J. Kaňuk, Jozef Šupinský, J. Šašak, J. Hofierka, Yongbou Wang, Qiuzhao Zhang, V. Sedlák, Katarína Onačillová, M. Gallay
The Smart City concept requires new, fast methods for collection of 3-D data representing features of urban landscape. Laser scanning technology (LiDAR - Light Detection and Ranging) enables such approach producing dense 3-D point clouds of millions of points, which, however, contain noise. Therefore, we developed a new approach allowing for a semi-automatic elimination of data noise resulting from motion of objects within the scanned scene such as persons. We used a connected-component labelling method to filter out the noise points from terrestrial laser scanning point clouds. Our approach was based on a step-by-step object classification with a proper parameterisation. In the first step, all points located close to the predicted terrain were selected. In the second step, the points representing the terrain and floor were classified using the surface filter tool implemented in the RiScan Pro software by RIEGL. The rest of points were classified using point cloud clustering via the connected-component labelling method implemented in the CloudCompare software. In the final step, the operator manually decides whether the point cluster represents the noise. The method was applied to the Cathedral of Saint Elizabeth, a sacral object located in the historical centre of the city of Košice in Slovakia during normal operating hours. We managed to capture approximately 80% of the data noise in total. The method provides a better flexibility in surveying overcrowded city locations using the laser scanning technology.
{"title":"Semi-automatic LiDAR point cloud denoising using a connected-component labelling method","authors":"J. Kaňuk, Jozef Šupinský, J. Šašak, J. Hofierka, Yongbou Wang, Qiuzhao Zhang, V. Sedlák, Katarína Onačillová, M. Gallay","doi":"10.33542/gc2019-2-08","DOIUrl":"https://doi.org/10.33542/gc2019-2-08","url":null,"abstract":"The Smart City concept requires new, fast methods for collection of 3-D data representing features of urban landscape. Laser scanning technology (LiDAR - Light Detection and Ranging) enables such approach producing dense 3-D point clouds of millions of points, which, however, contain noise. Therefore, we developed a new approach allowing for a semi-automatic elimination of data noise resulting from motion of objects within the scanned scene such as persons. We used a connected-component labelling method to filter out the noise points from terrestrial laser scanning point clouds. Our approach was based on a step-by-step object classification with a proper parameterisation. In the first step, all points located close to the predicted terrain were selected. In the second step, the points representing the terrain and floor were classified using the surface filter tool implemented in the RiScan Pro software by RIEGL. The rest of points were classified using point cloud clustering via the connected-component labelling method implemented in the CloudCompare software. In the final step, the operator manually decides whether the point cluster represents the noise. The method was applied to the Cathedral of Saint Elizabeth, a sacral object located in the historical centre of the city of Košice in Slovakia during normal operating hours. We managed to capture approximately 80% of the data noise in total. The method provides a better flexibility in surveying overcrowded city locations using the laser scanning technology.","PeriodicalId":42446,"journal":{"name":"Geographia Cassoviensis","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70423801","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
P. Chrastina, Jakub Trojan, Ladislav Župčán, Tünde Tuska, Pavel P. Hlásnik
The landscape surrounding village Tardoš (Tardos in Hungarian) in the north of Komárom-Esztergom County is a part of the cultural heritage of Slovaks in Hungary. The study anal-yses the issue of the revitalisation of the landscape in the context of its use (historical land use). Current state of the local landscape represents the result of the migration of ethnic groups to the territory of Tardoš and its subsequent colonisation. Since the end of the first quarter of the 18th century the process of revitalisation of the abandoned landscape had been associated with the arrival of the Roman Catholic settlers from the counties located north of the Danube river (Nitra and Trenčín). The new population began to cultivate dev-astated landscape of the Tardoš-Tolna basin in the Gerecse Mountains. The aim of this paper is to characterize the Tardoš land use with an emphasis on the period from 1725 (Slovak colonisation of the defunct village territory) to 2017. A brief assessment of the land use during the period before the arrival of the Slovak colonists is included in the study. Recent changes of areas in the analysed territory are characterized by landscape use clas-ses (LUC) during the last 300 years (1725 ‒ 2017) in the context of natural (geoecological) and social factors. Besides these data a framework proposal for the management of the local landscape is suggested. The development of the historical land use after the arrival of the Slovaks is outlined in the thematic maps, chart with LUC areas in particular periods and in diagram. The methodology used and the results achieved can be applied in the study of the land use of other Slovak enclaves in Tardoš surroundings. Findings concerning the local land use changes with an emphasis on the period after 1725 can be possibly taken into account in social practice of the creation of an integrated landscape management of the surveyed territory or in the process of consolidating the local population identity.
