Svl underground utility photogrammetry survey
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This document provides an overview of photogrammetry. It discusses that photogrammetry is a branch of surveying that uses photographs taken from aircraft or the ground to indirectly measure and map objects. The first uses of photogrammetry date back to 1840, but airplanes in the early 1900s greatly advanced the technique. Photogrammetry can be aerial or terrestrial, and has advantages like being cost-effective for large areas and allowing access to dangerous or inaccessible locations. It requires experienced staff and good weather conditions.
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Hytola Engineering Oy used a UAV to take over 10,000 high resolution images over four days to map a 50 hectare quarry in Finland. 3D models and point clouds were processed from the images, with an average point density of 1250 points per square meter. Signal plates were placed as ground control points to georeference the 3D model. The UAV flew pre-planned routes to capture images from optimal distances and angles to the quarry walls given the desired 1 cm resolution. The large amount of image data was processed into accurate orthomosaics, 3D models, and a point cloud with over 1 billion points, allowing for various analyses of the quarry terrain.
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Satellite and aerial images can be used to collect cadastral data. Satellite images with resolution of less than 1 meter can be obtained for Ethiopia. Reference points are needed to georeference images and software like ArcGIS can be used to digitize parcel boundaries. While satellite images provide an overview, boundaries drawn from them require field confirmation. Aerial photos provide higher resolution but are more expensive to capture. Both image types require ground truthing due to potential errors and changes over time.
5. lecture 4 data capturing techniques - satellite and aerial images
Satellite and aerial images can be used to collect cadastral data. Satellite images with resolution of less than 1 meter can be obtained for Ethiopia. Reference points are needed to georeference images and software like ArcGIS can be used to digitize parcel boundaries. While satellite images provide an overview, boundaries drawn from them require field confirmation. Aerial photos provide higher resolution and allow 3D modeling but are more expensive to capture. Both image types require accuracy checking and may be affected by changes, clouds, or obscured borders.
Photogrammetry
This document discusses different types of aerial photographs used for mapping, including black and white, color, and near-infrared photographs. It also describes some basic elements of aerial photographs like fiducial marks and principal points. Finally, it outlines different types of geometric errors that can occur in vertical aerial photography, such as optical distortion, tilt, roll distortion, crab distortion, and pitch distortion, and how they are caused by factors like camera problems or aircraft motion.
Relief displacement
This document discusses methods for calculating the heights of objects like trees and buildings from aerial photos. It describes the relief/radial displacement method, where the displacement between the top and bottom of an object seen in a single aerial photo is used along with the distance from the principal point to determine height. It explains that relief displacement occurs due to perspective projection and varies with object elevation relative to the datum. An example problem demonstrates using measured displacement and distance to calculate an object's height given the flying height.
matsuoka_igarss2011.ppt
1) The document analyzes ground deformation from the 2010 El Mayor, Mexico earthquake using pre- and post-event satellite images.
2) It finds displacements of approximately 2 meters east-west and 1.5 meters south-north along the fault line through sub-pixel correlation analysis.
3) The results are comparable to field survey measurements and indicate a maximum right-lateral strike slip along the fault from the earthquake.
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Recommended
Presentation
This document provides an overview of photogrammetry. It discusses that photogrammetry is a branch of surveying that uses photographs taken from aircraft or the ground to indirectly measure and map objects. The first uses of photogrammetry date back to 1840, but airplanes in the early 1900s greatly advanced the technique. Photogrammetry can be aerial or terrestrial, and has advantages like being cost-effective for large areas and allowing access to dangerous or inaccessible locations. It requires experienced staff and good weather conditions.
3D mapping of a quarry
Hytola Engineering Oy used a UAV to take over 10,000 high resolution images over four days to map a 50 hectare quarry in Finland. 3D models and point clouds were processed from the images, with an average point density of 1250 points per square meter. Signal plates were placed as ground control points to georeference the 3D model. The UAV flew pre-planned routes to capture images from optimal distances and angles to the quarry walls given the desired 1 cm resolution. The large amount of image data was processed into accurate orthomosaics, 3D models, and a point cloud with over 1 billion points, allowing for various analyses of the quarry terrain.
