Unconsolidated Aquifers at 1:250,000 - Main-Upstate NY (NYSDEC)

Metadata also available as

Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator:
New York State Department of Environmental Conservation, Division of Water, Bureau of Water Resources Management
Publication_Date: 20080229
Title: Unconsolidated Aquifers at 1:250,000 - Main-Upstate NY (NYSDEC)
Geospatial_Data_Presentation_Form: vector digital data
Publication_Information:
Publication_Place: Albany, NY
Publisher: New York State Department of Environmental Conservation
Other_Citation_Details: See Supplemental Information.
Description:
Abstract:
These aquifers were digitized using a set of five 1:250,000 scale maps of unconsolidated New York State aquifers, excluding Long Island, originally created by the USGS in partnership with the NYSDEC in the mid 1980s.
Purpose:
An increase in demand for New York State's groundwater resources has led to an increased need to develop groundwater protection and management policies. The aquifers represented in this theme resulted from an effort to facilitate the identification of the location and extent of significant unconsolidated aquifers; those that consist of sand and gravel and yield large supplies of water to wells. Bedrock aquifers, although significant in some areas, are not addressed here.
The scale of the original aquifer maps is 1:250,000. That is also the scale of the published New York State Geological Survey surficial and bedrock geology maps on which they were based. Together these maps form a consistent set of geologic and groundwater maps for use in regional management of the groundwater resources of the State.
These maps indicate only the general location of the unconsolidated aquifers; they are not intended for detailed site evaluations. Determination of the precise location of aquifer boundaries or of well yields may require additional data, according to authors of the source maps.
Supplemental_Information:
This (Main) is a component of the overall Unconsolidated Aquifer dataset (Main, Confined and Citation Block).
Four types of aquifers with known water yield conditions were mapped. These include: 1a. UNCONFINED AQUIFER, 10 TO 100 GALLONS PER MINUTE - Sand and gravel with saturated zone generally less than 10 ft thick. Thicker deposits with less permeable silty sand and gravel may also be included. Yields in areas adjacent to streams may exceed 100 gal/min through pumping-induced infiltration, but these areas are too small to show at 1:250,000 scale. 1b. UNCONFINED AQUIFER, MORE THAN 100 GALLONS PER MINUTE - Sand and gravel of high transmisivity with saturated thickness greater than 10 ft. Many such areas are associated with a surface water source that can provide pumping-induced recharge. 2a. CONFINED, with overlying surficial aquifer. The underlying aquifer of sand and gravel is separated from the overlying aquifer by a layer of relatively impermeable till, very fine sand, silt or clay. They may produce from 5 to more than 500 gallons per minute. Confined aquifers are stored in a separate layer (Unconsolidated Confined) for ease of use. 2b. CONFINED, without overlying surficial aquifer. The underlying aquifer of sand and gravel is separated from the land surface by a layer of relatively impermeable till, very fine sand, silt or clay. It may produce from 5 to more than 500 gallons per minute. 3. AQUIFERS OF UNKNOWN POTENTIAL were also mapped. These include areas of sand, or sand and gravel for which little to no well data are on file to determine yield potential. Letter symbols, explained in the attribute table, indicate the type of deposit. 4. PRIMARY WATER-SUPPLY AQUIFER REGIONS were mapped. These regions include aquifers that are highly productive and are being used as sources of drinking water by major public supply systems. The aquifers in these areas were mapped at the 1:24,000 scale by the USGS and included in separate map reports. Further, these fine scale studies were represented as citation blocks on the 1:250000 scale unconsolidated aquifer maps. These blocks are a part of this digitized layer. These regions replace the previous "Primary Aquifers" layer, as this digitization is of higher quality. The individual 1:24,000 report layers are in the process of being published as digital files by USGS.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 19640101
Ending_Date: 19860101
Currentness_Reference: ground condition
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -79.991512
East_Bounding_Coordinate: -73.204270
North_Bounding_Coordinate: 44.979596
South_Bounding_Coordinate: 40.801642
Keywords:
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: inlandWaters
Theme_Keyword: 012
Theme_Keyword: geoscientificInformation
Theme_Keyword: 008
