Quality Test Various Existing Dem in Indonesia  Toward 10 Meter National Dem

Amhar, Fahmi

doi:10.5194/isprs-archives-xli-b4-111-2016

Cited by 3 publications

(2 citation statements)

References 4 publications

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“…The data used include a 1:25,000 topographic digital map of Indonesia and an 8 m resolution DEM (Digital Elevation Model). These data are available openly (open-data) through the Geospatial Information Agency geoportal [35,36].…”

Section: Data Sources and Processingmentioning

confidence: 99%

Spatial-Temporal Changes in Water Supply and Demand in the Citarum Watershed, West Java, Indonesia Using a Geospatial Approach

Nahib¹,

Amhar²,

Wahyudin

et al. 2022

Sustainability

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Balancing water supply demand is vital for sustaining livelihoods. Spatial mapping and calculating water yield dynamics due to land use changes over decades are needed to manage land resources and formulate ecological protection policies. This study mapped the supply, demand, and matching status of water product service using the Integrated Valuation of Ecosystem Service and Tradeoff (InVEST) biophysical models in the Citarum Watershed (CW) in 2000, 2010, and 2020. Moreover, this study used Exploratory Spatial Data Analysis (ESDA) and Geographic Information System (GIS) techniques to study the agglomeration characteristics and evolutionary trajectories of supply–demand over two decades. The results showed that between 2000–2010 and 2010–2020, the water supply decreased by 19.01 × 108 m3 (18.28%) and 12.97 × 108 m3 (15.27%), respectively. However, the water demand in the same period increased by 6.17 × 108 m3 (23%) and 15.74 × 108 m3 (47%), respectively. Over the decades, the contribution of land use land cover (LULC) changes to variations in water supply has yielded values ranging from 2.87% to 6.37%. The analysis of the water supply–demand imbalance indicated that the entire CW experienced water shortage, and the type of spatial matching for supply and demand is dominated by a high supply and high demand class (16.09% of the total area). Based on the level of water deficit calculation, the upstream and downstream areas were identified as zones that require ecological conservation, while the middle CW area requires ecological restoration or ecological improvement.

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Section: Data Sources and Processingmentioning

confidence: 99%

Spatial-Temporal Changes in Water Supply and Demand in the Citarum Watershed, West Java, Indonesia Using a Geospatial Approach

Nahib¹,

Amhar²,

Wahyudin

et al. 2022

Sustainability

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“…High resolution Remote Sensing images such as Pleiades and Worldview have become the minimum standard for large-scale mapping of urban and rural areas (Amhar et al, 2017). However, to obtain 3D topographic contours, stereo optical images such as ALOS prism (Amhar& Mulyana, 2009) or Cartosat (Syafiudin & Amhar, 2009)or processing of interferometric radar results such as TerraSAR-X (Amhar, 2016). Figure 15 shows a pair of Cartosat images processed into a Digtial Elevation Model and an ortho image over Jakarta.…”

Section: Large Scale Topographic Mappingmentioning

confidence: 99%

Islam and Natural Resources Technology

Syah

Amhar

2022

JKPIs

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This paper aims to understand the Islamic view of advanced technology and also presents examples of technology and its application in natural resource management.This paper uses secondary data from reference books, proceedings, national and international journals.The emphasis of the analysis is qualitative descriptive.The results of the analysis showed that Islam is a religion that does not reject the existence of modernity.Even Islam strongly encourages its people to master science and technology.One of these advanced technologies is remote sensing technology.The integration of remote sensing technology and geographic information systems has many benefits and uses for human life, such as for detect potential fish distribution area, mapping habitat benthic in small island, forest landcover change,large scale topographic mapping,and others.Science and technology developed in the order of the Islamic system will provide mercy for the whole world.

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Ownership Protection on Digital Elevation Model (DEM) Using Transform-Based Watermarking

Amhar

Giri

Silalahi³

et al. 2022

IJGI

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This research aims to protect Digital Elevation Model (DEM) data from piracy or counterfeiting. An invisible watermark inserted into the data, which will not considerably change the data value, is necessary. The proposed method involves the use of the two-dimensional discrete cosine transform (2D DCT), a combination of 2D DCT and discrete wavelet transform (DWT), and two-dimensional discrete Fourier transform (2D DFT) in the frequency domain. The data used include a National DEM file downloaded from the geoportal of the Geospatial Information Agency (Badan Informasi Geospasial—BIG). Three files represent mountainous, lowland/urban, and coastal areas. An “attack” is also conducted on the watermarked DEM by cropping. The results indicate that the watermarked DEM is well recognized. The watermark can be read 100% for 2D DCT, while that for 2D DFT can be read 90.50%. The distortion value of the elevation data under the DCT technique demonstrates the smallest maximum value of 0.1 m compared with 4.5 and 1.1 m for 2D DFT and 2D DCT–DWT. Meanwhile, the height difference (Max Delta), the peak signal-to-noise ratio, and the root mean squared error (RMSE) are highest in mountainous, lowland, and coastal areas, respectively. Overall, the 2D DCT is also superior to the 2D DFT and the2D DCT–DWT. Although only one can recognize the nine watermarks inserted on each sheet, DEMs attacked by the cropping process can still be identified. However, this finding can sufficiently confirm that DEMs belong to BIG.

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Quality Test Various Existing Dem in Indonesia Toward 10 Meter National Dem

Cited by 3 publications

References 4 publications

Spatial-Temporal Changes in Water Supply and Demand in the Citarum Watershed, West Java, Indonesia Using a Geospatial Approach

Spatial-Temporal Changes in Water Supply and Demand in the Citarum Watershed, West Java, Indonesia Using a Geospatial Approach

Islam and Natural Resources Technology

Ownership Protection on Digital Elevation Model (DEM) Using Transform-Based Watermarking

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