Geoid (E-Journal)
Not a member yet
504 research outputs found
Sort by
ANALISIS PERSEBARAN EKOSISTEM HUTAN MANGROVE MENGGUNAKAN CITRA LANDSAT-8 DI ESTUARI PERANCAK BALI
No full textMangrove adalah tanaman pepohonan atau komunitas tanaman yang hidup di antara laut dan daratan yang dipengaruhi oleh pasang surut. Ekosistem mangrove banyak ditemukan di pantai-pantai teluk yang dangkal, estuaria, delta dan daerah pantai yang terlindung (Bengen, 2001). Kawasan Estuari Perancak memiliki luasan cukup besar dengan penggunaan lahan berupa tambak dan hutan mangrove. Wilayah perancak memiliki karakteristik yang khas. Sebagai sebuah estuari yang kondisi badan airnya dipengaruhi oleh asupan air asin dari Selat Bali dan air tawar dari sungai yang bermuara didalamnya. Dengan mengintegrasikan teknologi penginderaan jauh menggunakan citra satelit Landsat-8 diharapkan mampu mempermudah dalam mengkaji pemetaan mangrove. Algoritma yang digunakan adalah NDVI digunakan untuk menggambarkan tingkat kehijauan suatu jenis mangrove. Penentuan jenis mangrove dilakukan menggunakan metode transek 10x10m dengan kegiatan menghitung jenis mangrove, mengukur diameter dan tinggi pohon dan mengambil gambar kanopi pohon mangrove. Untuk pengambilan sampel air dilakukan di 13 titik pada saat kondisi air laut pasang. Berdasarkan hasil penelitian, didapatkan luas hutan mangrove di Estuari perancak pada tahun 2015 sebesar 651200 m². Korelasi parameter fisik hidrologi (salinitas, TSS) dengan persebaran hutan mangrove berdasarkan nilai NDVI didapatkan nilai korelasi berturut-turut adalah 0.7658, dan 0.2902 yang artinya korelasi antara NDVI dengan salinitas kuat, korelasi antara NDVI dengan TSS sangat rendah. Sehingga jika nilai NDVI tinggi tidak pasti nilai TSS tinggi pula, hal ini dikarenakan letak penelitian yang dikelilingi oleh sungai dan jarak dari bibir pantai sepanjang 3133.45
PERBANDINGAN NILAI KLOROFIL-A MENGGUNAKAN CITRA LANDSAT DAN MERIS DI DANAU SENTANI, JAYAPURA
No full textWaduk dan Danau sangat penting dalam turut menciptakan keseimbangan ekologi dan tata air. Dari sudut ekologi, waduk dan danau merupakan ekosistem yang terdiri dari unsur air, kehidupan akuatik, dan daratan yang dipengaruhi tinggi rendahnya muka air, sehingga kehadiran waduk dan danau akan mempengaruhi tinggi rendahnya muka air, selain itu, kehadiran waduk dan danau juga akan mempengaruhi iklim mikro dan keseimbangan ekosistem di sekitarnya. Dalam penelitian ini, dilakukan perbandingan klorofil-a sebagai salah satu parameter kualitas air dengan menggunakan data Meris dan Landsat Parameter kualitas air dalam sifat fisiknya yang dapat dimodelkan secara optis antara lain yaitu Total Suspended Solid (TSS), Klorofil-a, dan Collored Dissolved Organic Matter(CDOM), dan lain-lain. Tetapi pada penelitian ini hanya difokuskan untuk klorofil-a. Penelitian ini bertujuan untuk melihat citra manakah yang lebih sesuai untuk digunakan penelitian kualitas air pada danau sentani selanjutnya. Untuk algoritma dalam pengolahan citra Landsat, hanya Algoritma Jaelani paling mendekati C2WP-Eut yaitu dengan R2 = 0,795 ; RMSE = 0,399 dan RE = 16,08
ANALYSIS OF RELATIONSHIP BETWEEN TIDAL SEA WITH SEDIMENTATION (Case Study: Port Container Wharf Surabaya)
No full textIndonesian archipelagohas a high necessity of sea transportationtosupport the trade activities andmobility between one island and another. The harbor security is an important factortoensure the safety ofthe ships which are being leant there, therefore the sedimentation is neededto be observed in order to find out the changes of sedimentationso that theshipwould notrun aground. The formation ofsedimentationinthe dockis influencedby several factors, one of them istidal.Domesticdockcontainer portof Surabayais onethe docks that facilitatesdockshipsat the jettyport inEastJava. To observe the influence ofthe tides to thedock sedimentation, it is necessary to knowthe changesofsedimentation, so thesecurity of the shipsthat willbe dock could be guaranteed.The results of this study was finding theimpacts of tidal phenomena to