Vegetation and built -up area transformation on coastal area as capital city: case study of Makassar city, Sulawesi Island, Indonesia

摘要

Makassar City's population has been reaching 2.03% annually. Based on that data, it can be assumed that the extend of buildings also increasing along with the growth of population. The objective of this study are to distinguish difference of NDVI and NDBI in Makassar City in year 1998 and 2018, using Landsat-5 and Landsat-8 OLI imageries, and also to compare 2018 processed imagery, both NDVI and NDBI actual condition. This Study was used moderated spatial resolution Landsat in 1998 to 2018. Field study was conducted on Makassar city, Sulawesi island. The normalized difference built-up index and normalized difference Vegetation Index were used for mapping urban built-up areas and vegetation area. The methods for extraction of built-up and vegetation areas using Landsat imagery comprised four major steps: preprocessing and examination of satellite data, image enhancement through resolution merging, development of vegetation and built-up area extraction method, and accuracy assessment. The analysis of NDVI and NDBI in Makassar city showed the qualitative information about the vegetation and built-up area for 20 years (1998 to 2018). The time series of the annual averages of NDVI and NDBI values showed a decrease in vegetation rates and an increase in built-up areas.