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"The decrease of rice-field area is one of causes of decreasing rice production in Indonesia. Physical development in many sectors has been converting rice field area into others such as industry, high ways, settlement and other agricultural areas. Because of limited possibility to extent rice field area, one of the efforts of increasing rice production is to implement intensification program. Rice paddy intensification program relates to "green revolution". Reaching success in 1984 indicated by rice self sufficiency in the year of 1984. This modernization is considered of new rice farming technology application, which is popular by the term of Panca Usaha Tani (Pranadji, 1993). Five elements of Panca Usaha Tani are well soil preparation, prime seed, irrigation sufficient and regular, optimal application of fertilizer and pesticide. Karawang is one regency in West Java Province that considered as one of national rice producing areas. This region is strategic, because it is relatively flat and located in the area of Jatiluhur irrigation. These are the reasons of Karawang chosen as a model of rice paddy intensification program. The research title is "Pemodelan Indeks Tingkat Keberhasilan Intensifikasi Sawah di Kabupaten Karawang MT 1998/1999 dan MT 1999". The objective of the research is to determine successfulness index of rice paddy intensification in Karawang Regency. The index is based on qualification of existing soil quality, efforts conducted, and rice production. By comparing each index of each kecamatan, it can be seen level of successfulness of the kecamatan in implementing intensification program, and it can be identified what factors must be improved in order to increase rice production in those kecamatan. The research questions are (1) Where is the highest and lowest of successfulness index in Karawang on growing season of the year 1998/1999 and 1999? and (2) How is the consistence of the index? The research method employed is GIS, using overlay, classification and scoring techniques with kecamatan as analytical unit. The results indicate that the highest indeces are in the southern part of Kabupaten Karawang, especially in the area of "excellent" and "poor" soil quality. Those are Kecamatan Cikampek and Telukjambe. The lowest indices are in the Northern and central of Karawang Regency, particularly on the "excellent" soil quality, Those are Kecamatan Tirtajaya and Rengasdengklok. The results also indicate that the values of indices are consistence in measuring the level of successfulness in rice paddy intensification program in Karawang Regency in growing season of the year 1998/1999 and 1999. "

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Ketahanan pangan dipengaruhi oleh beberapa faktor yaitu ketersediaan pangan, aspek pangan, pemanfaatan pangan dan kerentanan pangan. Aspek yang dapat mempengaruhi  kerentanan pangan adalah penurunan produktivitas pangan, salah satunya adalah tanaman padi yang merupakan pangan pokok di Indonesia. Penyebab penurunan produktivitas padi adalah kondisi kerentanan lingkungan suatu wilayah. Tujuan penelitian ini adalah menyusun model spasial produktivitas padi berdasarkan kerentanan lingkungan pada tiap fase tanam dengan menggunakan pendekatan teknologi inderaja dan SIG. Model spasial ini disusun berdasarkan hasil aplikasi dua model yaitu model spasial fase tanam dan model produktivitas padi. Pemodelan spasial untuk melihat sebaran fase tanam padi menggunakan metode klasifikasi random forest mempunyai akurasi keseluruhan sebesar 0,92 yang membagi fase tanam padi menjadi fase awal tanam, fase vegetatif, fase generatif dan fase bera. Variabel yang digunakan untuk membangun model spasial fase tanam padi adalah kombinasi indeks vegetasi yaitu NDVI, EVI, SAVI, NDWI, dan variabel waktu. Pemodelan spasial untuk estimasi produktivitas padi juga menggunakan model regresi dengan variabel rawan bencana yaitu bencana banjir, kekeringan, longsor dan variabel curah hujan. Algoritma dibangun berdasarkan kondisi fase tanam padi. Estimasi produktivitas padi berdasarkan pengaruh kerentanan lingkungan ini memiliki akurasi paling baik dilakukan pada fase vegetatif yaitu sebesar 0,63  dan fase generatif sebesar 0,61, sedangkan pada fase awal tanam tidak dapat digunakan untuk mengestimasi produktivitas padi karena memiliki hubungan yang lemah dengan  akurasi sebesar 0,35.

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Food security is influenced by several factors, such as food availability, food aspect, food utilization and food vulnerability. An aspect that can affect food vulnerability is food productivity decline, such as rice. Since rise is the staple food in Indonesia, its productivity decline most likely will affect Indonesia`s food vulnerability. The cause of the rice productivity decrement is the condition of environmental vulnerability of a region. The purpose of this study is to build a spatial model of rice productivity based on environmental vulnerability in each planting phase using remote sensing and GIS technology. Spatial model is built based on the result of implementation of two models which are planting phase model and rice productivity model. Spatial modelling that is built to understand the distribution of rice planting phases applied random forest classification method with an overall accuracy of 0,92. The classification result divides the rice planting phase into the initial phase of planting, vegetative, generative and fallow phase. The variables used to build spatial model of the rice planting phase are a combination of vegetation indexes namely NDVI, EVI, SAVI, NDWI, and time variables. Spatial modeling for estimating rice productivity also uses regression model with disaster-prone variables, namely floods, droughts, landslides and rainfall variables. The algorithm is built based on the condition of the rice planting phase. Estimation of rice productivity based on the influence of environmental vulnerability has the best accuracy in the vegetative phase equal to 0,63 and generative phase 0,61, whereas in the initial phase of planting it cannot be used to estimate rice productivity due to its weak relationship with accuracy 0,35.

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