Digital map of hydrothermal alteration type, key mineral groups, and green vegetation of the northwestern United States derived from automated analysis of ASTER satellite data

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Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: Rockwell, Barnaby W.
Originator: Bonham, Lindsey C.
Publication_Date: 2017
Title:
Digital map of hydrothermal alteration type, key mineral groups, and green vegetation of the northwestern United States derived from automated analysis of ASTER satellite data
Edition: 1.0
Geospatial_Data_Presentation_Form: Raster digital data
Series_Information:
Series_Name: USGS data release
Issue_Identification: 10.5066/F7CR5RK7
Publication_Information:
Publication_Place: Denver, CO
Publisher: U.S. Geological Survey
Online_Linkage: https://doi.org/10.5066/F7CR5RK7
Description:
Abstract:
Mineral groups identified through automated analysis of remote sensing data acquired by the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) were used to generate a map showing the type and spatial distribution of hydrothermal alteration, other exposed mineral groups, and green vegetation across the northwestern conterminous United States. Boolean algebra was used to combine mineral groups identified through analysis of visible, near-infrared, and shortwave-infrared ASTER data into attributed alteration types and mineral classes based on common mineralogical definitions of such types and the minerals present within the mineral groups. Alteration types modeled in this way can be stratified relative to acid producing and neutralizing potential to aid in geoenvironmental watershed studies. This mapping was performed in support of multidisciplinary studies involving the predictive modeling of mineral deposit occurrence and geochemical environments at watershed to regional scales. These studies seek to determine the relative effects of mining and non-anthropogenic hydrothermal alteration on watershed surface water geochemistry and faunal populations. The presence or absence of hydrothermally-altered rocks and (or) specific mineral groups can be used to model the favorability of occurrence of certain types of mineral deposits, and aid in the delineation of permissive tracts for these deposits. These data were used as a data source for the U.S. Geological Survey (USGS) Sagebrush Mineral-Resource Assessment (SaMiRA). This map, in ERDAS Imagine (.img) format, has been attributed by pixel value with material identification data that can be queried in most image processing and GIS software packages. Three files are included with this product: file with .img extension contains thematic image attributes and geographic projection data, file with .ige extension contains the raster data, and the file with .rrd extension includes pyramid data for fast display.
Purpose:
The purpose of the image is to display the spatial distribution of hydrothermal alteration types, key mineral groups, and green vegetation modeled by automated analysis of ASTER satellite remote sensing data covering the northwestern United States.
Supplemental_Information:
These data represent version 2 of the mosaic of the northwestern U.S. produced on June 11, 2013 using algorithm build AA61.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20000501
Ending_Date: 20071001
Currentness_Reference: ground condition
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -125.119620923
East_Bounding_Coordinate: -98.9894527256
North_Bounding_Coordinate: 49.5956281265
South_Bounding_Coordinate: 40.7688227906
Keywords:
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Categories
Theme_Keyword: geoscientificInformation
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: propylitic
Theme_Keyword: mineral mapping
Theme_Keyword: ASTER
Theme_Keyword: advanced argillic
Theme_Keyword: hydrothermal alteration type
Theme_Keyword: phyllic
Theme_Keyword: remote sensing
Theme_Keyword: epithermal
Place:
Place_Keyword_Thesaurus: Common geographic areas
Place_Keyword: Washington
Place_Keyword: North Dakota
Place_Keyword: Oregon
Place_Keyword: Montana
Place_Keyword: Idaho
Place_Keyword: Wyoming
Place_Keyword: Nebraska
Place_Keyword: South Dakota
Place:
Place_Keyword_Thesaurus: None
Place_Keyword: United States
Access_Constraints: None
Use_Constraints:
Acknowledgement of the U.S. Geological Survey would be appreciated in products derived from these data. Data have been checked to ensure the accuracy of the data. If any errors are detected, please notify the originating office. The U.S. Geological Survey strongly recommends that careful attention be paid to the metadata file associated with these data. Although this Federal Geographic Data Committee-compliant metadata file is intended to document the data set in nonproprietary form, as well as in ArcGIS and ERDAS Imagine formats, this metadata file may include some terminology specific to those software packages.
