|
Digital Shaded-Relief Map of Venezuela Entry ID: USGS_OFR_2004_1322 |
||||||||
|
[
Update this Record
]
|
Summary
|
Abstract:
The Digital Shaded-Relief Map of Venezuela is a composite of more than 20 tiles of 90 meter (3 arc second) pixel resolution elevation data, captured during the Shuttle Radar Topography Mission (SRTM) in February 2000. The SRTM, a joint project between the National Geospatial-Intelligence Agency (NGA) and the National Aeronautics and Space Administration (NASA), provides the most accurate and comprehensive international digital elevation dataset ever assembled. The 10-day flight mission aboard the U.S. Space Shuttle Endeavour obtained elevation data for about 80% of the world's landmass at 3-5 meter pixel resolution through the use of synthetic aperture radar (SAR) technology. SAR is desirable because it acquires data along continuous swaths, maintaining data consistency across large areas, independent of cloud cover. Swaths were captured at an altitude of 230 km, and are approximately 225 km wide with varying lengths. Rendering of the shaded-relief image required editing of the raw elevation data to remove numerous holes and anomalously high and low values inherent in the dataset. Customized ArcInfo Arc Macro Language (AML) scripts were written to interpolate areas of null values and generalize irregular elevation spikes and wells. Coastlines and major water bodies used as a clipping mask were extracted from 1:500,000-scale geologic maps of Venezuela (Bellizzia and others, 1976). The shaded-relief image was rendered with an illumination azimuth of 315� and an altitude of 65�. A vertical exaggeration of 2X was applied to the image to enhance land-surface features. Image post-processing techniques were accomplished using conventional desktop imaging software. [Summary provided by the USGS.] |
Related URL
|
Link:
GET RELATED DATA SET METADATA (DIF)
Description: Shuttle Radar Topography Mission Images. Link: VIEW EXTENDED METADATA Description: FGDC metadata on the Digital Shaded-Relief Map of Venezuela. Link: VIEW PROJECT HOME PAGE Description: Shuttle Topography Radar Mission Homepage |
Parent DIF
|
This data set description is a member of a collection. The collection is described in JPL_SRTM |
Geographic Coverage
| N: 12.213118 | S: 0.598294 | E: -59.75341 | W: -73.41939 |
|
Data Set Citation
|
Dataset Originator/Creator:
Christopher P. Garrity, Paul C. Hackley, and Franco Urbani, U.S. Geological Survey
Dataset Title: Digital Shaded-Relief Map of Venezuela Dataset Series Name: U.S. Geological Survey Open-File Report Dataset Release Date: 2004 Dataset Release Place: U.S. Dataset Publisher: U.S. Geological Survey Version: 1.0 Data Presentation Form: remote sensing image Online Resource: http://pubs.usgs.gov/of/2004/1322/ |
Location Keywords
|
CONTINENT
> SOUTH AMERICA
> VENEZUELA
|
Science Keywords
| LAND SURFACE >LAND USE/LAND COVER [Definition] |
| LAND SURFACE >LANDSCAPE >LANDSCAPE PATTERNS [Definition] |
| LAND SURFACE >TOPOGRAPHY >LANDFORMS [Definition] |
| LAND SURFACE >TOPOGRAPHY >SURFACE ROUGHNESS [Definition] |
| LAND SURFACE >TOPOGRAPHY >TERRAIN ELEVATION [Definition] |
| LAND SURFACE >TOPOGRAPHY >TOPOGRAPHIC EFFECTS [Definition] |
| SPECTRAL/ENGINEERING >RADAR >RADAR IMAGERY [Definition] |
ISO Topic Category
|
ELEVATION
GEOSCIENTIFIC INFORMATION IMAGERY/BASE MAPS/EARTH COVER PLANNING CADASTRE |
Platform
| DEM >Digital Elevation Model [Information] |
| SPACE SHUTTLES [Information] |
Instrument
| SRTM >Shuttle Radar Topography Mission [Information] |
Project
| SRTM >Shuttle Radar Topography Mission [Information] |
Quality
|
The mission objective is to produce digital topographic map products with <= 20 m absolute horizontal circular accuracy. All accuracies are quoted at the 90% level, consistent with National Map Accuracy Standards. |
Access Constraints
| None |
Use Constraints
|
Acknowledgement of the originating agencies would be appreciated in products derived from these data. |
Keywords
| Shaded Relief |
| Relief |
| Topography |
| 3-arc-sec DEM |
| geoTIFF |
| GIS |
| Geographic Information Systems |
| SRTM |
| Shuttle Radar Topography Mission |
Data Set Progress
| COMPLETE |
Originating Center
| USGS |
Data Center
|
Open File Services Section, Publications Warehouse, Eastern Region, Publications, U.S. Geological Survey, U.S. Department of the Interior
[Information]
Data Center URL: http://pubs.usgs.gov/of/
| |||
Distribution
|
Distribution_Media:
Online
Distribution_Size: 79 MB compressed; 214 MB uncompressed Distribution_Format: geoTIFF Fees: No fees |
Personnel
|
CHRISTOPHER
GARRITY Role: DIF AUTHOR Role: TECHNICAL CONTACT Phone: 703-648-6426 Fax: 703-648-6419 Email: cgarrity at usgs.gov Contact Address: 12201 Sunrise Valley Drive, MS 956 City: Reston Province or State: VA Postal Code: 20172 Country: USA |
Creation and Review Dates
DIF Creation Date:
2004-11-02
Last DIF Revision Date:
2011-07-01
| [ Update this Record ] |