5. lecture 4 data capturing techniques - satellite and aerial images
Satellite and aerial images can be used to collect cadastral data. Satellite images with resolution of less than 1 meter can be obtained for Ethiopia. Reference points are needed to georeference images and software like ArcGIS can be used to digitize parcel boundaries. While satellite images provide an overview, boundaries drawn from them require field confirmation. Aerial photos provide higher resolution but are more expensive to capture. Both image types require ground truthing due to potential errors and changes over time.
5. lecture 4 data capturing techniques - satellite and aerial images
Satellite and aerial images can be used to collect cadastral data. Satellite images with resolution of less than 1 meter can be obtained for Ethiopia. Reference points are needed to georeference images and software like ArcGIS can be used to digitize parcel boundaries. While satellite images provide an overview, boundaries drawn from them require field confirmation. Aerial photos provide higher resolution and allow 3D modeling but are more expensive to capture. Both image types require accuracy checking and may be affected by changes, clouds, or obscured borders.
Photogrammetry
This document discusses different types of aerial photographs used for mapping, including black and white, color, and near-infrared photographs. It also describes some basic elements of aerial photographs like fiducial marks and principal points. Finally, it outlines different types of geometric errors that can occur in vertical aerial photography, such as optical distortion, tilt, roll distortion, crab distortion, and pitch distortion, and how they are caused by factors like camera problems or aircraft motion.
Relief displacement
This document discusses methods for calculating the heights of objects like trees and buildings from aerial photos. It describes the relief/radial displacement method, where the displacement between the top and bottom of an object seen in a single aerial photo is used along with the distance from the principal point to determine height. It explains that relief displacement occurs due to perspective projection and varies with object elevation relative to the datum. An example problem demonstrates using measured displacement and distance to calculate an object's height given the flying height.
matsuoka_igarss2011.ppt
1) The document analyzes ground deformation from the 2010 El Mayor, Mexico earthquake using pre- and post-event satellite images.
2) It finds displacements of approximately 2 meters east-west and 1.5 meters south-north along the fault line through sub-pixel correlation analysis.
3) The results are comparable to field survey measurements and indicate a maximum right-lateral strike slip along the fault from the earthquake.
SfM Research Applications Presentation
This PowerPoint was created by Kate Shervais while working at UNAVCO to introduce the concept of Structure from Motion and show the different applications of the methodology.
Photogrammetry: A Quick Primer
This document provides an overview of photogrammetry, which is the process of using photographs to measure and survey objects and landscapes. It discusses different types of photogrammetry like stereography and structure from motion (SfM). SfM uses photographs to build 3D models and can be used with images from any camera. The document also outlines common uses of photogrammetry in fields like geology, archaeology, and engineering. It provides guidance on capturing images for photogrammetry projects of objects, buildings, and interiors.
Aerial photogrammetry ppt 2
This document discusses various techniques for analyzing aerial photographs, including:
- Calculating the scale of photographs based on known distances and camera specifications. Scale expresses the ratio of distances on the photo to distances on the ground.
- Determining the heights of objects visible in photos using relief displacement, which measures the difference in an object's appearance between the top and bottom due to perspective.
- Planning flight paths to ensure adequate overlap between consecutive aerial photos for stereoscopic analysis and 3D modeling.
- Using a stereoscope to merge overlapping photo pairs and perceive depth and parallax differences between matching points in the stereo pair.
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This document provides an overview of aerial photogrammetry and discusses ground control points (GCPs) and flight planning. It can be summarized as follows:
1) GCPs are points on the ground with known coordinates that are used to georeference aerial photographs. GCPs increase the overall accuracy of maps produced from aerial photos.
2) Flight planning involves determining the optimal altitude, overlaps between photos, and interval between exposures to ensure full coverage of the target area. Factors like wind and drift must be considered.
