The first step to ensure the accuracy and reliability of your laser scanning results is to choose the right scanner for your project. Different scanners have different specifications, such as range, resolution, speed, and accuracy. Consider the size, shape, complexity, and location of your target object or scene, as well as the environmental conditions, such as lighting, weather, and interference. You should also compare the scanner's performance with the standards and requirements of your industry or application.
Always choose the right tool, for the right job. The time has passed and today you can do scanning with iPhone and with high end scanning station or TLS. What actually matters is your required outputs. If you need rough measurements for your apartment reconstruction, your iPhone will do just fine. If you need to measure deformations of a water dam 100m away, then you need absolutely different tool.
Considerar o escopo do projeto, incluindo o tamanho, tolerancia requerida, forma e complexidade do objeto é fundamental ao escolher o scanner certo para garantir resultados precisos e confiáveis na digitaliza??o a laser. é importante lembrar que existem diferentes tipos de escaneamento, desde escaneamento de ambientes amplos até pe?as pequenas que requerem precis?o centesimal. Avaliar isso de maneira efetiva vai maximizar a qualidade e eficiência da digitaliza??o.
To ensure high-quality deliverables for laser scanning ensuring accuracy and reliability is crux. The first step is to regularly calibrate and maintain advanced equipment and ensure that it is in optimal condition. Data verification against known reference points and using good software for processing the data are vital factors. Skilled scan technicians, operators, and quality assurance protocols like reviews and analysis, cross-checking, further enhance accuracy. Post-process analysis and documentation help ensure traceability of the data. Integrating these practices in the workflow of the scanning services guarantees precise and dependable laser scanning deliverables.
The second step to ensure the accuracy and reliability of your laser scanning results is to calibrate your scanner before and after each scanning session. Calibration is the process of adjusting the scanner's settings and parameters to match the actual conditions and measurements of the real world. Calibration can help reduce errors, noise, and distortion in your laser scanning data, as well as improve the consistency and compatibility of your data across different scanners and software. Follow the manufacturer's instructions and use the appropriate tools and methods to calibrate your scanner.
Since one terrible project, we are using Check&adjust on every project. Our RTC360 just came from official calibration. We did not have the information, that the new (at that time) feature Check&Adjust was implemented and we did 600 positions project. The calibration was totally off. After Check&Adjust everything worked perfectly fine. Since then, we do Check&Adjust prior to every job
Calibration is an annual process for most users based on industry standards. Checking that your scanner is within calibrated limits, before scanning a project with 'high accuracy' requirements, is essential. Doing a 'check & adjust' procedure will ensure you are operating within the expected tolerance. Is also important to do test scans prior to your site visit. Visually inspecting the overlap in your scan data will also flag any potential errors. Most instruments will have a 'calibration check' procedure. But in order to carry out a full 'check & adjust', some equipment may require very stringent site conditions for an accurate and successful 'check & adjust'. For example 8m height, 40m distance, etc. Check the manufacturer's manual.
Seguir as instru??es do fabricante e usar as ferramentas apropriadas s?o práticas fundamentais para garantir uma calibra??o adequada e, consequentemente, resultados de varredura de alta qualidade. A calibra??o periódica do equipamento, processos de verifica??o intermediária e calibra??o em loco antes do uso s?o passos essenciais para garantir a confiabilidade e consistência dos dados.
Be sure to plan your scanning strategy in advance. Scanning strategy is the way you design and execute your scanning workflow, such as selecting the scan positions, angles, and distances, setting the scan resolution and quality, and determining the number and type of scan targets. A good scanning strategy can help you optimize the coverage, completeness, and accuracy of your laser scanning data, as well as reduce the time and cost of scanning and processing. You should plan your scanning strategy based on your project goals, scope, and constraints.
Site conditions will very much affect the outcome of any cloud-to-cloud registration. With vegetation and moving objects putting you most at risk. Planning your approach, based on the site conditions that will be active at the time of the survey, is also another pivotal milestone in your workflow. Find out as much as you can about the conditions, prior to your visit, to choose maybe 'out-of-hours' scanning, or scanning at the times when there is the least amount of 'traffic'. Having a clear area, free of movement, and doing as much cleaning as possible while on site, minimizes the workflow in the office as well. Some equipment offers a 'double-scan' feature to eliminate moving objects, and a range limit. Use these to your advantage.
