Sains Malaysiana 46(11)(2017): 2119-2124

http://dx.doi.org/10.17576/jsm-2017-4611-12

Steep Slope DEM Model Construction based on the Unmanned Aerial Vehicle (UAV) Images(Pembinaan Model DEM Cerun Curam berdasarkan Imej Kenderaan Udara Awasan Automatik (UAV))

WENFEI XI^1* & DONGSHENG LI²

¹College of Tourism and Geographic Sciences, Yunnan Normal University, Kunming 650050

China

²Kunming Metallurgy College, Kunming 650033, China

Diserahkan: 27 Januari 2017/Diterima: 18 Mei 2017

ABSTRACT

The DEM construction of high and steep slope has great importance to slope disaster monitoring. The conventional method used to construct high and steep slope DEM model requires larger field surveying workload. First of all, the high and steep slope image was obtained through unmanned aerial vehicle (UAV) platform; Then the SIFT algorithm is used to extract the feature points which are going to be matched accurately by using RANSAC algorithm. Finally, stereo pair splicing method is used to generate orthogonal images and construct DEM model. After comparing the DEM model with actual slope measurement result collected by total station finding, it is shown that elevation error between the DEM model constructed by unmanned aerial vehicle (UAV) and actual measurement is minimal and its efficiency is proven.

Keywords: DEM model; high and steep slope; orthogonal image; SIFT algorithm; unmanned aerial vehicle (UAV)

ABSTRAK

Pembinaan DEM di cerun tinggi dan curam adalah penting kepada pemantauan bencana cerun. Kaedah konvensional yang digunakan untuk membina model DEM cerun tinggi dan curam memerlukan beban kerja pengukuran lapangan lebih besar. Pertama, imej cerun yang tinggi dan curam diambil melalui platform kenderaan udara awasan automatik (UAV); kemudian, algoritma SIFT digunakan untuk mendapatkan ciri butiran yang akan dipadankan dengan tepat menggunakan algoritma RANSAC. Akhir sekali, kaedah penyambatan pasangan stereo digunakan untuk menjana imej ortogonal dan membina model DEM. Selepas membandingkan keputusan model DEM dengan pengukuran cerun sebenar yang dikumpul melalui jumlah stesen, ditunjukkan bahawa ralat penaikan antara model DEM yang dibina oleh kenderaan udara awasan automatik (UAV) dan pengukuran sebenar adalah minimum dan kecekapannya telah dibuktikan.

Kata kunci: Algoritma SIFT; cerun tinggi dan curam; kenderaan udara awasan automatik (UAV); imej ortogon; model DEM

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*Pengarang untuk surat-menyurat; email: xiwenfei911@163.com