Land use spatial model for building based on availability and capacity of land in territory of coastal city (Case study: Palu city)

The land use for building which keeps increasing in urban areas cause problems in the future, particularly related to the availability and capacity of land in urban areas, in fulfilling the need for development and sustainable urban development. The purpose of this research is to investigate the relationship between area of land use for building and time in the future, until when the land is capable of supporting the growth in the use for building, and how to deal with land use for building so that the land in the territory of Palu as a coastal city is capable of supporting the growth in the longer use. The research method used is the approach of quantitative method by using several analytical techniques, among others: land capacity analysis, regression analysis, projection analysis, and overlay analysis, and by using the help of some programs and software to assist the analysis. The research data consists of spatial data including data on the number of land users of protected areas and cultivation areas obtained from the Revised Map of Spatial Planning of Palu City in 2010, and aspatial data including data on the number and population growth, the number and growth of the building in form of a time series of data obtained through document registration and GIS techniques. The results showed that the land use for building in Palu city on the future having growth average 2.50% per year; cultivation area will be full of buildings in the year 2212. In order to get the land in the territory of Palu as a coastal city is capable of supporting the growth of the land use for building much longer, some efforts are needed to be done through reducing the growth and the extensive land use for building per one user, controlling the population growth, adding the width of area, and planning storey buildings in certain zones.