Accession Number : ADA317349

Title :   An Assessment of the Horizontal Accuracy of Interim Trrain Data.

Descriptive Note : Technical rept. Jun 94-Oct 95,

Corporate Author : ARMY TOPOGRAPHIC ENGINEERING CENTER ALEXANDRIA VA

Personal Author(s) : Fatale, Louis ; Messmore, Jeffrey ; Ackeret, James

PDF Url : ADA317349

Report Date : APR 1996

Pagination or Media Count : 33

Abstract : Within the U.S. Army and throughout the private sector, the accuracy of Digital Topographic Data (DTD) is often taken for granted. Users assume terrain data to be accurate merely because of its digital nature. This report describes a study that was undertaken to determine the horizontal accuracy of Interim Terrain Data (ITD), a 1:50,000-scale terrain analysis data base. ITD is composed of vector features and associated attributes representing land cover characteristics. It is produced by the Defense Mapping Agency (DMA) and provided to the U.S. Army to support near-term requirements on an interim basis until more standardized data is available. Because of its interim nature, ITD may be digitized from hard copy source ('carto-controlled') or produced solely from photography ('photo-controlled'). No definitive accuracy statement is provided with the data. This study was initiated in 1994 with the collection of ground coordinates for over 400 selected ITD features. Each feature was located in the field using a Precise Lightweight Global Positioning System Receiver (PLGR) in the Precise Positioning Service (PPS) mode ( 10-meter horizontal accuracy). Universal Transverse Mercator (UTM) coordinates obtained from the PLGR were annotated for each feature.

Descriptors :   *GLOBAL POSITIONING SYSTEM, *GEOGRAPHICAL INFORMATION SYSTEMS, DATA BASES, DATA MANAGEMENT, ACCURACY, TERRAIN, COORDINATES, MAPPING, TOPOGRAPHIC MAPS, DIGITAL MAPS, GEODESICS.

Subject Categories : Cartography and Aerial Photography
      Geography

Distribution Statement : APPROVED FOR PUBLIC RELEASE