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: Barnaby W. Rockwell
Contact_Position: Research Geophysicist
Contact_Address:
Address_Type: Mailing
Address: Box 25046, Mail Stop 973
City: Denver
State_or_Province: Colorado
Postal_Code: 80225
Country: US
Contact_Voice_Telephone: 303-236-1851
Native_Data_Set_Environment:
Environment as of Metadata Creation: Microsoft Windows 7 Version 6.1 (Build 7601) Service Pack 1; Esri ArcGIS 10.4.1 (Build 5686) Service Pack N/A (Build N/A)
Cross_Reference:
Citation_Information:
Originator: Rockwell, Barnaby W.
Publication_Date: 20110101
Title:
Description and validation of an automated methodology for mapping mineralogy, vegetation, and hydrothermal alteration type from ASTER satellite imagery with examples from the san juan mountains, Colorado
Series_Information:
Series_Name: Scientific Investigations Map
Issue_Identification: 3190
Publication_Information:
Publication_Place: Denver, CO
Publisher: U.S. Geological Survey
Online_Linkage: https://pubs.usgs.gov/sim/3190
Data_Quality_Information:
Lineage:
Process_Step:
Process_Description:
Methods used to derive these data are described in https://pubs.usgs.gov/sim/3190/contents/SIM3190_pam.pdf .
Process_Date: 2013
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Raster
Raster_Object_Information:
Raster_Object_Type: Grid Cell
Row_Count: 32699
Column_Count: 68458
Vertical_Count: 1
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Geographic:
Latitude_Resolution: 0.000269941139971
Longitude_Resolution: 0.000381696342245
Geographic_Coordinate_Units: Decimal seconds
Geodetic_Model:
Horizontal_Datum_Name: D_WGS_1984
Ellipsoid_Name: WGS_1984
Semi-major_Axis: 6378137.0
Denominator_of_Flattening_Ratio: 298.257223563
Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: aster_northwest_aa61_v2_6-11-13.img.vat
Entity_Type_Definition:
Table containing attribute information associated with the data set.
Entity_Type_Definition_Source: Producer defined
Attribute:
Attribute_Label: OID
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: Value
Attribute_Definition: Internal digital number
Attribute_Definition_Source: Author
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0
Range_Domain_Maximum: 255
Attribute:
Attribute_Label: Count
Attribute_Definition: Value frequency count
Attribute_Definition_Source: Author
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0
Range_Domain_Maximum: 454432322
Attribute:
Attribute_Label: Red
Attribute_Definition: Red value of color table
Attribute_Definition_Source: Author
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0
Range_Domain_Maximum: 1
Attribute:
Attribute_Label: Green
Attribute_Definition: Green value of color table
Attribute_Definition_Source: Author
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0
Range_Domain_Maximum: 1
Attribute:
Attribute_Label: Blue
Attribute_Definition: Blue value of color table
Attribute_Definition_Source: Author
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0
Range_Domain_Maximum: 1
Attribute:
Attribute_Label: Opacity
Attribute_Definition:
Opacity of value - denotes whether or not a material ID has been assigned
Attribute_Definition_Source: Author
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0
Range_Domain_Maximum: 1
Attribute:
Attribute_Label: MaterialID
Attribute_Definition:
Material(s) identified in a pixel. Enumerated_Domain_Values correspond to the internal digital number values of the "Value" attribute.
