Naslov
Crater detection from Earth digital topography: first results for ACE2 dataset.

Autori
Salamunićcar, Goran ; Lončarić, Sven

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
39th COSPAR Scientific Assembly / - Mysore, 2012

Skup
39th COSPAR Scientific Assembly

Mjesto i datum
Mysore, Indija, 14.07.2012. - 21.07.2012

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Crater Detection Algorithms

Sažetak
Large impact event about 65 million of years ago redirected biological evolution on Earth by producing the major extinction – the point at which dinosaurs died and mammals became major players in the history of terrestrial life, while the multiple impacts of Comet Shoemaker-Levy 9 on Jupiter in July 1994 provided an additional example of what might happen if a similar object struck Earth instead [B. M. French, 1998, Traces of Catastrophe]. According to the Earth Impact Database, there are 178 confirmed impact craters on Earth (EA178 catalogue). Estimates of yet-to-find impact crater population on Earth depend on catalogues of impact craters of other planetary bodies, such as Mars, Venus and the Moon, wherein considerably more craters are preserved up to the present date [S. A. Stewart, 2011, Journal of the Geological Society 168 (1), 1-13]. Scientific investigation of all these processes is important for prediction of possible future impacts on Earth and consequential natural hazards. In our previous work, we developed a crater detection algorithm (CDA) for crater detection from digital topography data using gradient value/orientation, morphometry, votes-analysis, slip-tuning and calibration [G. Salamunićcar and S. Lončarić, 2010, IEEE Transactions on Geoscience and Remote Sensing 48 (5), 2317-2329] and further improved it using a crater shape-based interpolation [G. Salamunićcar, S. Lončarić and E. Mazarico, 2012, Planetary and Space Science 60 (1), 236-247]. During the work on some of the currently most complete catalogues of Mars (MA132843GT with 132843 craters) and the Moon (LU60645GT with 60645 craters), we used CDA to identify numerous previously uncatalogued craters and extended the catalogues with them. In this work, we are using our CDA in combination with Earth digital elevation map (DEM) dataset ACE2 (Altimeter Corrected Elevations) in horizontal resolution of 30 minutes (1/120°) upsampled into 1/128°, in order to evaluate the possibility of potential search for still unknown impact structures on Earth. Out of 178 known impact craters (EA178), our CDA successfully detected 24 of them (other non detected craters are mostly too eroded or too small for available resolution). This confirms that our CDA can be used successfully for detection of Earth impact craters as well. The plan for our future work is to use DEM datasets in much higher horizontal resolution (e.g. ACE2 available in horizontal resolution of 3 minutes – 1/1200°), in order to search for still unknown impact craters on Earth.

Izvorni jezik
Engleski

Znanstvena područja
Geologija, Računarstvo

POVEZANOST RADA