Magnetic Anomalies of New Jersey

Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator:Suhas L. Ghatge, NJDEP, N. J. Geological Survey
Publication_Date: 06012004
Title: Magnetic Anomalies of New Jersey
Geospatial_Data_Presentation_Form: vector digital data
Series_Information:
Series_Name: NJGS Digital Geodata Series
Issue_Identification: DGS04-3
Publication_Information:
Publication_Place: Trenton, NJ
Publisher: NJ Geological Survey
Online_Linkage: www.state.nj.us/dep/njgs/\geodata\dgs04-3.htm
Description:
Abstract:
Magnetic anomalies are produced by variations in the distribution of iron minerals, usually magnetite, in the rocks of the Earth's crust. Igneous and metamorphic rocks can be very magnetic. By comparison, sedimentary rocks are usually nonmagnetic. Magnetic anomalies therefore provide a way of mapping exposed and buried crystalline rocks.

Magnetic Anomalies of New Jersey contains a GIS shapefile of magnetic contours as polygons, at 100 gamma intervals. The contours are based on magnetic data in New Jersey and vicinity. The New Jersey contours were clipped at the state outline.The magnetic anomalies at 100-gamma intervals have lows ranging from -200 to -300 gammas and highs ranging from +1200 to +1300 gammas. A regional gradient was removed by using a corrected geomagnetic reference field. For New Jersey the field is 55,000 - 56000 gammas.

Purpose:
To provide information on the magnetic anomalies in New Jersey and useful for geologic interpretations.
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 2004
Currentness_Reference: publication date
Status:
Progress: In work
Maintenance_and_Update_Frequency: As needed
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -75.587306
East_Bounding_Coordinate: -73.890363
North_Bounding_Coordinate: 41.357564
South_Bounding_Coordinate: 38.924819
Keywords:
Theme:
Theme_Keyword_Thesaurus: anomaly
Theme_Keyword: magnetic
Theme_Keyword: anomalies
Theme_Keyword: gamma
Theme_Keyword: nanoTesla
Place:
Place_Keyword: New Jersey
Access_Constraints: none
Use_Constraints:
New Jersey Department of Environmental Protection (NJDEP), Data Distribution Agreement

I. Description of Data to be Provided. The Data provided herein are distributed subject to the following conditions and restrictions. SUBJECT DATA LAYERS For all data contained herein, NJDEP makes no representations of any kind, including, but not limited to, the warranties of merchantability or fitness for a particular use, nor are any such warranties to be implied with respect to the digital data layers furnished hereunder. NJDEP assumes no responsibility to maintain them in any manner or form.

II. Terms of Agreement 1. Digital data received from the NJDEP are to be used solely for internal purposes in the conduct of daily affairs.

2. The data are provided, as is, without warranty of any kind and the user is responsible for understanding the accuracy limitations of all digital data layers provided herein, as documented in the accompanying cross-reference files (see Section 1.14 CROSS_REFERENCE). Any reproduction or manipulation of the above data must ensure that the coordinate reference system remains intact.

3. Digital data received from the NJDEP may not be reproduced or redistributed for use by anyone without first obtaining written permission from the NJDEP. This clause is not intended to restrict distribution of printed mapped information produced from the digital data.

4. Any maps, publications, reports, or other documents produced as a result of this project that utilize NJDEP digital data will credit the NJDEP's Geographic Information System (GIS) as the source of the data with the following credit/disclaimer: "This (map/publication/report) was developed using New Jersey Department of Environmental Protection Geographic Information System digital data, but this secondary product has not been verified by NJDEP and is not state-authorized."

5. Users shall require any independent contractor, hired to undertake work that will utilize digital data obtained from the NJDEP, to agree not to use, reproduce, or redistribute NJDEP GIS data. Data utilized by an independent contractor will be required to be returned to the original user at the close of such contractual work. Users hereby agree to abide by the use and reproduction conditions specified above and agree to hold any independent contractor to the same terms. By using data provided herein, the user acknowledges that terms and conditions have been read and that the user is bound by these criteria.

Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Suhas L. Ghatge
Contact_Organization: NJDEP, N.J. Geological Survey
Contact_Position: Research Scientist
Contact_Address:
Address_Type: mailing and physical address
Address: 29 Arctic Parkway, Box 427
City: Trenton
State_or_Province: New Jersey
Postal_Code: 08625
Country: USA
Contact_Voice_Telephone: (609) 292-1185
Contact_Facsimile_Telephone: (609) 633-1004
Contact_Electronic_Mail_Address: Suhas.Ghatge@dep.nj.gov
Native_Data_Set_Environment:
Microsoft Windows 2000 Version 5.0 (Build 2195) Service Pack 4; ESRI ArcCatalog 8.3.0.800
Cross_Reference:
Citation_Information:
Originator: NJDEP, NJ Geological Survey
Publication_Date: 2004
Title: Magnetic Anomaly Map of New Jersey and Vicinity
Series_Information:
Series_Name: NJGS Open-file Map
Issue_Identification: OFM 57
Publication_Information:
Publication_Place: Trenton, New Jersey
Publisher: NJ Geological Survey
Online_Linkage: <http://www.state.nj.us/dep/njgs/pricelst/ofmap/ofm57.pdf>

Data_Quality_Information:
Lineage:
Source_Information:
Type_of_Source_Media: CD-ROM
Source_Citation_Abbreviation: USGS DDS-9
Source_Contribution:
Phillips, J. D., Duval, J. S., and Ambroziak, R. A., 1993, National Geophysical Data Grids: Gamma-Ray, Gravity, Magnetic, and Topographic Data for the Counterminous United States, U. S. Geological Survey Digital Data Series DDS-9.

