Den nya mätningstekniken på marknaden kallas terrester laserskanning. Tekniken bygger på att ett instrument, monterat på ett stativ, sänder ut en laserstråle vilken avlänkas i vertikalled av en spegel samtidigt som det roterar. Laserstrålen reflekteras mot de objekt som befinner sig inom laserskannerns synfält och resulterar i ett punktmoln. Punktmolnet innehåller ofta flera miljoner punkter vilka alla erhåller xyz-koordinater. Tekniken har visat sig lämplig vid dokumentation av byggnader och vid modellering samt kartläggning av industrier och tunnelbyggen. Denna studie har genomförts på Sweco VBB i Karlstad i syfte att ta reda på hur lämplig terrester laserskanning är vid vardaglig inmätning och kartering av objekt i stadsmiljö. Metoden har jämförts med traditionell inmätning med totalstation utifrån ett antal frågeställningar. I studien laserskannades två korsningar i Vasastaden, Stockholm. Instrumentet som användes var en IMAGER 5006 av märket Zoller+Fröhlich. De totalt sex stycken skanningarna resulterade i punktmoln vilka georefererades genom att måltavlor mättes in med totalstation. Efterbearbetningen bestod av registrering, redigering och reducering av punktmolnen. Genom manuell tolkning av punktmolnen och med hjälp av verktyget Virtual Surveyor i Leica Geosystems programvara Cyclone, kunde olika objekt mätas in och kartläggning av de båda korsningarna ske. En generell jämförelse mellan terrester laserskanning och totalstation visar att laserskanning är en snabb metod som ger stora mängder data med hög detaljrikedom, medger en större säkerhet i fält och ger enorma möjligheter för visualisering, modellering och skapande av terrängmodeller. Laserskanning är dock en dyr metod som ger en något sämre noggrannhet och som ännu inte klarar att mäta sträckor över hundra meter. Metoden kräver också totalstation (eller GPS) för georeferering. Studien har också visat att tidsvinsten som uppkommer i fält förloras genom tidsödande efterbearbetning och manuell tolkning av punktmolnet. Trots detta använder idag ett flertal företag denna metod vid inmätning. Slutsatserna pekar främst på att laserskanning som inmätningsmetod lämpar sig bäst över små områden där antalet objekt är högt och där säkerheten i fält är viktig. Dock ses metoden mer som ett komplement till totalstationen genom de möjligheter som erbjuds via visualisering och modellering och därmed inte en ersättare för den senare. / A new technique for surveying is the terrestrial laser scanning. The technique is based on an instrument, mounted on a tripod, emitting a laser pulse which is vertically deflected by a mirror while rotating. The laser pulse is reflected by the objects within the field of view of the laser scanner. The laser scan results in a point cloud most often containing several millions of points which all have XYZ-coordinates. The technique has proven its benefits when documenting buildings, modelling and surveying of industries and tunnels. This study has been carried out at Sweco VBB in Karlstad in purpose of finding out how suitable terrestrial laser scanning is for everyday surveying in urban environment. The method has been compared with traditional surveying with total station from a number of questions. In the study two crossings in Vasastaden, Stockholm, were scanned. The instrument used was an IMAGER 5006 from Zoller+Fröhlich. The 6 scannings resulted in point clouds which were georeferenced by using targets and a total station. The post processing consisted of registering, editing and reducing the point clouds. Through manual interpretation of the point clouds and by using the tool Virtual Surveyor in the program Cyclone by Leica Geosystems it was possible to survey different objects at the crossings. A general comparison between terrestrial laser scanning and total station shows that laser scanning is a rapid method producing large amounts of data with a high level of details, allows higher security in field and gives enormous possibilities for visualisation, modelling and creating of terrain models. However, laser scanning is an expensive method which gives a slightly lower accuracy and yet cannot be used for longer distances. The method also demands total station (or GPS) for georeferencing. The study has also shown that the saving of time in field is lost by time consuming post processing and manual interpretation of the point cloud. Nonetheless this method is used by several companies for everyday surveying. The conclusions advert mostly that laser scanning is best suitable for small areas where the number of objects is high and where security in field is important. Nevertheless, the method should be seen more as a compliment to the total station because of the possibilities offered by visualisation and modelling and therefore not as a replacement for the latter.