3) GCPs can be established before or after photography, and both horizontal and vertical control is needed with an ideal distribution across the project area. At least 3-4 G
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This presentation discusses scales used in photographs. It explains that scale is the ratio of an object's size in a photo to its actual size on the ground. Scale can be expressed through a unit equivalent, representative fraction, or ratio. Knowing the camera focal length and aircraft altitude allows one to determine the scale of a vertical photograph. The presentation was given by Mr. Amol V. Ghogare of SRES, SCOE, Kopargaon on the topic of scales used in photographs.
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This presentation provides an introduction to aerial photogrammetry. It defines photogrammetry as "photo-measurement" and explains that aerial photogrammetry uses aerial photographs or remote sensing to collect information. Platforms for aerial photography include aircraft, helicopters, drones, balloons and kites. The presentation compares maps and aerial photogrammetry, outlines the field work process, and lists some common uses. It also describes the different types of aerial photographs, including vertical, tilted, and oblique (low and high). In closing, it thanks the audience.
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This document summarizes research on using laser scanning to generate a 3D model of a cooling tower for deformation analysis. Laser scans of the interior and exterior were taken from 27 setup positions, registering over 22 million points with a mean error of 5mm. The scans were processed in Cyclone and Geomagic Studio to create a simplified polygonal mesh and NURBS surface model suitable for finite element analysis, exported to IGES format. Accuracy was evaluated against geodetic checks and a fitted hyperboloid, finding deviations mostly within ±3cm and ±20cm respectively. The process demonstrated laser scanning and modeling can provide adequate accuracy 3D models for structural analysis applications.
SEU presentatie Greet deruyter
International Seminar on Global Metropolitan Delta’s 2017.
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Historical Development of Photogrammetry
Photogrammetry is the science of obtaining information about physical objects through photographs, without needing direct contact. It involves measuring and analyzing captured images. The name comes from Greek roots meaning "light", "drawing", and "to measure". Key developments included using photography for mapmaking in the 1840s-1850s, the photogrammetric stereoplotter in the 1890s, and aerial photography from balloons and planes in the 1860s-1900s, advancing the field into the digital era.
Using reverse viewshed analysis to assess the location correctness of visuall...
This document discusses using reverse viewshed analysis to assess the location correctness of geotagged photos from Flickr. The researchers analyzed photos of two landmarks in Berlin - the Brandenburg Gate and Reichstag. They categorized each photo based on whether the geotag and label were correct based on the viewshed analysis and manual inspection. Their results showed geotags and labels were less accurate for photos further from the landmarks and users with fewer total photos. The researchers propose using additional data like observer height and a weighted credibility score to improve location correctness assessment of visually generated VGI.
Height measurement of aerial photography
This document discusses various methods for measuring height from aerial photographs:
1. Relief displacement - The shift in location of an object in a photo due to its height. Height can be calculated using the object's displacement, flying height, and distance from the photo center.
2. Shadow length - An object's height is calculated using the length of its shadow, the sun's angle, and trigonometric functions.
3. Stereoscopic parallax - Taking photos of the same object from different positions and measuring the difference in the object's position between photos. Differential and absolute parallax values are used to calculate height.
Photogrammetry
Photogrammetry is the science of making reliable measurements using photographs, especially aerial photographs, and has evolved from early uses in surveying to include aerial photography from airplanes, satellite imagery, and most recently drone-derived imagery. It allows the creation of accurate maps and three-dimensional models through the process of extracting measurements from overlapping photographs. Since the Wright brothers' first flight, photogrammetry has advanced from using airplanes to capture early aerial photos for mapping to using satellites and drones to capture imagery on an ever wider scale.
Height measurement of aerial photograph
This document discusses three methods for measuring height from aerial photographs: relief displacement, shadow length, and stereoscopic parallax. Relief displacement measures height by how far an object is shifted from its true position in an aerial photo due to its elevation. Shadow length measures height by using the length of an object's shadow and the sun angle. Stereoscopic parallax measures height by comparing the difference in an object's position between two overlapping aerial photos taken from different positions. Formulas are provided for calculating height from measurements obtained using each of these three methods.
