Analysis of Vegetation Density Using Landsat 8 Imagery for Mapping Characteristics of Green Open Space in Denpasar City I Ketut Putrajaya 1 , I Putu Hendra Mas Martayana 2 {ketut.putrajaya@undiksha.ac.id 1 , mas.mertayana@undiksha.ac.id 2 } Universitas Pendidikan Ganesha, Indonesia 12 Abstract. The development of an urban area has led to changes in land use which have an impact on the existence of green open spaces as one of the city's ecosystems to be less attention. Observation of green open space conditions by utilizing remote sensing technology is an important thing to do so that optimal development planning strategies can be carried out. This study aims to analyze the relationship between vegetation index values with vegetation density and to analyze the distribution characteristics of green open spaces in Denpasar City. The vegetation index transformation used is the Normalized Difference Vegetation Index (NDVI) and the Soil Adjusted Vegetation Index (SAVI). Linear regression analysis is used to determine the relationship between the vegetation index and vegetation density as a consideration in determining the availability of green open space. The results showed that the NDVI transformation produced a better correlation value (R 2 ) of 0.842 compared to SAVI of 0.826. The results of the accuracy test of vegetation density mapping showed a level of accuracy of 90% and it was obtained that the green open space area reached 4,872.34 Ha or 38.92% of the area of Denpasar City. If this condition does not find a solution, it is feared that the availability of green open space will continue to decrease, so this research is important to do in order to provide information on existing green open spaces. Keywords: Vegetation Index; Landsat 8; Green Open Space 1. Introduction Urban areas are places for the development of social, cultural and economic activities in which there is a concentration of a number of people as actors of activities. The development of an urban area is marked by the development of the human population which is accompanied by physical facilities and infrastructure such as housing, transportation, industry, etc. which functions as a support for the activities of the population in the city which also experience development (Santillan, et al, 2019). The development of an urban area has led to changes in land use which have an impact on the existence of green open space as one of the city ecosystems to be less attention, although the existence of green open space is expected to overcome environmental problems in urban areas. In the early stages of urban development, most of the land was green open space. However, with the increasing need for space and land to accommodate residents and their activities, these green open spaces tend to undergo land use conversion into built-up areas. The increase in land needs can be viewed from two main phenomena in urban areas, namely the expansion of built-up areas in non-built areas ICLSSE 2020, November 10, Singaraja, Indonesia Copyright © 2021 EAI DOI 10.4108/eai.10-11-2020.2303425