A quantificação de recursos florestais é usada para fins diversos nas ciências naturais, e depende da obtenção de dados de campo de forma precisa e rápida, e o inventário florestal tem se valido principalmente de trabalho humano manual para este fim. A tecnologia LiDAR, baseada em sistemas a laser, permite a coleta desses dados por meio da representação tridimensional do ambiente e a geração de informações espacialmente precisas dos objetos que o compõe. O sistema de varredura laser terrestre (terrestrial laser scanning - TLS) aplica essa tecnologia sob abordagem terrestre, e assim pode ser usada na representação 3D de florestas e ambientes naturais. Devido a crescente número de estudos nesse tópico atualmente o sistema TLS é capaz de fornecer métricas florestais básicas com elevada exatidão, como densidade de plantio e diâmetro à altura do peito, além de informações não obtidas pelo inventário florestal padrão, como estimativa da biomassa e índice de área foliar, entre outros. Este trabalho tem por objetivo a avalição da capacidade do sistema TLS em fornecer com exatidão métricas de árvores individuais selecionadas em dois povoamentos florestais localizados no sudeste do Brasil. Árvores de Eucalyptus sp. (n = 6) e Pinus elliottii var. elliottii (n = 5) foram submetidas à varredura e os valores obtidos pelo mapeamento 3D foram comparados com dados medidos em campo manualmente. Os resultados encontrados mostram que o algoritmo empregado na filtragem dos troncos foi eficiente no isolamento dos fustes de árvores individuais até a altura total das árvores amostradas, enquanto que o algoritmo para modelagem do tronco filtrado foi capaz de fornecer medidas de diâmetro até 50% da altura total das amostras. A exatidão das medidas de DAP pelos dados TLS foi de 0,91 cm e 2,77 cm (REQM) para Eucalyptus e Pinus, respectivamente. Os diâmetros ao longo do fuste tiveram mais exatidão no Eucalyptus (REQM = 2,75 cm e r = 0,77) do que no Pinus (REQM = 3,62 cm e r = 0,86), resultados condizentes com os encontrados em literatura. A exatidão da estimativa dos diâmetros diminuiu ao longo do fuste. O autor sugere que a influência de vento forte no momento da varredura pode ter interferido na qualidade das nuvens de pontos em relação a ruídos e na exatidão dos modelos de obtenção de diâmetros. A partir destes resultados conclui-se que, para as características ambientais e parâmetros de varreduras apresentados, o sistema TLS foi capaz de fornecer dados com exatidão aceitável, e mais estudos devem ser conduzidos buscando o entendimento e mitigação de efeitos que podem dificultar a obtenção de dados precisos nos estratos superiores do dossel florestal. / Forest resources assessment is used for diverse purposes on natural sciences, and relies on field data acquisition in fast and precise ways, and forest inventory has been relying mainly on manual human labor for that. LiDAR technology, which is based on a laser system, allows for these data acquisition through 3D representation of surroundings and the generation of espacially precise information about the objetcs within. Terrestrial laser scanning - TLS - applies this technology in a land approach, thus it can be used on the 3D representation of forests and natural scenes. Due to increasing number of studies on this subject nowadays TLS system is capable of giving basic forest metrics with high precision, as for plant density and diameter at breast height, besides information not obtained by standard inventory procedures, as biomass estimation and leaf área index, among others. This work aims the assessment of TLS capability on giving precise metrics of individual trees located at two forest stands in southeastern Brazil. Trees of Eucalyptus sp. (n = 6) and Pinus elliottii var. elliottii (n = 5) were scanned and the numbers obtained by 3D mapping were compared to manually measured field data. The results found show that the algorithms used on trunk filtration were efficient on individual trees stem isolation until total height of measured trees, while the trunk modelling algorithm was capable of giving diameters until 50% of samples total height. The precision of DBH measurements by TLS data was 0,91 cm and 2,77 cm (RMSE) for Eucalyptus and Pinus, respectivelly. Diameters along the stem were more preciselly estimated for Eucalytus trees (RMSE = 2,75 cm and r = 0,77) than for Pinus trees (RMSE = 3,62 cm and r = 0,86), results consistente with literature. The precision of diameters estimation diminished along the stem. The author suggests that the influence of intense wind by the time of scanning can have interfered on cloud point quality in the terms of noises and thus on the precision of diameter estimation modelling. From these results one can conclude that, considering the environmental aspects and scanning parameters presented, TLS system was capable on giving data with acceptable precision, and more studies must be carried searching for understanding and mitigation of effects that can difficult precise data acquisition on upper forest strata.

No description available.

The diploma thesis describes the data integration of data from different 3D technologies, specifically data of close range photogrammetry, aerial photogrammetry using RPAS and terrestrial laser scanning. The thesis deals mainly with fotogrammetric processing in ContextCapture software and data integration in this software. The thesis also describes a construction of a calibration field. The points of the field were used as ground control points and check points during processing. The accuracy of the outputs was evaluated by statistical testing of the coordinate deviations of the control points. The result of the thesis is 3D model of one of the buildings located in the AdMaS research center.