Remote Sensing error sources
1. Geometric distortions are inherent in remote sensing images and can occur due to several factors including the sensor optics and platform stability.
2. Sources of errors include the perspective of sensor optics, motion and orientation of the scanning system, stability of the platform, platform altitude and attitude, terrain relief, and Earth's curvature and rotation.
3. In mountainous regions, a satellite-based scanning system would be preferable to an aircraft-based system due to less amplification of geometric distortions from relief displacement and shadowing effects at satellite altitudes.
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This document discusses point clouds generated from images taken with rolling shutter cameras on consumer drones. It contains the following key points:
1) Pix4D software can model geometric distortions from rolling shutter cameras to improve mapping accuracy, allowing drones to be flown at higher speeds.
2) Experiments show rolling shutter modeling improves results for all rolling shutter cameras, bringing accuracies to the usual 2-3 pixel range. It does not negatively impact accuracy for global shutter cameras.
3) Accuracy from rolling shutter modeling increases with drone flight speed, and global shutter cameras tend to be slightly more accurate than rolling shutter cameras.
Aerial Photogrammetry 01
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World Wind is an open source 3D interactive world viewer created by NASA. This project has extended the basic navigation mode in World Wind version 0.4.1 to include the following:
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Drone li dar vs photogrammetry
Get detailed information on choosing LiDAR or photogrammetry for 3D mapping and surveying from your UAV. Also, know when you should use them both? And check which one is the best, Drone LiDAR or Photogrammetry?
Photographic survey
PRESENTATION BASED ON DETAILED INFORMATION ABOUT PHOTOGRAMMETRY ONE OF THE IMPORTANT TOPICS OF SURVEYING.
photogrammetry surveying.pptx.pdf
Photogrammetry is the science of obtaining reliable information about physical objects through the process of recording, measuring, and interpreting photographic images. It allows the extraction of geometric information from photographs to create 3D models. There are two main types: aerial photogrammetry uses photographs taken from aircraft, while terrestrial photogrammetry uses ground-based photos. The fundamental principle is triangulation - by taking photos from different locations, lines of sight can be developed and the precise location of points can be determined through mathematical intersection of converging lines. Important applications of photogrammetry include topographic mapping, engineering and construction projects, archaeology, and military intelligence gathering.
3-d interpretation from single 2-d image III
This document summarizes several papers related to monocular 3D object detection for autonomous driving. The first paper proposes MoVi-3D, a single-stage architecture that leverages virtual views to reduce visual appearance variability from objects at different distances, enabling detection across depths. The second paper describes RTM3D, which predicts object keypoints and uses geometric constraints to recover 3D bounding boxes in real-time. The third paper decouples detection into structured polygon estimation and height-guided depth estimation. It predicts 2D object surfaces and uses object height to estimate depth.
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Photogrammetry: A Quick Primer
This document provides an overview of photogrammetry, which is the process of using photographs to measure and survey objects and landscapes. It discusses different types of photogrammetry like stereography and structure from motion (SfM). SfM uses photographs to build 3D models and can be used with images from any camera. The document also outlines common uses of photogrammetry in fields like geology, archaeology, and engineering. It provides guidance on capturing images for photogrammetry projects of objects, buildings, and interiors.
Aerial photogrammetry ppt 2
This document discusses various techniques for analyzing aerial photographs, including:
- Calculating the scale of photographs based on known distances and camera specifications. Scale expresses the ratio of distances on the photo to distances on the ground.
- Determining the heights of objects visible in photos using relief displacement, which measures the difference in an object's appearance between the top and bottom due to perspective.
- Planning flight paths to ensure adequate overlap between consecutive aerial photos for stereoscopic analysis and 3D modeling.
- Using a stereoscope to merge overlapping photo pairs and perceive depth and parallax differences between matching points in the stereo pair.
Aerial photogrammetry 04
This document provides an overview of aerial photogrammetry and discusses ground control points (GCPs) and flight planning. It can be summarized as follows:
1) GCPs are points on the ground with known coordinates that are used to georeference aerial photographs. GCPs increase the overall accuracy of maps produced from aerial photos.
