Wiwin Ambarwulan
Training and Education Division, Badan Informasi Geospasial (BIG)

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DERIVING INHERENT OPTICAL PROPERTIES FROM MERIS IMAGERY AND IN SITU MEASUREMENT USING QUASI-ANALYTICAL ALGORITHM Ambarwulan, Wiwin; Widiatmaka, -; Budhiman, Syarif
International Journal of Remote Sensing and Earth Sciences (IJReSES) Vol 10, No 1 (2013)
Publisher : National Institute of Aeronautics and Space of Indonesia (LAPAN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (287.639 KB) | DOI: 10.30536/j.ijreses.2013.v10.a1835

Abstract

The  paper  describes inherent optical properties  (IOP)  of  the  Berau  coastal  waters  derived from in  situ measurements  and Medium  Resolution  Imaging  Spectrometer  (MERIS) satellite  data. Field  measurements  of optical  water,  total  suspended  matter  (TSM), and  chlorophyll-a  (Chl-a) concentrations were carried out during the dry season of 2007. During this periode, only four MERISdata were  coincided with in  situ measurements on 31 August  2007. The MERIS  top-of-atmosphere radiances were atmospherically corrected using the MODTRAN radiative transfer model. The in situ optical  measurement  have  been  processed  into apparent optical properties  (AOP) and sub  surface irradiance. The remote sensing reflectance of in situ measurement as well as MERIS data were inverted into  the  IOP  using quasi-analytical algorithm  (QAA).  The  result  indicated  that coefficient  of determination (R 2) of backscattering coefficients of suspended particles (bbp) increased with increasing wavelength,  however  the  R2 of  absorption  spectra  of  phytoplankton  (aph)  decreased  with  increasing wavelength.
DYNAMIC SYSTEM MODELLING AND LAND SUITABILITY TO DEFINE PRIORITY AREAS OF SOYBEAN PLANTATION IN PADDY FIELDS IN KARAWANG, WEST JAVA Widiatmaka, Widiatmaka; Ambarwulan, Wiwin; Firmansyah, Irman; Munibah, Khursatul; Santoso, Paulus B.K.; Sudarsono, Sudarsono
AGRIVITA, Journal of Agricultural Science Vol 36, No 3 (2014)
Publisher : Faculty of Agriculture University of Brawijaya and Indonesian Agronomic Assossiation

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Abstract

One of the agricultural public commodities in Indonesia which still cannot fulfill its domestic consumption needs is soybean. The objectives of the research, which was conducted in Karawang Regency, West Java, Indonesia, were to: (i) identify the suitable area for soybean plantations in paddy fields, (ii)  assess the development of soybeans in land use and socio-economic context, and (iii) plan the spatially soybean plantation. A soil survey and land evaluation for soybean was completed. IKONOS imagery was applied to delineate paddy fields while a dynamic system modelling was developed using Powersim 8.0 software. The results of the research showed that the suitability class for soybean plantation in the paddy fields of Karawang Regency ranges from unsuitable (N) to suitable (S2), with limiting factors being temperature, fertility, nutrients retention, slope, erosion, rooting media and toxicity. Very limited arable land  has been used so far for soybeans plantations due to low economic returns. The model predicts that, should the development of soybean continues in its business as usual path, a deficit of soybean will occur in 2030. The model provides alternative scenarios to reduce the deficit. Prioritization was done spatially using the suitable land gradually, corresponding to the government budget availability.
PERENCANAAN SPASIAL PENINGKATAN PRODUKSI KEDELAI BERBASIS KESESUAIAN LAHAN DI KABUPATEN LOMBOK TIMUR PROVINSI NUSA TENGGARA BARAT Widiatmaka, Widiatmaka; Ambarwulan, Wiwin; Munajati, Sri Lestari; Munibah, Khursatul; Murtilaksono, Kukuh; Tambunan, Rudi P; Nugroho, Yusanto A; Santoso, Paulus B.K.; Suprajaka, Suprajaka; Nurwadjedi, Nurwadjedi
MAJALAH ILMIAH GLOBE Vol 15, No 2 (2013)
Publisher : Badan Informasi Geospasial

