Unsupervised extraction of urban features from airborne lidar data by using self-organizing maps

ŞEN A., SÜLEYMANOĞLU B., SOYCAN M.

SURVEY REVIEW, cilt.52, sa.371, ss.150-158, 2020 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 52 Sayı: 371
  • Basım Tarihi: 2020
  • Doi Numarası: 10.1080/00396265.2018.1532704
  • Dergi Adı: SURVEY REVIEW
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Environment Index, Geobase, INSPEC
  • Sayfa Sayıları: ss.150-158
  • Anahtar Kelimeler: Lidar, SOM, Extraction, Adaptive TIN, Filtering, Weighting, POINT CLOUDS, CLASSIFICATION, ALGORITHMS, MODELS, FILTER
  • Yıldız Teknik Üniversitesi Adresli: Evet

Özet

The extraction of artificial and natural features using light detection and ranging (Lidar) data is a fundamental task in many fields of research for environmental science. In this study, the possibility of using self-organising maps (SOM), which is an unsupervised artificial neural network classification method to extract the bare earth surface and features from airborne Lidar data, was investigated for two different urban areas. The effect of the enlargement of the study area was analysed using the proposed approach. The appropriate weights of SOM inputs, which are 3D coordinates and intensity, obtained from a Lidar point cloud were determined by using Pearson's chi-squared independence test. The weighted SOM feature extraction performance was better than that of the unweighted SOM. The filtering results of SOM to separate ground and non-ground data were also compared with those obtained by the adaptive TIN filtering algorithm. Most of the non-ground features could be removed by the weighted SOM.