Locations of permanent survey stations used to monitor the water level of freshwater lakes on Assateague Island National Seashore

Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: ASIS Geomorphology Technician
Publication_Date: 200307
Title:
Locations of permanent survey stations used to monitor the water level of freshwater lakes on Assateague Island National Seashore
Geospatial_Data_Presentation_Form: vector digital data
Online_Linkage: http://science.nature.nps.gov/nrdata
Description:
Abstract:
In the summer of 2003, NRM Personnel and cooperators installed and surveyed-in survey markers (steel pipe, survey nails), and water level Staff Gauges at freshwater pond sites in the study area of ASIS Maryland using a total station and traditional surveying methods. These data are the positions of permanent monitoring stations (Staff Gauges), from which pond water level will be tracked, and of permanent survey markers, or 'benchmarks', from which future measurements and calibrations can be staged.
Purpose:
The purpose of this data set is to obtain real-world coordinates and elevations for these installations that they may be referred to Sea Level - an important aspect of the questions surrounding ASIS pond dynamics - and re-calibrated, measured, and recovered using related methodologies.
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 20030724
Currentness_Reference:
publication date
Status:
Progress: Complete
Maintenance_and_Update_Frequency: Annually
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -75.243093
East_Bounding_Coordinate: -75.091955
North_Bounding_Coordinate: 38.323138
South_Bounding_Coordinate: 38.027429
Keywords:
Theme:
Theme_Keyword_Thesaurus: Assateague Island National Seashore Keyword Thesaurus
Theme_Keyword: ponds
Theme_Keyword: freshwater
Theme_Keyword: monitoring
Theme_Keyword: survey points
Theme:
Theme_Keyword_Thesaurus: National Park Service Theme Category Thesaurus
Theme_Keyword: Water
Theme_Keyword: Monitoring
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: inlandWaters
Place:
Place_Keyword_Thesaurus: Geographic Names Information System
Place_Keyword: North America
Place_Keyword: Maryland
Place_Keyword: Worcester County
Place_Keyword: Assateague Island National Seashore
Place:
Place_Keyword_Thesaurus: National Park System Unit Name Thesaurus
Place_Keyword: Assateague Island National Seashore
Place:
Place_Keyword_Thesaurus: National Park System Unit Code Thesaurus
Place_Keyword: ASIS
Access_Constraints: None
Use_Constraints:
None
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Assateague Island National Seashore
Contact_Position: GIS Specialist
Contact_Address:
Address_Type: mailing and physical address
Address:
7206 National Seashore Lane
City: Berlin
State_or_Province: MD
Postal_Code: 21811
Country: USA
Contact_Voice_Telephone: 410-641-1443
Contact_Facsimile_Telephone: 410-641-1099
Contact_Electronic_Mail_Address: asis_gis@nps.gov
Hours_of_Service: 8am-4:30pm
Security_Information:
Security_Classification: Unclassified
Native_Data_Set_Environment:
Microsoft Windows 2000 Version 5.0 (Build 2195) Service Pack 4; ESRI ArcCatalog 8.2.0.700
Cross_Reference:
Citation_Information:
Originator: Assateague Island National Seashore
Publication_Date: 200307
Title:
Metadata for Locations of permanent survey stations used to monitor the water level of freshwater lakes on Assateague Island National Seashore
Geospatial_Data_Presentation_Form: vector digital data
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Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
All attempts are made to perform mapping at the time when water level conditions are nearest to "normal".  Monitoring of weather over the period leading up to collection, monitoring of regional real-time tide levels as observed against predictions (and subsequent extrapolation to OC), and visual observations are all used to predict a best day.

On days of data collection, a GPS position is taken of a known point - a permanent monument - and the collected position is compared to the known coordinates to insure accuracy.  All collected files are normally differentially corrected using the base station files from NJDEP, Trenton, NJ.  NJDEP files were not used in this instance because the known point was collected after 20:00 EDT - the stopping point of NJDEP file collection.  Base station correction files were instead obtained from VIMS (per recommendation of the NPS CRGIS base station site, which was unavailable for the time period).  The accuracy of the Northing and Easting coordinates was sub-meter for this survey.

A note on file editing: in summer 2002, the GIS/Geomorphology section of ASIS-NRM instituted new shoreline processing procedures.  This file was processed using these general guidelines to editing: Check for errors by scrolling one frame at a time through the entire map at a 1:2,000 Scale.  Gaps of 5 meters or less can be joined as long as you are certain they were unintentional/errors, and not true features (like a temporary stream/inlet).  Use great care in joining and if you are adding vertices; try to mimic natural line-flow as best as possible.  Obviously unintentional clustering (E.g., explained by points taken while standing still) of non-line points should be cleared up by deleting carefully chosen points.

Post-collection editing of note for this shoreline: originally comprised of two features, these were joined together as the seperation was due only to a battery change.
Logical_Consistency_Report:
Topology was created for this data set.
Completeness_Report:
This data set contains the locations of permanent survey equipment for monitoring the level of fresh water ponds on Assateague Island National Seashore
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
unknown
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report:
unknown
Lineage:
Process_Step:
Process_Description:
The Nikon Top Gun total station (model DTM-A10LG, ca. 1994)  is set up above monuments, and it is then oriented by backsighting to another known point (monument or witness post).  Data points (coordinates and elevation) are then collected from a fixed height and orientation above the monument. When line-of-sight to point of interest is not available, a station reset is performed at intervening temporary set-up points (maintaining line-of-sight for backsight and new point collection).