the sediment formed in the domestic dock container port Surabaya we can conclude that when the Formzahl number is greater than the previous year, the sedimentation volume will also increase. The sedimentation volume in 2011 amounted to 9,460 m3 with Formzahl numbers of 0.662 is used as the reference to a sedimentation volume increasing in 2012 amounted to 49,537 m3 with formzahl number of 0.819. The increasing formzahl numbers which also means increase in the phenomenon of ebb and flow of sea water, has shown a difference of sedimentation volume from 2011 to 2012 amounted to 40,077 m3. And In the sedimentation volume in 2013 amounted to 14,306 m3 with a formzahl number of 0.722 is used as the reference to an increase in sedimentation volume in 2014 amounted to 35,102 m3 with formzahl number of 0.758. The increasing formzahl numbers which also means an increase in the phenomenon of ebb and flow of sea water which has resulted in a difference of sedimentation volume from 2013 to 2014 amounted to 20,796 m3
DIGITAL RECONSTRUCTION OF SINGOSARI TEMPLE USING STRUCTURE FROM MOTION METHODS
No full textSingosari temple is one of cultural heritage building in Indonesia. This temple is located in Singosari District, Malang Regency, East Java, about 9 kilometers from Malang City to Surabaya. This temple is predicted to be built in 1300s and has been restorated by Dutch colonial government in 1934-1937. Today, there are some incomplete parts at the temple. Due to its history and recent condition, the documentation of this building becomes so important not only for archaeological purposes, but also education and tourism. This research aims to make documentations about this temple by digital 3D model reconstruction. The main data which used in this research are 39 terrestrial images of the temple which were taken with digital camera. Then, the 3D model was reconstructed using Structure from Motion algorithm. In order to make a 3D model with correct dimension, position, and orientation, the georeferencing process was done with aid from control points which have known absolute coordinate obtained from terrestrial surveying. To check the geometric accuracy of 3D model, the accuracy test was carried out by comparing the coordinates from 3D model and length measurement with corresponding real values from terrestrial surveying. The result shows that with only terrestrial images the generated 3D model was still incomplete. Visually the walls can be modeled well. But the top and floor can’t be modeled due to lack coverage from the top. In terms of geometric accuracy, the mean 3D positional error is 0.068 m. And the mean of error in length measurement is 0.057 m
ANALISIS INDEKS VEGETASI MANGROVE MENGGUNAKAN CITRA SATELIT ALOS AVNIR-2 (Studi Kasus: Estuari Perancak, Bali)
No full textHutan mangrove di kawasan Estuari Perancak, Jembrana awalnya memiliki area yang sangat luas. Namun seiring dengan perkembangan penduduk, dan peningkatan kebutuhan masyarakat, mulailah pengubahan lahan hutan mangrove menjadi tambak yang mengambil hampir lebih dari 50% lahan asli mangrove. Dengan perkembangan zaman, terdapat teknologi penginderaan jauh yang dapat mengawasi persebaran mangrove alami dan yang ditanami menggunakan indeks vegetasi. Indeks vegetasi yang dapat digunakan antara lain NDVI, EVI2, dan SAVI. Dalam penelitian ini, indeks vegetasi tersebut dimasukkan dalam citra satelit ALOS AVNIR-2 untuk mengetahui rentan nilai indeks vegetasi mangrove alami dan yang ditanami di Estuari Perancak, Jembrana-Bali. Lokasi penelitian penelitian ini berada di Estuari Perancak, Jembrana, tepatnya di desa Budeng dan desa Perancak. Estuari Perancak secara geografis terletak antara 8o 22’ 30” LS sampai 8o 24’ 18” LS dan 114o 36’ 18” BT sampai 114o 38’ 31,2” BT. Metode analisa indeks vegetasi yang digunakan pada penelitian ini adalah NDVI (Normalized Difference Vegetation Index), EVI2 (Enhanced Vegetation Index-2), dan SAVI (Soil Adjusted Vegetation Index). Hasil penelitian ini menunjukkan bahwa citra ALOS AVNIR-2 mampu digunakan dalam menghasilkan data indeks vegetasi dengan algoritma NDVI, EVI2, dan SAVI. Indeks Vegetasi EVI2 menghasilkan keakurasian hubungan yang lebih baik dibandingkan metode NDVI dan SAVI dimana koefisien determinasinya adalah 0,001. Sedangkan yang memiliki keakurasian hubungan yang lebih baik terhadap EVI2 adalah SAVI, dimana koefisien determinannya sebesar 0,987. Total luas area mangrove di Estuari Perancak adalah 114,19 Ha, dengan pembagian mangrove alami seluas 69,04 Ha dan mangrove ditanami seluas 45,15 Ha
