Abstract
Subak is an irrigation system for agricultural land units in Bali. Subak components include palemahan (source of rice field), pawongan (human resources / farmers), and rice farming system. Subak as a typical system and local Bali built since the 7th century, until now subak system still exist in Denpasar. UNESCO, in 2011, designated Subak as a world cultural heritage. Ironically, not one regency / city, and Bali Province has spatial map of Subak, only statistic data. The era of technology and communication development, requires the ease and speed of getting the latest data and information with a high level of spatial accuracy. This paper discusses the use of geo-information technology in subak mapping. This study uses the Worldview satellite image data in Denpasar in 2015, and ArcGIS 10.3 software for mapping of land and area of subak rice fields (spatial data). The supporting data used are land resource data (LR), human resource data (pekaseh) and agricultural activities as attribute data. The result of the analysis is Denpasar City has 41 Subak in 2015, Subak area on satellite image analysis as wide as 2,008.6 ha. This result was smaller 520.4 ha than the data from Central Bureau of Statistics (CSA, Denpasar) that is 2,529 ha with value r2 = 0,8967. Furthermore, the subak information system combined subak spatial map with attribute data. From this research can be concluded that the making of information system subak spatial-based data is very helpful in the identification and analysis of subak areas for irrigation planning.
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