Leaves in forests assimilate carbon from the atmosphere and woody components store the net production of that assimilation. Separate structure measurements of leaves and woody components advance the monitoring and modeling of forest ecosystem functions. This dissertation provides a method to determine, for the first time, the 3-D spatial arrangement and the amount of leafy and woody materials separately in a forest by classification of lidar returns from a new, innovative, lidar scanner, the Dual-Wavelength Echidna® Lidar (DWEL). The DWEL uses two lasers pulsing simultaneously and coaxially at near-infrared (1064 nm) and shortwave-infrared (1548 nm) wavelengths to locate scattering targets in 3-D space, associated with their reflectance at the two wavelengths. The instrument produces 3-D bispectral "clouds" of scattering points that reveal new details of forest structure and open doors to three-dimensional mapping of biophysical and biochemical properties of forests. The three parts of this dissertation concern calibration of bispectral lidar returns; retrieval of height profiles of leafy and woody materials within a forest canopy; and virtual reconstruction of forest trees from multiple scans to estimate their aboveground woody biomass. The test area was a midlatitude forest stand within the Harvard Forest, Petersham, Massachusetts, scanned at five locations in a 1-ha site in leaf-off and leaf-on conditions in 2014. The model for radiometric calibration assigned accurate values of spectral apparent reflectance, a range-independent and instrument-independent property, to scattering points derived from the scans. The classification of leafy and woody points, using both spectral and spatial context information, achieved an overall accuracy of 79±1% and 75±2% for leaf-off and leaf-on scans, respectively. Between-scan variation in leaf profiles was larger than wood profiles in leaf-off seasons but relatively similar to wood profiles in leaf-on seasons, reflecting the changing spatial heterogeneity within the stand over seasons. A 3-D structure-fitting algorithm estimated wood volume by modeling stems and branches from point clouds of five individual trees with cylinders. The algorithm showed the least variance for leaf-off, woody-points-only data, validating the value of separating leafy and woody points to the direct biomass estimates through the structure modeling of individual trees.

Bereits seit Längerem wird das terrestrische Laser Scanning zur Vermessung von über- und unterirdischen Bauwerken eingesetzt. Die Forderung nach einer detaillierten digitalen 3D-Dokumentation erfordert geeignete Methoden, die eine möglichst hohe geometrische Auflösung bei entsprechend effizienten Aufnahmeverfahren ermöglichen. Gerade die Bedingungen unter Tage stellen große Herausforderungen an die Aufnahme: Obwohl viele Scanpositionen aufgenommen werden müssen, spielt der Zeitaufwand für die Abwicklung des gesamten Scanprojekts eine große Rolle. Obwohl keine GNSS (Global Navigation Satellite System)-Messungen möglich sind, sind die Anforderungen an die Robustheit des „Workflows“ und an die Genauigkeit des Gesamtprojekts hoch. Auf der einen Seite sollen große und komplexe 3D-Daten möglichst lückenfrei und komplett aufgenommen, auf der anderen Seite sollen die Ergebnisse dann aber auch möglichst vielen Anwendern flüssig und intuitiv bedienbar zur Verfügung stehen. In vielen Details wurde gerade in den letzten Jahren der gesamte Aufnahme- und Auswerteprozess beschleunigt und verbessert: Die Laserscanner messen mit „Millimeter-Genauigkeit“, es können dutzende hochauflösende Scans pro Stunde aufgenommen werden, die Scanpositionen werden auch ohne GNSS-Information automatisch zueinander registriert und eine Ausgleichsrechnung kann abschließend einen Fehlerreport des gesamten Vermessungsprojektes liefern. Diese Arbeit soll sowohl den gesamten „Vermessungs-Workflow“ beschreiben, als auch eine neue Methode aufzeigen, ein Scanprojekt mehreren Institutionen gleichzeitig zugänglich zu machen. Alle Scans eines Projektes können speicheroptimiert im Intranet oder im Internet als ein sogenanntes „RiPANO“-Projekt gespeichert werden. Die Navigation zwischen einzelnen Scanpositionen erfolgt intuitiv, rasch und übersichtlich. Mehrere Benutzer können dann gleichzeitig darauf zugreifen und die Daten so vorbereiten, dass daraus CAD-(Bestands-)Pläne erstellt werden können. / For some time now, terrestrial laser scanning has been used for surveying above and below ground structures. The demand for detailed digital 3D documentation requires suitable methods that allow the highest possible geometric resolution with correspondingly efficient recording methods. The underground conditions in particular pose great challenges for the recording: although many scan positions have to be recorded, the time required to complete an entire scan project plays an important role. Although no GNSS (global navigation satellite system) measurements are possible, the demands on the robustness of the registration and the accuracy of the overall project are high. On the one hand, large and complex 3D data should be recorded as gap-free and complete as possible, on the other hand, the results should be made available to as many users as possible in a fluent and easy to use way.

