sys_wetbas90

Metadata:

• Identification_Information
• Data_Quality_Information
• Spatial_Data_Organization_Information
• Spatial_Reference_Information
• Entity_and_Attribute_Information
• Distribution_Information
• Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator:

The Nature Conservancy (TNC) Eastern Region Conservation Science

Publication_Date: 2005

Title: sys_wetbas90

Geospatial_Data_Presentation_Form: vector digital data

Other_Citation_Details: Copyright © 2005 The Nature Conservancy. All rights reserved.

Online_Linkage: <http://conserveonline.org/workspaces/ecs/napaj/nap>

Description:

Abstract:

This grid of 90 meter cells represents the results of a GIS based model to identify freshwater wetland communities in Northern Appalachian/Acadian ecoregion. Attributes include items such as the size of the occurrence, elevation, bedrock geology, conservation status, landscape context, and portfolio status.

Purpose:

Much of the Northern Appalachian / Acadian region is soggy. Massive Pleistocene glaciers left behind a legacy of deranged drainage patterns forming over a million acres of marshes, mudflats, seeps, swamps, and spongy bogs. These features are unevenly distributed across all subregions (Map 1), with the easternmost Acadian uplands and the Bras D’Or lowlands having more than the rest of the subregions combined. Wetlands in this ecoregion average 43 acres, with a maximum size of over 34,000 acres. Over all they constitute 2 percent of the ecoregion.

Individual wetlands occur on all substrate types and across all elevation zones. Protecting examples from across these gradients is important for conserving biodiversity; however, wetlands are six times more common at low elevations on acidic sedimentary bedrock than the next most common combination. Special attention was given to representing all the variation in this common setting.

TNC ecoregional planning identified 568 critical occurrences. When measured by area, the critical sites account for 24 percent of all wetlands-- this is more than might be expected because the critical sites are consistently larger than average. One quarter (26%) of the critical sites are currently protected on reserves with a GAP status of 1 or 2. Another 30% occur on land that is managed as GAP 3 and have restrictions on development.

Please see NAP Ecoregional Plan 2005, Freshwater Wetland Ecosystems (Anderson, 2005) for more information.

Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 2005

Currentness_Reference: publication date

Status:

Progress: Complete

Maintenance_and_Update_Frequency: As needed

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -76.507901

East_Bounding_Coordinate: -59.081115

North_Bounding_Coordinate: 49.390513

South_Bounding_Coordinate: 42.181592

Keywords:

Theme:

Theme_Keyword: Ecological Land Units

Theme_Keyword: ELU

Theme_Keyword: landform

Theme_Keyword: geology

Theme_Keyword: elevation

Theme_Keyword: wetland

Theme_Keyword: freshwater

Theme_Keyword: model

Theme_Keyword: ecosystems

Place:

Place_Keyword: Northern Appalachian

Place_Keyword: Northeast U.S.

Place_Keyword: Northeast Canada

Place_Keyword: Quebec

Place_Keyword: New Brunswick

Place_Keyword: Nova Scotia

Place_Keyword: Prince Edward Island

Place_Keyword: Maine

Place_Keyword: New Hampshire

Place_Keyword: Vermont

Place_Keyword: New York

Place_Keyword: Massachsuetts

Use_Constraints:

The Nature Conservancy (TNC) created this data set from the manipulation, analysis, and/or synthesis of publicly available data sources. Commercial use of this data set is prohibited and redistribution of this dataset must be approved by The Nature Conservancy Eastern Conservation Science Department. This data set must be cited on all electronic and hard copy products using the language of the Data Set Credit.

Point_of_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: The Nature Conservancy, Eastern Conservation Science

Contact_Address:

Address: 11 Avenue de Lafayette, 5th Floor

City: Boston

State_or_Province: MA

Postal_Code: 02111-1736

Country: USA

Contact_Voice_Telephone: 617-542-1908 ext 249

Contact_Facsimile_Telephone: 617-542-1620

Contact_Electronic_Mail_Address: ecs-ecoplans@tnc.org

Data_Set_Credit: The Nature Conservancy (TNC) Eastern Conservation Science 2005.