{"title":"Land use ako nástroj revitalizácie krajiny: na príklade slovenskej enklávy Tardoš (Maďarsko)","authors":"P. Chrastina, Jakub Trojan, Ladislav Župčán, Tünde Tuska, Pavel P. Hlásnik","doi":"10.33542/gc2019-2-03","DOIUrl":"https://doi.org/10.33542/gc2019-2-03","url":null,"abstract":"The landscape surrounding village Tardoš (Tardos in Hungarian) in the north of Komárom-Esztergom County is a part of the cultural heritage of Slovaks in Hungary. The study anal-yses the issue of the revitalisation of the landscape in the context of its use (historical land use). Current state of the local landscape represents the result of the migration of ethnic groups to the territory of Tardoš and its subsequent colonisation. Since the end of the first quarter of the 18th century the process of revitalisation of the abandoned landscape had been associated with the arrival of the Roman Catholic settlers from the counties located north of the Danube river (Nitra and Trenčín). The new population began to cultivate dev-astated landscape of the Tardoš-Tolna basin in the Gerecse Mountains. The aim of this paper is to characterize the Tardoš land use with an emphasis on the period from 1725 (Slovak colonisation of the defunct village territory) to 2017. A brief assessment of the land use during the period before the arrival of the Slovak colonists is included in the study. Recent changes of areas in the analysed territory are characterized by landscape use clas-ses (LUC) during the last 300 years (1725 ‒ 2017) in the context of natural (geoecological) and social factors. Besides these data a framework proposal for the management of the local landscape is suggested. The development of the historical land use after the arrival of the Slovaks is outlined in the thematic maps, chart with LUC areas in particular periods and in diagram. The methodology used and the results achieved can be applied in the study of the land use of other Slovak enclaves in Tardoš surroundings. Findings concerning the local land use changes with an emphasis on the period after 1725 can be possibly taken into account in social practice of the creation of an integrated landscape management of the surveyed territory or in the process of consolidating the local population identity.","PeriodicalId":42446,"journal":{"name":"Geographia Cassoviensis","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70423197","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
One of the dominant death causes, which contributes significantly to the mortality of the Slovak population, is cancer mortality. In the presence of cancers, we can find geographical differences i.e. the cancer of different organs has a different frequency of occurrence in different parts of Slovakia. It may be agreed that the fight against cancers, if it is to be complex, must include a spatial aspect and this is best applied in the field of medical geography. The solution of the development of cancer mortality in Slovakia can be considered a relevant topic of geographic research. Data on cancer mortality at the district level were used from the database of the Statistical Office of the Slovak Republic. The aim of the article is to assess the spatial aspect of cancers in the districts of Slovakia applying the standardized mortality rate. The standardized mortality rate will be analysed in terms of gender structure of population. The time horizon for standardized mortality rate comparison was set for the periods of 2001-2008, 2009-2017 and 2001-2017. From the perspective of the research of this topic it is important to apply specific analytical methods which include, for example, spatial autocorrelation.
{"title":"Analýza úmrtnosti na zhubné nádory v regionálnom pohľade Slovenska","authors":"Katarína Vilinová, A. Dubcová","doi":"10.33542/GC2019-1-06","DOIUrl":"https://doi.org/10.33542/GC2019-1-06","url":null,"abstract":"One of the dominant death causes, which contributes significantly to the mortality of the Slovak population, is cancer mortality. In the presence of cancers, we can find geographical differences i.e. the cancer of different organs has a different frequency of occurrence in different parts of Slovakia. It may be agreed that the fight against cancers, if it is to be complex, must include a spatial aspect and this is best applied in the field of medical geography. The solution of the development of cancer mortality in Slovakia can be considered a relevant topic of geographic research. Data on cancer mortality at the district level were used from the database of the Statistical Office of the Slovak Republic. The aim of the article is to assess the spatial aspect of cancers in the districts of Slovakia applying the standardized mortality rate. The standardized mortality rate will be analysed in terms of gender structure of population. The time horizon for standardized mortality rate comparison was set for the periods of 2001-2008, 2009-2017 and 2001-2017. From the perspective of the research of this topic it is important to apply specific analytical methods which include, for example, spatial autocorrelation.","PeriodicalId":42446,"journal":{"name":"Geographia Cassoviensis","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70423241","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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