Landslides Hazard Mapping Using Remote Sensing Data in Ponorogo Regency, East Java

Landslides Hazard Mapping Using Remote Sensing Data in Ponorogo Regency, East Java

Mohamad Khoiri;  Lalu Muhamad Jaelani; Amien Widodo

Department of Civil Infrastructure Engineering, Institut Teknologi Sepuluh Nopember
Jl. Raya Menur No. 127, Manyar Sabrangan, Mulyorejo, Surabaya, 60116, INDONESIA
Department of Geomatics Engineering, Institut Teknologi Sepuluh Nopember
Kampus ITS, Keputih, Sukolilo, Surabaya, 60111 INDONESIA
Department of Geophysics Engineering, Institut Teknologi Sepuluh Nopember
Kampus ITS, Keputih, Sukolilo, Surabaya, 60111 INDONESIA

Abstract: East Java, Indonesia is the region with the third most abundant disaster event in Indonesia, with an incidence event of 287 in 2016 which increased to 20% from the incidence in 2015 (287 occurrences). Almost 98% of the disaster in this region was a hydro-meteorological disaster such as a landslide near mountain-slope. To mitigate the losses due to the landslide disaster, it is necessary to map the hazard zone through hazard assessment which includes topographic and geological mapping, soil vulnerability, and rainfall monitoring. This study is the early part of the development of landslide risk reduction methodologies in East Java. Hazard studies were conducted using medium resolution satellite data / Sentinel 2A (for land cover analysis), highresolution Radar data / TerraSAR data (for slope mapping) and geological data (for soil and stone types) as well as precipitation data over area of study. By updating a weighting factor for each parameter based on landslide event over the area of study, the more accurate map could be created using available data. Thus, this landslide-hazard map becomes a part of spatial planning recommendation that should be implemented by the local government.

Keywords: Risk Assessment, landslide, East Java

Full paper: https://ssms.jp/wp-content/uploads/PDF/vol11-issue2/sms17_5131.pdf

Land subsidence analysis in Surabaya urban area using time series InSAR method

Department of Geomatics Engineering, Institut Teknologi Sepuluh Nopember Kampus ITS Sukolilo, Surabaya 60111, Indonesia

Surabaya’s geological condition that dominated by alluvium unconsolidated, as well as increasing growth of buildings-especially skyscrapers-are triggered the surface deformation on the area. This research aims to monitor and analyze the surface deformation, especially the subsidence that occurred in Surabaya urban area over the last two years. We use Remote Sensing Technology that has been widely developed, not only aims to observe and analyze objects on the earth, but also very useful to monitor land surface changes. Interferometric Synthetic Aperture Radar (InSAR) is the first known technique to get surface deformation measurement effectively on large areas (thousands of km2) up to sub-centimeters. However, the technique also has limitations. In order to overcome the limitations of InSAR, multi-temporal InSAR techniques have been recently developed and one of them is Small Baseline Subset (SBAS). This time-series technique tries to overcome the temporal decorrelation due to atmosphere effect and measure transient movement on the Earth surface by using multi-look interferograms combination and small baseline temporal selection. Using SBAS technique we processed 24 Sentinel-1A images from Mei 2015 to Mei 2017 and 28 Sentinel-1A images from May 2015 to September 2017 to extract information of vertical displacement in Surabaya and compare both of them. The result shows that during the observation period, the rate of deformation in the form of Line of Sight Displacement (LOS) is varies from −60mm/year to +20mm/year. The majority of subsidence occured in coastal area (Northern and Eastern part) whereas the majority of uplift occured in the Surabaya downtown area (Southern and Western part).

Full paper https://aip.scitation.org/doi/10.1063/1.5047356

Analysis of Land Cover change Due to Gold Mining in Bombana using Sentinel 1A Radar Data

Analysis of Land Cover change Due to Gold Mining in Bombana using Sentinel 1A Radar Data
Jaelani, L. M., Nurgiantoro, and Putri , R. A.
Dept. of Geomatics Engineering, Faculty of Civil, Environmental and Geo Engineering, Institut Teknologi
Sepuluh Nopember, Surabaya, 60111, Indonesia,
Dept. of Geography, Faculty of Earth Science and Technology, Halu Oleo University, Kendari, 93232,
Indonesia
The discovery of the gold-mine site in Bombana regency since 2008 brings an economic benefit to local society as well as the threat of environmental damage. Environmental damage poses a serious threat considering that mining activities are essentially destructive by altering the landscape and total environmental ecosystem both on land and in coastal waters. To reduce the potential damage to the environment, a regular monitoring of mining areas needs to be performed. In this research, the change of the land cover area in Bombana due to gold mining activity was evaluated using Synthetic Aperture Radar (SAR) data, especially Sentinel-1A data. We processed 10 Sentinel 1A data recorded within 2015 to 2017 that produced high kappa accuracy of 63.6%. During the 3 years monitoring, the open land area gradually increased followed by the increase of the mine-site area and decrease of the vegetation area. The result of the processed data indicated that there was a land cover change in the Bombana area due to gold mining activities. Unfortunately, the absence of sentinel data prior to gold mining activities in Bombana causing land cover changes before and after mining cannot be monitored accurately.