Taking the time to walk the site and plan your route will make scanning easier. Being aware of areas you may have issues such as reflective surfaces or odd angled rooms will help you to plan out a path that mitigates those issues. Take the time to talk with site personnel as well to set expectations. This will help you better coordinate your scans if there is other work happening at the same time.
Times when we needed to be absolutely effective with scanning positions (because each took ages) are long gone. We prefer strategy, rather do 20% more, than 5% less than needed
Compreender os objetivos do escaneamento é fundamental para definir uma estratégia eficaz que atenda às necessidades do projeto. Uma estratégia bem planejada n?o só melhora a qualidade mas também reduz o tempo e os custos associados ao processo.
Always use scan targets in your scanning process. Scan targets are special markers or objects that can be recognized and measured by the scanner, such as spheres, checkerboards, or barcodes. Scan targets can help you align, register, and georeference your laser scanning data, as well as verify the accuracy and quality of your data. You should use scan targets that are suitable for your scanner and project, and place them strategically and securely in your scan area.
Targets can always improve accuracy in long linear or featureless environments. Tunnels and long roads are two examples of places where it is always quite painful to register. This does not always guarantee accuracy, as targets can move, they can also sometimes not get extracted correctly (through automated extraction), and still need to be in a random pattern, rather than consistently the same distance same orientation to all scan positions. If the pattern repeats, you run the risk of misidentifying targets and getting scans in the wrong place. Always randomize your target placement! Spheres work very well in tunnel environments and checkered boards work well for most other indoor and outdoor where they are controlled targets.
Very much depending on site conditions. If you scan long tunnels, featureless environments, then use targets for every scan position. If you are doing an office building, than use targets for halls and stairs (just in case) If you are doing simpler buildings, use targets only for georeferencing
The fifth step to ensure the accuracy and reliability of your laser scanning results is to check your scan data during and after your scanning process. This can help you identify and correct any errors, gaps, or anomalies in your laser scanning data, such as missing or overlapping areas, noise or artifacts, or misalignment or distortion. You should use the scanner's built-in software or a dedicated software tool to check your scan data, and compare it with the original object or scene, as well as with other scan data sets.
If your tool allows it, always preregister your data on the fly. A: you know where you have already scanned B: you avoid headaches with offsite registration
There is no substitute for human verification and checks. Within scan data - the overlap of the point cloud is the most important. The software is often able to colourize the point cloud into different colours, so that you can see if the colour merge in both the top-down plan view, and the 'section' or 'elevation' view. You should never see 'ghosting' or 'double-lines'. This means that there is a separation in the data and this is not good. Luckily some software give you the ability to do these verifications very quickly and spot the errors - allowing you to fix this, on the go.
Entendo que, muitas vezes, o processamento ocorre muito tempo após a coleta, onde a disponibilidade de novas tomadas é limitada. Portanto, é crucial entender as necessidades do projeto e revisar cuidadosamente os dados antes de considerar o processo concluído. Quando o objetivo é a compara??o do escaneamento com cad tente sempre fazer uma pré avalia??o em loco.
Always process your scan data properly and efficiently. Processing your scan data is the act of transforming your raw laser scanning data into a usable and meaningful 3D model or representation, such as a point cloud, a mesh, or a CAD model. Processing your scan data can involve various steps and techniques, such as filtering, cleaning, aligning, registering, merging, editing, modeling, and analyzing. Use the appropriate software tools and methods to process your data, and follow the best practices and standards of your industry or application.
A escolha do software para cada aplica??o é essencial para a qualidade, tempo e custo do projeto. Cada etapa do processamento, desde filtragem até modelagem e análise, requer ferramentas e métodos específicos que podem variar de acordo com as necessidades do projeto e as características dos dados.
First and foremost is training. Good training will go along way. It may look easy, and can be for those that have been doing it for a while, but good scans start with a good scanning technician. It would be wasteful to spend lots of time scanning only to realize later that they are garbage.
Understanding how to register the data after you have acquired it is also crucial. Knowing how the technology works helps to understand what is likely reliable data verses data that may be dimensionally unsound.