Abstract
Gumuk Pasir Parangtritis is one of the potentials of the coastal area of Parangtritis village in Yogyakarta, with several important roles for the coastal ecosystem and its surroundings, such as ecology, disaster, tourism, economy, and aquifer reserves. However, behind this important role, the existence of sandbanks is increasingly threatened from year to year because the area of sand cover continues to decline, especially in the core zone. Therefore, regular and effective mapping and monitoring efforts are needed. This study aims to a) conduct land cover mapping using the Geographic Object Based Image Analysis (GEOBIA) method in the 2015-2019 timeframe; b) analyze changes in land cover in the core zone of sandbanks during 2015-2019; and c) evaluate the results of restoration of sand dune core zone in terms of land cover changes that have occurred until 2019. Small format aerial photographs (FUFK) are the data used in this study while the mapping method used is rule-based classification. The land cover of the sand dune core zone in 2015 included buildings, vegetation, sand, roads and ponds, while in 2019 it was in the form of buildings, vegetation, sand, and roads. Based on the classification results in the two years, it can be seen that there are changes in land cover (including area) through the cross-section of the two classification results. Some of the factors include the number of land use changes, the amount of vegetation, and sand mining. Furthermore, this change can be used as a basis for evaluating the success of the restoration efforts of the Gumuk Pasir Parangtritis core zone to date. The results of the evaluation show that the restoration carried out so far has not had much impact so it can be said that it has not been successful, because the area of sand cover has actually decreased a lot (from 528,680 m2 to 344,347 m2), while the land cover in the form of vegetation and buildings has increased in size (from 869,341 m2 to 1,037,879 m2 for vegetation cover and an area of 4,674 m2 to 22,953 m2 for buildings).
Highlights
Gumuk Pasir Parangtritis is one of the natural potentials possessed by the coastal area of Parangtritis village of Yogyakarta, with various roles
This study aims to; a) conduct land cover mapping using the Geographic Object Based Image Analysis (GEOBIA) method, within the 2015-2019 timeframe; b) analyze changes in land cover in the core zone of sandbanks within the same timeframe; and c) evaluating the results of restoration of the sand dune core zone in terms of land cover changes that have occurred until 2019
Qualitative changes in land cover in the Gumuk Pasir Parangtritis core zone can be identified by visual observation or by overlaying the results of the land cover classification for the two years
Summary
Gumuk Pasir Parangtritis is one of the natural potentials possessed by the coastal area of Parangtritis village of Yogyakarta, with various roles. These roles include as a habitat for flora and fauna in coastal ecosystems and a tsunami barrier (Khotimah, 2006). Et al, (2010) called this area uniquely natural This is due to the presence of a barchan sand dune. Over time, with the emergence of various activities in the Gumuk Pasir Parangtritis area, the condition has become increasingly concerned, as indicated by the decline in the area of sand dunes from year to year. Over time, with the emergence of various activities in the Gumuk Pasir Parangtritis area, the condition has become increasingly concerned, as indicated by the decline in the area of sand dunes from year to year. based on literature on aerial photography data in 1972, 1992, 2002, 2006, and 2015 (Fakhruddin, et al, 2010); (Maulana & Wulan, 2015)
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