scholarly journals Orthorectification and Digital Elevation Model (DEM) Generation Using Cartosat-1 Satellite Stereo Pair in Himalayan Terrain

2010 ◽  
Vol 02 (02) ◽  
pp. 85-92 ◽  
Author(s):  
Vivek Kumar Singh ◽  
Prashant Kumar Champati Ray ◽  
Ayyeum Perumal Thillai Jeyaseelan
Keyword(s):  
Digital Elevation Model ◽  
Stereo Pair ◽  
Digital Elevation ◽  
Elevation Model

EVALUASI KETELITIAN HASIL ORTHOREKTIFIKASI CITRA SATELIT RESOLUSI TINGGI MENGGUNAKAN DEM STEREO-PAIR PLEIADES

2019 ◽  
Vol 3 ◽  
pp. 11
Author(s):  
Diaz Cahya Kusuma Yuwana ◽  
Maundri Prihanggo ◽  
Agung Syetiawan
Keyword(s):  
Sea Level ◽  
Digital Elevation Model ◽  
Control Point ◽  
Ground Control ◽  
Stereo Pair ◽  
Check Point ◽  
Mean Sea Level ◽  
Rational Polynomial ◽  
Digital Elevation ◽  
Elevation Model

Implementasi proses orthorektifikasi membutuhkan data Digital Elevation Model (DEM) yang akurat. Ketersediaan data DEM yang akurat menjadi permasalahan tersendiri dalam proses orthorektifikasi. DEM hasil proses stereo-pair citra satelit pleiades menjadi sebuah alternatif. Penelitian ini berfokus untuk mengkaji ketelitian geometrik hasil orthorektifikasi dengan masukan DEM hasil stereo-pair (1m) citra satelit plaiades dengan DEM IFSAR (5m). Data yang digunakan meliputi sepasang Citra Satelit Pleiades, data hasil pengukuran GPS sebanyak 23 titik yang nantinya 11 titik dijadikan sebagai Ground Control Point (GCP) dan 12 titik dijadikan sebagai Independent Check Point (ICP), dan data DEM Ifsar 5 meter. Penelitian ini mendasarkan pada perbandingan ketelitian geometrik antara citra hasil othorektifikasi menggunakan masukan DEM IFSAR 5 m dengan masukan DEM dari hasil proses stereo-pair dua pasang citra satelit pleiades. Metode rational polynomial coefficient (RPC) digunakan untuk mendapatkan pembentukan epipolar citra dan citra ortho. DEM hasil stereo-pair citra satelit plaiades memiliki rentang -37 meter sampai dengan 155 meter di atas mean sea level (MSL). DEM hasil stereo-pair jauh lebih detail dari DEM IFSAR, kondisi perumahan dan jalan raya terepresentasikan lebih baik dan lebih jelas. Akurasi pada citra hasil orthorektifikasi menggunkan DEM stereo-pair 1 m adalah 1,04019 lebih baik dari hasil ortho menggunakan DEM IFSAR 5 m yaitu 1,12783. Perbedaan resolusi DEM sebesar 4 meter tidak signifikan mempengaruhi hasil orthorektifikasi citra satelit resolusi tinggi. Secara keseluruhan hasil akhir yang didapat dari kedua citra ortho dengan masukan data DEM tersebut masuk dalam ketelitian peta skala 1:5000 kelas 2 CE90.

STUDY OF THE LANDSLIDE MORPHOLOGY BASED ON GNSS DATA AND AIRBORNE SOUNDING (ON THE EXAMPLE OF A SECTION OF THE PROTVA RIVER VALLEY)

2018 ◽  
Vol 12 (5-6) ◽  
pp. 50-57 ◽  
Author(s):  
I. S. Voskresensky ◽  
A. A. Suchilin ◽  
L. A. Ushakova ◽  
V. M. Shaforostov ◽  
A. L. Entin ◽  
...  
Keyword(s):  
Digital Elevation Model ◽  
Geodetic Network ◽  
Aerial Survey ◽  
River Valley ◽  
Ease Of Use ◽  
Digital Elevation ◽  
Loose Deposits ◽  
Positioning Method ◽  
Landslide Body ◽  
Elevation Model

To use unmanned aerial vehicles (UAVs) for obtaining digital elevation models (DEM) and digital terrain models (DTM) is currently actively practiced in scientific and practical purposes. This technology has many advantages: efficiency, ease of use, and the possibility of application on relatively small area. This allows us to perform qualitative and quantitative studies of the progress of dangerous relief-forming processes and to assess their consequences quickly. In this paper, we describe the process of obtaining a digital elevation model (DEM) of the relief of the slope located on the bank of the Protva River (Satino training site of the Faculty of Geography, Lomonosov Moscow State University). To obtain the digital elevation model, we created a temporary geodetic network. The coordinates of the points were measured by the satellite positioning method using a highprecision mobile complex. The aerial survey was carried out using an unmanned aerial vehicle from a low altitude (about 40–45 m). The processing of survey materials was performed via automatic photogrammetry (Structure-from-Motion method), and the digital elevation model of the landslide surface on the Protva River valley section was created. Remote sensing was supplemented by studying archival materials of aerial photography, as well as field survey conducted immediately after the landslide. The total amount of research results made it possible to establish the causes and character of the landslide process on the study site. According to the geomorphological conditions of formation, the landslide refers to a variety of landslideslides, which are formed when water is saturated with loose deposits. The landslide body was formed with the "collapse" of the blocks of turf and deluvial loams and their "destruction" as they shifted and accumulated at the foot of the slope.

Ranked algorithm to fill sinks in digital elevation model based on quicksort

2009 ◽  
Vol 29 (11) ◽  
pp. 3161-3164
Author(s):  
Bang YANG ◽  
Li-liang REN ◽  
Ying-qing HE
Keyword(s):  
Digital Elevation Model ◽  
Model Based ◽  
Digital Elevation ◽  
Elevation Model
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