Native_Data_Set_Environment:

Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.2.0.1324

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report:

No formal accuracy report has been assembled for this dataset. Data sources range widely in their resolution and accuracy. Nominal scale for elevation (used to construct elevation zones and landforms) is 1:100,000 (please see web site <http://edcnts12.cr.usgs.gov/ned>); geology data were compiled at scales ranging from 1:100,000k to 1:250,000k . Attribute and spatial accuracy will consequently vary widely in ecological land unit components. Appropriate scales for display, mapping, and analysis, and the uses to which these data should be put, are therefore limited. Producers/purveyors of the geologic datasets caution that display and use of data at scales larger than that of data compilation is unadvisable, and should be performed only in full awareness of dataset limitations. Landforms will bear sharper scrutiny, and will support use and analysis at scales as large as 1:24,000.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

No formal accuracy report has been assembled for this dataset. Data sources range widely in their resolution and accuracy. Nominal scale for elevation (used to construct elevation zones and landforms) is 1:24,000 (please see web site <http://edcnts12.cr.usgs.gov/ned>); bedrock geology data for the states in the US portion of the ecoregion were compiled at scales ranging from 1:100,000k to 1:250,000k [see ecoregion specific metadata document for more information)] Surficial geologic information was compiled at 1:1,000,000. Attribute and spatial accuracy will consequently vary widely in ecological land unit components. Appropriate scales for display, mapping, and analysis, and the uses to which these data should be put, are therefore limited. Producers/purveyors of the geologic datasets caution that display and use of data at scales larger than that of data compilation is unadvisable, and should be performed only in full awareness of dataset limitations. Landforms will bear sharper scrutiny, and will support use and analysis at scales as large as 1:24,000.

Lineage:

Source_Information:

Process_Step:

Process_Description:

Steps 1 through 4 relate to construction of wetland basin model (90m raster dataset) for Northern Appalachian Ecoregion outside of Quebec. Step1: generated preliminary 90m grid: wet flat landform from 90m ELU dataset and landcover 91/92 (emergent or forested wetland) from 30m ecoregional landcover

Process_Step:

Process_Description:

Step 2: Expanded grid from step 1 by one 90m cell, then shrank by one cell-- this has the effect of filling in interior perforations in the grid (in step 1, the ArcInfo algorithm is a bit arbitrary deciding whether a 90m landform cell with some 30m landcover 91/92 cells within it is included in the output grid or not), and of tightening the wet basin model occurrences (MOs) into shapes that better agree with other state or provincial wetland datasets.

Process_Step:

Process_Description:

Step 3: Regiongrouped output grid from step 2, and attributed each wetbasin MO with state/province, ecoregion, subregion.

Process_Step:

Process_Description:

Step 4: Wetbasin model occurrences in Quebec were not represented well due to their poor representation in the Quebec landcover data embedded in the regional landcover dataset. Deleted Quebec occurrences-- and other occurrences not within the NAP ecoregion.

Process_Step:

Process_Description:

Steps 5 & 6 relate to the construction of a wetland basin dataset for Quebec. Step 5: Gridded polygons from a vector dataset of Quebec wetlands to 90m cells.

Process_Step:

Process_Description:

Step 6: Expanded and shrunk 90m grid from step 5 by one cell; again, fills in perforations and gaps/breaks in the way gridded polys are represented.

Process_Step:

Process_Description: Step 7: Merged non-Quebec & Quebec datasets

Process_Step:

Process_Description:

Step 8: Regiongrouped grid from step 7. Attributed all occurrences with a set of variables related to MO size, condition, and context, including a range of locational and biophysical variables.

Process_Step:

Process_Description:

After review and screening of model occurrences at a series of meetings throughout ecoregion, MOs coded for inclusion in ecoregional portfolio.

