National Coordinating Agency for Surveys and Mapping

Cibinong, Indonesia

National Coordinating Agency for Surveys and Mapping

Cibinong, Indonesia
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Falck C.,German Research Center for Geosciences | Ramatschi M.,German Research Center for Geosciences | Subarya C.,National Coordinating Agency for Surveys and Mapping | Bartsch M.,German Research Center for Geosciences | And 3 more authors.
Natural Hazards and Earth System Science | Year: 2010

GPS (Global Positioning System) technology is widely used for positioning applications. Many of them have high requirements with respect to precision, reliability or fast product delivery, but usually not all at the same time as it is the case for early warning applications. The tasks for the GPS-based components within the GITEWS project (German Indonesian Tsunami Early Warning System, Rudloff et al., 2009) are to support the determination of sea levels (measured onshore and offshore) and to detect co-seismic land mass displacements with the lowest possible latency (design goal: first reliable results after 5 min). The completed system was designed to fulfil these tasks in near real-time, rather than for scientific research requirements. The obtained data products (movements of GPS antennas) are supporting the warning process in different ways. The measurements from GPS instruments on buoys allow the earliest possible detection or confirmation of tsunami waves on the ocean. Onshore GPS measurements are made collocated with tide gauges or seismological stations and give information about co-seismic land mass movements as recorded, e.g., during the great Sumatra-Andaman earthquake of 2004 (Subarya et al., 2006). This information is important to separate tsunami-caused sea height movements from apparent sea height changes at tide gauge locations (sensor station movement) and also as additional information about earthquakes' mechanisms, as this is an essential information to predict a tsunami (Sobolev et al., 2007). This article gives an end-to-end overview of the GITEWS GPS-component system, from the GPS sensors (GPS receiver with GPS antenna and auxiliary systems, either onshore or offshore) to the early warning centre displays. We describe how the GPS sensors have been installed, how they are operated and the methods used to collect, transfer and process the GPS data in near real-time. This includes the sensor system design, the communication system layout with real-time data streaming, the data processing strategy and the final products of the GPS-based early warning system components.


Ambarwulan W.,University of Twente | Ambarwulan W.,National Coordinating Agency for Surveys and Mapping | Salama M.S.,University of Twente | Mannaerts C.M.,University of Twente | Verhoef W.,University of Twente
Hydrobiologia | Year: 2011

Specific inherent optical properties (SIOP) of the Berau coastal waters were derived from in situ measurements and inversion of an ocean color model. Field measurements of water-leaving reflectance, total suspended matter (TSM), and chlorophyll a (Chl a) concentrations were carried out during the 2007 dry season. The highest values for SIOP were found in the turbid waters, decreasing in value when moving toward offshore waters. The specific backscattering coefficient of TSM varied by an order of magnitude and ranged from 0.003 m2 g-1, for clear open ocean waters, to 0.020 m2 g-1, for turbid waters. On the other hand, the specific absorption coefficient of Chl a was relatively constant over the whole study area and ranged from 0.022 m2 mg-1, for the turbid shallow estuary waters, to 0.027 m2 mg-1, for deeper shelf edge ocean waters. The spectral slope of colored dissolved organic matter light absorption was also derived with values ranging from 0.015 to 0.011 nm-1. These original derived values of SIOP in the Berau estuary form a corner stone for future estimation of TSMand Chl a concentration from remote sensing data in tropical equatorial waters. © The Author(s) 2010.


Ramdani D.,National Coordinating Agency for Surveys and Mapping
31st Asian Conference on Remote Sensing 2010, ACRS 2010 | Year: 2010

The use of GPS is increase in the last past year in all aspect of live. The disadvantage of using GPS is the height information not the actual height. To convert it to actual height is needed geoid undulation. In 2008 Adolfientje Kasenda has provided the Gravity data using airborne gravimetric. The survey used the GPS kinematic positioning to determine the coordinate in the plane which use for the position of the gravity data. The position of the gravity data was calculated from these GPS kinematic positioning with used of Bernese 5.0 GPS software. The program that used to calculate the coordinate is CODSPP and GPSEST with use zero difference. In CODSPP it had a RMS from 0.000 to 8.096 in X component, from 0.000 to 9.589 in Y component and from 0.000 to 5.317 in Z component. And in GPSEST it had a RMS from -1.874 to 0.994 in X component, from -2.104 to 5.906 in Y component and from 0.049 to 5.464 in Z component. Seen from the value of RMS of the coordinate from both program - The result of both program can be used as the coordinate of the airborne gravity point. GPSEST gives more accurate than CODSPP.