No description available.

The mining industry has over the last few decades seen a drastic increase in the usage of laser scanning technologies as a way of creating 3D maps of the mines being exploited. Underground mapping in places such as mines has become more prevalent as the technology has progressed and made it easier to generate highly detailed point clouds faster. A newer and faster method of generating point clouds is using a simultaneous localization and mapping (SLAM) based mobile laser scanner (MLS). With the help of complex algorithms, it enables instant point cloud registration and allows for continuous mapping of the surrounding environment while tracking the device location without needing a connection to GPS. As the accuracy and speed of SLAM based MLS continues to improve, its use is becoming far more widespread within the mining industry. Although studies have been conducted previously investigating the differences in quality between SLAM based MLS and terrestrial laser scanners (TLS), there is still a need for further studies conducted in mining environments. This case study aims to investigate the quality differences between two point clouds generated using an Emesent Hovermap HF1, which is a SLAM based MLS, and a Faro Laser Scanner Focus 3D X 330 TLS. Parameters like root mean square (RMS) were investigated. Volume calculations were carried out for both point clouds and compared to each other as well the calculated volume of a theoretical model. To conduct this study data from LKAB’s Kiruna mine was collected and provided by Blå Projekt, Process & GIS AB. The result of this study concludes that the Faro TLS is superior in terms of point cloud quality, with five times better RMS values and higher point density than the Hovermap MLS. It also shows that both scanners allowed for accurate volume calculations with only roughly 1% difference in the estimated volumes. The TLS method yielded a much more readable point cloud with clearer visual details than the SLAM based MLS method. This may however be a result of SLAM drift since no loop closure was performed when collecting the MLS data which otherwise could’ve minimized the errors. It was concluded that due to the amount of data processing required and the longer work time of TLS, SLAM based MLS is a method that is worth further development as it provides unparalleled flexibility, safety improvements and work time efficiency.

Dams are relatively simple hydraulic structures that provide vital services to communities in the United States (U.S.). However, many of the dams in the (U.S.) have surpassed their design life. Dams experience changes from external threats that result in deformation of the structure. Traditional surveying techniques provide limited information on deformation in pre-determined areas of a structure, but the collection effort can often be lengthy. In this research, different instruments used for change detection were reviewed and Terrestrial Laser Scanning (TLS), also known as ground-based Light Detection and Ranging (LiDAR), was selected as the most probable method to accurately evaluate deformation in dams. TLS is a remote sensing instrument that uses light to form a pulsed laser to measure ranges to variable targets, and it provides the ability to measure displacement with high accuracy using dense point clouds collected in a short amount of time. Deformation is identified by measuring changes in point clouds generated by TLS. The accuracy of TLS to identify deformation was tested on a thin arch dam at the Big Black Test site in Vicksburg, Mississippi, using the TLS system, Terrestrial Laser Scanner RIEGL VZ-400, for data collection and for registering scan positons between a pre-test condition and a post-test condition. Final data analysis was performed using Microstation TopoDOTTM Wall Monitoring Tool.

No / Excavations in the 1920s and 1970s at the Sculptor’s Cave, North-East Scotland, revealed that the site was used for mortuary rituals during the Late Bronze Age (c. 1100–800 BC) and Roman Iron Age (late first to fourth centuries AD), whilst a series of Pictish symbols carved into its entrance walls suggest that the cave’s importance continued into the Early Medieval Period. A new programme of analysis has utilised advanced 3D digital documentation and 3D metrology (specifically, 3D laser scanning) to enable this inaccessible site to be appreciated by wider audiences and analysed remotely. Detailed in situ recording of the Pictish symbols was undertaken using macro-level structured light scanning and the high-fidelity digital models blended with terrestrial laser scan data of the cave interior to show the location and detail of the carvings. This chapter examines the value of emerging digital approaches in the analysis, presentation and management of the Sculptor’s Cave, from the elucidation of additional carved details and the monitoring of surface degradation, to the dissemination of this difficult-to-access site to the wider public via online platforms. / Historic Environment Scotland provided funding for scanning work. Collaborators Visualising Heritage and Fragmented Heritage at the University of Bradford, funded by HEIF (via the University of Bradford) and the Arts and Humanities Research Council (AH/L00688X/1), respectively.