Dulbahri Dulbahri, Dulbahri
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Mapping of Marine Area Boundary of Central Java Province using Differential GPS Survey Method

Forum Geografi Vol 16, No 2 (2002)
Publisher : Forum Geografi

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Abstract

The development of GPS (Global Positioning System) technology which is measuring position by satellite, has taken a great metodology aspect of position on surface of earth. The standard GPS measurement takes an absolute positioning. To develop the accurate abd precision, it is used the differential method. Differential GPS measurement can be much more accurate than standard GPs measurement, wherever the method uses one receiver as base station/ reference and the other receiver as field station in a same time. That could reduce and eliminate drifts and errors. The aim of research is use the differential method of GPS survey to map the ocean boundary of Central Java Province. Physical data which neede are base line and base point. Base line were taken from obsrvation of longtime Landsat TM image band 5th based o opinion that shore line are clear seems and easy to interpreted at 10.00 am according to Landsat satellite reording time and the lowest tide time as base line. Location of lowest tide were selected at conspicuous place, such as cape, dry shore, etc and measured base on the BPN (Badan Pertahanan Nasional) base/ reference point (orde 2 and 3) on the district, with GPS differential metod. Twelve miles distance from base line of ocean bounddary is belong to province and 1/3 of is belong to district. Characteristic of marine landform as cape, bay, estuaria, attended to international rules. Final report of the research were 1) oean boundary map of Center Java Province, 2) the location and base/ reference points (orde 2 and 3) that could be reference as a base point differential method.

Mapping of Marine Area Boundary of Central Java Province using Differential GPS Survey Method

Forum Geografi Vol 16, No 2 (2002)
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Original Source | Check in Google Scholar | Full PDF (1525.824 KB)

Abstract

The development of GPS (Global Positioning System) technology which is measuring position by satellite, has taken a great metodology aspect of position on surface of earth. The standard GPS measurement takes an absolute positioning. To develop the accurate abd precision, it is used the differential method. Differential GPS measurement can be much more accurate than standard GPs measurement, wherever the method uses one receiver as base station/ reference and the other receiver as field station in a same time. That could reduce and eliminate drifts and errors. The aim of research is use the differential method of GPS survey to map the ocean boundary of Central Java Province. Physical data which neede are base line and base point. Base line were taken from obsrvation of longtime Landsat TM image band 5th based o opinion that shore line are clear seems and easy to interpreted at 10.00 am according to Landsat satellite reording time and the lowest tide time as base line. Location of lowest tide were selected at conspicuous place, such as cape, dry shore, etc and measured base on the BPN (Badan Pertahanan Nasional) base/ reference point (orde 2 and 3) on the district, with GPS differential metod. Twelve miles distance from base line of ocean bounddary is belong to province and 1/3 of is belong to district. Characteristic of marine landform as cape, bay, estuaria, attended to international rules. Final report of the research were 1) oean boundary map of Center Java Province, 2) the location and base/ reference points (orde 2 and 3) that could be reference as a base point differential method.

PENDEKATAN SEL SEDIMEN MENGGUNAICAN CITRA PENGINDERAAN JAUH SEBAGAI DASAR PENATAAN RUANG WILAYAH PESISIR (STUDI KASUS DI PESISIR UTARA PROPINSI JAWA TENGAH)

Majalah Geografi Indonesia Vol 19, No 2 (2005): September 2005
Publisher : Fakultas Geografi, Universitas Gadjah Mada