Wijanarto A.,National Coordinating Agency for Surveys and Mapping | Amhar F.,National Coordinating Agency for Surveys and Mapping
International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences - ISPRS Archives | Year: 2010

Hyperspectral remote sensing is increasingly used for many applications, and one of them is biodiversity mapping. common used data are MODIS and other low resolution satellite images, which have been freely accessed and obtained, while the use of medium resolution hyperspectral images was rare, until mid 2009 when EO-1 Hyperion was declared free. This has motivated some studies to make first step,of ambitious project: Tropical biodiversity mapping. As tropical country with rich biota, biodiversity mapping is very important in Indonesia. a terrestrial spectrometry completed the data for deeper analysis. A biodiversity map will be derived from EO-1 Hyperion data over Bogor Botanical Garden. The area covers about one kilometer square. The study shows that there is a need for building better tropical spectral library.


Ambarwulan W.,University of Twente | Ambarwulan W.,National Coordinating Agency for Surveys and Mapping | Mannaerts C.M.,University of Twente | van der Woerd H.J.,University of Amsterdam | Salama M.S.,University of Twente
Geocarto International | Year: 2010

This article investigates the performance of MERIS reduced resolution data to monitor water quality parameters in the Berau estuary waters, Indonesia. Total suspended matter (TSM), Chlorophyll-a (Chl-a) concentration and diffuse attenuation coefficient (K d) were derived from MERIS data using three different algorithms for coastal waters: standard global processor (MERIS L2), C2R and FUB. The outcomes were compared to in situ measurements collected in 2007. MERIS data processed with C2R gave the best retrieval of Chl-a, while MERIS L2 performed the best for TSM retrieval, but large deviations from in situ data were observed, pointing at inversion problems over these tropical waters for all standard processors. Nevertheless, MERIS can be of use for monitoring equatorial coastal waters like the Berau estuary and reef system. Applying a K d(490) local algorithm to the MERIS RR data over the study area showed a sufficient good correlation to the in situ measurements (R 2 1/4 0.77). © 2010 Taylor & Francis.


Prawirodirdjo L.,University of California at San Diego | McCaffrey R.,Rensselaer Polytechnic Institute | Chadwell C.D.,University of California at San Diego | Bock Y.,University of California at San Diego | Subarya C.,National Coordinating Agency for Surveys and Mapping
Journal of Geophysical Research: Solid Earth | Year: 2010

We use survey mode and continuous GPS data from 1991 to 2007 to examine fault segmentation in the earthquake cycle at the Sumatra megathrust, site of the 26 December 2004 Mw 9.1 Sumatra-Andaman, the 28 March 2005 M w 8.7 Nias-Simeulue, and the 12 September 2007 Mw 8.4 Mentawai earthquakes. These data, including new observations from 2006 and 2007, allow us to observe the final few years of one earthquake cycle and the beginning of the next. Our analysis reveals that the megathrust is segmented, a characteristic that may persist through multiple earthquake cycles. The Nias-Simeulue earthquake ruptured approximately the same region that broke in 1861, a 300 km long segment abutting the Sumatra-Andaman rupture zone. Farther southeast, the Mentawai segment of the megathrust (0.5°S-5°S), which produced M > 8 earthquakes in 1797 and 1833, is fully locked in the interseismic period but is flanked by two freely slipping regions, the Batu Islands in the NW and Enggano in the SE. The 12 September 2007 Mentawai earthquake sequence ruptured only the southern one third of the 1833 rupture zone. We model postseismic deformation from the Sumatra-Andaman and Nias-Simeulue earthquakes and find that afterslip was concentrated updip and downdip, respectively, from the main shocks. Comparing the velocity fields before and after 2001, we find the subduction zone underneath the Batu Islands and Enggano, which, prior to the earthquakes, was partially to fully coupled, appears now to be slipping freely. Thus, while the segmentation of the subduction zone is preserved, interseismic coupling on the subduction fault may vary with time. Copyright 2010 by the American Geophysical Union.


Mulyana A.K.,National Coordinating Agency For Surveys and Mapping | Rizaldy A.,National Coordinating Agency For Surveys and Mapping | Uesugi K.,4th Office
International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences - ISPRS Archives | Year: 2012