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: Custodial
Theme_Keyword: groundwater
Theme_Keyword: unconsolidated aquifer
Theme_Keyword: unconfined aquifer
Theme_Keyword: confined aquifer
Theme_Keyword: primary aquifer
Place:
Place_Keyword_Thesaurus:
Geographic Names Information System <http://geonames.usgs.gov/pls/gnispublic>
Place_Keyword: New York State
Access_Constraints: None
Use_Constraints:
1. The NYS DEC asks to be credited in derived products. 2. Secondary Distribution of the data is not allowed. 3. Any documentation provided is an integral part of the data set. Failure to use the documentation in conjunction with the digital data constitutes misuse of the data. 4. Although every effort has been made to ensure the accuracy of information, errors may be reflected in the data supplied. The user must be aware of data conditions and bear responsibility for the appropriate use of the information with respect to possible errors, original map scale, collection methodology, currency of data, and other conditions.
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: New York State Department of Environmental Conservation
Contact_Person: Division of Water; Bureau of Water Resource Management
Contact_Position: Water Resource Management Section Chief
Contact_Address:
Address_Type: mailing and physical address
Address: 625 Broadway
City: Albany
State_or_Province: NY
Postal_Code: 12233-3508
Country: USA
Address: 4th Floor
Contact_Voice_Telephone: 518-402-8298
Contact_Electronic_Mail_Address: watergis@gw.dec.state.ny.us
Hours_of_Service: 9am-4pm
Contact_Instructions:
Please address questions about this dataset to the NYSDEC staff person listed above.
Security_Information:
Security_Classification_System: None
Security_Classification: Unclassified
Security_Handling_Description: None
Cross_Reference:
Citation_Information:
Originator: New York State Department of Environmental Conservation
Publication_Date: 19901023
Title: Primary and Principal Aquifer Determinations
Online_Linkage: <http://www.dec.ny.gov/docs/water_pdf/togs213.pdf>
Publication_Information:
Publication_Place: Albany, NY
Publisher: New York State Department of Environmental Conservation
Cross_Reference:
Citation_Information:
Originator:
New York State, Department of Health, Division of Environmental Health, Bureau of Public Water Supply
Publication_Date: 19810101
Title: Report on Ground Water Dependence in New York State
Geospatial_Data_Presentation_Form: document
Publication_Information:
Publication_Place: Albany, NY
Publisher: New York State Department of Health
Other_Citation_Details:
This report is not available in digital format. NYSDEC library has a copy on file.
Cross_Reference:
Citation_Information:
Originator:
New York State Department of Environmental Conservation, Division of Water, Bureau of Water Resources Management
Publication_Date: 20080101
Title: Unconsolidated Aquifers at 1:250,000 - Upstate NY (NYSDEC)
Geospatial_Data_Presentation_Form: document
Publication_Information:
Publication_Place: Albany, NY
Publisher: New York State Department of Environmental Conservation
Other_Citation_Details:
250UnconAq.html: 1. There are some landforms that were not mapped as part of a Primary Aquifer because of certain geological conditions. Cortland, for instance, has a round rock knob inclusion located within the outer Primary Aquifer boundary, but is not part of the aquifer.
2. The UnconsolidatedAquifers theme is not limited to the extent of primary aquifers.
3. The digitization involved folded paper maps, leading to an undetermined amount of distortion of the aquifer boundary. 4. Long Island data is not available because it was not included in the set of five 1:250,000 scale maps.
5. Updates are infrequent and are not planned.
Browse_Graphic:
Browse_Graphic_File_Name: dow_aquifers.jpg
Browse_Graphic_File_Description: Unconsolidated Aquifers of New York State- Sample data view
Browse_Graphic_File_Type: JPEG
Cross_Reference:
Citation_Information:
Title:
Unconsolidated Aquifers at 1:250,000 - Citation Block-Upstate NY (NYSDEC)
Originator: New York State Department of Environmental Conservation
Publication_Date: 20080229
Publication_Information:
Publication_Place: Albany, NY
Publisher: New York State Department of Environmental Conservation
Other_Citation_Details: 250UnconAqCitationB.html
Cross_Reference:
Citation_Information:
Title:
Unconsolidated Aquifers at 1:250,000 - Confined-Upstate NY (NYSDEC)
Originator: New York State Department of Environmental Conservation
Publication_Date: 20080229
Publication_Information:
Publication_Place: Albany, NY
Publisher: New York State Department of Environmental Conservation
Other_Citation_Details: 250UnconAqConfined.html
Native_Data_Set_Environment:
Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.2.2.1350

Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
Attribution was done by setting the transparency of the polygons in the UnconsolidatedAquifersMain layer at 50 and layering the raster base maps underneath. Each aquifer type classified in the source maps was assigned an index number, which was entered into the attribute table under a temporary field, "Type_ID." After all polygons were given this short integer identifier, a selection was done by attribute for each type. Using the "calculate values" function, all fields were populated for each aquifer type simply by entering the value once.
Logical_Consistency_Report:
All polygons are topologically correct, with no overlaps between unconfined aquifers and the geodatabase recognizing shared boundaries for all contiguous polygons.The aquifer boundary lines were brought into a topology with the "no dangles" rule and all flagged violations were fixed. Using the error inspector, extraneous line segments were deleted and gaps in the line work were closed by snapping nodes together. Extraneous polygons that formed inside doughnut holes in the desired polygons were manually selected and deleted. A topology with the "Must not Overlap" rule in place was created for the layer containing the unconfined aquifers, as well as the layer containing confined aquifers that lie underneath a surficial aquifer. No violations exist.
Completeness_Report:
All aquifers represented in the original USGS maps are contained in the vector dataset. The original maps did not include aquifers for Long Island, nor ones deemed too small to map at a 1:250,000 scale.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
These maps indicate only the general location of the unconsolidated aquifers; they are not intended for detailed site evaluations. Determination of the precise location of aquifer boundaries or of well yields may require additional data, according to authors of the source maps. Also, the poor state of the source paper maps led to further inaccuracies, with registration RMSE up to 189 meters.
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report: none
Lineage:
Process_Step:
Process_Description:
A paper copy of each of the 1:250,000 USGS maps was digitized by the Watershed Geographic Information Technology Section in the NYSDEC Division of Water. The use of folded paper maps led to poor precision of aquifer boundaries. Maps were scanned in 64 colors at 400 DPI. Contour lines and roads were removed using a combination of filters in PhotoShop and PaintShop Pro. All were converted to CMYK color; all channels but black were deleted. Two images were then converted to the bitmap format in Photoshop, grayscaled, despeckled and then cleaned further using the eraser tool. Paintshop Pro was used for bitmap conversion and despeckling for the remaining three images. They were then reopened in Photoshop to be cleaned with the eraser tool. Trial and error determined which method worked best for each image. Two vertical four-pixel wide seams (equivalent to about 50 meters) in the images created by slight offset between scanner cameras were stitched together using the offset filter in Photoshop for each of the following maps: Hudson-Mohawk, Niagara and Adirondack images. The images were each georeferenced with between 9 and 20 control points. The RMSE ranged from a low of 129 meters for the Niagara map to a high of 189 meters for the Finger Lakes map. The aquifer boundaries were then batch vectorized using the ArcScan extension in ArcGIS 8.3. Each map was vectorized separately, then manually edge matched using the snapping environment in the ArcMap editor. Settings used in ArcScan were Centerline, with gap tolerance of 4 and a fan angle of 45 degrees. All other settings used the defaults.
Dangles were cleaned from the line layers by building a topology through ArcCatalog.
Polygons were formed by the "create polygons from line feature class" in ArcCatalog. Confined aquifers lying beneath surficial aquifers were manually digitized using the "cut polygons" tool in ArcMap and placed in a separate theme, UnconsolidatedAquiferConfined. The reasons for this separation were twofold: merging confined aquifers lying beneath surficial aquifers with the polygons above resulted in difficulties selecting the desired polygon where two lay on top of one another; and stacking polygons in one layer also created problems because ArcMap toggles the "uppermost" polygon to the bottom each time an edit is made, thus affecting the symbology of the map.
A temporary "Type_ID' field was removed from UnconsolidatedAquifersMain's attribute table after aquifer types were populated in the "Type" field.
Finally, the Primary Aquifer regions appear as features in this theme as well as a separate theme altogether, UnconsolidatedAquifersCitationB.
Process_Date: 20061201
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: New York State Department of Environmental Conservation
Contact_Person: Division of Water; Bureau of Water Resource Management
Contact_Address:
Address_Type: mailing and physical address
Address: 625 Broadway
City: Albany
State_or_Province: NY
Postal_Code: 12233-3504
Country: USA
Address: 4th Floor
Contact_Voice_Telephone: 518-402-8298
Contact_Electronic_Mail_Address: watergis@gw.dec.state.ny.us
Hours_of_Service: 9am-4pm
Source_Used_Citation_Abbreviation: UNY250UnconAq
Source_Information:
Source_Citation:
Citation_Information:
Originator:
New York State Department of Environmental Conservation, Division of Water, Bureau of Water Resources Management
Publication_Date: 20080229
Title: Unconsolidated Aquifers at 1:250,000 - Upstate NY
Geospatial_Data_Presentation_Form: document
Publication_Information:
Publication_Place: Albany, NY
Publisher: NYSDEC
Source_Scale_Denominator: 250000
Type_of_Source_Media: paper
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 20080229
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: UNY250UnconAq
Source_Contribution:
This (Main) is a component of the overall UNY250UnconAq dataset.

