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Karakteristik Time Series Reflektansi Tanaman Padi Varietas Ciherang Dengan Analisis RGB Citra Fotografi Cahyono, Bowo Eko; Nugroho, Agung Tjahjo; Husen, Jamal
Jurnal Fisika FLUX Vol 15, No 1 (2018): Jurnal Fisika FLUX Edisi Februari 2018
Publisher : Lambung Mangkurat University Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/flux.v15i1.4381

Padi merupakan tanaman pangan yang memiliki peran dan manfaat penting bagi masyarakat khususnya di Indonesia.Tanaman padi banyak ditemukan di lingkungan sekitar khususnya yang bertempat tinggal di daerah pedesaan. Tanaman padi memiliki banyak varietas yang mudah menyesuaikan terhadap lingkungan dan cara tanam. Seiring kemajuan ilmu pengetahuan dan teknologi kondisi tanaman pertanian seperti padi dapat dipantau secara cepat dari udara. Metode yang digunakan berupa pengamatan melalui helikopter ataudrone atau pesawat tanpa awak. Penelitian ini bertujuan untuk mengetahui karakteriktime seriesusia tanaman padi varietas Ciherang berdasarkan ekstraksi nilai reflektansi spektrum RGB ternormalisasi. Penelitian yang dilakukan berupa pengambilan data gambar tanaman padi dan kertas putih yang diletakkan di atas daun padi. Gambar diambil dari awal usia tanam (HST=hari setelah tanam) sampai panen. Gambar tersebut dicropping untuk memisahkan gambar tanaman padi dan kertas putih. Selanjutnya gambar diekstraks menggunakan software MATLAB R2014a berdasarkan spektrum warna red, green, dan blue (RGB). Hasil ekstraksi tersebut berupa nilai reflektansi RGB dan dinormalisasikan. Selanjutnya dibuat plot nilai reflektansi RGB ternormalisasi terhadap usia tanam. Hasil yang diperoleh dari penelitian ini adalah karakteristik time series reflektansi tanaman padi varietas Ciherang berdasarkan usia tanamnya. Berdasarkan hasil seluruh model grafik yang diperoleh dari ploting 3D dan 2D dapat dinyatakan bahwa nilai reflektansi spektrum R dan B terus meningkat seiring bertambahnya HST. Sedangkan nilai reflektansi spektrum G terus meningkat sampai sekitar HST 50 dan untuk HST berikutnya nilai reflektansi spektrum G menurun dikarenakan tanaman padi memasuki fase generatif sehingga daun tanaman padi tersebut mulai menguning dan cahaya green yang direfleksikan oleh tanaman padi juga mulai menurun.

THE RATE OF LAND COVER CHANGE USING LANDSAT DATA IN COAL MINING AREA OF SAWAH LUNTO CITY, INDONESIA Cahyono, Bowo Eko; Frahma, Yazella Feni; Nugroho, Agung Tjahjo
Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Vol 9, No 2 (2019)
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/jpfa.v9n2.p189-203

Sawahlunto city is well-known for coal mining region. As in 2010, there have been at least 12 mining companies exploring coal resources in the region. As time passes, land cover conditions have gradually decreased due to mining activities. This region on which was originally covered by various vegetation and ecosystem have systematically transformed into open areas for coal mining. The use of remote sensing technology for land cover monitoring has been commonly well-developed in accordance with the need for improvement of detailed information about the changes of land use coverage. This study examines the land cover changes using supervised classification method based on Landsat data. The method focuses on four dominant classes of land cover in the region, namely forest, mining, settlement, and water resources. The classification processes were performed based on true-color composite satellite images. The results show that the overall accuracies of classification are 91.68 %, 92.49 %, 93.69 %, and 93.74 % in 2000, 2006, 2011, and 2016 respectively. It was also found that forest is the largest area in the coal mining area which, in some sense, tends to continuously decrease in terms of land cover in the last 15 years. The rate of forest area degradation achieved its maximum between 2006 and 2011.

