scholarly journals PENENTUAN TINGKAT BAHAYA EROSI DI WILAYAH DAS BEDADUNG KABUPATEN JEMBER

2020 ◽  
Vol 8 (1) ◽  
pp. 1-11
Author(s):  
Idah Andriyani ◽  
Sri Wahyuningsih ◽  
Rosalina Sekar Arumsari
Keyword(s):  
Digital Elevation Model ◽  
Soil Loss ◽  
Universal Soil Loss Equation ◽  
Data Input ◽  
Aster Gdem ◽  
Digital Elevation ◽  
Elevation Model ◽  
Soil Loss Equation

Kondisi perkembangan Daerah Aliran Sungai (DAS) di wilayah Kabupaten Jember untuk saat ini perlu dievaluasi karena kondisinya sudah rusak mulai dari tahun 1999. Hal ini dapat menimbulkan bencana alam di kawasan DAS seperti tanah longsor, erosi dan banjir yang memakan korban jiwa. Tujuan dari penelitian ini adalah mengetahui besarnya tingkat bahaya erosi yang dipengaruhi oleh beberapa nilai parameter erosi menggunakan metode Revised Universal Soil Loss Equation (RUSLE) di DAS Bedadung. Data input yang digunakan pada penelitian ini yaitu curah hujan tahun 2004 - 2014, peta jenis tanah, peta penggunaan lahan RBI tahun 2014, dan data Digital Elevation Model (DEM) dari ASTER-GDEM. Hasil penelitian menunjukkan bahwa nilai parameter erosivitas hujan (R) DAS Bedadung rata-rata 1708,70 MJ.cm/tahun. Parameter erodibilitas tanah (K) didominasi jenis tanah latosol dengan nilai K sebesar 0,26. Parameter panjang dan kemiringan lereng (LS) didominasi kelas datar yaitu dengan besar kemiringan 0-8%. Parameter vegetasi penutupan lahan dan pengelolaan tanah (CP) didominasi sawah irigasi dengan nilai CP sebesar 0,02. Laju erosi DAS Bedadung sebesar 160,57 ton/ha.tahun, laju erosi ini termasuk pada kondisi sedang. Tingkat bahaya erosi pada DAS Bedadung didominasi pada tingkat sangat rendah yaitu besar erosi berkisar 0-15 (ton/ha.tahun) atau 62,20% dari luas wilayahnya.

scholarly journals Analisis Karakteristik dan Potensi Tingkat Erosi Daerah Aliran Sungai Blorong Kabupaten Kendal Tahun 2013 dan 2018 Menggunakan Sistem Informasi Geografis dan Pendekatan Universal Soil Lost Equation (USLE)

2020 ◽  
Vol 3 (2) ◽  
pp. 63-72
Author(s):  
Achmad Zakky Robbany ◽  
Dhea Sarah Setyorini ◽  
Aldino Maulana Riski ◽  
Santhi Widyastuti
Keyword(s):  
Digital Elevation Model ◽  
Soil Loss ◽  
Universal Soil Loss Equation ◽  
Digital Elevation ◽  
Elevation Model ◽  
Soil Loss Equation

Peningkatan penduduk yang pesat mengakibatkan suatu daerah terus berkembang, salah satunya yaitu berada di Daerah Aliran Sungai (DAS) Blorong. DAS Blorong dengan luas area 208,20 km2 merupakan salah satu sub DAS bagian timur dari DAS Bodri-Kuto yang berada di kabupaten Semarang dan kabupaten Kendal. Penelitian memiliki tujuan untuk mengetahui karakteristik dan tingkat erosi di DAS Blorong. Metode yang digunakan untuk menghitung tingkat erosi di DAS Blorong yaitu menggunakan USLE (Universal Soil Loss Equation). Metode USLE yang dilakukan dengan Sistem Informasi Geografis (SIG) dengan mencari faktor-faktor untuk mendapatkan nilai USLE tersebut,  beserta menganalisa karakteristik DAS dari data digital elevation model (DEM), peta tata guna lahan, peta geologi, dan curah hujan (tahun 2013 dan 2018). Pada DAS Blorong ditentukan karaktersitiknya berdasarkan hulu dan hilir dari DAS tersebut. Tingkat erosi yang terdapat pada DAS Blorong ditinjau dari tata guna lahan di DAS tersebut. Tingkat erosi di DAS Blorong pada tahun 2013 hingga 2018 terjadi peningkatan sebesar 10,78%, dari 852,236,26 ton/Ha/tahun menjadi 944.037,79 ton/Ha/tahun. Berdasarkan identifikasi dan perhitungan, menunjukkan bahwa curah hujan dan perubahan lahan pemukiman, agrikultur, dan ladang merupakan penyumbang terbesar erosi. Rekomendasi yang dapat dilakukan untuk meminimalisir potensi erosi adalah berupa upaya konservasi pada wilayah ini.