Attribute_Definition_Source: Author
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 0
Enumerated_Domain_Value_Definition: No materials classified
Enumerated_Domain_Value_Definition_Source: Author
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 1
Enumerated_Domain_Value_Definition: Minor ferric iron
Enumerated_Domain_Value_Definition_Source: Author
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 2
Enumerated_Domain_Value_Definition: Major ferric iron
Enumerated_Domain_Value_Definition_Source: Author
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 3
Enumerated_Domain_Value_Definition: Advanced argillic +/- ferric iron
Enumerated_Domain_Value_Definition_Source: Author
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 4
Enumerated_Domain_Value_Definition:
Argillic (kandite clay +/- sericite +/- smectite) +/- minor advanced argillic
Enumerated_Domain_Value_Definition_Source: Author
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 5
Enumerated_Domain_Value_Definition: Sericite and (or) smectite
Enumerated_Domain_Value_Definition_Source: Author
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 6
Enumerated_Domain_Value_Definition: Carbonate-propylitic
Enumerated_Domain_Value_Definition_Source: Author
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 7
Enumerated_Domain_Value_Definition:
Dolomite (may include Mg/Fe-OH phyllosilicates or epidote in igneous and metamorphic terranes)
Enumerated_Domain_Value_Definition_Source: Author
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 8
Enumerated_Domain_Value_Definition:
Jarosite +/- sericite +/- smectite, or hydrous silica + ferric iron
Enumerated_Domain_Value_Definition_Source: Author
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 9
Enumerated_Domain_Value_Definition: Hydrous silica
Enumerated_Domain_Value_Definition_Source: Author
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 10
Enumerated_Domain_Value_Definition: Sericite + chlorite or Fe/Mg sericite
Enumerated_Domain_Value_Definition_Source: Author
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 11
Enumerated_Domain_Value_Definition:
Argillic + ferric iron or weathered phyllic +/- minor advanced argillic
Enumerated_Domain_Value_Definition_Source: Author
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 12
Enumerated_Domain_Value_Definition:
Sericite and (or) smectite + ferric iron (may include fresh phyllic)
Enumerated_Domain_Value_Definition_Source: Author
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 13
Enumerated_Domain_Value_Definition: Carbonate-propylitic + sericite and (or) smectite
Enumerated_Domain_Value_Definition_Source: Author
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 14
Enumerated_Domain_Value_Definition: Green vegetation
Enumerated_Domain_Value_Definition_Source: Author
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 15
Enumerated_Domain_Value_Definition: Carbonate-propylitic + ferric iron
Enumerated_Domain_Value_Definition_Source: Author
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 16
Enumerated_Domain_Value_Definition: Sericite + chlorite or Fe/Mg sericite + ferric iron
Enumerated_Domain_Value_Definition_Source: Author
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 17
Enumerated_Domain_Value_Definition: Carbonate-propylitic + sericite and (or) smectite + ferric iron
Enumerated_Domain_Value_Definition_Source: Author
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 18
Enumerated_Domain_Value_Definition:
Dolomite + ferric iron (may include Mg/Fe-OH phyllosilicates or epidote in igneous and metamorphic terranes)
Enumerated_Domain_Value_Definition_Source: Author
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 19
Enumerated_Domain_Value_Definition:
Carbonate-propylitic +/- hydrous silica (may include some dolomite)
Enumerated_Domain_Value_Definition_Source: Author
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 20
Enumerated_Domain_Value_Definition:
Carbonate-propylitic +/- hydrous silica + ferric iron (may include some dolomite)
Enumerated_Domain_Value_Definition_Source: Author
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 21
Enumerated_Domain_Value_Definition:
Ferrous or coarse-grained ferric iron (may include oxidized basalts, fire ash, some moist soils, and any blue/green rocks)
Enumerated_Domain_Value_Definition_Source: Author
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 22
Enumerated_Domain_Value_Definition: Carbonate-propylitic + ferrous or coarse-grained ferric iron