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: 3091
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: G-polygon
Point_and_Vector_Object_Count: 21
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: G-polygon
Point_and_Vector_Object_Count: 182

Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:
Abscissa_Resolution: 0.000262
Ordinate_Resolution: 0.000262
Planar_Distance_Units: meters
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
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
Vertical_Coordinate_System_Definition:
Altitude_System_Definition:
Altitude_Encoding_Method:
Explicit elevation coordinate included with horizontal coordinates
Altitude_Resolution: 1.000000
Altitude_Datum_Name: NA
Altitude_Distance_Units: NA

Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: Unconsolidated Aquifers at 1:250,000 - Main-Upstate NY (NYSDEC)
Entity_Type_Definition: Polygon feature class
Entity_Type_Definition_Source: ESRI
Attribute:
Attribute_Label: SHAPE
Attribute_Definition: Feature geometry.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Unrepresentable_Domain: Coordinates defining the features.
Attribute:
Attribute_Label: YIELD
Attribute_Definition: Estimated potential yield of aquifer in gal/min, if known.
Attribute_Definition_Source: USGS
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1
Range_Domain_Maximum: 500
Attribute_Units_of_Measure: gallons per minute
Attribute:
Attribute_Label: TYPE
Attribute_Definition: Text description of aquifer type.
Attribute_Definition_Source: Source Maps
Attribute_Domain_Values:
Codeset_Domain:
Codeset_Name: Unconfined, Mid Yield
Codeset_Source: Source Maps
Attribute_Domain_Values:
Codeset_Domain:
Codeset_Name: Unconfined, High Yield
Codeset_Source: Source Maps
Attribute_Domain_Values:
Codeset_Domain:
Codeset_Name: Kame, Kame Terrace, Kame Moraine, Outwash or Alluvium
Codeset_Source: Source Maps
Attribute_Domain_Values:
Codeset_Domain:
Codeset_Name: Lacustrine or Eolian
Codeset_Source: Source Maps
Attribute_Domain_Values:
Codeset_Domain:
Codeset_Name: Moraine
Codeset_Source: Source Maps
Attribute_Domain_Values:
Codeset_Domain:
Codeset_Name: Confined, Unknown Depth and Thickness
Codeset_Source: Source Maps
Attribute_Domain_Values:
Codeset_Domain:
Codeset_Name: Confined, No Overlying Surficial Aquifer
Codeset_Source: Source Maps
Attribute_Domain_Values:
Codeset_Domain:
Codeset_Name: Primary Aquifer Region
Codeset_Source: Source Maps
Attribute_Domain_Values:
Codeset_Domain:
Codeset_Name: Unknown
Codeset_Source: Source Maps
Attribute:
Attribute_Label: PRIMARY_AQ
Attribute_Definition: Name of Primary Aquifer area.
Attribute_Definition_Source: Source Maps
Attribute_Domain_Values:
Unrepresentable_Domain: ASCII
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.
Attribute:
Attribute_Label: MAP_SYMBOL
Attribute_Definition:
Letter used in the source map to represent the different aquifer types amongst those with unknown or not well determined potential yield.
Attribute_Definition_Source: USGS
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: L
Enumerated_Domain_Value_Definition:
Lacustrine or eoloian deposit. Fine to medium sand that probably yields less than 10gal/min.
Enumerated_Domain_Value_Definition_Source: USGS
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: G
Enumerated_Domain_Value_Definition:
Kame, kame terrace, outwash or alluvium. Sand and gravel of unknown thickness or saturation. Yield potential is greater where streams are present.
Enumerated_Domain_Value_Definition_Source: USGS
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: M
Enumerated_Domain_Value_Definition:
Moraine-Mostly till and lacustrine deposits (fine sand, silt and clay) capped in some places with unsaturated sand and gravel. Thin, scattered confined aquifers of sand and gravel in some places.
Enumerated_Domain_Value_Definition_Source: USGS
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: U
Enumerated_Domain_Value_Definition:
Confined aquifer- Areas of lake deposits or till probably underlain by sand and gravel aquifers. Depth and saturated thickness of aquifers with the "U" designation were not investigated.
Enumerated_Domain_Value_Definition_Source: USGS
Attribute:
Attribute_Label: SHAPE.AREA
Attribute_Definition: Area
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Unrepresentable_Domain: Coordinates defining the features.
Attribute:
Attribute_Label: SHAPE.LEN
Attribute_Definition: Length
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Unrepresentable_Domain: Coordinates defining the features.
Overview_Description:
Entity_and_Attribute_Overview:
Dataset was created as a geodatabase. Three feature classes were created: UnconsolidatedAquifersMain, UnconsolidatedCitationB and UnconsolidatedConfined.
For ease of display and selection, confined aquifers which lie underneath surficial aquifer polygons were placed in a separate file: if a confined aquifer area lying underneath a surficial aquifer area were left merged with the other overlying, polygons difficulties in selecting the desired polygon ocurred; stacking the aquifer area polygons in one layer also created problems because ArcMap toggles the "uppermost" polygon to the bottom every time an edit is made, thus affecting the symbology of the map. UnconsolidatedCitationB layer is also represented in the UnconsolidatedAquifersMain layer, but it can be used as a standalone dataset. Each polygon corresponds to one Primary Aquifer area. Attribute information includes the name of the Primary Aquifer area. A polygon in the UnconsolidatedAquiferMain layer is defined as "unknown" ('Type' attribute) because it's type wasn't defined in the source maps.
Entity_and_Attribute_Detail_Citation: NYSDEC

Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: NYS Cyber Security and Critical Infrastructure Coordination
Contact_Address:
Address_Type: mailing and physical address
Address: 30 South Pearl Street
City: Albany
State_or_Province: NY
Postal_Code: 12007-3425
Country: USA
Contact_Voice_Telephone: 607-255-5406
Contact_Electronic_Mail_Address: nysgis@cscic.state.ny.us
Contact_Position: NYS GIS Clearinghouse
Resource_Description: Unconsolidated Aquifers of Upstate New York at 1:250,000
Distribution_Liability:
The New York State Department of Environmental Conservation (NYSDEC) provides these geographic data "as is". NYSDEC makes no guarantee or warranty concerning the accuracy of information contained in the geographic data. NYSDEC further makes no warranty, either expressed or implied, regarding the condition of the product or its fitness for any particular purpose. The burden for determining fitness for use lies entirely with the user. Although these data have been processed successfully on a computer system at NYSDEC, no warranty expressed or implied is made regarding the accuracy or utility of the data on any other system or for general or scientific purposes. This disclaimer applies both to individual use of the data and aggregate use with other data. It is strongly recommended that careful attention be paid to the contents of the metadata file associated with these data. NYSDEC shall not be held liable for improper or incorrect use of the data described and/or contained herein.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: Shape
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
<http://www.nysgis.state.ny.us/gisdata/inventories/member.cfm?OrganizationID=529>
Fees: None

Metadata_Reference_Information:
Metadata_Date: 20080328
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: New York State Department of Environmental Conservation
Contact_Person: Division of Information Services; GIS Unit
Contact_Address:
Address_Type: mailing and physical address
Address: 625 Broadway
Address: 3rd Floor
City: Albany
State_or_Province: NY
Postal_Code: 12233-2750
Country: USA
Contact_Voice_Telephone: 518-402-9860
Contact_Facsimile_Telephone: 518-402-9031
Contact_Electronic_Mail_Address: 518-402-9031
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

Generated by mp version 2.9.1 on Fri Mar 28 10:18:33 2008