New Hampshire Buffer Gap Analysis - Grafton County

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Metadata:


Identification_Information:

Citation:
Citation_Information:
Originator: New Hampshire Department of Environmental Services
Publication_Date: 20090722
Title: New Hampshire Buffer Gap Analysis - Grafton County
Edition: One
Geospatial_Data_Presentation_Form: vector digital data
Publication_Information:
Publication_Place: Concord, New Hampshire
Publisher: New Hampshire Department of Environmental Services
Other_Citation_Details:
For Tiers 1 to 3, final output dataset depends upon the currentness of the source data layers including Conservation Lands (conslands.shp) and the National Hydrography Network and "local protections" tabular data in MS Access and related geodata developed and maintained by DES. Contact DES for more details. Note: At the end of October 2009, two major updates were applied to the dataset. The first was an adjustment to the Tier classification based on updates on local municipal regulations that were provided by the Piscataqua Region Estuaries Partnership. The second update was based on the overlay of an updated Conservation Lands dataset in which situation stream segments with conservation lands were classified as Tier 1.
Online_Linkage:
<URL:http://www.granit.unh.edu/cgi-bin/nhsearch?dset=des_buffergapanalysis/buffergapanalysis09>
Description:
Abstract:
Some river and lake riparian buffers are currently protected under existing local ordinances or by conservation lands and easements. The state Comprehensive Shoreline Protection Act protects public waters including “great ponds” (waterbodies greater than 10 acres) and rivers with a stream-order of four or greater. This analysis identifies and measures where protections occur and where they are absent along river and lake shoreline frontage. The analysis categorizes all of the state’s rivers or lakes into six levels of protection as defined in the Entity_and_Attribute_Information section below, where tier 1 is the highest level of protection.
Purpose:
To identify gaps in riparian buffer protection and to measure and report the river and lake shoreline frontage protected by conservation land, local zoning ordinances, or the Comprehensive Shoreline Protection Act (CSPA), in effect as of July 1st, 2008 under New Hampshire Statutes, Title L., Chapter 483-B
Supplemental_Information: Data distribution tile: county
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 2009
Currentness_Reference: Publication Date
Status:
Progress: Complete
Maintenance_and_Update_Frequency: As needed
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -72.343769
East_Bounding_Coordinate: -71.348643
North_Bounding_Coordinate: 44.404665
South_Bounding_Coordinate: 43.528330
Keywords:
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: Hydrography
Theme_Keyword: Flowing Water
Theme_Keyword: Watershed Planning
Theme_Keyword: Stream Order
Theme_Keyword: Shoreline Protection
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: planningCadastre
Place:
Place_Keyword_Thesaurus: None
Place_Keyword: United States
Place_Keyword: Northeast
Place_Keyword: New England
Place_Keyword: New Hampshire
Place_Keyword: Grafton County
Access_Constraints: None
Use_Constraints: Not for legal use.
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Pierce Rigrod
Contact_Organization: New Hampshire Department of Environmental Services
Contact_Position: Drinking Water and Groundwater Bureau
Contact_Address:
Address_Type: mailing and physical address
Address: 29 Hazen Drive, PO Box 95
City: Concord
State_or_Province: NH
Postal_Code: 03302
Country: US
Contact_Voice_Telephone: 603-271-0688
Contact_Facsimile_Telephone: 603-271-3305
Contact_Electronic_Mail_Address: pierce.laskey-rigrod@des.nh.gov
Native_Data_Set_Environment:
Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcGIS 10.0.3.3600


Data_Quality_Information:
Logical_Consistency_Report: n/a
Completeness_Report: The data are complete as of the publication date.
Lineage:
Process_Step:
Process_Description:
The process to classify the stream segments is built on ESRI’s Model Builder – to perform the multiple steps required to conduct the analysis – and a geodatabase to retain “scratch” or “temp” files that are generated during the analysis. The final output from the Model Builder is stored in a second geodatabase that is used to distribute model results. All analysis based on vector datasets.

The classification system is hierarchical with Tier 1 at the top of the list and Tier 6 at the bottom. The assignment of Tier protection values (1-6) has been done so that river or lake segments are assigned the highest protection (Tier) value if they meet that Tier’s criteria. Accordingly, river or lake frontage meeting Tier 1 criteria and also meeting Tier 2 or other criteria has been assigned a final Tier value = 1 (its highest level of protection). This order of precedence (1 over 2, 2 over 3, etc) results in no overlap between Tier protection classes (no double counting) in order to better estimate protected frontage as a percentage of all frontage in the watershed.

Tier 1 and 2: The two primary datasets for Tier 1 and Tier 2 analysis is the Conservation polygon shapefile (provided by NH GRANIT) and the National Hydrography Dataset provided by UNH, edited by DES. The method for generating the conservation lands dataset was a combination of converting vector data to raster and employing Spatial Analyst to identify segments whose buffers would intersect conservation lands. Conservation land parcels with no Primary Protection Type (PPTYPE field is NULL) were excluded from this analysis (see Known Issues below) and the stream segments for these parcels would be subject to Tier 3 or higher analysis.

NOTE 1: Most common error within Tier 1 and 2 coding was misclassifications of short stream segments to Tier 6 within conservation lands or coding of short segments outside conservation lands boundaries as Tier 1. To correct all Tier 6 records were isolated and an overlay analysis was used to identify which stream segments intersected the conservation land polygon (excluding parcels with no PPTYPE listed). The selected stream segments within conservation land parcels coded as Tier = 6 (no protection) were corrected from Tier 6 to Tier 1. Those short segments extending beyond the conservation land boundaries remain in the data as errors and may be manually corrected or further geoprocessed to correct.