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (370.475 KB) | DOI: 10.24895/MIG.2013.15-2.86

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Pemanfaatan data survei tanah dan evaluasi lahan dilakukan untuk perencanaan peningkatan produksi kedelai menjawab tantangan kelangkaan pasokan kedelai di Kab. Lombok Timur, Provinsi Nusa Tenggara Barat. Data yang digunakan adalah hasil survei oleh Pusat Pemetaan dan Integrasi Tematik, Badan Informasi Geospasial dilengkapi dengan analisis citra dan evaluasi lahan fisik dan ekonomi untuk kedelai. Analisis kesesuaian lahan fisik dan ekonomi untuk kedelai dilakukan menggunakan Automated Land Evaluation System (ALES). Penggunaan lahan diinterpretasi menggunakan citra SPOT-5, dipertajam dengan data lebih detil menggunakan citra IKONOS dari Kementerian Pertanian. Hasil-hasil analisis diinterpretasi dalam term potensi intensifikasi kedelai pada lahan sawah eksisting dan potensi perluasan tanaman kedelai pada lahan kering yang potensial. Hasil analisis menunjukkan bahwa di wilayah Kabupaten Lombok Timur masih dimungkinkan dilakukan intensifikasi dan ekstensifikasi untuk peningkatan produksi kedelai dalam rangka peningkatan ketahanan pangan regional. Persoalannya, keuntungan petani dalam budidaya kedelai pada berbagai kelas kesesuaian lahan jauh lebih kecil dibandingkan pengusahaan padi sawah. Perencanaan fisik berbasis kesesuaian lahan perlu diikuti dengan upaya menciptakan kondisi agar penanaman kedelai menarik bagi petani dari sisi ekonomi.Kata Kunci: Ketahanan Pangan, SPOT-5, Kesesuaian Lahan, Sistem Evaluasi Lahan Otomatis.ABSTRACTData from soil survey and land evaluation were used in planning for increasing  soybean production, answering the lack of soybean supply in East Lombok Regency, West Nusa Tenggara Province. The results of the survey of Center for Integrated Mapping, Geospatial Information Agency were used, combined with image analysis and physical and economical land suitability analysis for soybeans. Analysis of physical and economical land suitability for soybean was performed using Automated Land Evaluation System (ALES). Land use was interpreted using SPOT-5 imagery, completed by the data of IKONOS imagery from Ministry of Agriculture. The results of the analysis were interpreted in terms of the potential intensification of soybean on existing ricefield and the potential expansion of soybean crops ondry land. The analysis showed that in East Lombok Regency, there is still possible to do the intensification and extension of soybean in order to improve regional food security. The problem is, benefit of farmers in the cultivation of soybeans in various land suitability classes are much smaller than rice cultivation. Physical planning based on land suitability needs to be coupled with efforts to create an attractive situation to farmers for planting soybean.Keywords: Food Security, SPOT-5, Land Suitability, Automated Land Evaluation System.
APPRAISAL KEBERLANJUTAN MULTIDIMENSI PENGGUNAAN LAHAN UNTUK SAWAH DI KARAWANG - JAWA BARAT Widiatmaka, Widiatmaka; Munibah, Khursatul; Sitorus, Santun R.P.; Ambarwulan, Wiwin; Firmansyah, Irman
Jurnal Kawistara Vol 5, No 2 (2015)
Publisher : Sekolah Pascasarjana UGM

