# Cloud computing using Google Earth Engine and Sentinel-1 SAR images to detect water bodies changes at coastal city
> Selamat M.B.

URL kanonis: https://discover.unhas.ac.id/publications/pub_scopus_85212401239
Jurnal / Konferensi: Iop Conference Series Earth and Environmental Science
Tahun terbit: 2024
DOI: https://doi.org/10.1088/1755-1315/1410/1/012038
ISSN: 17551307
Citations: 0

## Authors
- Selamat M.B.

## Abstract
Abstract Flooding in low-lying urban coastal areas often occurs during extreme rainfall periods. Although such floods are temporary, they can cause devastating damage and disrupt transportation and economic activities. As a coastal city, Makassar is faced with extreme tidal phenomena as a result of climate change, which contribute to flooding events under certain conditions. This study aims to spatially detect inundations during the rainy season at Makassar City in 2018, 2019, 2020, 2021 and 2022. A number of Sentinel-1 images that work on microwaves and are available on the Google Earth Engine have been deployed and processed using Cloud Computing Technology. Water bodies and land were distinguished by backscattering values of VV polarization using the Threshold and Boolean techniques. Water body images were converted from raster to vector, and polygon areas were calculated. The largest body of water occurred during the 2021 wet season, at approximately 1,389 ha, and the lowest at approximately 986 ha (1,653 points) in 2022. Over the five years from 2018 to 2022, Manggala, Tamalanrea, Tamalate and Biringkanaya districts had the largest water bodies during the wet season. During this period, the area of water bodies varied between 6% and 8% of Makassar’s total area, with a decreasing trend of approximately 1%.

## Keywords
- Flooding (psychology)
- Wet season
- Raster graphics
- Cloud computing
- Flood myth
- Environmental science
- Meteorology
- Geography
- Physical geography
- Hydrology (agriculture)
- Cartography
- Geology
- Psychology
- Geotechnical engineering
- Artificial intelligence
- Operating system
- Psychotherapist
- Archaeology
- Computer science

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Sumber: Discover Unhas — RIMS Universitas Hasanuddin.
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