scholarly journals ALTERNATIVA PARA O CÁLCULO AUTOMÁTICO E ESPACIALIZADO DO FATOR TOPOGRÁFICO DA USLE EM BACIAS HIDROGRÁFICAS

Irriga ◽  
2018 ◽  
Vol 1 (2) ◽  
pp. 6-13
Author(s):  
FRANCISCO EMANOEL FIRMINO GOMES ◽  
George Leite Mamede ◽  
Fernando Bezerra Lopes
Keyword(s):  
Soil Loss ◽  
Shuttle Radar Topography Mission ◽  
Universal Soil Loss Equation ◽  
High Complexity ◽  
Slope Length ◽  
Topographic Factor ◽  
Digital Elevation ◽  
Elevation Model ◽  
E Mail ◽  
Soil Loss Equation

ALTERNATIVA PARA O CÁLCULO AUTOMÁTICO E ESPACIALIZADO DO FATOR TOPOGRÁFICO DA USLE EM BACIAS HIDROGRÁFICAS     FRANCISCO EMANOEL FIRMINO GOMES1; GEORGE LEITE MAMEDE2 E FERNANDO BEZERRA LOPES3   1Departamento de engenharia agrícola/UFC, Doutorando em engenharia agrícola, Fortaleza, CE, Fone:(85)99238-2819, CEP:60440-900, e-mail: [email protected]. 2Instituto de Engenharias e Desenvolvimento Sustentável/ UNILAB, Professor Doutor, Redenção, CE, CEP: 62790-000, e-mail: [email protected] 3Departamento de Engenharia Agrícola, UFC, Professor Doutor, Fortaleza, CE, CEP:60440-900, e-mail: [email protected]     1 RESUMO    Dentre os fatores da Universal Soil Loss Equation (USLE), o fator topográfico é que menos se aproxima da realidade e, em geral, os modelos apresentam elevada complexidade para sua determinação. Neste estudo, portanto objetivou-se calcular o fator topográfico da USLE de maneira simplificada usando técnicas de Sistema de Informações Geográficas (SIG). Para tanto, foi utilizado dados do Modelo Digital de Elevação - MDE obtido a partir do (SRTM -Shuttle Radar Topography Mission), assim foram calculadas as declividades e os comprimentos de rampas usando processamento dos dados matriciais do MDE, para então estimar o fator topográfico. Os valores de fator topográfico variaram de 0,21 a 9,88 com média de 1,97. As técnicas de sistema de informação geográficas mostraram-se eficientes para o cálculo do fator topográfico a partir do MDE.   Palavras-chave: erosão, topografia de encosta, geoprocessamento.     GOMES, F. E. F.; MAMEDE, G. L.; LOPES, F. B. ALTERNATIVE FOR THE AUTOMATIC AND SPACIALIZATION OF USLE TOPOGRAPHIC FACTOR IN WATERSHEDS     2 ABSTRACT   Among the factors of the Universal Soil Loss Equation (USLE), the topographic factor is that it is less close to reality and, usually, the models used for its determination presents high complexity. In this study, therefore, the main objective was to calculate the topographic factor of the USLE in a simplified way using techniques geographic information system (sig). For that, data from the Digital Elevation Model – DEM was used, derived from the SRTM (Shuttle Radar Topography Mission), so slopes and slope length were calculated by processing of the DEM matrix data, so the topographic factor was estimated. The topographic factor values varying from 0.21 to 9.88 with an average of 1.97. The GIS techniques showed efficient for estimating the topographic factor derived from DEM data base.   Keywords: erosion, topography of hillside, geoprocessing.