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Indonesian national food sovereignty is very dependent on the supply of rice from paddy fields in Java Island. Various factors influence the farmer’s decision to continue using his farm. This study aims to analyze the sustainable use of paddy field, determinant factors and strategies for improving sustainability. The study was conducted in Karawang Regency, one of the centers of rice production in West Java. The methodology used is a multi-dimensional scaling (MDS) using 43 attributes of 5 dimensions (ecological, social, economical, technological and legal and institutional dimension). Against the sensitive attribute analysis resulting from MDS, a prospective analysis was conducted to determine the key factors of sustainability. Priority policies for improving sustainability are developed based on the location of the key factors in the prospective diagram. The research results showed that the land utilization for paddy field in Karawang is actually less sustainable. Increasing the sustainability can be done through intervention and improving performance, preferably on sensitive attributes resulting from leverage analysis, covering 16 attributes. Priority policies is directed in the 5 key factors resulting from prospective analysis. Policies suggested are the tightening of new permits for building, strict implementation of the official spatial land use planning and delineation of agricultural land for sustainable food crops, counseling the community, revitalizing the role of BULOG, provision of subsidies as well as capital assistance to farmers.
DAYA DUKUNG LINGKUNGAN BERBASIS KEMAMPUAN LAHAN DI TUBAN, JAWA TIMUR Widiatmaka, Widiatmaka; Ambarwulan, Wiwin; Purwanto, Muhamad Yanuar Jarwadi; Setiawan4, Yudi; Effendi, Hefni
Jurnal Manusia dan Lingkungan (Journal of People and Environment) Vol 22, No 2 (2015)
Publisher : Pusat Studi Lingkungan Hidup Universitas Gadjah Mada

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Evaluasi daya dukung lingkungan merupakan bagian dari upaya mewujudkan pembangunan berkelanjutan. Salah satu metoda evaluasi daya dukung lingkungan adalah evaluasi berbasis kemampuan lahan. Penelitian ini bertujuan untuk melakukan evaluasi daya dukung lingkungan berbasis kemampuan lahan di Tuban, Jawa Timur. Evaluasi dilakukan dengan mengkaji kesesuaian antara kemampuan lahan dengan penggunaan lahan aktual dan alokasi Pola Ruang dalam Rencana Tata Ruang Wilayah Kabupaten. Kemampuan lahan dievaluasi pada setiap Satuan Peta Lahan yang diperoleh dari survai lapangan tahun 2014. Penggunaan lahan aktual dianalisis menggunakan citra Landsat 8 OLI tahun peliputan 2013. Hasil analisis menunjukkan bahwa kemampuan lahan di wilayah penelitian berkisar dari kemampuan lahan kelas II sampai kelas VIII. Wilayah dengan kemampuan lahan yang memungkinkan untuk pengusahaan budidaya (kelas II-IV) mencakup 78,6% wilayah studi, sementara wilayah yang tidak memungkinkan untuk budidaya (kelas V-VIII) mencakup 21,4% wilayah studi. Faktor pembatas kemampuan lahan terdiri dari tekstur tanah, kedalaman efektif, drainase, lereng dan genangan/banjir. Saat ini, 32% wilayah di Kabupaten Tuban penggunaan lahannya sesuai dengan kemampuan lahannya, 66,4% wilayah digunakan melebihi kemampuan lahannya. Dalam hal alokasi lahan pada pola ruang, 67,3% wilayah dialokasikan penggunaan lahannya sesuai dengan kemampuan lahannya, sedangkan 31% dialokasikan melebihi kemampuan lahannya. Temuan ini dapat digunakan untuk mengontrol penggunaan lahan di Kabupaten Tuban dan menjadi bahan revisi Rencana Tata Ruang Wilayah Kabupaten agar penggunaan lahan dialokasikan sesuai dengan kemampuan lahannya.
SPATIAL MULTI-CRITERIA DECISION MAKING FOR DELINEATING AGRICULTURAL LAND IN JAKARTA METROPOLITAN AREA’S HINTERLAND: CASE STUDY OF BOGOR REGENCY, WEST JAVA Widiatmaka, Widiatmaka; Ambarwulan, Wiwin; Sudarsono, Sudarsono
AGRIVITA, Journal of Agricultural Science Vol 38, No 2 (2016): JUNE
Publisher : Faculty of Agriculture University of Brawijaya in collaboration with PERAGI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17503/agrivita.v38i2.746