The Rate of Land Cover Change using Landsat Data in Coal Mining Area of Sawah Lunto City, Indonesia Cahyono, Bowo Eko; Frahma, Yazella Feni; Nugroho, Agung Tjahjo
Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Vol 9, No 2 (2019)
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/jpfa.v9n2.p189-203

Sawahlunto city is well-known for coal mining region. As in 2010, there have been at least 12 mining companies exploring coal resources in the region. As time passes, land cover conditions have gradually decreased due to mining activities. This region on which was originally covered by various vegetation and ecosystem have systematically transformed into open areas for coal mining. The use of remote sensing technology for land cover monitoring has been commonly well-developed in accordance with the need for improvement of detailed information about the changes of land use coverage. This study examines the land cover changes using supervised classification method based on Landsat data. The method focuses on four dominant classes of land cover in the region, namely forest, mining, settlement, and water resources. The classification processes were performed based on true-color composite satellite images. The results show that the overall accuracies of classification are 91.68 %, 92.49 %, 93.69 %, and 93.74 % in 2000, 2006, 2011, and 2016 respectively. It was also found that forest is the largest area in the coal mining area which, in some sense, tends to continuously decrease in terms of land cover in the last 15 years. The rate of forest area degradation achieved its maximum between 2006 and 2011.

Analisis Tutupan Lahan Menggunakan Metode Klasifikasi Tidak Terbimbing Citra Landsat di Sawahlunto, Sumatera Barat Bowo Eko Cahyono; Ervin Budi Febriawan; Agung Tjahjo Nugroho
Teknotan: Jurnal Industri Teknologi Pertanian Vol 13, No 1 (2019): TEKNOTAN, Agustus 2019
Publisher : Fakultas Teknologi Industri Pertanian

Penginderaan jauh merupakan pengkajian atas informasi mengenai daratan dan permukaan air bumi dengan menggunakan citra yang diperoleh dari sudut pandang atas (overhead perspective), menggunakan radiasi elektromagnetik dalam satu beberapa bagian dari spektrum elektromagnetik yang dipantulkan atau dipancarkan dari permukaan bumi. Teknologi ini digunakan untuk menganalisis tutupan lahan melalui analisis citra hasil perekaman satelit penginderaan jauh Landsat di Kota Sawahlunto, Provinsi Sumatera Barat, Indonesia (0°40′16″ LU dan 100°47′21″ BT) yang diduga mengalami perubahan karena adanya aktivitas pertambangan batu bara. Metode klasifikasi tutupan lahan yang digunakan adalah metode klasifikasi tidak terbimbing pada band RGB (Red, Green, and Blue). Hasil penelitian mengindikasikan adanya perubahan lahan berupa perubahan luas hutan pada periode tahun 2000 – 2006, 2006 – 2011, dan 2011 - 2016 masing-masing sebesar 1,19 km2, 19,72 km2, dan 7,27 km2. Nilai matrik konfusi menunjukkan overall accuracy tertinggi terdapat pada tahun 2000 sebesar 100% dan terendah pada tahun 2016 sebesar 92,5%. Akurasi yang beragam ini terjadi karena ada pengaruh dari tingkat cloud cover citra yang digunakan. Cloud cover pada tahun 2000 sebesar 9,0% dan cloud cover pada tahun 2016 sebesar 14,3%. Semakin tinggi cloud cover data yang digunakan maka akan semakin rendah overall accurary yang didapat dan semakin rendah cloud cover data yang digunakan maka akan semakin tinggi overall accurary yang didapat. Hasil penelitian juga menunjukkan bahwa aktifitas pembukaan lahan hutan menjadi tambang, pemukiman, dan danau/air pada periode tahun 2000 – 2011 berpengaruh negatif pada kualitas dari kehijauan hutan. Sebaliknya, dengan berkurangnya aktifitas pembukaan lahan menjadi pemukiman, tambang, dan danau/air akan berdampak positif pada kualitas hutan.

Analisis Kesehatan Mangrove di Probolinggo Menggunakan Data Sentinel-2A Rizky Mauli Diyah; Bowo Eko Cahyono; Agung Tjahjo Nugroho
Natural B, Journal of Health and Environmental Sciences Vol 5, No 2 (2019)
Publisher : Natural B, Journal of Health and Environmental Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar

Probolinggo is one of the regencies which is directly adjacent to the Madura Strait and this area has a coastal area of around 71,893 Km. This long coastal area cause the area has high risk of coastal abrasion, so that monitoring of the condition of mangrove forests is needed to prevent the abrasion. In the coastal areas of probolinggo mangrove forests are used into purposes fields such as tourism, disaster prevention, education and conservation. To maximize the role of the mangrove forests, the analysis of mangrove health analysis in Probolinggo is very important to do. Because of the large research area, the utilization of remote sensing becomes an important alternative method. This study utilizes Sentinel-2A satellite imagery using the supervised classification method for area classification and the Normalized Different Vegetation Index method to classify mangrove health. Based on the results of the supervised classification analysis, the accuracy test using overall accuracy gives the accuracy result of 96.57% and from the mangrove health classification it is known that most of the mangroves in Probolinggo are in good health with a percentage of 75.75% of the total mangrove area i.e 367.04 hectares . Further research on the correlation of mangrove health to water quality is suggested to get more complex information about mangrove health.

Perbandingan Citra Hasil Rekonstruksi Metode Newton-Raphson dan Landweber pada Electrical Capacitance Tomography: Analisis Resolusi dan Akurasi Rifang Pri Asmara; Agung Tjahjo Nugroho; Endhah Purwandari
Jurnal Fisika dan Aplikasinya Vol 16, No 1 (2020)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v16i1.5238

Penelitian untuk membuat desain Electrical Capacitance Tomography dilakukan menggunakan metode numerik Finite Difference Method (FDM) untuk forward problem dan ditentukan tingkat akurasinya terhadap metode analitik. Solusi berbasis FDM yang diperoleh, digunakan dalam proses rekonstruksi menggunakan metode Landweber dan Newton-Raphson. Perbandingan citra hasil rekonstruksi dari kedua metode dianalisis berdasarkan resolusi dan akurasi citra yang dihasilkan. Hasil penelitian ini menunjukkan bahwa akurasi Finite Difference Method dengan melakukan pemotongan garis pada objek domain, didapatkan 90,57% pada garis horizontal dan 87,43% pada garis vertikal. Adapun hasil untuk rekonstruksi didapatkan akurasi proses rekonstruksi 98% untuk Newton-Raphson dan 88% untuk Landweber. Resolusi citra yang direkonstruksi dengan menggunakan Newton-Raphson mampu membedakan 2 benda dengan jarak pisah minimal 3 cm, sedangkan Landweber mampu membedakan 2 benda dengan jarak pisah minimal 8 cm.

The Rate of Land Cover Change using Landsat Data in Coal Mining Area of Sawah Lunto City, Indonesia Bowo Eko Cahyono; Yazella Feni Frahma; Agung Tjahjo Nugroho
Jurnal Penelitian Fisika dan Aplikasinya (JPFA) Vol. 9 No. 2 (2019)
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/jpfa.v9n2.p189-203

Sawahlunto city is well-known for coal mining region. As in 2010, there have been at least 12 mining companies exploring coal resources in the region. As time passes, land cover conditions have gradually decreased due to mining activities. This region on which was originally covered by various vegetation and ecosystem have systematically transformed into open areas for coal mining. The use of remote sensing technology for land cover monitoring has been commonly well-developed in accordance with the need for improvement of detailed information about the changes of land use coverage. This study examines the land cover changes using supervised classification method based on Landsat data. The method focuses on four dominant classes of land cover in the region, namely forest, mining, settlement, and water resources. The classification processes were performed based on true-color composite satellite images. The results show that the overall accuracies of classification are 91.68 %, 92.49 %, 93.69 %, and 93.74 % in 2000, 2006, 2011, and 2016 respectively. It was also found that forest is the largest area in the coal mining area which, in some sense, tends to continuously decrease in terms of land cover in the last 15 years. The rate of forest area degradation achieved its maximum between 2006 and 2011.

DIRECT SCATTERING PROBLEM FOR MICROWAVE TOMOGRAPHY Agung Tjahjo Nugroho
UNEJ e-Proceeding 2016: Proceeding The 1st International Basic Science Conference
Publisher : UPT Penerbitan Universitas Jember

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The Direct scattering problem is composed in a pair of integral equations. The equivalence current density and the ratio of dielectric contrast are set as variables by applying volume equivalence principle. The problem is solved using the method of moment (MM). The MM solutions are compared to the exact solutions. The results show that the MM solution is accurate. Perfect solution is generated for scattering from a wide range dielectric contrast. But, it is sensitive to cell’s size. A good result is provided at comparably small cell’s size.