Quality Assessment of Globally Available Digital Elevation Model (DEM) for Mountainous Region

2021 ◽  
Vol 5 (1) ◽  
pp. 11-21
Author(s):  
Sangay Gyeltshen ◽  
Krisha Kumar Subedi ◽  
Laylo Zaridinova Kamoliddinovna ◽  
Jigme Tenzin
Keyword(s):  
Digital Elevation Model ◽  
Vertical Displacement ◽  
Satellite System ◽  
Topographic Map ◽  
Alos Palsar ◽  
Aster Gdem ◽  
Digital Elevation ◽  
The Government ◽  
Elevation Model ◽  
The Individual

The study assessed the accuracies of globally available Digital Elevation Models (DEM’s) i.e., SRTM v3, ASTER GDEM v2 and ALOS PALSAR DEM with respect to Topo-DEM derived from topographic map of 5m contour interval. 100 ground control points of the elevation data were collected with the help of kinematic hand held GNSS (Global Navigation Satellite System), randomly distributed over the study area. The widely used RMSE statistic, NCC correlation and sub-pixel-based approach were applied to evaluate the erroneous, correlation, horizontal and vertical displacement in terms of pixels for the individual Digital Elevation Model. Following these evaluations, SRTM DEM was found to be highly accurate in terms of RMSE and displacement compared to other DEMs. This study is intended to provide the researchers, GIS specialists and the government agencies dealing with remote sensing and GIS, a basic clue on accuracy of the DEMs so that the best model can be selected for application on various purposes of the similar region.

scholarly journals A new 100-m Digital Elevation Model of the Antarctic Peninsula derived from ASTER Global DEM: methods and accuracy assessment

2012 ◽  
Vol 4 (1) ◽  
pp. 129-142 ◽  
Author(s):  
A. J. Cook ◽  
T. Murray ◽  
A. Luckman ◽  
D. G. Vaughan ◽  
N. E. Barrand
Keyword(s):  
Digital Elevation Model ◽  
Antarctic Peninsula ◽  
Accuracy Assessment ◽  
Correction Method ◽  
Pixel Size ◽  
Aster Gdem ◽  
Digital Elevation ◽  
Vertical Accuracy ◽  
Elevation Model ◽  
The Antarctic

Abstract. A high resolution surface topography Digital Elevation Model (DEM) is required to underpin studies of the complex glacier system on the Antarctic Peninsula. A complete DEM with better than 200 m pixel size and high positional and vertical accuracy would enable mapping of all significant glacial basins and provide a dataset for glacier morphology analyses. No currently available DEM meets these specifications. We present a new 100-m DEM of the Antarctic Peninsula (63–70° S), based on ASTER Global Digital Elevation Model (GDEM) data. The raw GDEM products are of high-quality on the rugged terrain and coastal-regions of the Antarctic Peninsula and have good geospatial accuracy, but they also contain large errors on ice-covered terrain and we seek to minimise these artefacts. Conventional data correction techniques do not work so we have developed a method that significantly improves the dataset, smoothing the erroneous regions and hence creating a DEM with a pixel size of 100 m that will be suitable for many glaciological applications. We evaluate the new DEM using ICESat-derived elevations, and perform horizontal and vertical accuracy assessments based on GPS positions, SPOT-5 DEMs and the Landsat Image Mosaic of Antarctica (LIMA) imagery. The new DEM has a mean elevation difference of −4 m (± 25 m RMSE) from ICESat (compared to −13 m mean and ±97 m RMSE for the original ASTER GDEM), and a horizontal error of less than 2 pixels, although elevation accuracies are lower on mountain peaks and steep-sided slopes. The correction method significantly reduces errors on low relief slopes and therefore the DEM can be regarded as suitable for topographical studies such as measuring the geometry and ice flow properties of glaciers on the Antarctic Peninsula. The DEM is available for download from the NSIDC website: http://nsidc.org/data/nsidc-0516.html (doi:10.5060/D47P8W9D).

scholarly journals The draa Cerro Medanoso (Atacama, Chile) and its importance in the study of desert

2016 ◽  
pp. 25
Author(s):  
José F. Araya Vergara ◽  
Ricardo Vilaró
Keyword(s):  
Digital Elevation Model ◽  
Satellite Imagery ◽  
Morphological Analysis ◽  
Aerial Photos ◽  
Desert Pavement ◽  
Aster Gdem ◽  
Digital Elevation ◽  
The World ◽  
Long Time ◽  
Elevation Model

