Landslides triggered by Hurricane Mitch in El Salvador

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Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: Anthony J. Crone
Originator: Rex L. Baum
Originator: David J. Lidke
Originator: Damon N.D. Sather
Originator: Lee-Ann Bradley
Originator: Arthur C. Tarr
Publication_Date: 2001
Title: Landslides triggered by Hurricane Mitch in El Salvador
Geospatial_Data_Presentation_Form: vector digital data
Series_Information:
Series_Name: U.S. Geological Survey Open-File Report
Issue_Identification: 01-444
Publication_Information:
Publication_Place: Denver, CO
Publisher: U.S. Geological Survey
Online_Linkage: http://pubs.usgs.gov/of/2001/ofr-01-0444/
Larger_Work_Citation:
Citation_Information:
Originator: Anthony J. Crone
Originator: Rex L. Baum
Originator: David J. Lidke
Originator: Damon N.D. Sather
Originator: Lee-Ann Bradley
Originator: Arthur C. Tarr
Publication_Date: 2001
Title:
Landslides Induced by Hurricane Mitch in El Salvador--An Inventory and Descriptions of Selected Features
Geospatial_Data_Presentation_Form: map
Series_Information:
Series_Name: U.S. Geological Survey Open-File Report
Issue_Identification: 01-444
Publication_Information:
Publication_Place: Denver, CO
Publisher: U.S. Geological Survey
Online_Linkage: http://pubs.usgs.gov/of/2001/ofr-01-0444/
Description:
Abstract:
This cover contains the outlines of landslides and debris flows caused by heavy rainfall associated with Hurricane Mitch in October-November 1998. The landslides and debris flows shown in this coverage were mapped using 1:40,00-scale and 1:15,000-scale black-and-white aerial photographs. Much of the photography was taken a few months after the storm, but additional photography was taken in late 2000. The photographs were visually examined using 4-X mirror stereoscopes, and the landslides were plotted by hand on mylar overlays that were registered to topographic maps. The landslides were plotted on 1:25,000-scale maps where these high-quality maps were available; for other parts of the country, the landslides were plotted on 1:50,000-scale maps. The plotted landslides were then manually digitized and registered to digital raster graphic (DRG) images of 1:50,000-scale topographic maps. Some of the areas in this coverage are composites of parts of two or more 12:50,000-scale quadrangles. To produce these composites, the edges of adjoining quadrangles had to be digitally adjusted in ArcInfo to assure continuity between adjacent maps. These adjustments were also necessary to resolve differences in the resolution between 1:50,000-scale and 1:25,000-scale topographic maps. After these adjustments, the areas of each plate were cut from merged DRGs and the digital landslides were then plotted on the DRG images of the map areas. The cover portrays the shapes, relative location, and size of landslides and the associated downslope channel deposits caused by the hurricane. For those features that were originally mapped on 1:25,000-scale topographic maps, we estimate that their locations are accurate to within less than 100 m and probably to within 50m. For features that were originally mapped on 1:50,000-scale topographic maps, their locations are probably accurate to within 100-200m.
Purpose:
The coverage shows the distribution of slope failures and the associated deposits caused by Hurricane Mitch in El Salvador. The cover included maps of these features in widely separated parts of the country. The maps provide an inventory of these features and also contain a few recent landslides that predate the hurricane. When data from this inventory is combined with geotechnical data on the physical properties of material on hill slopes, the hillslope form, and rainfall intensity and duration information, this coverage can be used as a basis for evaluating landslide susceptibility in similar areas of the country.
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 200112
Currentness_Reference: publication date
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -89.970306
East_Bounding_Coordinate: -87.981537
North_Bounding_Coordinate: 14.401690
South_Bounding_Coordinate: 13.351671
Keywords:
Theme:
Theme_Keyword_Thesaurus: USGS Thesaurus
Theme_Keyword: landslides
Theme_Keyword: hurricanes
Theme_Keyword: precipitation (atmospheric)
Theme_Keyword: geospatial datasets
Theme:
Theme_Keyword_Thesaurus: none
Theme_Keyword: landslides
Theme_Keyword: Hurricane Mitch
Theme_Keyword: debris flows
Theme_Keyword: earth flows
Theme_Keyword: inventory
Theme_Keyword: rainfall
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Categories
Theme_Keyword: geoscientificInformation
Place:
Place_Keyword_Thesaurus: none
Place_Keyword: El Salvador
Place_Keyword: San Ignacio
Place_Keyword: Tejutla
Place_Keyword: Santa Ana
Place_Keyword: Ahuachapan
Place_Keyword: Berlin
Place_Keyword: San Miguel
Place_Keyword: Embalse Cerron Grande
Place_Keyword: Embalse 15 de Septiembre
Place:
Place_Keyword_Thesaurus: Augmented FIPS 10-4 and FIPS 6-4
Place_Keyword: ES = El Salvador
Access_Constraints: none
Use_Constraints: none
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Anthony J Crone
Contact_Organization: U.S. Geological Survey, CR
Contact_Address:
Address_Type: mailing address
Address:
Mail Stop 966
P.O. Box 25046
City: Lakewood
State_or_Province: CO
Postal_Code: 80225
Country: USA
Contact_Voice_Telephone: 303-273-8591
Contact_Facsimile_Telephone: 303-273-8600
Contact_Electronic_Mail_Address: crone@usgs.gov
Browse_Graphic:
Browse_Graphic_File_Name: Browse_Graphic_File_Description:
Map showing study areas and aerial photograph coverage, 585x439 pixels, 16k bytes.