Tier 3 (CSPA): Tier 3 includes rivers with a stream order of 4 or greater, or great ponds not assigned a Tier 1 or 2 (i.e. not protected by conservation land). A simple query was used to identify NULL classifications (after the Tier 1 and Tier 2 classification) and to identify stream orders of 4 or greater.

NOTE 2: In the original creation of the dataset the generation of double lines (that is, 2 lines for one stream segment representing each river bank of the segment) from the hydrography dataset did not generate the proper stream order for particular segments associated with double lined hydrography. However, spot checks were conducted on the major rivers to correct for this. Later iterations and methods for generating this dataset will be corrected to ensure that this will no longer be an issue.

Tier 4 and Tier 5 (Local Regulations): Tier 4 and Tier 5 is based on the presence of local zoning regulation for stream segments that do not fall into the Tier’s 1 – 3 criteria. The base data layer that identifies these communities with buffer protections in zoning ordinance was conducted in previous analysis and its results incorporated into this analysis. Stream segments were assigned to the Tier’s 4 or 5 if local zoning protected buffers according to the Tier 4 or 5 criteria and the stream/pond frontage was not assigned a higher Tier value (e.g. 1 – 3).

Tier 6 (No Protection): A Tier 6 classification indicates no protection for a stream segment. It is assigned to the all remaining river or pond frontage without protection identified and coded in the previous steps.

Process_Date: 2009


Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:
Planar:
Grid_Coordinate_System:
Grid_Coordinate_System_Name: State Plane Coordinate System 1983
State_Plane_Coordinate_System:
SPCS_Zone_Identifier: New Hampshire
Transverse_Mercator:
Scale_Factor_at_Central_Meridian: 0.999967
Longitude_of_Central_Meridian: -71.666667
Latitude_of_Projection_Origin: 42.500000
False_Easting: 984250.000000
False_Northing: 0.000000
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: Coordinate pair
Coordinate_Representation:
Abscissa_Resolution: 0.000208
Ordinate_Resolution: 0.000208
Planar_Distance_Units: Survey Feet
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1983
Ellipsoid_Name: GRS 80
Semi-major_Axis: 6378137.000000
Denominator_of_Flattening_Ratio: 298.257222


Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: grafton_buffer_gap
Entity_Type_Definition: Stream segments based on National Hydrography Dataset
Entity_Type_Definition_Source: NHDES

Attribute:
Attribute_Label: FID
Attribute_Definition: Internal feature number.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Unrepresentable_Domain:
Sequential unique whole numbers that are automatically generated.
Attribute:
Attribute_Label: SHAPE
Attribute_Definition: Feature geometry.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Unrepresentable_Domain: Coordinates defining the features.
Attribute:
Attribute_Label: StreamOrde
Attribute_Definition:
Strahler stream order to define stream size based on hierarchy of tributaries.
Attribute_Definition_Source: NHDES
Attribute_Domain_Values:
Unrepresentable_Domain: Stream order
Attribute:
Attribute_Label: Tier
Attribute_Definition: Tier classification of the stream segment
Attribute_Definition_Source: NHDES
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 1
Enumerated_Domain_Value_Definition:
Conservation Land in excess of 300 feet from river/lake frontage
Enumerated_Domain_Value_Definition_Source: NHDES
Enumerated_Domain:
Enumerated_Domain_Value: 2
Enumerated_Domain_Value_Definition:
Conservation Land greater than or equal to 100 feet but less than 300 feet from river/lake frontage
Enumerated_Domain_Value_Definition_Source: NHDES
Enumerated_Domain:
Enumerated_Domain_Value: 3
Enumerated_Domain_Value_Definition: CSPA Protection (150 ft Natural Woodland Buffer)
Enumerated_Domain_Value_Definition_Source: NHDES
Enumerated_Domain:
Enumerated_Domain_Value: 4
Enumerated_Domain_Value_Definition:
Local Protection Ordinance, buffer greater than or equal to 100 feet
Enumerated_Domain_Value_Definition_Source: NHDES
Enumerated_Domain:
Enumerated_Domain_Value: 5
Enumerated_Domain_Value_Definition:
Local Protection Ordinance, buffer greater then or equal to 50 feet, but less than 100 feet
Enumerated_Domain_Value_Definition_Source: NHDES
Enumerated_Domain:
Enumerated_Domain_Value: 6
Enumerated_Domain_Value_Definition: No Protection (meeting the criteria in the above 5 Tiers)
Enumerated_Domain_Value_Definition_Source: NHDES
Attribute:
Attribute_Label: Shape_Leng
Attribute_Definition: Length of stream segment
Attribute_Definition_Source: NHDES
Attribute_Domain_Values:
Unrepresentable_Domain: Length of stream segment in feet


Metadata_Reference_Information:
Metadata_Date: 20120315
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: NH Department of Environmental Services
Contact_Person: Pierce Rigrod
Contact_Address:
Address_Type: Mailing and physical address
Address: 29 Hazen Drive, PO Box 95
City: Concord
State_or_Province: NH
Postal_Code: 03302
Contact_Voice_Telephone: 603-271-0688
Contact_Voice_Telephone: 603-271-0688
Contact_Facsimile_Telephone: 603-271-3305
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: local time

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