Identification_Information: Citation: Citation_Information: Originator: U.S. Geological Survey Publication_Date: 2002 Publication_Time: Unknown Title: elscloud Geospatial_Data_Presentation_Form: vector digital data Series_Information: Series_Name: U.S. Geological Survey Open-File Report Issue_Identification: 01-0444 Publication_Information: Publisher: U.S. Geological Survey Online_Linkage: http://mitchntsl.cr.usgs.gov Larger_Work_Citation: Citation_Information: Publication_Date: 2002 Title: Landslides Induced by Hurricane Mitch in El Salvador--An Inventory and Descriptions of Selected Features Geospatial_Data_Presentation_Form: map Description: Abstract: This coverage includes the areas obscured by clouds on the aerial photographs that were used to map landslides in widely separated areas throughout El Salvador following Hurricane Mitch. Purpose: The passage of Hurricane Mitch through Central America in October and November 1998 caused widespread and devastating flooding and landsliding. In this data set we show the areas covered by clouds that might have obscured landslides on aerial photographs taken following Hurricane Mitch in El Salvador. Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 12/2001 Currentness_Reference: publication date Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -89.735535 East_Bounding_Coordinate: -89.040504 North_Bounding_Coordinate: 14.445621 South_Bounding_Coordinate: 13.856537 Keywords: Theme: Theme_Keyword: landslides Theme_Keyword: Hurricane Mitch Theme_Keyword: debris flows Theme_Keyword: earth flows Theme_Keyword: inventory Theme_Keyword: rainfall Theme_Keyword: cloud cover Place: 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 Temporal: Temporal_Keyword: October 1998 Temporal_Keyword: November 1998 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 Contact_Position: Geologist Contact_Address: Address_Type: mailing address Address: U.S. Geological Survey, MS 966, Box 25046 City: Denver State_or_Province: CO Postal_Code: 80225-0046 Country: USA Contact_Voice_Telephone: 303 273-8591 Contact_Facsimile_Telephone: 303 273-8600 Contact_Electronic_Mail_Address: crone@usgs.gov Hours_of_Service: 08:00-14:30 Mountain Time Contact_Instructions: Physical Address: 1711 Illinois St., Golden, CO 80403 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 cloud cover was mapped. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: The scale of the aerial photographs and the method of manually transferring the extent of the cloud cover on the photographs yields an estimated accuracy of about 200 m for the clouds. Lineage: Source_Information: Source_Scale_Denominator: 1:15,000 and 1:40,000 Type_of_Source_Media: black and white aerial photographs Source_Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 12/1998 Ending_Date: 12/2000 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 archived 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 to produce a polygon that best represented the shape and size of clouds 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 cloud cover was digitized, and then digitally registered to the DRG base maps. Final maps are presented at 1:50,000 scale. Process_Date: 10/2001 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: 17 SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: Label point Point_and_Vector_Object_Count: 14 SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains Point_and_Vector_Object_Count: 14 SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: Point Point_and_Vector_Object_Count: 176 SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: Label point Point_and_Vector_Object_Count: 0 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Geographic: Latitude_Resolution: 0.000000 Longitude_Resolution: 0.000000 Geographic_Coordinate_Units: Decimal degrees Geodetic_Model: Horizontal_Datum_Name: North American Datum of 1927 Ellipsoid_Name: Clarke 1866 Semi-major_Axis: 6378206.400000 Denominator_of_Flattening_Ratio: 294.978698 Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: elscloud.pat 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_Definition: Area of feature in internal units squared. Attribute_Definition_Source: ESRI Attribute_Domain_Values: Unrepresentable_Domain: Positive real numbers that are automatically generated. Attribute: Attribute_Label: PERIMETER Attribute_Definition: Perimeter of feature in internal units. Attribute_Definition_Source: ESRI Attribute_Domain_Values: Unrepresentable_Domain: Positive real numbers that are automatically generated. Attribute: Attribute_Label: ELSCLOUD# 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: ELSCLOUD-ID Attribute_Definition: User-defined feature number. Attribute_Definition_Source: ESRI Attribute: Attribute_Label: CL Attribute_Definition: 1 = cloud; 0 = no cloud Distribution_Information: Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Transfer_Size: 0.032 Metadata_Reference_Information: Metadata_Date: 20020117 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Anthony J. Crone Contact_Organization: U.S. Geological Survey Contact_Position: Geologist Contact_Address: Contact_Voice_Telephone: 303 273-8591 Contact_Facsimile_Telephone: 303 273-8600 Contact_Electronic_Mail_Address: crone@usgs.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