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The hinterland of Jakarta has experienced high pressure in its land utilization due to Jakarta’s rapid development. The objective of this research was to analyse the suitable land available for agriculture. The research was conducted in Bogor, a hinterland regency of Jakarta. The methodology used includes two steps of analysis, which are land suitability and land availability analysis. Land suitability for agriculture was analysed using multi-criteria decision making method. Seven (7) criteria were included, which consist of soil class, land capability class, slope, elevation, slope aspect, land use/land cover and distance to roads. The criteria were weighted using the Analytical Hierarchy Process. Combining criteria weights and sub-criteria scores, an overlay model in Geographic Information System was applied. The result from land suitability analysis was used as a feed for determining land availability, considering the forest area status and land allocation in the official spatial land use plan. The results indicate that an area amounting to 87.5% of Bogor Regency is suitable for agriculture. Land which is suitable and available for agriculture is 16.7% of the regency’s area. Considering available land which is currently in use, the area that can be allocated for the expansion of agriculture is 3.3%.
The Spatio Temporal Dynamic of Diffuse Attenuation Coefficient in the Tropical Berau Estuary, East Kalimantan Indonesia Ambarwulan, Wiwin; Widiatmaka, Widiatmaka
Indonesian Journal of Geospatial Vol 3, No 1 (2014)
Publisher : Indonesian Journal of Geospatial

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Abstract

Abstract. The availability of light in the water column determines the euphotic zone and constrains the type and the vertical distribution of benthic species. Diffuse attenuation coefficient (Kd) is an important apparent optical property (AOP) that provide information about the attenuation of the spectral down welling solar irradiance with depth in the water. Ocean color Satellite provide global coverage of optical water quality parameters at spatial and temporal resolution. Several empirical and semi-analytical models are commonly used to derive Kd at wavelength 490 nm Kd(490) from ocean colour satellite sensors. This study present about the diffuse attenuation coefficient, Kd(490) using semi-analytical approach. The dynamic Kd(490) in the Berau Estuary water was studied and compared with those derived from ocean color satellite sensor, Medium Resolution Imaging Spectrometer (MERIS). The study indicated that Kd(490) of in situ measurement had the best correlation with the Kd(490) of MERIS data of remote sensing reflectance (Rrs) derived with FUB (Free University Berlin) algorithm (R2=0,84). The dynamic of Kd(490) from MERIS data on different date indicated that the Kd(490) have a similar pattern and decreased when going to offshore. Keywords: MERIS, Secchi disc depth, tropical coastal water, Kd(490), a semi-analytical approach
Pemetaan Cepat Kawasan Terdampak Bencana Longsor dan Banjir di Kabupaten Bangli, Provinsi Bali Wulan, Theresia Retno; Ambarwulan, Wiwin; Putra, Anggara S.; Putra, Mega D; Maryanto, Dwi; Pinem, Ferrari; Maulana, Edwin
Majalah Geografi Indonesia Vol 31, No 2 (2017): Majalah Geografi Indonesia
Publisher : Fakultas Geografi, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2368.182 KB) | DOI: 10.22146/mgi.26230

