Great Sand Dunes, Colorado

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Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator:
U.S. Geological Survey, Department of Interior and the National Geophysical Data Center, NOAA
Publication_Date: 2012
Title: Great Sand Dunes, Colorado
Geospatial_Data_Presentation_Form: tabular digital data
Online_Linkage: https://mrdata.usgs.gov/magnetic/show-survey.php?id=CO_4322
Description:
Abstract:
Aeromagnetic data were collected along flight lines by instruments in an aircraft that recorded magnetic-field values and locations. This dataset presents latitude, longitude, altitude, and magnetic-field values.
Purpose:
Aeromagnetic surveys are used for geophysical prospecting. Some variations in magnetic measurements are caused by rocks that contain significant amounts of magnetic minerals (magnetite being the most common). These anomalies reflect variations in the amount and type of magnetic material and the shape and depth of the body of rock. The features and patterns of aeromagnetic anomalies can also be used to delineate details of subsurface geology including the locations of buried faults and the thickness of surficial sedimentary rocks.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20081006
Ending_Date: 20081025
Currentness_Reference:
Time period indicates dates of airborne survey data collection. Time period is expressed in the format YYYYMM or YYYYMMDD when further accuracy is available.
Status:
Progress: complete
Maintenance_and_Update_Frequency: none planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -105.68
East_Bounding_Coordinate: -105.49
North_Bounding_Coordinate: 37.85
South_Bounding_Coordinate: 37.52
Data_Set_G-Polygon:
Data_Set_G-Polygon_Outer_G-Ring:
G-Ring:
-105.68 37.85, -105.57 37.85, -105.51 37.82, -105.49 37.80, -105.49 37.73, -105.55 37.62, -105.56 37.56, -105.53 37.54, -105.50 37.53, -105.50 37.52, -105.67 37.52, -105.67 37.82, -105.68 37.85
Keywords:
Theme:
Theme_Keyword_Thesaurus: none
Theme_Keyword: geophysical surveys
Theme_Keyword: aeromagnetic data
Theme_Keyword: airborne surveys
Theme_Keyword: magnetic surveys
Theme_Keyword: residual magnetic field
Theme_Keyword: total field
Theme_Keyword: magnetic
Place:
Place_Keyword_Thesaurus: none
Place_Keyword: United States
Place_Keyword: Colorado
Place_Keyword: CO
Place_Keyword: Great Sand Dunes
Access_Constraints: none
Use_Constraints:
none. Acknowledgement of the U.S. Geological Survey and the National Geophysical Data Center would be appreciated in products derived from these data.
Data_Set_Credit:
These USGS employees contributed to reformatting and archiving these data: Bob Kucks, Pat Hill
Native_Data_Set_Environment: These data were originally recorded on CD_ROM's.
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
The data in this file have been processed using various formulas and methods that are not usually documented but that represent industry standard practices for airborne data reduction. See operations report for discussion on data acquisition and processing.
Logical_Consistency_Report:
The data in this file were collected by a single contractor or group who were responsible for collecting and processing the data. The data from this survey were collected using the same instruments (magnetometers, altimeters, navigational systems) throughout the survey and were collected in a normal length of time with no long delays between survey beginning and end. Survey contracts specified the conditions and specifications under which these data were collected. Standard industry practices of the time were followed in data collection and processing.
Completeness_Report:
Loss of data due to poor transmission, channel dropout, obvious spiking, missing channels, and other obvious errors may have been replaced with the value -9999.9.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
Horizontal positions of the survey aircraft used to collect data were determined using GPS satellite navigation.
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report:
The aircraft vertical position was determined using the navigational positioning equipment on the aircraft, which were radar altimeter and barometric altimeter. Radar altimeters are estimated to have an error of 2-5% of the altitude (Richard Hansen, PRJ, Inc., written communication).
Barometric altimeters are quite accurate, but are typically operated in an uncorrected mode. The diurnal variation in air pressure over the course of a flight can produce a 50-100 ft error in the barometric altimeter reading. In addition, pressure microcells create short- period air pressure changes equivalent to about 10 ft. under typical conditions (Richard Hansen, PRJ, Inc., written communication) This data set was collected as a draped survey having an average terrain clearance of 330 ft. Because aircraft cannot safely maintain a constant terrain clearance, error in vertical position is introduced.
Lineage:
Process_Step:
Process_Description:
Conversion of measured values to geographic position and magnetic values was performed by the contractor using industry standard practices.
Process_Date: 2008
Process_Step:
Process_Description:
USGS personnel used the software package Oasis Montaj by Geosoft, Inc., to read in the original contractor's data. Few, if any, corrections were made to the original data. Minor changes may have been made to the original format. A readme.txt file was created to outline the format of the .xyz file.
Process_Date: 200908
Entity_and_Attribute_Information:
Overview_Description:
Entity_and_Attribute_Overview:
Airborne survey specifications These items are constant for the entire survey Project number: 4322 Project name: Great Sand Dunes, Colorado Survey flown by: Upper Limit Aviation Survey flown for: U.S. Geological Survey Approx. no. of line miles: 2267 Survey height: 330 ft Altitude method: Draped over terrain Flight-line spacing: 0.09 mi Flight-line direction: E-W Aircraft used: Bell 206 B3 helicopter Airport - arrival: Alamosa, CO Airport - departure: Alamosa, CO Stinger length: unknown Magnetometer used: Scintrex CS-3 Cesium Data recording interval: 0.1 second Regional field removed: IGRF 2005
Entity_and_Attribute_Detail_Citation:
Nettleton, L.L., 1971, Elementary Gravity and Magnetics for Geologists and Seismologists: Society of Exploration Geophysicists Monograph Series No. 1. Dobrin, M.B., 1976, Introduction to Geophysical Prospecting: New York, McGraw-Hill Book Company, Sheriff, R.E., 1984, Encyclopedic dictionary of exploration geophysics: Tulsa, OK, Society of Exploration Geophysicists.
Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:
Web site administration: U.S Geological Survey Publishing Service Center
Contact_Address:
Address_Type: mailing address
Address:
Publishing Service Center
USGS MS 902, Box 25046 DFC
City: Denver
State_or_Province: CO
Postal_Code: 80225-0046
Contact_Voice_Telephone: 303-236-5486
Distribution_Liability:
Although all data published on this web site have been used by the USGS, no warranty, expressed or implied, is made by the USGS as to the accuracy of the data and related materials. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of these data or related materials. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: ASCII
Format_Specification: See the project readme.txt file for the data format.
File_Decompression_Technique: gunzip
Format_Version_Number: unknown
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
Fees: none
Metadata_Reference_Information:
Metadata_Date: 20111031
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: USGS Crustal Geophysics and Geochemistry Science Center
Contact_Address:
Address_Type: mailing address
Address:
Magnetic and Gravity Information
U.S. Geological Survey
Box 25046 Mail Stop 964
Denver Federal Center
City: Denver
State_or_Province: CO
Postal_Code: 80225-0046
Contact_Voice_Telephone: 303-236-5652
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998

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