Enumerated_Domain_Value_Definition_Source: Author
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 23
Enumerated_Domain_Value_Definition:
Dolomite + ferrous or coarse-grained ferric iron (may include Mg/Fe-OH phyllosilicates or epidote in igneous and metamorphic terranes)
Enumerated_Domain_Value_Definition_Source: Author
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 45
Enumerated_Domain_Value_Definition:
Dry vegetation in fallow agricultural fields - deep 2.17 and 2.20 micron absorption (identified as argillic, class 4, yellow)
Enumerated_Domain_Value_Definition_Source: Author
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 46
Enumerated_Domain_Value_Definition:
Dry, yellow/brown veg. in fallow agricultural fields - 2.17 and 2.20 micron absorption (identified as argillic + Fe, class 11, orange)
Enumerated_Domain_Value_Definition_Source: Author
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 47
Enumerated_Domain_Value_Definition:
Dry vegetation in fallow agricultural fields - deep 2.17 micron absorption (identified as advanced argilllic, class 3, red)
Enumerated_Domain_Value_Definition_Source: Author
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 48
Enumerated_Domain_Value_Definition: No data (clouds, cloud shadow, smoke, haze, data errors)
Enumerated_Domain_Value_Definition_Source: Author
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 49
Enumerated_Domain_Value_Definition:
Semi-corrupted SWIR band 5: identified advanced argillic and argillic alteration may be unreliable
Enumerated_Domain_Value_Definition_Source: Author
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 50
Enumerated_Domain_Value_Definition:
Semi-corrupted SWIR band 7: identified dolomite, hydrous silica, and jarosite may be unreliable
Enumerated_Domain_Value_Definition_Source: Author
Overview_Description:
Entity_and_Attribute_Overview:
Results of merging of mineral groups identified through automated analysis of ASTER multispectral data. The digital number (DN) values in this image have been attributed by modeled alteration type, mineral group, or green vegetation as shown in the following table. Each DN value corresponds to a particular color in the included color table. All pixels identified as a particular alteration type or mineral group have been assigned a single, discrete color. Pixels with a DN value of zero indicate either that no materials were identified or that no input spectral data were available. There are no DN data values in the range of 24-44 or greater than 50.

Value  Count Red   Green Blue  Opacity MaterialID
 1  18455527 1     0.749 0.8   1       Minor ferric iron
 2    719220 0.929 0.51  0.929 1       Major ferric iron
 3   2595880 1     0     0     1       Advanced argillic +/- ferric iron
 4   2137365 1     1     0     1       Argillic (kandite clay +/- sericite +/- smectite) +/- minor advanced argillic
 5  78094642 0.129 0.788 0.718 1       Sericite and (or) smectite
 6   2140915 0     1     0     1       Carbonate-propylitic
 7    898039 0     0     1     1       Dolomite (may include Mg/Fe-OH phyllosilicates or epidote in igneous and metamorphic terranes)
 8    203441 1     0     1     1       Jarosite +/- sericite +/- smectite, or hydrous silica + ferric iron
 9   2549741 0.588 0.247 0.8   1       Hydrous silica
10   1397612 0.298 0.62  0.42  1       Sericite + chlorite or Fe/Mg sericite
11    916940 1     0.647 0     1       Argillic + ferric iron or weathered phyllic +/- minor advanced argillic
12  32659247 0     1     1     1       Sericite and (or) smectite + ferric iron (may include fresh phyllic)
13    576976 0.82  0.71  0.549 1       Carbonate-propylitic + sericite and (or) smectite
14 454432322 0     0.388 0     1       Green vegetation
15   1328216 0.647 0.157 0.157 1       Carbonate-propylitic + ferric iron
16    252995 0.62  0.749 0.129 1       Sericite + chlorite or Fe/Mg sericite + ferric iron
17   5395824 0.859 0.557 0.486 1       Carbonate-propylitic + sericite and (or) smectite + ferric iron
18    140119 0.576 0.737 0.878 1       Dolomite + ferric iron (may include Mg/Fe-OH phyllosilicates or epidote in igneous and metamorphic terranes)
19      9170 0.639 0.6   0.808 1       Carbonate-propylitic +/- hydrous silica (may include some dolomite)
20       555 0.71  0.576 0.808 1       Carbonate-propylitic +/- hydrous silica + ferric iron (may include some dolomite)
21  15910210 0.357 0.447 0.498 1       Ferrous or coarse-grained ferric iron (may include oxidized basalts, fire ash, some moist soils, and any blue/green rocks)