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Abstrak Teknologi penginderaan jauh mengalami perkembangan yang sangat pesat. Salah satunya adalah teknologi akuisisi data dengan menggunakan UAV (Unmanned Aerial Vehicle).  Teknologi UAV dapat dipergunakan dalam berbagai bidang, salah satunya adalah bidang kebencanaan. Tujuan penelitian ini adalah untuk melakukan pemetaan secara cepat kawasan terdampak bencana banjir dan longsor di Kabupaten Bangli, Bali dengan menggunakan teknologi UAV. Metode yang digunakan adalah pemotretan udara dengan UAV, survei lapangan dan analisis laboratorium. Pemotretan udara dilakukan satu hari pasca kejadian longsor dengan ketinggian jelajah pesawat antara 100-120 meter di atas permukaan tanah. Resolusi spasial yang dihasilkan antara 4,5 - 6,5 cm. Wilayah yang berhasil dipetakan adalah wilayah yang terdampak banjir dan longsor di Desa Songan A serta Songan B, wilayah terdampak banjir bandang Yeh Mampeh di Desa Batur Selatan, serta wilayah terdampak longsor di Desa Sukawana dan Desa Awan. Berdasarkan hasil pemotretan udara, dapat diketahui luasan daerah terdampak longsor. Lebih lanjut, strategi rehabilitasi dan rekonstruksi dapat dilakukan dengan menggunakan hasil pemotretan udara.  Abstrak Remote sensing technology is experiencing rapid developments. One of which is in the field of data acquisition that has currently adopted the use of Unmanned Aerial Vehicle (UAV). UAV technology is, for instance, employed in various studies related to disasters. This research aimed to perform a rapid mapping of flood- and landslide-affected areas in Bangli Regency, Bali using UAV technology. The applied methods included UAV-assisted aerial photography, field survey, and laboratory analysis. The aerial photography was conducted one day after the landslide event and at a recording altitude of 100-120 m above the ground. The spatial resolution produced in the photography was 4.5-6.5 cm. The mapped areas were the ones affected by floods and landslides in Songa A and Songa B Villages, flash floods in Yeh Mampeh, Batur Selatan Village, and landslides in Sukawana and Awan Villages. The aerial photography also provided the extent of the landslide-affected areas. Therefore, the post-disaster rehabilitation and reconstruction strategies can be implemented using the results of the aerial photography.  
Land Use Planning for Brackish Water Shrimp Ponds in The North Coast of Tuban, Indonesia Widiatmaka, Widiatmaka; Ambarwulan, Wiwin; Setiawan, Yudi; Purwanto, Muhamad Yanuar Jarwadi; Taryono, Taryono; Effendi, Hefni
Indonesian Journal of Geography Vol 47, No 2 (2015): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1179.354 KB) | DOI: 10.22146/ijg.9268

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Shrimp is a commodity that is increasingly in demand. The limited land resources implies the need of effective land use planning. The objective of this study was to assess land suitability for brackish water shrimp ponds, which then will be recommended for pond development in the north coast of Tuban, Indonesia. Analytical hierarchy process (AHP) were used to obtain the weight of the different criteria consisted of soil characteristics, topographic, water quality, and infrastructure criteria. The suitable land for brackish water shrimp ponds was determined by weighted overlay in GIS. The results show that the study area contains highly suitable land for brackish water shrimp ponds. Land use and land cover map was interpreted from 2014 SPOT 5 imagery. The area recommended for brackish water shrimp pond wasdelineated by taking into account the suitability and the constraints of land use and land cover.
PERENCANAAN SPASIAL PEMANFAATAN LAHAN UNTUK KOMODITAS PERKEBUNAN RAKYAT DI KABUPATEN PIDIE JAYA, PROVINSI NANGROE ACEH DARUSSALAM Widiatmaka, Widiatmaka; Zulfikar, Zulfikar; Anwar, Syaiful; Ambarwulan, Wiwin
GEOMATIKA Vol 19, No 1 (2013)
Publisher : Badan Informasi Geospasial in Partnership with MAPIN

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (329.621 KB) | DOI: 10.24895/JIG.2013.19-1.169