Pasco Corporation (Japan) has been implementing a project in Indonesia for Sumatra Island which is named Data Acquisition and Production on the National Geo-Spatial Data Infrastructure (NSDI) Development. Digital aerial images in 25cm GSD for 1:10, 000 scale mapping have been taken as a part of the project. The owner of the project, The National Coordinating Agency for Surveys and Mapping (Bakosurtanal) planned to apply conventional aerial triangulation method as the initial stage. Pasco recommended Direct Geo-Reference Methodology by using GPS-IMU measurements and carried out a verification work in a city area. Measurements of tie points were implemented by using KLT/ATLAS software manually and adjusted by BINGO software. Aerial triangulation accuracy verifications were done by using one height control in the block center, one GCP in the center and four GCPs at the corners and one in the center. The results are sequentially, rms X, Y= 0.410cm, rms Z= 0.394cm (one height control point), rms X, Y= 0.430cm, rms Z= 0.392cm (one GCP) and rms X, Y= 0.356cm, rms Z= 0.395cm (5 GCPs). 5 GCPs for each block in official applications have been preferred for safety reasons. Comparisons of direct geo-referencing results with geodetic check points and aerial triangulation block adjustments have been done. The details of the work have been given in this study.


Ambarwulan W.,University of Twente | Ambarwulan W.,National Coordinating Agency for Surveys and Mapping | Verhoef W.,University of Twente | Mannaerts C.M.,University of Twente | Salama M.S.,University of Twente
International Journal of Remote Sensing | Year: 2012

This study presents the application of a semi-empirical approach, based on the Kubelka-Munk (K-M) model, to retrieve the total suspended matter (TSM) concentration of water bodies from ocean colour remote sensing. This approach is validated with in situ data sets compiled from the tropical waters of Berau estuary, Indonesia. Compared to a purely empirical approach, the K-M model provides better results in the retrieval of TSM concentration on both data sets (in situ and Medium Resolution Imaging Spectrometer (MERIS)). In this study, the K-M model was calibrated with in situ measurements of remote-sensing reflectance (R rs) and TSM concentration. Next, the inverse K-M model was successfully applied to images taken by the MERIS instrument by generating regional maps of TSM concentration. MERIS top-of-atmosphere radiances were atmospherically corrected using the Moderate Spectral Resolution Atmospheric Transmittance (MODTRAN) radiative transfer model. The best correlation between R rs measured in situ and R rs MERIS was found to be at a wavelength of 620 nm. The TSM concentrations retrieved using the K-M model showed a lower root mean square error (RMSE), a higher coefficient of determination and a smaller relative error than those retrieved by the purely empirical approach. © 2012 Copyright Taylor and Francis Group, LLC.


Ambarwulan W.,National Coordinating Agency for Surveys and Mapping | Mannaerts C.M.,National Coordinating Agency for Surveys and Mapping | Van Der Woerd H.J.,University of Twente | Salama Mhd.S.,National Coordinating Agency for Surveys and Mapping
34th International Symposium on Remote Sensing of Environment - The GEOSS Era: Towards Operational Environmental Monitoring | Year: 2011

This paper investigates the performance of MERIS reduced resolution data to monitor water quality parameters in the Berau estuary waters, Indonesia. Total Suspended Matter (TSM) and Chlorophyll-a (Chl-a) concentration were derived from MERIS data using three different algorithms for coastal waters: standard global processor (MERIS L2), C2R and FUB. The outcomes were compared to in situ measurements collected in 2007. MERIS data processed with C2R gave the best retrieval of Chl-a, while MERIS L2 performed *the best for TSM retrieval, but large deviations from in situ data were observed, pointing at inversion problems over these tropical waters for all standard processors. Nevertheless, MERIS can be of use for monitoring equatorial coastal waters like the Berau estuary and reef system.


Hartini S.,National Coordinating Agency for Surveys and Mapping | Saputro G.B.,National Coordinating Agency for Surveys and Mapping | Yulianto M.,National Coordinating Agency for Surveys and Mapping | Suprajaka,National Coordinating Agency for Surveys and Mapping
International Conference on Electric Power Systems, High voltages, Electric machines, International conference on Remote sensing - Proceedings | Year: 2010

Mangroves is one of important coastal resources in terms of its economical and ecological functions. Those functions have been discussed widely by many experts, so that mangroves data and their changes overtime is highly demanded particularly by planners and decision makers concerning on coastal resources and developments. To fulfill their needs, accurate mapping of mangroves stands and its changes overtime need to be done. Advancement of remote sensing techniques provides great opportunities for mangroves mapping despite its weaknesses. Moreover, mangroves stands are relatively easy to be identified since this type of vegetation is very distinctive compare to other coastal covers, so that it can be easily recognized and delineated from most of satellite imageries. The problems arise when mapping mangroves should be carried out nationally in vast area like Indonesia. Problems span from technical, financial into management of the data. This paper will discussed the opportunities and challenges in applying remote sensing techniques for mangrove mapping in Indonesia based on experience by the Center for Marine Resources Survey, The National Coordinating Agency for Surveys and Mapping (BAKOSURTANAL) in mapping mangroves Indonesia in 2009.

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