This work presents a morphological analysis of the Cerro Medanoso draa (Atacama Marginal Desert) and the type of contact with the desert pavements of neighboring glacis and piedmont. This study is based on an analysis of aerial photos, and a digital elevation model. Aster GDEM was used as a basis for the survey. Fieldwork observations covered two principal zones: the nucleus and the envelope. Following fieldwork, analysis of satellite imagery was conducted. It was possible to identify the following phases of formation: construction of a stellate nucleus, merging of the eastern envelope, merging of the southern envelope and merging of a complex western envelope. The southeastern facing envelope is much bigger than the northwestern facing one. Consequently, the construction of the complex draa is asymmetric. The correlation of this megadune with similar star and compound draas to other deserts in the world indicates that the closest analogue exists in Namibia, but without merging signals between the envelope and the nucleus. Star draas observed in other deserts exhibit a lack of this envelope. With reference to the neighboring piedmont, the beginning of its deflation must be necessarily correlative to the initial construction of the nuclear twin star draa. The later deflation could be responsible for the pulses, which formed the envelope. Therefore, the neighboring desert pavement and the draa are correlative landforms, which represent a very long time formation, in an important part of the desert history, as evidenced by the cited and referenced research works.

scholarly journals Evaluation of the Accuracy of Digital Elevation Model Produced from Different Open Source Data

2019 ◽  
Vol 25 (8) ◽  
pp. 100-112
Author(s):  
Raghad Hadi Hasan
Keyword(s):  
Open Source ◽  
Digital Elevation Model ◽  
Thermal Emission ◽  
Shuttle Radar Topography Mission ◽  
Google Earth ◽  
Reference Points ◽  
Aster Gdem ◽  
Digital Elevation ◽  
Elevation Model ◽  
High Level

This study aims to estimate the accuracy of digital elevation models (DEM) which are created with exploitation of open source Google Earth data and comparing with the widely available DEM datasets, Shuttle Radar Topography Mission (SRTM), version 3, and Advanced Spaceborne Thermal Emission and Reflection Radiometer Global Digital Elevation Model (ASTER GDEM), version 2. The GPS technique is used in this study to produce digital elevation raster with a high level of accuracy, as reference raster, compared to the DEM datasets. Baghdad University, Al Jadriya campus, is selected as a study area. Besides, 151 reference points were created within the study area to evaluate the results based on the values of RMS.Furthermore, the Geographic Information System (GIS) was utilized to analyze, imagine and interpolate data in this study. The result of the statistical analysis revealed that RMSE of DEM related to the differences between the reference points and Google Earth, SRTM DEM and ASTER GDEM are 6.9, 5.5 and 4.8, respectively. What is more, a finding of this study shows convergence the level of accuracy for all open sources used in this study.  

scholarly journals Evaluating the Vertical Accuracy of DEM Generated from ZiYuan-3 Stereo Images in Understanding the Tectonic Morphology of the Qianhe Basin, China

2021 ◽  
Vol 13 (6) ◽  
pp. 1203
Author(s):  
Zhiheng Liu ◽  
Ling Han ◽  
Zhaohui Yang ◽  
Hongye Cao ◽  
Fengcheng Guo ◽  
...  
Keyword(s):  
Digital Elevation Model ◽  
Tectonic Uplift ◽  
Mountainous Area ◽  
Stereo Images ◽  
Rapid Acquisition ◽  
Aster Gdem ◽  
Digital Elevation ◽  
Evolutionary Response ◽  
Elevation Difference ◽  
Elevation Model