Karakteristik Time Series Reflektansi Tanaman Padi Varietas Ciherang Dengan Analisis RGB Citra Fotografi Bowo Eko Cahyono; Agung Tjahjo Nugroho; Jamal Husen
Jurnal Fisika FLUX Vol 15, No 1 (2018): Jurnal Fisika Flux: Jurnal Ilmiah Fisika FMIPA Universitas Lambung Mangkurat
Publisher : Lambung Mangkurat University Press

Padi merupakan tanaman pangan yang memiliki peran dan manfaat penting bagi masyarakat khususnya di Indonesia.Tanaman padi banyak ditemukan di lingkungan sekitar khususnya yang bertempat tinggal di daerah pedesaan. Tanaman padi memiliki banyak varietas yang mudah menyesuaikan terhadap lingkungan dan cara tanam. Seiring kemajuan ilmu pengetahuan dan teknologi kondisi tanaman pertanian seperti padi dapat dipantau secara cepat dari udara. Metode yang digunakan berupa pengamatan melalui helikopter ataudrone atau pesawat tanpa awak. Penelitian ini bertujuan untuk mengetahui karakteriktime seriesusia tanaman padi varietas Ciherang berdasarkan ekstraksi nilai reflektansi spektrum RGB ternormalisasi. Penelitian yang dilakukan berupa pengambilan data gambar tanaman padi dan kertas putih yang diletakkan di atas daun padi. Gambar diambil dari awal usia tanam (HST=hari setelah tanam) sampai panen. Gambar tersebut dicropping untuk memisahkan gambar tanaman padi dan kertas putih. Selanjutnya gambar diekstraks menggunakan software MATLAB R2014a berdasarkan spektrum warna red, green, dan blue (RGB). Hasil ekstraksi tersebut berupa nilai reflektansi RGB dan dinormalisasikan. Selanjutnya dibuat plot nilai reflektansi RGB ternormalisasi terhadap usia tanam. Hasil yang diperoleh dari penelitian ini adalah karakteristik time series reflektansi tanaman padi varietas Ciherang berdasarkan usia tanamnya. Berdasarkan hasil seluruh model grafik yang diperoleh dari ploting 3D dan 2D dapat dinyatakan bahwa nilai reflektansi spektrum R dan B terus meningkat seiring bertambahnya HST. Sedangkan nilai reflektansi spektrum G terus meningkat sampai sekitar HST 50 dan untuk HST berikutnya nilai reflektansi spektrum G menurun dikarenakan tanaman padi memasuki fase generatif sehingga daun tanaman padi tersebut mulai menguning dan cahaya green yang direfleksikan oleh tanaman padi juga mulai menurun.

Prototype Portable Electrical Resistance Tomography Ahmad Zaenal Hayat; Agung Tjahjo Nugroho; Nurul Priyantari
IPTEK The Journal for Technology and Science Vol 32, No 3 (2021)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j20882033.v32i3.8843

Tomography is a way to describe something non-destructively. Some types of Tomography are Electrical Resistance Tomography (ERT), Electrical Impedance Tomography (EIT), and Electrical Capacitance Tomography (ECT). This study aims to combine the ECT and ERT systems. The combination uses the ERT technique (Borehole method) and develops until it can be used like ECT. This research conducts three significant stages (design making, designed realization, and examination). The examination is carried out by simulation and experimental measurement. The simulation result is compared to the result of the experimental measurement. The result shows that both have the same patterns, but it has the amplitude of voltage difference pattern. It is because the resistivity result affects the measured voltage difference result. The higher the resistivity result of the medium, the smaller the measured voltage difference.Tomography is a way to describe something non-destructively. Some types of Tomography are Electrical Resistance Tomography (ERT), Electrical Impedance Tomography (EIT), and Electrical Capacitance Tomography (ECT). This study aims to combine the ECT and ERT systems. The combination uses the ERT technique (Borehole method) and develops until it can be used like ECT. This research conducts three significant stages (design making, designed realization, and examination). The examination is carried out by simulation and experimental measurement. The simulation result is compared to the result of the experimental measurement. The result shows that both have the same patterns, but it has the amplitude of voltage difference pattern. It is because the resistivity result affects the measured voltage difference result. The higher the resistivity result of the medium, the smaller the measured voltage difference.

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