MAP ZONE LAND CHANGES TO MONITORING OF CHANGE THE VALUE OF LAND AT DISTRICT RUNGKUT
No full textThe rising of land value is closely related to development process. Middle East Ring Road (MERR) development results in the rapid growth of settlement and other business activities around it. Based on RTRW Surabaya no. 3/2007 about Main Road Network Plan,It wasstated that the land use along MERR II-C will be allocated for trading, service, and public facilities. With so many activities at the site, thelimited land will be fought among users in order to gain maximum benefit. The rapid change in the value / market price of land in the region led to users struggling in keeping updates of land value.Determining the land value or land marketcan be obtained by using Land Value Zone (ZNT) map. ZNT map illustrates areas that has arelatively similar land value. Land value data used in this study is the land market in 2010-2014. The production of land value mapwas by using spatial analysis techniques to create zones or polygon-shaped area that represents the land value in accordance with the real conditions in the field on buying or selling value.ZNT processing results in 6 Village in Rungkut District show a change in the land value; the highest is located in the zone AC and AH in Kalirungkut sub district, while the least changes is in zone FH in Rungkut Kidul sub district. Changes in land value occursin Kalirungkut sub district because of population density and high social activities.While the change in the land value in the Rungkut Kidul sub district is due to the development of education activity, availability of education facility (UPN campus) and accessibility to MERR
COASTLINE CHANGES DETECTION USING SENTINEL-1 SATELLITE IMAGERY IN SURABAYA, EAST JAVA, INDONESIA
No full textOne of the most important linear features on the earth’s surface is coastline. Coastal zone and its environmental management require the information about coastlines and their changes, which display a dynamic nature. The coastal area of Surabaya has the most dominant sedimentation. This is due to the presence of several large rivers flow in the area, which brings sediment to the estuary. In addition, the development of Suramadu bridge that across Madura strait, connecting Java and Madura islands, has opened an opportunity for the areas around the Suramadu Bridge to be the region of industry activities in East Java. It can give sizeable influence for the physical change that happens around the Suramadu Bridge in particular south coastal area of Bangkalan, Madura and north coastal area of Surabaya as the change of coastline and the wide change of land area caused by natural factor or human activities. Sentinel-1 is one of a Sentinels technology which is a polar-orbiting, all-weather, day-and-night radar imaging mission for land and ocean services at C-band. This image is not limited by weather conditions or darkness and effective to separate land and water objects. The availability of Sentinel-1 images that have high spatial resolution and high temporal frequency, facilitate the monitoring of coastline changes. The aim of this paper was to analyze the ability of Sentinel-1 imagery to delineate coastline and their changes. Detection of the coastline changes can be done by choosing the best extracted parameter from Sentinel-1 and by setting threshold for land and water separations. Furthermore, the results of processed images were overlayed based on multi temporal. From this research, it could be expected that sigma-nought from VH polarization is the best parameter for the land and water separations which threshold determination is according to the distribution values of sigma-nought. However, there are no big differences of coastline changes viewed by changes detection in some Sentinel-1 images since the monitoring was carried out every month
