Authors : I. Putu Sriartha, I. Nyoman Jampel, I. Wayan Widiana and I. Ketut Putrajaya
Abstract: Green Open Space (GOS) in Denpasar City is getting narrower in proportion to the increase in the need for built-up area. This study was aimed to study the accuracy of the ability of ALOS AVNIR-2 image technology with geographical information system in extracting vegetation density and land use for mapping GOS and estimating oxygen availability; determining GOS need based on oxygen need; determining the location priority of GOS based on vegetation density and land use. ALOS AVNIR-2 image technology became the main source of data in extracting green cover and land use. Oxygen need was calculated by using Gerrarkis method based on the number of population, vehicles industries and hotels from satellite image interpretation. Neighborhood priority was determined by overlaying step-by-step quantitative approach based on the variables of distance to the main road, rate of green cover, air pollution level and GOS need. The result showed that NDVI transformation produced a better correlation coefficient (R2, that is, 0. 8371 compared to SAVI (0.8368). The interpretation of the cover and land use produced the precision value of 91% and the GOS of 38. 96% from the area of Denpasar city. Estimation of oxygen availability is 945.852.19 kg/day while the oxygen need of the population, motor vehicles industries and hotels is 1.483.561, 66 kg/day, thus, they need an additional amount of oxygen of 537. 709,47 kg/day which is produced by GOS with the area of 1.062.06 ha. The priority areas of the GOS location spread is composed of 5 villages in North Denpasar District, 4 villages in East Denpasar District, 4 villages in South Denpasar District and 6 villages in West Denpasar.
I. Putu Sriartha, I. Nyoman Jampel, I. Wayan Widiana and I. Ketut Putrajaya, 2018. Accuracy of ALOS AVNIR-2 Image Technology for Mapping Oxygen Need and Green Open Space Priority in Denpasar City, Bali. Journal of Engineering and Applied Sciences, 13: 3594-3600.