Pond Survey Markers (posts and survey nails) were installed according to convenience for calibration and measuring, and then positions of tops of markers were collected.  Staff Gauges were installed according to ease of view from shores, and appropriate depth for long-term monitoring; position data are points directly adjacent (~3.5-6.5cm) to the gauges.

Ponds were located with GPS, naming convention and metadata were done at a later date.
Process_Date: 20030702
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Assateague Island National Seashore
Contact_Position: GIS Specialist
Contact_Address:
Address_Type: mailing and physical address
Address:
7206 National Seashore Lane
City: Berlin
State_or_Province: Maryland
Postal_Code: 21811
Country: United States
Contact_Voice_Telephone: 410-641-1443
Contact_Facsimile_Telephone: 410-641-1099
Contact_Electronic_Mail_Address: asis_gis@nps.gov
Hours_of_Service: 8:00am-4:30pm
Process_Step:
Process_Description:
Dataset copied.
Source_Used_Citation_Abbreviation:
S:\Scratch\nick_temp\Metadata_Edits\ponds\ASIS_pond installed points
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Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Vector
Point_and_Vector_Object_Information:
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: Entity point
Point_and_Vector_Object_Count: 40
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Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Grid_Coordinate_System:
Grid_Coordinate_System_Name: Universal Transverse Mercator
Universal_Transverse_Mercator:
UTM_Zone_Number: 18
Transverse_Mercator:
Scale_Factor_at_Central_Meridian: 0.999600
Longitude_of_Central_Meridian: -75.000000
Latitude_of_Projection_Origin: 0.000000
False_Easting: 500000.000000
False_Northing: 0.000000
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:
Abscissa_Resolution: 0.000064
Ordinate_Resolution: 0.000064
Planar_Distance_Units: meters
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: 298.257222
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Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: pond installed points
Entity_Type_Definition:
Location of survey stations on Assateague Island National Seashore
Entity_Type_Definition_Source:
ASIS
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: LABEL
Attribute:
Attribute_Label: FEAT_NAME
Attribute:
Attribute_Label: GPS_HEIGHT
Attribute_Definition_Source:
ASIS
Attribute:
Attribute_Label: NORTHING
Attribute_Definition:
Coordinates used to determine exact feature location
Attribute_Definition_Source:
ASIS
Attribute_Domain_Values:
Unrepresentable_Domain:
UTM coordinate
Attribute:
Attribute_Label: EASTING
Attribute_Definition:
Coordinates used to determine exact feature location
Attribute_Definition_Source:
ASIS
Attribute_Domain_Values:
Unrepresentable_Domain:
UTM coordinate
Attribute:
Attribute_Label: POINT_ID
Attribute:
Attribute_Label: INSTALLATI
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Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Assateague Island National Seashore
Contact_Position: GIS Specialist
Contact_Address:
Address_Type: mailing and physical address
Address:
7206 National Seashore Lane
City: Berlin
State_or_Province: Maryland
Postal_Code: 21811
Country: United States
Contact_Voice_Telephone: 410-641-1443
Contact_Facsimile_Telephone: 410-641-1099
Contact_Electronic_Mail_Address: asis_gis@nps.gov
Hours_of_Service: 8:00am-4:30pm
Resource_Description: Downloadable Data
Distribution_Liability:
The National Park Service shall not be held liable for improper or incorrect use of the data described and/or contained herein. These data and related graphics (i.e. "GIF or JPG" format files) are not legal documents and are not intended to be used as such. The information contained in these data is dynamic and may change over time. The data are not better than the original sources from which they were derived. It is the responsibility of the data user to use the data appropriately and consistent within the limitations of geospatial data in general and these data in particular. The related graphics are intended to aid the data user in acquiring relevant data; it is not appropriate to use the related graphics as data. The National Park Service gives no warranty, expressed or implied, as to the accuracy, reliability, or completeness of these data. It is strongly recommended that these data are directly acquired from an NPS server and not indirectly through other sources which may have changed the data in some way. Although these data have been processed successfully on computer systems at the National Park Service , no warranty expressed or implied is made regarding the utility of the data on other systems for general or scientific purposes, nor shall the act of distribution constitute any such warranty. This disclaimer applies both to individual use of the data and aggregate use with other data.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: SHP
Transfer_Size: 0.017
Fees: None
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Metadata_Reference_Information:
Metadata_Date: 20061113
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Assateague Island National Seashore
Contact_Position: GIS Specialist
Contact_Address:
Address_Type: mailing and physical address.
Address:
7206 National Seashore Lane
City: Berlin
State_or_Province: MD
Postal_Code: 21811
Country: USA
Contact_Voice_Telephone: 410-641-1443
Contact_Facsimile_Telephone: 410-641-1099
Contact_Electronic_Mail_Address: asis_gis@nps.gov
Hours_of_Service: 8am-4:30pm EST
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: local time
Metadata_Access_Constraints: none
Metadata_Use_Constraints:
none
Metadata_Extensions:
Online_Linkage: http://www.esri.com/metadata/esriprof80.html
Profile_Name: ESRI Metadata Profile
Metadata_Extensions:
Online_Linkage: http://nrdata.nps.gov/profiles/nps_profile.xml
Profile_Name: NPS Metadata Profile
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