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Journal : JURNAL ILMIAH GEOMATIKA

ASSESSMENT OF THE RICE FIELD SUSTAINABILITY IN JAVA ON BASIS OF REGIONAL SPATIAL USE PLANNING (RTRW)

GEOMATIKA Vol 16, No 1 (2010)
Publisher : Badan Informasi Geospasial in Partnership with MAPIN

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Abstract

The problems of the rice field sustainability in Java as the national rice producer are induced by the rice field land conversion into settlement and industrial areas due to the increase of population. The rice field conversion causes the decrease of both land quantity and quality. As mentioned in Act Number 26/2007 concerning Spatial Use management, the goal of implementing the spatial use management is to achieve the protection of spatial use function and the prevention of the negative impacts of the environment resulted from the spatial use implementation. The objective of this study is to assess the consistency of the governmental policies in implementing the Act Number 26/2007 to achieve the rice field sustainability on the basis of agro-ecological concept. By using the GIS modelbase, the rice field agro-ecological zones proposed as standard rice field areas for the benchmark of the sustainable rice field agriculture management system were synthesized from the spatial database of land system, land cover, area status, agro-climate, irrigation condition, social and culture integrated in the administration boundary layers. The results show that the governmental policies from non-agricultural sector in allocating the area status of the settlement areas as presented at the provincial regional spatial use planning map (RTRW map) have not fully consistent to the regulations as stated in Act Number 26/2007 for protecting the productive rice field function as the national rice producer. The potential loss of the rice production caused by the implementation of the rice field conversion into settlement areas allocated at the productive rice field agro-ecological zones is predicted 3.5 million tons per year.Key words: rice field agro-ecological zone, spatial use management, GIS modelbase, land conversion.ABSTRAKMasalah keberlanjutan lahan sawah di Jawa sebagai lumbung beras nasional dipicu oleh konversi lahan sawah menjadi daerah permukiman dan industri karena peningkatan jumlah penduduk. Konversi lahan sawah mengakibatkan penyusutan dan degradasi lahan sawah. Sebagaimana yang diamanatkan dalam Undang-Undang No.26/2007 tentang Penataan Ruang, tujuan penataan ruang adalah untuk melindungi fungsi penggunaan ruang dan mencegah dampak lingkungan sebagai akibat dari implementasi penggunaan ruang. Tujuan penelitian ini adalah untuk mengkaji konsistensi kebijakan pemerintah sebagai implementasi Undang-Undang No. 26/2007 dalam menjaga keberlanjutan lahan sawah berdasarkan konsep agrokologi. Dengan menggunakan basismodel SIG, zona agroekologi yang diusulkan sebagai acuan untuk penetapan luasan baku lahan sawah disintesa dari basisdata sistem lahan, penutup lahan, status kawasan, agroklimat, kondisi irigasi, dan sosial-budaya yang diintegrasikan dalam layer batas wilayah administrasi. Hasil penelitian menunjukkan bahwa kebijakan pemerintah di sektor non-pertanian dalam pengalokasian status kawasan permukiman ternyata tidak secara penuh konsisten dengan Undang-Undang No.26/2007 dalam menjaga keberlanjutan lahan sawah produkif sebagai lumbung beras nasional. Potensi kerugian proudksi beras dari akibat implementasi kebijakan tersebut diperkirakan mencapai 3,5 juta ton per tahun.Kata Kunci: zona agroekologi lahan sawah, penataan ruang, basismodel SIG, konversi lahan.

DINAMIKA PEMANFAATAN LAHAN BENTANG ALAM GUMUK PASIR PANTAI PARANGTRITIS, KABUPATEN BANTUL

GEOMATIKA Vol 16, No 2 (2010)
Publisher : Badan Informasi Geospasial in Partnership with MAPIN

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Abstract

The sand dunes’ range or landscape in Parangtritis beach are not instantly formed instead they are formed over a long period of time to form their distinct and unique physical shapes. On the other hand, the existence of sand dunes is threatened by a number of forces which are potentially damaging to their survival. This research is intended to analyzing land utilization in the area of sand dunes.Keywords: Landuse, landscape, sand dune, coastal.ABSTRAKHamparan atau bentang alam gumuk pasir di Pantai Parangtritis tidak terbentuk secara instan, tetapi dalam kurun waktu yang cukup lama membentuk kenampakan fisik yang menarik dan unik. Disisi lain, keberadaan gumuk pasir menghadapi berbagai tekanan yang berpotensi merusak kelestariannya. Penelitian ini bertujuan menganalisis pemanfaatan lahan di kawasan bentang alam gumuk pasir.Kata Kunci: Penggunaan Lahan, bentanglahan, gumuk pasir, pesisir

COASTAL MORPHODYNAMIC STUDY USING MULTI TEMPORAL DATA IN BANTEN BAY, INDONESIA

GEOMATIKA Vol 15, No 2 (2009)
Publisher : Badan Informasi Geospasial in Partnership with MAPIN

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Abstract

Banten Bay and its surrounding area has been indicated as the coastal areas that serious the environmental problems due to poor management of the natural marine resources that has been going for a long time. This study was carried out focusing on the coastal morphodynamic processes, using the multi temporal satellite images as the main sources of the information. The topographic data of year 1923 has been used for the baseline data for research carried out supported by others thematic data that can be collected for the area of study. The multi temporal images used were aerial photographs at 1:30.000 scale acquired in 1981/1982 and at 1:50.000 scale acquired in 1994; SPOT XS images dated 1990 and 1997 as well as LANDSAT MSS of 1976; LANDSAT TM of 1996 & 2000. Geomorphological map for the study area has been prepared on 1:50,000 scale and the coastal morphodynamic were studied in detail using remote sensing approach completed with the ground-truthing using stratified random sampling techniques. Physical aspect related to coastal changes can be treated throughout vector data gatherred from topographic and the thematic data. The results indicate that there were coastal changes has been found in some where Eastern part of the coast line segment close to Pulau Dua (Dua Islands) as tombolo formation. To the east, Ciujung Delta has been growing with typical bird foot delta. On the other hand, abrasion process took place in Tanjung Pontang (old Ciujung Delta) and also within the coast line segment at Lontar Village. The rate of abration processes within the study area has been 0,0436 mm/yr for the coral islands distributed within shallow coastal sea in the study area, 0,0316 mm/yr along the adesitic volcanic coast line at the western part of the study area, and 0,503mm/yr in soft sediment rock area. Deposition processes were also active in the coastal area between Bojonegoro up to Kamanjungan that is indicated by the bathymetry changes from 2.5 m in the year 1923 to < 1.25 m at present condition in the Karanghantu harbor at a distance of 100 m from the present coast line.Keywords: morphology, dynamics, coastal zone, remote sensing, coastline change.