - smooth

Metadata also available as - [Parseable text] - [SGML] - [XML]

Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: Earth Systems Research Center, University of New Hampshire
Publication_Date: 20130531
Title:
Two Foot Contours - East Meadow River-Merrimack River (010700061404) - smooth
Geospatial_Data_Presentation_Form: vector digital data
Publication_Information:
Publication_Place: Durham, New Hampshire
Publisher: Earth Systems Research Center, University of New Hampshire
Other_Citation_Details: None
Online_Linkage:
<URL://<http://www.granit.unh.edu/cgi-bin/nhsearch?dset=contours_2ft_smooth/contours_2ft_smooth_010700061404>
Description:
Abstract:
This data set represents smoothed, 2-foot bare earth contours (isolines) for the East Meadow River-Merrimack River unit. The data set was extracted from a regional elevation contour data set derived from the Coastal New Hampshire LiDAR collection (2011). Prior to contour generation, the regional LiDAR raster was "smoothed" using the ArcGIS "Focal Statistics" tool using a 3x3 circular neighborhood. The contours were generated using the ArcGIS "Contour" tool while applying a Z factor of 3.2802 to convert the elevation values from meters to feet. Once generated, contours less than 1 meter in length were deleted. The contours were further generalized using the "Smooth" function from within ArcMap with a maximum allowable offset of 0.1 meter.
Purpose:
These 2-foot contours were developed for visual use and comparison with other GIS data sets. The suitability for technical, scientific, or other finished cartographic purposes is unknown and should not be assumed.
Supplemental_Information:
A companion data set representing smoothed versions of the raw contours is also available for GRANIT, recommended for cartographic use only.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20110506
Ending_Date: 20110530
Currentness_Reference: None
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -71.0
East_Bounding_Coordinate: -71.080475
North_Bounding_Coordinate: 42.858008
South_Bounding_Coordinate: 42.793274
Keywords:
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: Elevation
Theme_Keyword: contours
Theme_Keyword: hypsography
Theme_Keyword: LiDAR
Theme_Keyword: coastal
Theme_Keyword: coastalcontours
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Categories
Theme_Keyword: elevation
Place:
Place_Keyword_Thesaurus: None
Place_Keyword: United States
Place_Keyword: Northeast
Place_Keyword: New England
Place_Keyword: New Hampshire
Place_Keyword: East Meadow River-Merrimack River
Access_Constraints: None
Use_Constraints: Please cite NH GRANIT.
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Earth Systems Research Center
Contact_Person: GRANIT Database Manager
Contact_Position: Database Manager
Contact_Address:
Address_Type: mailing and physical address
Address: Morse Hall, University of New Hampshire
City: Durham
State_or_Province: NH
Postal_Code: 03824
Country: US
Contact_Voice_Telephone: 603-862-1792
Contact_Facsimile_Telephone: 603-862-0188
Contact_Electronic_Mail_Address: granit@unh.edu
Hours_of_Service: 8:30AM-5PM, EST
Browse_Graphic:
Browse_Graphic_File_Name:
<URL://http://www.granit.unh.edu/cgi-bin/load_file?PATH=/data/database/d-webdata/contours_2ft_smooth/browse.gif>
Browse_Graphic_File_Description: gif image file
Browse_Graphic_File_Type: gif
Data_Set_Credit: NH GRANIT
Native_Data_Set_Environment:
Microsoft Windows 7 Version 6.1 (Build 7601) Service Pack 1; Esri ArcGIS 10.1.1.3143

Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
The critical attribute of this data is the contour elevation, the absolute accuracy of which has been affected by a number of processing steps. The original LiDAR elevation deliverables had a 2 meter or better nominal post spacing (2m GSD) and a a bare earth vertical accuracy of 15.0 centimeters RMSEz or better. Prior to contouring, the input raster was "smoothed" using a 3x3 circular neighborhood. The original elevation units of meters were converted to feet using a factor of 3.2808.
Quantitative_Attribute_Accuracy_Assessment:
Attribute_Accuracy_Value: Floating point
Attribute_Accuracy_Explanation: None
Logical_Consistency_Report:
Efforts were made to ensure that individual contour lines do not cross one another. The polyline topology rules "Must Not Ovelap", "Must Not Intersect", "Must Not Self-Overlap", and "Must Not Self-Intersect" were enforced to achieve this.
Completeness_Report:
Contour line segments less than 1 meter in length have been deleted.
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator: Complex Systems Research Center, University of New Hampshire
Publication_Date: 200601
Title: New Hampshire Hydrography Dataset
Type_of_Source_Media: None
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 1956
Ending_Date: 2005
Source_Currentness_Reference: Ground_Condition
Source_Citation_Abbreviation: Bound_HUC
Source_Contribution: NHD HUC watershed delineations.
Source_Information:
Source_Citation:
Citation_Information:
Originator: Photo Science, Inc.
Publication_Date: 2011
Title: Coastal New Hampshire 2011 LiDAR collection
Type_of_Source_Media: None
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20110506
Ending_Date: 20110630
Source_Currentness_Reference: Ground_Condition
Source_Citation_Abbreviation: Coastal_LiDAR_DEM
Source_Contribution: Two-meter LiDAR DEM
Process_Step:
Process_Description:
Ran the ArcGIS "Focal Statistics", circular 3x3 neighborhood, mean statistic.
Source_Used_Citation_Abbreviation: Coastal_LiDAR_DEM
Process_Date: 20130416
Source_Produced_Citation_Abbreviation: temp_LiDAR_DEM
Process_Step:
Process_Description:
Ran the ArcGIS "Contour" tool using temp_LiDAR_DEM as the input raster and a Z factor of 3.2808 to produce 2-foot contours. A post processing step to remove short contours (length < 1 meter) was also performed.
Source_Used_Citation_Abbreviation: temp_LiDAR_DEM
Process_Date: 20130503
Source_Produced_Citation_Abbreviation: temp_Contours
Process_Step:
Process_Description:
Final processing included 1) selecting all contours (from within ArcMap) and running the Advanced Editing "Smooth" tool with a Maximum Allowable Offset of 0.1 meter, 2) applying the "Densify" tool using a max_deviation (offset) of 0.025 meters (this step was necessary to remove the Bezier arcs introduced by the "Smooth" routine - otherwise, it was not possible to clip the contours), 3) clipping the regional contour data set by HUC10, 4) applying the "Must Not Ovelap", "Must Not Intersect", "Must Not Self-Overlap", and "Must Not Self-Intersect" topolgy rules and fixing any errors, 5) projecting each HUC10 data set from UTM to NH State Plane feet, NAD83, and 6) clipping the HUC10 data sets by HUC12. (The original plan was to distribute the data by HUC10, but the large file sizes (in excess of 500 GB) were considered too large for web distribution. Once this finding was discovered, it was more expedient to re-clip from the HUC10 data sets.)
Source_Used_Citation_Abbreviation: temp_Contours, Bound_HUC
Process_Date: 20130503

Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Vector
Point_and_Vector_Object_Information:
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: String
Point_and_Vector_Object_Count: 3894

Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Map_Projection:
Map_Projection_Name: NAD 1983 StatePlane New Hampshire FIPS 2800 Feet
Transverse_Mercator:
Scale_Factor_at_Central_Meridian: 0.9999666666666667
Longitude_of_Central_Meridian: -71.66666666666667
Latitude_of_Projection_Origin: 42.5
False_Easting: 984250.0
False_Northing: 0.0
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:
Abscissa_Resolution: 0.0003280833333333333
Ordinate_Resolution: 0.0003280833333333333
Planar_Distance_Units: foot_us
Geodetic_Model:
Horizontal_Datum_Name: D North American 1983
Ellipsoid_Name: GRS 1980
Semi-major_Axis: 6378137.0
Denominator_of_Flattening_Ratio: 298.257222101

Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: Contours_2ft_010700061404_smooth
Entity_Type_Definition: 2-foot elevation contours
Entity_Type_Definition_Source: GRANIT
Attribute:
Attribute_Label: Shape_Length
Attribute_Definition: Length of feature in internal units.
Attribute_Definition_Source: Esri
Attribute_Domain_Values:
Unrepresentable_Domain: Positive real numbers that are automatically generated.
Attribute:
Attribute_Label: Id
Attribute_Definition: Software populated id.
Attribute_Definition_Source: Esri
Attribute_Domain_Values:
Unrepresentable_Domain:
Sequential unique whole numbers that are automatically generated by the software.
Attribute:
Attribute_Label: Contour
Attribute_Definition: elevation contour interval in feet.
Attribute_Definition_Source: GRANIT
Attribute_Domain_Values:
Unrepresentable_Domain:
Elevation contour intervals automatically generated by the software.
Attribute:
Attribute_Label: Shape
Attribute_Definition: Feature geometry.
Attribute_Definition_Source: Esri
Attribute_Domain_Values:
Unrepresentable_Domain: Coordinates defining the features.
Attribute:
Attribute_Label: OBJECTID
Attribute_Definition: Internal feature number.
Attribute_Definition_Source: Esri
Attribute_Domain_Values:
Unrepresentable_Domain:
Sequential unique whole numbers that are automatically generated.

Metadata_Reference_Information:
Metadata_Date: 20130520
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Earth Systems Research Center
Contact_Person: GRANIT Database Manager
Contact_Position: GRANIT Database Manager
Contact_Address:
Address_Type: physical
Address: 8 College Rd
City: Durham
State_or_Province: New Hampshire
Postal_Code: 03824
Country: US
Contact_Voice_Telephone: 603-862-1792
Contact_Facsimile_Telephone: 603-862-0188
Contact_Electronic_Mail_Address: granit@unh.edu
Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: local time

Generated by mp version 2.8.13 on Fri Jul 19 13:14:39 2013
CSRC EOS UNH Send Email to GRANIT Directions to Morse Hall Contact Bar