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ABSTRAK Kabupaten Pidie Jaya merupakan kabupaten baru yang didirikan pada tahun 2007,di Provinsi Nanggroe Aceh Darussalam (NAD). Salah satupotensi yang dapat dikembangkan untuk peningkatan pendapatan masyarakat setempat adalah perkebunan rakyat.Penelitian ini bertujuan untuk merencanakan pemanfaatan lahan untuk beberapa komoditas perkebunan rakyat. Komoditas basis dianalisis menggunakan metoda locationquotient(LQ). Kemampuan dan kesesuaian lahan dievaluasi menggunakan Sistem Informasi Geografis (SIG) berdasarkan kriteria kebutuhan tanaman. Kelayakan financial dianalisis menggunakan metode Net Present Value (NPV) dan Break Even Point (BEP). Keunggulan komparatif dan kompetitif diestimasi menggunakan metode Policy Analysis Matrix(PAM). Metode Analytical Hierarchy Process(AHP) digunakan untuk analisis persepsi masyarakat.Hasil penelitian menunjukkan bahwa kakao merupakan komoditas basis di Pidie Jaya. Selain kakao,rencana pemerintah daerah untuk mengembangkan perkebunan rakyat kelapa sawit perlu diperhitungkan. Berdasarkan analisis kemampuan lahan,wilayah yang dapat digunakan untuk pengembangan perkebunan rakyat adalah 45.784,78 hektar.Kakao dan kelapa sawit merupakan komoditas yang sesuai dikembangkan di Kabupaten Pidie Jaya,kelas kesesuaian lahannya adalah S2 (cukup sesuai) dan S3 (sesuai marginal) untuk kedua komoditas. Secara finansial, kakao dan kelapa sawit layak diusahakan pada discount factor 17 %, dengan NPV sebesar Rp26.051,158 dengan BEP produksi 505 kg hektar dan harga Rp. 5.568/kg untuk kakao, dan NPV sebesar Rp. 45.547.405 dengan BEP produksi 7.423 kg/hektar dan harga Rp. 301/kg untuk kelapa sawit. Kedua komoditas memiliki keunggulan komparatif dan kompetitif dengan nilai koefisien PCR<1 dan DRC<1. Hasil analisis persepsi masyarakat menunjukkan bahwa kakao merupakan prioritas utama untuk dikembangkan. Wilayah yang direkomendasikan untuk pengembangan kakao dan kelapa sawit di Pidie Jaya adalah seluas 27.178,97 hektar.  Kata Kunci: Kesesuaian Lahan, Kakao, Kelapa Sawit, Kelayakan Ekonomi, Proses Hierarkhi Analitik. ABSTRACT Pidie Jaya Regency is new regency in Nanggroe Aceh Darussalam (NAD) Province that was established in 2007. One of potency to be developed for income generating of local community is smallholding plantation. The purpose of this research is to plan land utilization for several commodities of smallholding plantation. Basic sector was analyzed using location quotient (LQ). Land capability and land suitability were evaluated by using Geographic Information System (GIS) based on land requirement criteria. Financial feasibility was analyzed using Net Present Value (NPV) and Break Event Point (BEP) methods.The comparative and competitive advantages were estimated by using of Policy Analysis Matrix (PAM) method. Method of Analytical Hierarchy Process (AHP) was used to analysis the community perception. The results of the research showed that cocoa is the basic commodity in Pidie Jaya. In addition to cocoa, plan of local government to develop oil palm smallholding plantation in the area was taken into account. Based on land capability analysis,the area which is able to be used for agricultural plantation commodity is 45.784,78 hectares. Cocoa and oil palm crop are suitable in Pidie Jaya Regency with actual land suitability class of S2 (suitable) and S3 (marginally suitable) for both commodities. Financially, cocoa and oil palm are feasible at discount factorof 17 %, with NPV of Rp 26.051,158 with production BEP of 505 kg/hectares and price of Rp. 5.568 /kg for cocoa and NPV of Rp. 45.547.405 with production BEP of 7.423 kg/hectares and price of Rp. 301 /kg for oil palm. Both of commodity have comparative and competitive advantages with coefficient value of PCR <1 and DRC <1. Result of community perception analysis indicates that cocoa are the main priority commodities to be developed. The area which is able to be recommended for development of cocoa and oil palm crop in Pidie Jaya is 27.178,97 hectares. Keywords : Land Suitability, Cocoa, Oil Palm, Economic Feasibility, Analytical Hierarchy Process.