Bond, K.R., and Zietz, Isidore, 1987, Composite magnetic anomaly map of the conterminous United States west of 96 degrees longitude: U.S. Geological Survey Geophysical Investigations Map GP-977, 2 sheets, scale 1:2,500,000, 13-p. text.

Geological Society of America, Committee for the Magnetic Anomaly Map of North America, 1987, Magnetic anomaly map of North America: Geological Society of America, scale 5,000,000.

Godson, R.H., 1986, Description of magnetic tape containing conterminous United States magnetic data in a gridded format: National Technical Information Service Report PB86-197423, 5 p., magnetic tape.

Hinze, W.J., and Zietz, Isidore, 1985, The composite magnetic-anomaly map of the conterminous United States, in Hinze, W.J., ed., The utility of regional gravity and magnetic anomaly maps: Tulsa, Okla., Society of Exploration Geophysicists, p. 1-24.

U.S. Geological Survey, 1982, Composite magnetic anomaly map of the United States; Part A--Conterminous United States: U.S. Geological Survey Geophysical Investigations Map GP-954-A, 2 sheets, scale 1:2,500,000, 59-p. text.

Webring, M. W., 1981, MINC-- A gridding program based on minimum curvature: U. S. Geological Survey Open-File Report 81-1224, 41 p.

Process_Step:
Process_Description:
Magnetic data obtained from the U.S Geological Survey DDS-9 (1993) were used to extract data for New Jersey and vicinity. The grid of magnetic anomaly data for the conterminous United States and adjacent marine areas (Godson, 1986) was created from digitized contours of the east half of the Composite Magnetic Anomaly Map of the United States, Part A (U.S. Geological Survey, 1982), and the Composite Magnetic Anomaly Map of the Conterminous United States West of 96 Degrees Longitude (Bond and Zietz, 1987), with additional data used in the compilation of the Magnetic Anomaly Map of North America (Geological Society of America, Committee for the Magnetic Anomaly Map of North America, 1987). A regional gradient present in the 1982 map was removed by using a corrected geomagnetic reference field (Godson, 1986).

The data, originally gridded on a 2-km interval using the spherical Transverse Mercator projection of the Magnetic Anomaly Map of North America, were reprojected to the Albers projection used on this CD-ROM and regridded on a 2-km interval using a minimum curvature gridding program (Webring, 1981). An interpretation of the 1982 anomaly map was presented by Hinze and Zietz (1985).

The grid was converted to New Jersey State Plane feet.The magnetic values were gridded (kriging) and contoured. The contoured data were converted to DXF file format and exported to ESRI's ARCINFO polygon coverage. The polygon coverage was then converted to shape file using ESRI's ArcView 3.2. Each polygon was assigned a range of contour values in gammas or NanoTeslas. Then using the New Jersey state outline New Jersey contours were clipped from data from the surrounding states for this shape file.

Process_Date: 1999
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Suhas L. Ghatge
Contact_Organization: NJDEP, N.J. Geological Survey
Contact_Address:
Address_Type: mailing and physical address
Address: 29 Arctic Parkway, Box 427
City: Trenton
State_or_Province: New Jersey
Postal_Code: 08625
Country: USA
Contact_Voice_Telephone: (609) 292-1185
Contact_Facsimile_Telephone: (609) 633-1004
Contact_Electronic_Mail_Address: Suhas.Ghatge@dep.nj.gov

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: 147

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: 2900
Transverse_Mercator:
Scale_Factor_at_Central_Meridian: 0.999900
Longitude_of_Central_Meridian: -74.500000
Latitude_of_Projection_Origin: 38.833333
False_Easting: 492125.000000
False_Northing: 0.000000
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:
Abscissa_Resolution: 0.002048
Ordinate_Resolution: 0.002048
Planar_Distance_Units: survey feet
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

Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: nj-aeromag
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: AEROMAG3_
Attribute:
Attribute_Label: AEROMAG3_I
Attribute:
Attribute_Label: RANGE
Attribute_Definition: 100-gamma interval of magnetic values
Attribute_Definition_Source: NJGS
Attribute:
Attribute_Label: SYMBOL
Attribute_Definition: color symbol for plotting
Attribute_Definition_Source: NJGS

Distribution_Information:
Distributor:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Suhas L. Ghatge
Contact_Organization: NJDEP, NJ Geological Survey
Contact_Address:
Address_Type: mailing and physical address
Address: 29 Arctic Parkway, Box 427
City: Trenton
State_or_Province: New Jersey
Postal_Code: 098625
Country: USA
Contact_Voice_Telephone: (609) 292-1185
Contact_Facsimile_Telephone: (609) 633-1004
Contact_Electronic_Mail_Address: Suhas.Ghatge@dep.nj.gov
Resource_Description: Downloadable Data
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Transfer_Size: 0.432

Metadata_Reference_Information:
Metadata_Date: 20040527
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: NJDEP, NJ Geologcal Survey
Contact_Person: Suhas L. Ghatge
Contact_Address:
Address_Type: mailing and physical address
Address: 29 Arctic Parkway
City: Trenton
State_or_Province: New Jersey
Postal_Code: 08625
Country: USA
Contact_Voice_Telephone: (609)292-1185
Contact_Facsimile_Telephone: (6090633-1004
Contact_Electronic_Mail_Address: Suhas.Ghatge@dep.nj.gov
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 2.7.33 on Thu May 27 10:48:29 2004