22    123166 0.486 0.486 0.188 1       Carbonate-propylitic + ferrous or coarse-grained ferric iron
23     50824 0.22  0.486 0.737 1       Dolomite + ferrous or coarse-grained ferric iron (may include Mg/Fe-OH phyllosilicates or epidote in igneous and metamorphic terranes)
24         0 0     0     0     1
25         0 0     0     0     1
26         0 0     0     0     1
27         0 0     0     0     1
28         0 0     0     0     1
29         0 0     0     0     1
30         0 0     0     0     1
31         0 0     0     0     1
32         0 0     0     0     1
33         0 0     0     0     1
34         0 0     0     0     1
35         0 0     0     0     1
36         0 0     0     0     1
37         0 0     0     0     1
38         0 0     0     0     1
39         0 0     0     0     1
40         0 0     0     0     1
41         0 0     0     0     1
42         0 0     0     0     1
43         0 0     0     0     1
44         0 0     0     0     1
45    176399 0.4   0.2   0.086 1       Dry vegetation in fallow agricultural fields - deep 2.17 and 2.20 micron absorption (identified as argillic, class 4, yellow)
46    159482 0.529 0.239 0.11  1       Dry, yellow/brown veg. in fallow agricultural fields - 2.17 and 2.20 micron absorption (identified as argillic + Fe, class 11, orange)
47    451561 0.627 0.318 0.176 1       Dry vegetation in fallow agricultural fields - deep 2.17 micron absorption (identified as advanced argilllic, class 3, red)
48  21435017 0.149 0.149 0.149 1       No data (clouds, cloud shadow, smoke, haze, data errors)
49 103303300 0.2   0.2   0.2   1       Semi-corrupted SWIR band 5: identified advanced argillic and argillic alteration may be unreliable
50 107136639 0.247 0.247 0.247 1       Semi-corrupted SWIR band 7: identified dolomite, hydrous silica, and jarosite may be unreliable
Raster filename: aster_northwest_aa61_v2_6-11-13.img
Entity_and_Attribute_Detail_Citation: https://pubs.usgs.gov/sim/3190/
Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey - ScienceBase
Contact_Address:
Address_Type: mailing address
Address: Denver Federal Center, Building 810, Mail Stop 302
City: Denver
State_or_Province: CO
Postal_Code: 80225
Country: US
Contact_Voice_Telephone: 1-888-ASK-USGS (1-888-275-8747)
Contact_Electronic_Mail_Address: sciencebase@usgs.gov
Distribution_Liability:
Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this information product, for the most part, is in the public domain, it also contains copyrighted materials as noted in the text. Permission to reproduce copyrighted items for other than personal use must be secured from the copyright owner. This database, identified as USGS Data Release 10.5066/F7CR5RK7, has been approved for release and publication by the USGS. Although this database has been subjected to rigorous review and is substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, it is released on condition that neither the USGS nor the United States Government may be held liable for any damages resulting from its authorized or unauthorized use. Although these data have been processed successfully on a computer system at the U.S. Geological Survey, no warranty expressed or implied is made regarding the display or utility of the data on any other system, or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. The U.S. Geological Survey shall not be held liable for improper or incorrect use of the data described and/or contained herein.
Standard_Order_Process:
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Format_Name: Raster Digital Data Set
Format_Version_Number: 11.0.1
File_Decompression_Technique: no compression applied
Transfer_Size: 9.04
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: https://doi.org/10.5066/F7CR5RK7
Fees: none
Metadata_Reference_Information:
Metadata_Date: 20190128
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Peter N Schweitzer
Contact_Organization: USGS Eastern Mineral and Environmental Resources Science Center
Contact_Position: Geologist
Contact_Address:
Address_Type: mailing address
Address: 12201 Sunrise Valley Drive
City: Reston
State_or_Province: VA
Postal_Code: 20192-0002
Country: USA
Contact_Voice_Telephone: 703-648-6533
Contact_Facsimile_Telephone: 703-648-6252
Contact_Electronic_Mail_Address: pschweitzer@usgs.gov
Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998

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