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Abstract

ABSTRAK Wilayah pesisir adalah wilayah peralihan antara darat dan taut. Terdapat banyak sekali amberdaya alam yang dapat dimanfaatkan oleh manusia, sehiagga perkernbangan wilayah pesisir emakin pesat dan kondisi ini menyebabkan konflik antara berbagai kepentingan manusia di ,ilayah tersebut. Diperlukan pengaturan ruang di wilayah pesisir untuk mengatasi konflik antar epentingan tersebut dengan menggunakan suatu pendekatan yang mempertimbangkan hubungan etiap sumberdaya dalam ekosistem wilayah pesisir dan dengan tetap memperhatikan ekosistem ersebut secara menyeluruh. Pendekatan tersebut adalah pendekatan set sedimen (sediment cell). iel sedimen adalah satuan panjang pantai yang mempunyai keseragaman kondisi fisik dengan carakieristik dinamika sedimen detain wilayah pergerakannya tidak mengganggu keseimbangan iondisi pantai yang berdekatan. Pendekatan set sedimen untuk perencanaan tats ruang pada winsipnya adalah bahwa satu unit pengelolaan adalah panjang pantai dengan karakteristik tertentu yang berkaitan dengan proses alami dan penggunaan lahan pesisir. Tujuan dart penelitian ini edalah menentukan batas set sedimen di wilayah pesisir utara Propinsi Jawa Tengah sebagai dasar penataan ruang pesisir di wilayah tersebut. Metode yang digunakan untuk menentukan sel sedimen adalah dengan interpretasi citra Landsat ETM+ tahun 2002 dan pengukuran lapangan. Hasil penelitian menunjukkan bahwa di wilayah pesisir utara Propinsi Jawa Tengah terdapat 6 sel sedimen, dimana dap sel sedimen tersebut mempunyai keseragaman kondisifisik dengan karalaeristik dinamika sedimen yang berbeda dengan sedimen set lainnya. Sel sedimen-sel sedimen tersebut meliputi : Sel sedimen 1 yang dimulai dari Muara Sungai Cisanggarung sampai sebelah timur Muara Sungai Pemali, Sel sedimen 2 yang dimulai dart sebelah Timur Sungai Pemali sampai Muara Sungai Bodri, Sel sedimen 3 yang dimulai dart Muara sungai Bodri sampai Muara Sungai Wulan, Sel Sedimen 4 yang dimulai dan muara Sungai Wulan sampai pesisir utara Kabupaten Jepara, Set sedimen 5 yang dimulai dart pesisir utara Kabupaten Pea sampai Muara Sungai Kalioso Rembang, dan Sel sedimen 6 yang dimulai dart muara Sungai Kalioso sampai pesisir utara Kabupaten Rembang, Tap-flap sel sedimen dapat digunakan sebagai dasar pengaturan peruntukan ruang kegiatan pembangunan dengan memperhatikan perilaku sedimen dengan menvusun matrik keserasian kegiatan pembangunan di wilayah pesisir.

Kajian Foto Udara dan Sistem Informasi Geografis untuk Pemetaan Kondisi Peresapan Air Sub DAS Wedi Kabupaten Klaten, Jawa Tengah

Majalah Geografi Indonesia Vol 24, No 2 (2010): September 2010
Publisher : Fakultas Geografi, Universitas Gadjah Mada

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Abstract

ABSTRACT The study was conducted in Klaten Regency at Wedi Sub Watershed, part of Dengkeng Watershed. The study aimed to: 1) study the interpretation accuracy of black and white Panchromatic Aerial Photograph scaling 1: 50.000 in identifying the soil factor, slope, landuse, vegetation density, and land conversation, related to the influences  toward  water  infiltration  condition  in  the  research  area;  2)  make  the zonation  of  infiltration  capability  and  water  infiltration  condition  based  on  land factors  the  result  of  aerial  photograph  interpretation;  and  3)  study  the  spatial distribution pattern of water infiltration condition in the research area and analyze to the distribution according to spatial. The research method used aerial photograph interpretation with supported by limited survey for field test, by sampling method was stratified sampling. The method of analysis applied spatial analysis by using Geographical Information System (GIS). The result of the study showed that: 1) the level of aerial photograph accuracy for  interpreting  determinate  factors  of  water  infiltration  in  the  research  area  is acceptable each with the accuracy level of: slope 89.47%; soil texture 82.14%; land use 90.16%; vegetation density 88.89%; and land conservation 80.88%. It mean that although the accuracy level achieved had not been included in very good category, the aerial photograph still can be used in this study; 2) the condition of water infiltration in the research area tended to be relative still good,  indicated by the of the land unit in status of ‘critical’ in the width no more than 25% (30.496 km2). The land unit in status of ‘begin to be rather critical’ in the width of 55.692 km2 or 50.97 %; while the remaining 3.154 km2 or 20.62% was in the status of ‘natural normal’ and 22.544 km2 or 20.62% had ‘good’ status; 3) In the research area, the space of land units with the condition of good infiltration had no spatial relevance to the space of land units and the great infiltration capability.

