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: Older landslides (before 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 selected landslides and debris flows that occurred prior to Hurricane Mitch in the areas where hurricane-induced landslides were mapped. 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 pre-hurricane landslides and the associated downslope deposits. 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 pre-hurricane slope failures and the associated deposits selected parts of 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. 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: -88.858421 East_Bounding_Coordinate: -88.527321 North_Bounding_Coordinate: 14.066360 South_Bounding_Coordinate: 13.560819 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_Keyword: pre-Hurricane Mitch 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: No access constraints Use_Constraints: No user constraints 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: http://geo-nsdi.er.usgs.gov/metadata/open-file/01-444/01-444.png 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: 200110 Process_Step: Process_Description: Creation of original metadata record Process_Date: 20020118 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: 15 SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: Label point Point_and_Vector_Object_Count: 12 SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains Point_and_Vector_Object_Count: 12 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: polygons described in elspremitch.pat Attribute: Attribute_Label: OL 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 that occurred prior to Hurricane Mitch Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: 9 Enumerated_Domain_Value_Definition: Landslide that is believed to have occurred prior to 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: 0.05 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://pubs.usgs.gov/of/2001/ofr-01-0444/EXPORT/elspremitch.e00 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