2) Flight planning involves determining the optimal altitude, overlaps between photos, and interval between exposures to ensure full coverage of the target area. Factors like wind and drift must be considered.
3) GCPs can be established before or after photography, and both horizontal and vertical control is needed with an ideal distribution across the project area. At least 3-4 G
Photogrammetry: Latest Technology to Create Maps Using Drones?
Photogrammetry uses photographs and measurements to create maps. Drones are increasingly used for aerial photogrammetry, as they are cheaper than planes and pose no risk to pilots. The document discusses how photogrammetry works by processing overlapping drone photos with software to generate 3D maps. It has many applications for construction professionals and allows creating detailed models and measurements from images.
WE2.TO9.5.ppt
The document presents an algorithm for extracting 3D geometrical features from synthetic aperture radar (SAR) images of ocean ships. It uses signal processing and optical image processing techniques to extract shape parameters like length, width, height, and relative angle to the radar. The algorithm first performs preprocessing on SAR images, then extracts projected ellipse features and estimates azimuth using nonlinear least squares estimation. Experiments on simulated fishing ship and ellipsoid SAR images show the algorithm can accurately extract length but has room for improvement in estimating width and height.
Scale of photograph (Aerial Photogrammetry)
This presentation discusses scales used in photographs. It explains that scale is the ratio of an object's size in a photo to its actual size on the ground. Scale can be expressed through a unit equivalent, representative fraction, or ratio. Knowing the camera focal length and aircraft altitude allows one to determine the scale of a vertical photograph. The presentation was given by Mr. Amol V. Ghogare of SRES, SCOE, Kopargaon on the topic of scales used in photographs.
Aerial photogrammetry ppt 1
This presentation provides an introduction to aerial photogrammetry. It defines photogrammetry as "photo-measurement" and explains that aerial photogrammetry uses aerial photographs or remote sensing to collect information. Platforms for aerial photography include aircraft, helicopters, drones, balloons and kites. The presentation compares maps and aerial photogrammetry, outlines the field work process, and lists some common uses. It also describes the different types of aerial photographs, including vertical, tilted, and oblique (low and high). In closing, it thanks the audience.
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This document summarizes research on using laser scanning to generate a 3D model of a cooling tower for deformation analysis. Laser scans of the interior and exterior were taken from 27 setup positions, registering over 22 million points with a mean error of 5mm. The scans were processed in Cyclone and Geomagic Studio to create a simplified polygonal mesh and NURBS surface model suitable for finite element analysis, exported to IGES format. Accuracy was evaluated against geodetic checks and a fitted hyperboloid, finding deviations mostly within ±3cm and ±20cm respectively. The process demonstrated laser scanning and modeling can provide adequate accuracy 3D models for structural analysis applications.
SEU presentatie Greet deruyter
International Seminar on Global Metropolitan Delta’s 2017.
Reliable 3d data acquisition and modelling for spatial planning and flood risks.
Historical Development of Photogrammetry
Photogrammetry is the science of obtaining information about physical objects through photographs, without needing direct contact. It involves measuring and analyzing captured images. The name comes from Greek roots meaning "light", "drawing", and "to measure". Key developments included using photography for mapmaking in the 1840s-1850s, the photogrammetric stereoplotter in the 1890s, and aerial photography from balloons and planes in the 1860s-1900s, advancing the field into the digital era.
Using reverse viewshed analysis to assess the location correctness of visuall...
This document discusses using reverse viewshed analysis to assess the location correctness of geotagged photos from Flickr. The researchers analyzed photos of two landmarks in Berlin - the Brandenburg Gate and Reichstag. They categorized each photo based on whether the geotag and label were correct based on the viewshed analysis and manual inspection. Their results showed geotags and labels were less accurate for photos further from the landmarks and users with fewer total photos. The researchers propose using additional data like observer height and a weighted credibility score to improve location correctness assessment of visually generated VGI.
