Accession Number : AD1037457


Title :   Subjective Mapping of Dust-Emission Sources by Using MODIS Imagery


Descriptive Note : Technical Report


Corporate Author : U.S. Army Engineer Research and Development Center (ERDC) Hanover


Personal Author(s) : Sinclair,Samantha N ; Jones,Sandra L


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/1037457.pdf


Report Date : 01 May 2017


Pagination or Media Count : 61


Abstract : Dust storms (5 to 100 km across) often originate from multiple dust-emission sources (1 to 10 km across). Remote-sensing-based dust-source identification is a challenge. A previous study developed a subjective approach for mapping dust sources by using enhanced MODIS satellite imagery; therefore, this study conducted mapping exercises to assess the reproducibility of this technique amongst multiple analysts and in different regions. Multiple staff members independently analyzed satellite imagery for mappable dust sources for Southwest Asia and the Southwest United States. Mapped points were considered reproducible if the location of dust emission plumes identified by all participants could be constrained to a 10 km buffer. Using this definition, point-source locations were 28% reproducible in Southwest Asia and 85% reproducible in the Southwest United States. Increasing the allotted buffer to 15 km, however, improved results to 71% and 100%, respectively. Mapped dust sources for Southwest Asia were compared to geomorphic landform maps. At the 1:750,000 map scale, points mapped by all analysts for a single dust plume tended to overlay one landform, while at the 1:100,000 map scale, points were strewn across several landforms. Results suggest that the methodology is reproducible for certain applications but that location-uncertainty tolerance affects perceived conclusions.


Descriptors :   satellite imaging , dust storms , topography , reproducibility , remote sensing , detection , landforms


Subject Categories : Meteorology


Distribution Statement : APPROVED FOR PUBLIC RELEASE