Penggunaan Data Penginderaan Jauh dan Sistem Informasi Geografis untuk Pembuatan Prototipe Perangkat Lunak Simulasi Penyebaran Kebakaran Hutan

Majalah Geografi Indonesia Vol 31, No 1 (2017): Maret 2017
Publisher : Fakultas Geografi, Universitas Gadjah Mada

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Abstract

Telah didesain dan disusun prototipe perangkat lunak model interaktif kebakaran hutan, yang dapat memberikan skenario terjadinya kebakaran hutan dengan masukan berupa lokasi titik api (hotspot) dan keluaran berupa informasi lokasi penyebaran kebakaran, luas kebakaran, waktu simulasi yang diperlukan untuk mencapai luas kebakaran serta kecepatan penyebaran kebakaran. Prototipe model interaktif ini dibangun dengan mendefinisikan suatu satuan perluasan eskalasi kebakaran (FirePixel) yang mewakili granularitas data riil lapangan sebesar 400X400 m, letak (posisi geografis) dan luasan pengamatan simulasi kebakaran yang dapat dikustomisasi (disetting) oleh pengguna secara interaktif dengan asumsi kondisi pada sebuah satuan perluasan eskalasi kebakaran atau Fire Pixel diasumsikan homogen dengan parameter konfigurasi vegetasi, kelerengan, sebaran gambut, sebaran batubara sebagai faktor internal dan faktor eksternal yaitu faktor tetangga terdekat, kecepatan dan arah angin, temperatur rata-rata, kelembaban rata-rata dari simulasi dapat dikustomisasi secara interaktif pada saat simulasi. Dalam perhitungan proses kebakaran dan proses pemadaman kebakaran hutan didefinisikan faktor percepatan proses kebakaran yang merupakan akumulasi dari faktor internal dan eksternal yang secara langsung mempengaruhi kecepatan terjadinya proses kebakaran dan pemadaman kebakaran hutan. Perubahan fase kebakaran diperoleh melalui pemodelan matematik dari faktor internal dan eskternal mulai dari fase mulai terbakar sampai kebakaran padam. Hasil validasi prototipe diperoleh kebenaran yang dapat diterima dalam perhitungan statistik menggunakan Uji Kolmogorov-Smirnov Dua Sampel. Hasil skenario 1 menghasilkan nilai KD hitung (=1,5722) < KD tabel (-1,9176) dan skenario 2 menghasilkan nilai KD hitung (=1,36) < nilai KD tabel (=1,5722). It has been designed and structured software prototype interactive model of forest fires, which can provide forest fire scenario, input is the location of hotspots and the output of the location information spread of fire, extensive fires, the simulation time required to reach the area of the fires and speed of fire deployment.The prototype interactive model is built by defining an expansion unit escalation fire (FirePixel) that represent real data granularity field of 400x400 m, position (geographical) and the extent of the fire simulation observations that can be customized (be set) by the user interactively by assuming the conditions in a expansion unit escalation of fire or fire pixel assumed homogeneous with the parameters : configuration of vegetation, slope, the distribution of peat, coal distribution as internal factors and external factors that factor nearest neighbors, wind speed and direction, average temperature, average humidity of the simulation can be customized interactively during the simulation. In the calculation of the fire and the fire fighting forest, fires the acceleration factor is defined as an accumulation of internal and external factors that directly affect the speed of the process of extinguishing fires and forest fires. Fire phase change obtained through mathematical modeling of internal and external factors ranging from phase start to burn until the fire goes out. Prototype validation results obtained acceptable truth in statistical calculations using the Kolmogorov Smirnov Two Sample. Results 1 scenario produces KDcount value (= 1.5722)