Height measurement of aerial photography
This document discusses various methods for measuring height from aerial photographs:
1. Relief displacement - The shift in location of an object in a photo due to its height. Height can be calculated using the object's displacement, flying height, and distance from the photo center.
2. Shadow length - An object's height is calculated using the length of its shadow, the sun's angle, and trigonometric functions.
3. Stereoscopic parallax - Taking photos of the same object from different positions and measuring the difference in the object's position between photos. Differential and absolute parallax values are used to calculate height.
Photogrammetry
Photogrammetry is the science of making reliable measurements using photographs, especially aerial photographs, and has evolved from early uses in surveying to include aerial photography from airplanes, satellite imagery, and most recently drone-derived imagery. It allows the creation of accurate maps and three-dimensional models through the process of extracting measurements from overlapping photographs. Since the Wright brothers' first flight, photogrammetry has advanced from using airplanes to capture early aerial photos for mapping to using satellites and drones to capture imagery on an ever wider scale.
Height measurement of aerial photograph
This document discusses three methods for measuring height from aerial photographs: relief displacement, shadow length, and stereoscopic parallax. Relief displacement measures height by how far an object is shifted from its true position in an aerial photo due to its elevation. Shadow length measures height by using the length of an object's shadow and the sun angle. Stereoscopic parallax measures height by comparing the difference in an object's position between two overlapping aerial photos taken from different positions. Formulas are provided for calculating height from measurements obtained using each of these three methods.
Remote Sensing error sources
1. Geometric distortions are inherent in remote sensing images and can occur due to several factors including the sensor optics and platform stability.
2. Sources of errors include the perspective of sensor optics, motion and orientation of the scanning system, stability of the platform, platform altitude and attitude, terrain relief, and Earth's curvature and rotation.
3. In mountainous regions, a satellite-based scanning system would be preferable to an aircraft-based system due to less amplification of geometric distortions from relief displacement and shadowing effects at satellite altitudes.
Point Clouds from Rolling Shutter Cameras
This document discusses point clouds generated from images taken with rolling shutter cameras on consumer drones. It contains the following key points:
1) Pix4D software can model geometric distortions from rolling shutter cameras to improve mapping accuracy, allowing drones to be flown at higher speeds.
2) Experiments show rolling shutter modeling improves results for all rolling shutter cameras, bringing accuracies to the usual 2-3 pixel range. It does not negatively impact accuracy for global shutter cameras.
3) Accuracy from rolling shutter modeling increases with drone flight speed, and global shutter cameras tend to be slightly more accurate than rolling shutter cameras.
Aerial Photogrammetry 01
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Extended Navigation Mode in NASA World Wind Java
World Wind is an open source 3D interactive world viewer created by NASA. This project has extended the basic navigation mode in World Wind version 0.4.1 to include the following:
- Look left & right
- Look up & down
- Change the altitude of the camera
- Fly mode (mouse only)
Drone li dar vs photogrammetry
Get detailed information on choosing LiDAR or photogrammetry for 3D mapping and surveying from your UAV. Also, know when you should use them both? And check which one is the best, Drone LiDAR or Photogrammetry?
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Photogrammetry is the science of obtaining reliable information about physical objects through the process of recording, measuring, and interpreting photographic images. It allows the extraction of geometric information from photographs to create 3D models. There are two main types: aerial photogrammetry uses photographs taken from aircraft, while terrestrial photogrammetry uses ground-based photos. The fundamental principle is triangulation - by taking photos from different locations, lines of sight can be developed and the precise location of points can be determined through mathematical intersection of converging lines. Important applications of photogrammetry include topographic mapping, engineering and construction projects, archaeology, and military intelligence gathering.
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3D scanning can also be done for other purposes. For example, scientists and engineers are using 3D scanners to survey archeological, construction, crime scene, and engineering sites, to document maintenance and repair of engineered systems, and to customize medical and dental products for humans. Improvements in lasers, LEDs, camera chips, ICs, and other components continue to improve the economic feasibility of 3D scanning. Longer wavelength lasers increase the scanning range, better camera chips improve the scanning resolution, and better lasers, camera chips, and processor ICs reduce the scanning time. For example, third generation scanners from Argon, one leading supplier, have 100 times higher resolution and one tenth the scan times of Argon’s first generation system.
