20.500.12556/RUL-73254 Vektorizacija poteka daljnovodnih vodnikov s houghovo transformacijo iz podatkov aero- in terestričnega laserskega skeniranja Extraction of power lines from airborne and terrestrial laser scanning data using the hough transform V članku predstavljamo postopek za samodejno prepoznavanje poteka daljnovodnih vodnikov v horizontalni ravnini xy iz podatkov aero- in terestričnega laserskega skeniranja. Postopek sestavljajo štirje glavni koraki: predobdelava s klasifikacijo oblaka točk, filtriranje oblaka točk, prepoznavanje točk na vodnikih s Houghovo transformacijo (HT) in vektorizacija poteka vodnikov ter izračun njihovih presečišč. V predobdelavi s klasifikacijo oblaka točk odstranimo večino točk, ki ne pomenijo vodnikov. Predstavljamo lasten filter, s katerim dodatno zmanjšamo število točk v oblaku, pospešimo izračun in povečamo zanesljivost nadaljnje obdelave podatkov. Točke vodnikov poiščemo z uporabo HT na vektorskih točkah v ravnini xy. Končen potek vodnikov določimo s premicami, izračunanimi po metodi najmanjših kvadratov iz točk, ki jih HT označi kot točke na vodnikih. Rezultate ocenimo vizualno in izdelamo relativno primerjavo koordinat presečišč z referenčnimi presečišči, ki smo jih določili iz ročno filtriranega oblaka točk. S predlaganim postopkom je mogoče prepoznati večino vodnikov na testnem območju v obeh nizih podatkov. n this article, a method for the automatic detection of power lines in a horizontal xy plane from airborne and terrestrial laser scanning data is presented. The workflow is composed of four main steps: pre-processing with classification of a point cloud, filtering of the point cloud, the detection of points on the power lines by applying the Hough transform (HT), and vectorisation of power line locations and their intersections. In the pre-processing step, most of the points that are not representing power lines are eliminated via classification of the point cloud. We present our filter, which reduces the number of points in the point cloud further and thus accelerates data processing and increases the reliability of processing in the next steps. We detect the points on the power lines with the HT on the vector points in the xy plane. The final track of the power lines is derived from the straight segments computed by the method of the least squares from the points that HT recognised on the power lines. The results are assessed visually and via relative comparison of the computed intersections coordinates with the reference data manually extracted from the filtered point cloud. The proposed method detects almost all power lines in the test area for both data sets lasersko skeniranje daljnovodni vodniki Houghova transformacija filtriranje oblaka točk laser scanning powerlines Hough transform filtering of point cloud true false false Zveza geodetov Slovenije Slovenski jezik Angleški jezik Neznano 2015-10-30 05:44:25 2015-10-30 05:44:26 2022-08-01 17:44:33 0000-00-00 00:00:00 2015 0 0 Str. 246-261 št. 2 Letn. 59 2015 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 528.7/.8 0351-0271 10.15292/geodetski-vestnik.2015.02.246-261 7092065 5091842 gv59%2D2_grigillo_k.pdf gv59%2D2_grigillo_k.pdf 1 272C321B334384A2946EA1B0FD2063E5 10bc6f573660b27b2e913b921f1a93181380b7be3df0456a13295a515a6e5186 3cfc062e-a1ae-11eb-a523-00155dcfd717 20.500.12556/rul/99b303a7-13f1-49e6-9464-417598bb723b https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=86313 http://www.geodetski-vestnik.com/59/2/gv59-2_grigillo.pdf 1 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=73292 Fakulteta za gradbeništvo in geodezijo 0 0 0