An Assessment of the Horizontal Accuracy of Interim Trrain Data.
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1996
- Accession Number
- ADA317349
Entities
People
- James Ackeret
- Jeffrey Messmore
- Louis Fatale