For costs, lasers make up the largest percentage followed by camera and processor ICs. For example, lasers make up 80% of the hardware cost for one high-end system with a current cost of $1346 and a price of about $3000. As laser costs fall and as volumes enable smaller margins, the price of such systems will fall.
For the same reasons, low-end systems continue to emerge. These include Microsoft’s Kinect and an app for the iPhone. Microsoft’s Kinect was $150 while the app was only $4.99, both in early 2013. As such low-end systems proliferate, and high-end systems continue to get cheaper, 3D scanning will find new applications.
Ch 26 miscellaneous of metrology
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chapter19. Terrestrial and Close-Range Photogrammetry.pdf
This document discusses terrestrial and close-range photogrammetry. It describes how terrestrial photogrammetry involves photographs taken from cameras on the earth's surface, which can be handheld, mounted on tripods, or suspended. Close-range photogrammetry refers to terrestrial photos taken from up to around 300 meters. Various applications of terrestrial photogrammetry are discussed, including topographic mapping, traffic accident reconstruction, and measuring objects that are otherwise inaccessible. Analytical self-calibration methods are also summarized, which allow camera calibration parameters to be solved for directly during photogrammetric processing.
3D Indoor and Outdoor Mapping from Point Cloud Generated by Spherical Camera
3D Indoor and Outdoor Mapping from Point Cloud Generated by Spherical CameraNational Cheng Kung University
1) The document presents a technique for 3D mapping of indoor and outdoor environments using point clouds generated from spherical camera images.
2) The technique involves acquiring spherical images with a Garmin VIRB 360 camera, processing them in Agisoft Photoscan Pro to generate point clouds, and importing point clouds into Revit for 3D CAD modeling.
3) Accuracy is evaluated by measuring errors between reference scales and points in images and calculated angle delineations, finding standard deviations of 9.23 degrees for outdoor and 0.8 degrees for indoor environments.Image characterisation & aerial photographic film technology
A digital image is composed of a two-dimensional grid of pixels, where each pixel represents an area on the ground and has an intensity value and location address. Both digital images and analog photographs can be represented this way. Digital images have higher spatial, spectral, and radiometric resolutions than analog photographs, allowing for more detailed analysis. Aerial photographs can be analog, captured on film, or digital. Common film types include color, color infrared, black and white, and video films suited for different remote sensing applications.
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Svl underground utility photogrammetry survey
- 1. Underground Utility Photogrammetry Survey BY STAR VISION LIMITED
- 2. “ ” Photogrammetry is an art, because obtaining reliable measurements requires certain skills, techniques and judgments to be made by an individual. U.S.A. GOVERNMENT
- 3. Star Vision Photogrammetry Approach Project Reference: Culvert Photogrammetry Survey, S. Korea • Down to mm precision level 3D Position • With 19 Photos, able to survey about 5-10m box culvert length • Instead of sending surveyor to underground, SV remote control camera does the job. Precise Economical Safe
- 4. Step 1 Photo –taking by Users / Star Vision
- 5. Step 2 SVL processes all photos (from 10+ to 1000+ photo subject to project site) to produce a full colour 3D Model ( with 3D Points, 3D point cloud like LiDAR, laser scanning without laser scanning machine)
- 6. Culvert Model Brief 3D points : 300,000 3D face (polygon): 600,000 Blue plane is original photo position in 3D space Dark line is the orientation of 3D axis of camera
- 7. 30 degree Angle View detect that the box culvert is not 90 degree align with the extension wall. Visualize that about 45 degree to the right. The alignment is straight into the underground. With water on bottom, left side is smooth but ceiling is rough as may due to deterioration.
- 8. Step 3 SVL provides documentation, land surveying record and Geo-visualization for 2D, 3D or even 5D Presentation.