Judul: Pendugaan Biomassa Atas Tegakan di Hutan Rakyat Menggunakan Citra Landsat 8 (Studi Kasus di Asosiasi Petani Hutan Rakyat Wonosobo)
Abstrak: Landsat 8 is a satellite used to monitor natural resources. This satellite has a panchromatic band of 15 m x 15 m, with a spatial resolution multispectral band of 30 m x 30 m, and a thermal band with a spatial resolution of 100 m x 100 m. Therefore, it requires a fusion to produce image data with a spectral resolution as well as its high spatial panchromatic image. The image fusion technique tested was the technique of Principal Component, Multiplicative and Brovey Transform. This study aimed to obtain a biomass estimation model using an image fusion technique and to produce a biomass distribution map based on the model v chosen. Biomass calculation was carried out using allometric, coefficient of BEF (Biomass Expansion Factor) and destructive method. The selection of the best model was conducted based on F-test parameter, coefficient value of determination corrected (R2 adj) and RMSE value. The research result showed that the image fusion technique did not improve the relationship between the digital number and the biomass in the field compared to the original image. Therefore, the band original image was used to estimate the biomass in the field. The selected model used as the basis for mapping the distribution of biomass class was the exponential model on the image without fusion Y = Exp 704 + 0,00533 band 2 - 0,00161 band 7 - 0,140 band 9 - 0,00104 band 10 with an R2 adj value of 16.2% and RMSE 1.37 on the VIF less than 5. The accuracy evaluation result showed that the Overall accuracy value was 47.92% and the Kappa accuracy value was 21.26% on the mapping with 3 classes.
Keyword: Digital number, Landsat 8, Biomass, Brovey Transform, Multiplicative, Principal Component, Image fusion, Bogor Agricultural University (IPB)

Judul: Pendugaan Potensi Biomassa Atas Tegakan Menggunakan Citra Landsat 8 di Areal Kerja PT Gunung Meranti
Abstrak: Landsat 8 merupakan satelit pemantau sumberdaya alam yang memiliki sensor Onboard Operational Land Imager (OLI) dan Thermal Infrared Sensor (TIRS) dengan 10 buah kanal multispektral dan 1 buah kanal pankromatik.. Penelitian ini bertujuan untuk merumuskan model pendugaan potensi biomassa menggunakan citra Landsat 8 yang terkoreksi atmosfer (BOA reflektan), serta membuat peta sebaran biomassa dari model yang terpilih. Perhitungan biomassa dilakukan dengan menggunakan persamaan alometrik dan destruktif. Pemilihan model terbaik berdasarkan parameter Uji-T berpasangan dan nilai RMSE. Model terpilih pada reflektan adalah Y = 1118.787 exp(-8.98 band 6). Model regresi terbaik digunakan sebagai dasar dalam pembuatan peta sebaran biomassa. Hasil dari evaluasi akurasi menunjukkan nilai Overall accuracy dan Kappa accuracy tertinggi sebesar 43% dan 12.15% pada pemetaan dengan 3 kelas.
Keyword: biomassa, Landsat 8, model penduga biomassa, pemetaan

Judul: Characterizations of low alloy steel sae 4422  plated with chromic acid (Cro3)
Abstrak: Characterizations of low alloy steel SAE 4422 plated with chromic acid (CrOrO3) was use Optical Microscopy (OM), Scanning Electron Microscopy (SEM), X-Ray Diffraction (XRD), RD),Energy Dispersive Analysis of X-Ray (EDAX), Hardness Test and Roughness Test. Microstructures analysis exhibits cracks and grain boundaries microcracks as a characteristics of chrome metal found at plating metal. Perlite and Ferrite as grains of steel found at base metal with grain boundaries around it. Phase analysis of plating metal appropriate to chrome metal with lattice constant (a) is 2.559 Å and phase analysis of base metal appropriate to iron ferrite with lattice constant (a) is 3.318 Å. Both plating and base metal have cubic system. Chemical analysis of plating metal at surface section exhibits that cracks area have highest value of carbon element compare with grains and grains boundaries area. While chemical analysis of base metal at cross section exhibits that perlite have highest value of carbon element compare with ferrite and grain boundaries. The hardness value of plating metal at surface section and cross section are 753 and 637 VHN. While, the hardness value of base metal and interface area at cross section are 205 and 373 VHN. The roughness value at measurement points of chrome surface for as received sample are 0.445 μm. Observation used Optical Microscopy and Scanning Electron Microscopy exhibits surface irregularities combine to form surface texture of plating metal at surface section.
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