Analysis of Land Cover change Due to Gold Mining in Bombana using Sentinel 1A Radar Data. Available from: https://www.researchgate.net/publication/326126326_Analysis_of_Land_Cover_change_Due_to_Gold_Mining_in_Bombana_using_Sentinel_1A_Radar_Data [accessed Jul 23 2018].

Selamat Datang Mahasiswa Baru Teknik Geomatika (1)

Selamat datang, Mahasiswa Baru Teknik Geomatika ITS dari jalur SNMPTN 2018.

Sebelumnya, saya hanya ingin membuat pengumuman, siapa sajakah 33 orang calon mahasiswa baru Teknik Geomatika yang telah diterima itu. Namun, tidak ada salahnya jika saya memberi beberapa catatan terkait keberhasilan mereka menembus persaingan cukup ketat ( 33 kuota direbut oleh 412 pendaftar, atau  1 Kursi diperebutkan oleh 12,5 pendaftar). Angka ini, cukup menarik bagi saya, setelah bertahun tahun lamanya, angka persaingan di Teknik Geomatika berada di bawah 1:10. Untuk itu saya ucapkan selamat buat anda yang namanya ada di daftar di bawah dan selamat juga bagi Program S1 Teknik Geomatika yang berhasil menjaring lebih banyak peminat dari biasanya. Sebuah prestasi turunan setelah tercapainya Akreditasi A dari BAN PT pada tahun 2017 lalu.

Teknik Geomatika, sebagaimana namanya, jarang yang tahu, begitupun saya yakin, anda bagian dari 33 nama tersebut belum tentu tahu. Ada yang mungkin memilih karena orang tua, teman, atau by feeling saja. Tapi tidak usah khawatir, sayapun dahulu, 19 tahun lalu memilih karena feeling. Kawan kawan saya juga banyak yang merasa tersesat di jalan yang benar. Catatan ketersesatan kami, pernah saya rangkum sini  http://lmjaelani.com/2012/05/desy-diawal-berkenalan-dengannya/ Saat kami masuk ke Teknik Geodesi (sebelum berubah nama pada tahun 2006 menjadi Teknik Geomatika).

Iklan Teknik Geomatika 2017

Berikut nama nama yang telah beruntung bergabung di Departemen Teknik Geomatika tahun 2018:

  1. 4180100830 MOH. FAISAL
  2. 4180152780 AKBAR D FAHLEVI
  3. 4180153868 MARTA BERLIANA
  4. 4180154094 MAULIDA ANNISA UZZULFA
  5. 4180209060 ANOM REIQHAN PANGESTU
  6. 4180224023 NUR ANISAK MUTOHAR
  7. 4180274724 DESY DWI RACHMADANI
  8. 4180283978 KLARISSA ARDILIA PUTRI
  9. 4180286808 DIAH ARDIANI
  10. 4180295031 ILHAM ALFIN AZZUMARDI
  11. 4180300667 MEGA WULANSARI
  12. 4180304807 YUNEISKA KARTIKA SARI
  13. 4180337784 WAHYU TRI OKTAFIANA
  14. 4180342595 SINTYA DWI ARLISA
  15. 4180387546 ALYA CHAIRUNNISA
  16. 4180400272 ELVIRA ROSA MEGARANI
  17. 4180400408 MOHAMMAD ADHITYA ANDHIKA
  18. 4180423332 BALQIS NABILA AZALIA
  19. 4180426686 IVAN FIRMANSYAH
  20. 4180432882 ZULFIKAR BAYU KHRISNAMURTI
  21. 4180435264 AHMAD NURKHOLIS MAJID
  22. 4180437054 INTANICHA MAHAR RIESTU
  23. 4180442867 AGHNAS SYAFA’ATI
  24. 4180459901 NADHIRA SRIKANDI
  25. 4180461815 INDAH CHOIRUNNISA
  26. 4180465204 SHAZA FLANETTA PUTRI
  27. 4180472579 MILAN NAELA
  28. 4180480351 I NYOMAN SURYA MERTA YASA
  29. 4180485648 MUHAMMAD ANIS RAIHAN
  30. 4180489092 DESI MAHARANI IRSYAM
  31. 4180489939 VICKY YOGA IVANSYAH
  32. 4180506112 STANLY ALFALLABI
  33. 4180522396 MOHAMMAD ZAINAL MUTTAQIN

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Sekali lagi saya ucapkan selamat bergabung di keluarga besar Teknik Geomatika ITS. Tidak usah ragu, mari bergandengan tangan untuk terbang bersama.

Petrikor

petrikor

Petrikor

Tahukah kamu,
air hujan pertama yang jatuh ke bumi seringkali membawa kita terbang jauh ke masa lalu?

Ia tak hanya berisi air hujan bercampur kenangan.

Tapi kenangan yang terpercik air hujan.

Aroma tanah yang khas, yang tak tergambarkan dalam gradasi wewangian yang umum kita kenal.

Tahukah kamu,

aroma itu,

yang tambah kuat ketika tanah telah lama sekali merindu hujan itu,

disebut petrikor atau petrichor oleh saudara bule kita di sana.

Petrikor menambah syahdu sekaligus pengikat rindu diantara kita.

#LMJ2019

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