Browse_Graphic_File_Type: PNG
Native_Data_Set_Environment:
Microsoft Windows NT Version 4.0 (Build 1381) Service Pack 6; ESRI ArcCatalog 8.1.1.649
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
Attribute accuracy was assured by visually comparing compilation copy with plotted map in which the landslide styles were color coded.
Logical_Consistency_Report:
Registration accuracy was checked by inspecting plots of the data and graticule overlaid on a Digital Raster Graphic (DRG) of the base map. Topological consistency was checked by assuring that all data polygons had one label point.
Completeness_Report:
Completeness was assured by visually inspecting the compilation map overlaid on the plotted map looking for missing polygons.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
For those landslides that were originally mapped on 1:25,000-scale topographic maps, we estimate that their locations are accurate to within less than 100 m and probably to within 50m. For features that were originally mapped on 1:50,000-scale topographic maps, their locations are probably accurate to within 100-200m.
Lineage:
Source_Information:
Source_Scale_Denominator: 15000 and 40000
Type_of_Source_Media: aerial photographs
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 199812
Ending_Date: 200012
Source_Currentness_Reference: ground condition
Process_Step:
Process_Description:
Aerial photographs taken between December 1998 and December 2000. Some photographs were part of a cooperative program between the Japanese International Cooperative Agency (JICA) and the Government of El Salvador and are available the the Salvadoran National Geographic Institute (IGN). Other photographs were acquired by the USGS under contract and are archive at the USGS's Eros Data Center, Sioux Falls, South Dakota. Digital Raster Graphics (DRG) scanned images of 1:50,000-scale quadrangles projected to Transverse Mercator were used as base maps for the mapping. We mapped the cloud cover by first locating it on the aerial photographs using a mirror stereoscope and then manually plotting by inspection a polygon that best represented the shape and size of the landslides onto the base maps. Many of base maps were at a scale of 1:25,000-scale; for some areas, only 1:50,000-scale base maps were available. The mapped areal extent of the landslides were digitized, and then digitally registered to the DRG base maps. Final maps are presented at 1:50,000 scale.
Process_Date: 10/2001
Process_Step:
Process_Description: Creation of original metadata record
Process_Date: 20020117
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Anthony J Crone
Contact_Organization: U.S. Geological Survey, CR
Contact_Address:
Address_Type: mailing address
Address:
Mail Stop 966
P.O. Box 25046
City: Lakewood
State_or_Province: CO
Postal_Code: 80225
Country: USA
Contact_Voice_Telephone: 303-273-8591
Contact_Facsimile_Telephone: 303-273-8600
Contact_Electronic_Mail_Address: crone@usgs.gov
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Vector
Point_and_Vector_Object_Information:
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: Complete chain
Point_and_Vector_Object_Count: 725
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: Label point
Point_and_Vector_Object_Count: 623
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains
Point_and_Vector_Object_Count: 621
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: Point
Point_and_Vector_Object_Count: 176
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Geographic:
Geographic_Coordinate_Units: Decimal degrees
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1927
Ellipsoid_Name: Clarke 1866
Semi-major_Axis: 6378206.4
Denominator_of_Flattening_Ratio: 294.978698
Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: Landslide
Entity_Type_Definition: polygon in elsmitchlsdd.pat
Attribute:
Attribute_Label: LS
Attribute_Definition: relation of landslide polygon to Hurricane mitch
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 0
Enumerated_Domain_Value_Definition:
Area not a landslide (may be unaffected region within a landslide)
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 1
Enumerated_Domain_Value_Definition: Landslide triggered by Hurricane Mitch
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 9
Enumerated_Domain_Value_Definition:
Landslide that is believed to have been triggered by Hurricane Mitch but was not field-checked.
Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: USGS Information Services
Contact_Address:
Address_Type: mailing address
Address: Box 25286 Denver Federal Center
City: Denver
State_or_Province: CO
Postal_Code: 80225
Country: USA
Contact_Voice_Telephone: 1-888-ASK-USGS
Contact_Facsimile_Telephone: 303-202-4693
Contact_Electronic_Mail_Address: ask@usgs.gov
Resource_Description: USGS Open-File Report 01-444
Distribution_Liability:
This report is preliminary and has not been reviewed for conformity with U.S.Geological Survey editorial standards nor with the North American Stratigraphic Code.Any use of trade names in this publication 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: ARCE
Format_Version_Number: 8.1
Format_Information_Content: Landslide extents
Transfer_Size: 0.7
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Fees: none
Metadata_Reference_Information:
Metadata_Date: 20150204
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Peter N Schweitzer
Contact_Organization: USGS Midwest Area
Contact_Position:
Collection manager, USGS Geoscience Data Clearinghouse, http://geo-nsdi.er.usgs.gov/
Contact_Address:
Address_Type: mailing address
Address:
Mail Stop 954
12201 Sunrise Valley Dr
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: Content Standard for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998

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