{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,27]],"date-time":"2026-04-27T11:55:41Z","timestamp":1777290941673,"version":"3.51.4"},"reference-count":161,"publisher":"MDPI AG","issue":"8","license":[{"start":{"date-parts":[[2020,4,18]],"date-time":"2020-04-18T00:00:00Z","timestamp":1587168000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100004955","name":"\u00d6sterreichische Forschungsf\u00f6rderungsgesellschaft","doi-asserted-by":"publisher","award":["859792"],"award-info":[{"award-number":["859792"]}],"id":[{"id":"10.13039\/501100004955","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>We studied the applicability of point clouds derived from tri-stereo satellite imagery for semantic segmentation for generalized sparse convolutional neural networks by the example of an Austrian study area. We examined, in particular, if the distorted geometric information, in addition to color, influences the performance of segmenting clutter, roads, buildings, trees, and vehicles. In this regard, we trained a fully convolutional neural network that uses generalized sparse convolution one time solely on 3D geometric information (i.e., 3D point cloud derived by dense image matching), and twice on 3D geometric as well as color information. In the first experiment, we did not use class weights, whereas in the second we did. We compared the results with a fully convolutional neural network that was trained on a 2D orthophoto, and a decision tree that was once trained on hand-crafted 3D geometric features, and once trained on hand-crafted 3D geometric as well as color features. The decision tree using hand-crafted features has been successfully applied to aerial laser scanning data in the literature. Hence, we compared our main interest of study, a representation learning technique, with another representation learning technique, and a non-representation learning technique. Our study area is located in Waldviertel, a region in Lower Austria. The territory is a hilly region covered mainly by forests, agriculture, and grasslands. Our classes of interest are heavily unbalanced. However, we did not use any data augmentation techniques to counter overfitting. For our study area, we reported that geometric and color information only improves the performance of the Generalized Sparse Convolutional Neural Network (GSCNN) on the dominant class, which leads to a higher overall performance in our case. We also found that training the network with median class weighting partially reverts the effects of adding color. The network also started to learn the classes with lower occurrences. The fully convolutional neural network that was trained on the 2D orthophoto generally outperforms the other two with a kappa score of over 90% and an average per class accuracy of 61%. However, the decision tree trained on colors and hand-crafted geometric features has a 2% higher accuracy for roads.<\/jats:p>","DOI":"10.3390\/rs12081289","type":"journal-article","created":{"date-parts":[[2020,4,21]],"date-time":"2020-04-21T04:49:38Z","timestamp":1587444578000},"page":"1289","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":13,"title":["Generalized Sparse Convolutional Neural Networks for Semantic Segmentation of Point Clouds Derived from Tri-Stereo Satellite Imagery"],"prefix":"10.3390","volume":"12","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7785-2090","authenticated-orcid":false,"given":"Stefan","family":"Bachhofner","sequence":"first","affiliation":[{"name":"Research Institute for Computational Methods, Vienna University of Economics and Business, Welthandelsplatz 1, 1020 Vienna, Austria"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8995-289X","authenticated-orcid":false,"given":"Ana-Maria","family":"Loghin","sequence":"additional","affiliation":[{"name":"Department of Geodesy and Geoinformation, Vienna University of Technology, Gu\u00dfhausstra\u00dfe 27-29, 1040 Vienna, Austria"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4203-8376","authenticated-orcid":false,"given":"Johannes","family":"Otepka","sequence":"additional","affiliation":[{"name":"Department of Geodesy and Geoinformation, Vienna University of Technology, Gu\u00dfhausstra\u00dfe 27-29, 1040 Vienna, Austria"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2348-7929","authenticated-orcid":false,"given":"Norbert","family":"Pfeifer","sequence":"additional","affiliation":[{"name":"Department of Geodesy and Geoinformation, Vienna University of Technology, Gu\u00dfhausstra\u00dfe 27-29, 1040 Vienna, Austria"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Michael","family":"Hornacek","sequence":"additional","affiliation":[{"name":"Corporate Technology, Siemens AG \u00d6sterreich, Siemensstra\u00dfe 90, 1210 Vienna, Austria"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2908-5813","authenticated-orcid":false,"given":"Andrea","family":"Siposova","sequence":"additional","affiliation":[{"name":"Research Institute for Computational Methods, Vienna University of Economics and Business, Welthandelsplatz 1, 1020 Vienna, Austria"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Niklas","family":"Schmidinger","sequence":"additional","affiliation":[{"name":"Research Institute for Computational Methods, Vienna University of Economics and Business, Welthandelsplatz 1, 1020 Vienna, Austria"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4198-9911","authenticated-orcid":false,"given":"Kurt","family":"Hornik","sequence":"additional","affiliation":[{"name":"Research Institute for Computational Methods, Vienna University of Economics and Business, Welthandelsplatz 1, 1020 Vienna, Austria"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Nikolaus","family":"Schiller","sequence":"additional","affiliation":[{"name":"Vermessung Schmid ZT GmbH, B\u00fcropark Donau, Inkustra\u00dfe 1-7, Stiege 3, EG, 3400 Klosterneuburg, Austria"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Olaf","family":"K\u00e4hler","sequence":"additional","affiliation":[{"name":"Corporate Technology, Siemens AG \u00d6sterreich, Siemensstra\u00dfe 90, 1210 Vienna, Austria"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7120-8939","authenticated-orcid":false,"given":"Ronald","family":"Hochreiter","sequence":"additional","affiliation":[{"name":"Department of Business and Management, Webster Vienna Private University, Praterstra\u00dfe 23, 1020 Vienna, Austria"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2020,4,18]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"436","DOI":"10.1038\/nature14539","article-title":"Deep learning","volume":"521","author":"LeCun","year":"2015","journal-title":"Nature"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"85","DOI":"10.1016\/j.neunet.2014.09.003","article-title":"Deep learning in neural networks: An overview","volume":"61","author":"Schmidhuber","year":"2015","journal-title":"Neural 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