Topography and Landforms of Ecuador

Metadata also available as

Metadata:


Identification_Information:

Citation:

Citation_Information:

Originator: U.S. Geological Survey

Publication_Date: 2005

Title:

Geospatial_Data_Presentation_Form: raster digital data

Series_Information:

Series_Name: U.S. Geological Survey, Data Series 136

Issue_Identification: Version #

Publication_Information:

Publisher: USGS

Online_Linkage:

Description:

Abstract:

This SRTM digital elevation model DEM was produced for landform and geomorphic modeling. The digital elevation model of Ecuador contained in this file was produced from over 40 individual tiles of elevation data from the Shuttle Radar Topography Mission (SRTM). Each tile was downloaded, converted from its native Height file format (.hgt), and imported into ArcGIS for additional processing. Processing of the data included data gap filling, mosaicking, and re-projection of the tiles to form one single seamless digital elevation model (DEM).

Purpose:

The purpose of this data set is to provide a single consistent elevation model to be used for landform and geomorphic modeling, mapping, GIS, and remote sensing applications.

Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: August, 2005

Currentness_Reference: publication date

Status:

Progress: Complete

Maintenance_and_Update_Frequency: Irregular

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -92.081403

East_Bounding_Coordinate: -88.877794

North_Bounding_Coordinate: 2.095507

South_Bounding_Coordinate: -2.114412

Keywords:

Theme:

Theme_Keyword:

REQUIRED: Common-use word or phrase used to describe the subject of the data set.

Theme_Keyword: DEM

Theme_Keyword: digital elevation model

Theme_Keyword: digital terrain model

Theme_Keyword: radar interferometry

Place:

Place_Keyword: Ecuador

Access_Constraints: None

Use_Constraints: None

Point_of_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Peter G. Chirico

Contact_Organization: U.S. Geological Survey

Contact_Position: Geographer

Contact_Address:

Address_Type: mailing and physical address

Address: 12201 Sunrise Valley Drive

Address: National Center, MS 926A

City: Reston

State_or_Province: VA

Postal_Code: 20192

Country: USA

Contact_Electronic_Mail_Address: pchirico@usgs.gov

Security_Information:

Security_Classification: Unclassified

Native_Data_Set_Environment:

Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 1; ESRI ArcCatalog 9.0.0.535


Data_Quality_Information:

Lineage:

Source_Information:

Source_Contribution:

Shuttle Radar Topography Mission elevation data augmented with elevation data developed by digitizing topographic contours from 1:50,000 scale topographic maps which date from the mid- late 1980's

Reference:

Souris M., 2001, Repùblica del Ecuador : modelo numérico del relieve, escala 1:1000000, Modèle numérique calculé à partir des cartes topographiques del I'IGM (1:50000, 1:1000000), édité et distribuée par I'IGM, Quito.

Process_Step:

Process_Description:

The digital elevation model of Ecuador represented on this map was produced from over 40 individual tiles of elevation data from the Shuttle Radar Topography Mission (SRTM). Each tile was downloaded, converted from its native Height (.hgt) file format, and imported into a geographic information system (GIS) for additional processing. Processing of the data included data gap filling, mosaicking, and re-projection of the tiles to form one single seamless digital elevation model (DEM).

For 11 days in February of 2000, NASA, the National Geospatial-Intelligence Agency (NGA), the German Aerospace Center (DLR), and the Italian Space Agency (ASI) flew X-band and C-band radar interferometry onboard the Space Shuttle Endeavor. The mission covered the Earth between 60ºN and 57ºS and will provide interferometric digital elevation models (DEMs) of approximately 80% of the Earth's land mass when processing is complete. The radar-pointing angle was approximately 55º at scene center. Ascending and descending orbital passes generated multiple interferometric data scenes for nearly all areas. Up to eight passes of data were merged to form the final processed SRTM DEMs. Elevation values recorded in coincident scenes are averaged to form a single output data scene and therefore reduces, but does not completely eliminate, the amount of area with layover and terrain shadow effects.

The most significant form of data processing for the Ecuador DEM was gap-filling areas where the SRTM data contained a data void. Void areas result from radar shadow, layover, standing water, and radar interferometry phase unwrapping errors. To fill these gaps, topographic contours were digitized from 1:50,000 scale topographic maps which date from the mid- late 1980's. Digital contours were gridded to form elevation models for void areas and subsequently merged with the SRTM data through GIS and remote sensing image-processing techniques. NoData values that were not eliminated by merging the SRTM data with the contour data were assigned a value of -99.

 

Process_Date: 7/20/2005


Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Raster

Raster_Object_Information:

Raster_Object_Type: Pixel

Row_Count: 5171

Column_Count: 3962

Vertical_Count: 1


Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Planar:

Map_Projection:

Map_Projection_Name: Transverse Mercator

Transverse_Mercator:

Scale_Factor_at_Central_Meridian: 0.999600

Longitude_of_Central_Meridian: -93.000000

Latitude_of_Projection_Origin: 0.000000

False_Easting: 500000.000000

False_Northing: 0.000000

Planar_Coordinate_Information:

Planar_Coordinate_Encoding_Method: row and column

Coordinate_Representation:

Abscissa_Resolution: 90.000000

Ordinate_Resolution: 90.000000

Planar_Distance_Units: meters

Geodetic_Model:

Horizontal_Datum_Name: D_Provisional_S_American_1956

Ellipsoid_Name: International_1924

Semi-major_Axis: 6378388.000000

Denominator_of_Flattening_Ratio: 297.000000


Distribution_Information:

Distributor:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: U.S. Geological Survey

Contact_Address:

Address_Type: mailing and physical address

Address: 12201 Sunrise Valley Drive

Address: National Center, MS 926A

City: Reston

State_or_Province: VA

Postal_Code: 20192

Country: USA

Resource_Description: Downloadable Data

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Transfer_Size: 39.117

Digital_Transfer_Option:

Offline_Option:

Offline_Media: DVD


Metadata_Reference_Information:

Metadata_Date: 20050810

Metadata_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Peter G. Chirico

Contact_Organization: U.S. Geological Survey

Contact_Position: Geographer

Contact_Address:

Address_Type: mailing and physical address

Address: 12201 Sunrise Valley Drive

Address: National Center, MS 926A

City: Reston

State_or_Province: VA

Postal_Code: 20192

Country: USA

Contact_Electronic_Mail_Address: pchirico@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


Generated by mp version 2.8.6 on Wed Aug 10 09:51:42 2005