ORBIT REDUCTION IN INSAR FOR DEFORMATION OBSERVATIONS MOUNT MERAPI
No full textGround deformation is an important parameter to monitor volcanic activities. It reflects the dynamic processes beneath the surface and should be monitored to understand the volcano status. One technique to monitor ground deformation is Interferometric Synthetic Aperture Radar (InSAR) which works based on radar data that observed whether by airplane or satellite. One important factor in InSAR data processing is orbital effect that appears as a systematic phase in interferogram. The systematic orbital phase can be modelled by mathematical approach especially polynomial equation. This article assesses the utilization of polynomial approach to reduce the orbital phase by using free open source software. As a case study, ALOS-PALSAR data for Merapi Volcano is chosen and it is found that the polynomial function order 2 to 4 is suitable to reduce orbital phase for InSAR estimates after phase unwrapping process
GPS TECHNOLOGY FOR MONITORING SUBSIDENCE IN MERR II-C SURABAYA BRIDGE
No full textMERR II-C bridge or road Middle East Ring Road II-C (MERR II-C) constructed as a support function sizeable transportation and vital to life, especially the area of Surabaya. Based on the results of soil testing in the area around the bridge (source: soil testing data on Soil and Rock Mechanics Laboratory, Department of Civil Engineering, FTSP - ITS, Surabaya), the type of soil surrounding is soft clay. In the soft clay soil, the problem will be found when the need to construct buildings on it are low soil bearing capacity and congestion relatively high ground (Wirawan, 2011).In this study will be an analysis of land subsidence in the area around the bridge MERR II-C, using a GPS to get a reduction in the value of the land around the bridge. Point - the point being observed there are 12 control points scattered in the area around the bridge. Observations were made 3 time is in September, October and November 2015.Output of observations obtained when the point value of land is the biggest decline 23 mm at point 8 and the largest land rise is 4 mm at point 4
3D VISUALIZATION OF CULTURAL HERITAGE USING TERRESTRIAL LASER SCANNER (A Case Study : Monument of Heroes, Surabaya, East Java)
No full textResearch subjects reported was the visualization of three-dimensional (3D) surface models in three-dimensional mapping survey using terrestrial laser scanning (TLS). Tugu Pahlawan (Heroes Monument), located in Surabaya city center near the office of the Governor of East Java was chosen as the research object.Laser technology instruments used for comparison is GeoMax Zoom 300 (Terrestrial Laser Scanner) and Gowin TKS-202 (Electronic Total Station) as well as for geodetic GPS coordinates and altitude reference measurement Heroes Monument are georeferenced. Coordinate measurement results Electronic Total Station and Terrestrial Laser Scanner are then converted into global coordinates (UTM) using georeferencing process from Geodetic GPS measurement results. Coordinates, diameter and height of Tugu Pahlawan calculated for each model. Statistical test is used as data validation terrestrial laser scanner with electronic total station.With 90% confidence interval on statistical tests, 80% of them into confidence intervals. Height of Tugu Pahlawan according to archived data is 41.448 m, in contrast with the results of measurements from Total Station is 41.144 m, while the results of TLS is 41.447 m. Statistical test results concluded that the height of heights TLS is outside the confidence interval. Expected in the future, such as the visualization of 3D surface models can be used for documentation, preservation and reconstruction of cultural heritage