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Vector

Point_and_Vector_Object_Information:

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: G-polygon

Point_and_Vector_Object_Count: 34221

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Planar:

Map_Projection:

Map_Projection_Name: Albers Conical Equal Area

Albers_Conical_Equal_Area:

Standard_Parallel: 43.000000

Standard_Parallel: 46.000000

Longitude_of_Central_Meridian: -72.000000

Latitude_of_Projection_Origin: 42.000000

False_Easting: 0.000000

False_Northing: 0.000000

Planar_Coordinate_Information:

Planar_Coordinate_Encoding_Method: coordinate pair

Coordinate_Representation:

Abscissa_Resolution: 0.000000

Ordinate_Resolution: 0.000000

Planar_Distance_Units: meters

Geodetic_Model:

Horizontal_Datum_Name: North American Datum of 1927

Ellipsoid_Name: Clarke 1866

Semi-major_Axis: 6378206.400000

Denominator_of_Flattening_Ratio: 294.978698

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: sys_wetbas90

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: AREA

Attribute:

Attribute_Label: PERIMETER

Attribute:

Attribute_Label: SYS_WETBAS

Attribute:

Attribute_Label: VALUE

Attribute_Definition: Uniq identifier for model occurrence (MO)

Attribute:

Attribute_Label: ACRES

Attribute_Definition: Size of MO in acres

Attribute:

Attribute_Label: SIZECLASS

Attribute_Definition: Sizeclasses 1 (smallest) through 4: equal area classes

Attribute:

Attribute_Label: PU_CODE

Attribute_Definition: Ecoregion

Attribute:

Attribute_Label: ELC_NAME

Attribute_Definition: Subregion

Attribute:

Attribute_Label: ST_PROV

Attribute_Definition: State or province in which centroid for MO falls

Attribute:

Attribute_Label: COUNTYNAME

Attribute_Definition: County in which centroid for MO falls

Attribute:

Attribute_Label: X_COORD

Attribute_Definition: Longitude (DD) of MO centroid

Attribute:

Attribute_Label: Y_COORD

Attribute_Definition: Latitude (DD) of MO centroid

Attribute:

Attribute_Label: LINK

Attribute_Definition:

Elev-bedrock combination for this MO: this is max_elevzone + max_bedgeo (2 fields that follow link_sizerank)

Attribute:

Attribute_Label: LINK_SIZER

Attribute_Definition:

For this particular "link" value (elev-bedrock combination), this is the size order of the MO (1 is biggest MO of this link value); a value of 0 indicates that the MO is not in NAP

Attribute:

Attribute_Label: MAX_ELEVZO

Attribute_Definition: Elevation zone that the MO primarily occupies

Attribute:

Attribute_Label: ELEVZONE_D

Attribute_Definition: Text description of the "Max_elevzone" class

Attribute:

Attribute_Label: MAX_BEDGEO

Attribute_Definition: Principal bedrock class for that MO

Attribute:

Attribute_Label: BEDGEO_DES

Attribute_Definition: Text description of the "Max_bedgeo" class

Attribute:

Attribute_Label: PCT_DECID

Attribute_Definition: Percent of this MO of the deciduous forest landcover class

Attribute:

Attribute_Label: PCT_CONIFM

Attribute_Definition:

Percent of this MO of the coniferous-mixed forest landcover class

Attribute:

Attribute_Label: PCT_SHRUB

Attribute_Definition: Percent of this MO of the shrub landcover class

Attribute:

Attribute_Label: PCT_FORWET

Attribute_Definition: Percent of this MO of the forested wetland landcover class

Attribute:

Attribute_Label: PCT_EMERG

Attribute_Definition: Percent of this MO of the emergent wetland landcover class

Attribute:

Attribute_Label: PCT_WATER

Attribute_Definition: Percent of this MO of the open water landcover class

Attribute:

Attribute_Label: PCT_OPENBA

Attribute_Definition: Percent of this MO of the open barren landcover class

Attribute:

Attribute_Label: PCT_OPENTR

Attribute_Definition: Percent of this MO of the open transitional landcover class

Attribute:

Attribute_Label: PCT_DEVEL

Attribute_Definition: Percent of this MO of the developed landcover class

Attribute:

Attribute_Label: PCT_AG

Attribute_Definition: Percent of this MO of the agriculture landcover class

Attribute:

Attribute_Label: DIST2RD_MI

Attribute_Definition: Minimum distance from MO boundary to primary or secondary road

Attribute:

Attribute_Label: DIST2RD_ME

Attribute_Definition: Mean distance (for whole MO) to primary or secondary road

Attribute:

Attribute_Label: LCI1

Attribute_Definition:

Landcover index for this MO; value of 0 indicates all natural landcover in MO & a 1200m buffer around it); higher values indicate increasing levels of conversion of 1200m buffer to non-natural landcover; LCI1 is calculated w/ transitional landcover class counted as low intensity conversion to non-natural landcover

Attribute:

Attribute_Label: LCI2

Attribute_Definition:

Landcover index for this MO; value of 0 indicates all natural landcover in MO & a 1200m buffer around it); higher values indicate increasing levels of conversion of 1200m buffer to non-natural landcover; LCI2 is calculated w/ transitional landcover class counted as natural landcover

Attribute:

Attribute_Label: NUM_EOS

Attribute_Definition: Number of Element Occurrences in this MO

Attribute:

Attribute_Label: BLOCK_ACRE

Attribute_Definition:

Size of block (defined by primary & secondary roads) this MO occupies: acres

Attribute:

Attribute_Label: BLOCK_HECT

Attribute_Definition:

Size of block (defined by primary & secondary roads) this MO occupies: hectares

Attribute:

Attribute_Label: PRTCAT0603

Attribute_Definition:

Final Portfolio Code as of 3/2006 After State Review: Critical = confirmation with element occurrence or expert information, Candiate = larger than size criteria (>= 50acres) and below LCI2 criteria (<20); Provisional Candidate = larger than size criteria (>= 50 acres) and above LCI2 of 20 but below LCI2 of 50; Supporting = Below size criteria (< 50acres) and any LCI2; Protected = 50% or greater GAP status 1 and 2 total

Attribute:

Attribute_Label: DEFINITION

Attribute_Definition:

Definition Category based on tabular information (before state review): Candiate = larger than size criteria (>= 50acres) and below LCI2 criteria (<20); Provisional Candidate = larger than size criteria (>= 50 acres) and above LCI2 of 20 but below LCI2 of 50; Supporting = Below size criteria (< 50acres) and any LCI2; Protected = 50% or greater GAP status 1 and 2 total

Attribute:

Attribute_Label: PCT_GAP12

Attribute_Definition: Pct of this MO in GAP 1 or GAP 2 protection level (if any)

Attribute:

Attribute_Label: MGDAREA_IN

Attribute_Definition: Primary managed area for this MO (if any)

Attribute:

Attribute_Label: PORT0603

Attribute_Definition: Portfolio as of 3/2006: Y = critical sites

Attribute:

Attribute_Label: PCT_GAP3OR

Distribution_Information:

Resource_Description: Downloadable Data

Distribution_Liability:

The Nature Conservancy makes no any warranty, expressed or implied, as to the use or appropriateness of use of the enclosed data, nor are there warranties of merchantability or fitness for a particular purpose or use. No representation is made as to the currency, accuracy or completeness of this information or of the data sources on which it is based. The Nature Conservancy are not liable for any lost profits, consequential damages, or claims against the user by third parties.

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Transfer_Size: 11.057

Metadata_Reference_Information:

Metadata_Date: 20070828

Metadata_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: The Nature Conservancy, Eastern Conservation Science

Contact_Address:

Address_Type: mailing and physical address

Address: 11 Avenue de Lafayette, 5th Floor

City: Boston

State_or_Province: MA

Postal_Code: 02111-1736

Country: USA

Contact_Electronic_Mail_Address: ecs-ecoplans@tnc.org

Hours_of_Service: 9am-5pm

Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001-1998

Metadata_Time_Convention: local time

Metadata_Extensions:

Online_Linkage: <http://www.esri.com/metadata/esriprof80.html>

Profile_Name: ESRI Metadata Profile