Currently available high-resolution digital elevation model (DEM) is not particularly useful to geologists for understanding the long-term changes in fluvial landforms induced by tectonic uplift, although DEMs that are generated from satellite stereo images such as the ZiYuan-3 (ZY3) satellite include characteristics with significant coverage and rapid acquisition. Since an ongoing analysis of fluvial systems is lacking, the ZY3 DEM was generated from block adjustment to describe the mountainous area of the Qianhe Basin that have been induced by tectonic uplift. Moreover, we evaluated the overall elevation difference in ZY3 DEM, Shuttle Radar Topography Mission (1″ × 1″) (SRTM1), and Reflection Radiometer Global Digital Elevation Model (ASTER GDEM) by using the Ice Cloud and Land Elevation Satellite/Geoscience Laser Altimeter (ICESat/GLAH14) point cloud and a DEM of 1:50,000 scale. The values of the root mean square error (RMSE) of the elevation difference for ZY3 DEM were 9.31 and 9.71 m, respectively, and are in good agreement with SRTM1. The river long profiles and terrace heights were also extracted to compare the differences in channel steepness and the incision rates with SRTM1 and ASTER GDEM. Our results prove that ZY3 DEM would be a good alternative to SRTM1 in achieving the 1:50,000 scale for DEM products in China, while ASTER GDEM is unsuitable for extracting river longitudinal profiles. In addition, the northern and southern river incision rates were estimated using the ages and heights of river terraces, demonstrating a range from 0.12–0.45 to 0.10–0.33 m/kyr, respectively. Collectively, these findings suggest that ZY3 DEM is capable of estimating tectonic geomorphological features and has the potential for analyzing the continuous evolutionary response of a landscape to changes in climate and tectonics.

scholarly journals Uso de Modelo Digital de Elevação Gerados a partir do ASTER GDEM e SRTM para Caracterização da Rede de Drenagem do Município de Renascença no Sudoeste do Estado do Paraná (Use of Digital Elevation Model Generated from the SRTM and ASTER GDEM for...)

2011 ◽  
Vol 4 (2) ◽  
pp. 365 ◽  
Author(s):  
Julio Caetano Tomazoni ◽  
Elisete Guimarães ◽  
Tayoná Cristina Gomes ◽  
Taisller Guimarães da Silva
Keyword(s):  
Digital Elevation Model ◽  
Digital Elevation Models ◽  
Drainage System ◽  
Drainage Network ◽  
Aster Data ◽  
Aster Gdem ◽  
Drainage Networks ◽  
Digital Elevation ◽  
Elevation Model ◽  
Spot 5

Este trabalho avalia a adequação do uso de modelos digitais de elevação, provenientes da manipulação de dados altimétricos da missão SRTM e do instrumento imageador ASTER, para atualização de mapas da rede de drenagem do município de Renascença PR. Para caracterização da rede de drenagem a partir de dados SRTM e ASTER utilizou-se o software SPRING 5.1.7. A rede hidrográfica, obtida por esses dois métodos foi cruzada com a malha hidrográfica extraída de cartas geográficas do exército e imagens ortorretificadas do satélite SPOT 5. Os resultados demonstram que a rede de drenagem, obtida a partir de dados SRTM e ASTER, não é satisfatória por não determinar a grande maioria dos cursos d’água de primeira e segunda ordens. Já os de terceira, quarta e quinta ordens, que são identificados, na grande maioria estão localizados fora do curso real encontrados pelas cartas do exército e imagens ortorretificadas. Os dados demonstram que a vegetação das matas ciliares são captadas pelo SRTM e ASTER e interferem nas variações de altitude e por conseguinte no mau delineamento das redes de drenagem.Palavras chaves – Rede de drenagem; hidrografia; modelos digitais de elevação; SRTM, ASTER.  Use of Digital Elevation Model Generated from the SRTM and ASTER GDEM for Characterization of Drainage  ABSTRACTThis paper assesses the suitability of using digital elevation models, resulting from manipulation of altimetric mission SRTM and ASTER instrument, to update maps of the drainage network in the municipality of Renaissance PR. To characterize the drainage network from SRTM and ASTER data used the software SPRING 5.1.7. The hydrographic network, obtained by these two methods was crossed with a mesh extracted from hydrographic maps of the army and orthorectified images of the SPOT 5 satellite. The results show that the drainage system, derived from SRTM and ASTER data is not satisfactory because they do not determine the vast majority of streams of first and second orders. Already the third, fourth and fifth orders, which are identified in the vast majority are located outside the actual course of the letters found by the army and orthorectified images. The data show that the riparian vegetation are acquired by SRTM and ASTER and interfere with the variations in altitude and therefore the bad design of drainage networks. Keywords - Drainage network; hydrography; digital elevation models; SRTM; ASTER GDEM.

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