Agisoft

Roman Amphitheatre – Agisoft PhotoScan Tutorials by agisoft-coaching.com on Sketchfab From some pictures taken from the Roman Amphitheatre, Trieste, Italy, i try to reconstruct a 3d faithful to reality as textures and as proportions. The semiautomatic process converts simple photos with solid textures. Agisoft has published a handy document showing the RAM needs with different combinations of photos, using 12MP (megapixels) as a base image size. This can be used to estimate the amount of RAM you will need by factoring in your image count, photos size, and quality goals. Q: Should I get a solid state drive (SSD) or hard drive (HDD)?

Agisoft Metashape Tutorial
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Lab deliverable is highlighted in Orange about half-way through the lab.

Process digital images and generate 3D spatial data. Fast and highly accurate. Your Source for Agisoft. Founded in 2006 as an innovative research company with focus on computer vision technology, through years of intensive R&D work Agisoft LLC has gained expertise in image processing algorithms, with digital photogrammetry techniques. Agisoft PhotoScan Tutorial Agisoft PhotoScan is a photogrammetry software that allows you to build 3D models from digital photographs. Photogrammetry requires a series of photographs of an object from different angles with some overlap between each photo. Agisoft PhotoScan then recreates.

Lab 10 is loosely based on the Agisoft Intermediate tutorial posted here: https://www.agisoft.com/index.php?id=35

Download photos from the March, 19, 2016 Botanical Garden flight (HERE). You will need to select all of the photos (tick box in upper right next to NAME). I also provide the Bot Garden orthophoto and DEM. They are in their own individual zipped file within your data download.

Copy the zipped file you download to your e: drive
Unzip all of the photos (use right-click>7Zip>Extract To BotGarden…)
Your working directory will be E:BotGarden_19Mar2016

Agisoft Installer: https://www.agisoft.com/downloads/installer/

Download the Professional Windows X64 version
Run the metashape-pro_1_…msi installer
If you are prompted for an Administrator password, let me know. I must enter it for you.

Start Agisoft Metashape Professional

Select ‘Continue using Metashape Professional in demo mode
Typically, you would save your project (File>Save As) to your working directory. Since we are working in demo mode, you can’t

Agisoft Interface:

Workflow:

Add Photos
Align Photos
Build Dense Point Cloud
Build DEM – Not available in Demo Mode
Build Orthomosaic – Not available in Demo Mode
Export Dense Point Cloud, DEM, Orthomosaic – Not available in Demo Mode

Add Photos

Workflow>Add Photos>…

Align Photos

Workflow>Align Photos…

Build Dense Point Cloud

Grab the Navigation tool ( ), click-and-hold to rotate the point cloud. Use the scroll wheel to zoom in and out. Hit the number 0 on the keypad to reset your view.

Click the Cameras button ( ) to show the aligned camera locations.

Classify Dense Point Cloud Ground points (Tools > Dense Cloud > Classify Ground Points)

Display the Dense Cloud Classes ( ). Your point cloud has not yet been classified so you will see shades of grey. Grey points are considered “Created (never classified)”
Tools>Dense Cloud>Classify Ground Points

- Max angle: …sets limitation for an angle between terrain model and the line to connect the point in question with a point from a ground class. In fact, this parameter determines the assumption for the maximum slope of the ground within the scene
- Max distance: … sets limitation for a distance between the point in question and terrain model. In fact, this parameter determines the assumption for the maximum variation of the ground elevation at a time.
- Cell Size: …Determines the size of the cells for point cloud to be divided into as a preparatory step in ground points classification procedure. Cell size should be indicated with respect to the size of the largest area within the scene that does not contain any ground points, e. g. building or close forest.
Note that:
- Classified ground points are shown brown
- “Created (never classified)” points show grey
- “Created (never classified)” and “Unclassified” ARE unique classes

Your initial classification does an OK job separating the ground and surrounding trees. It doesn’t, however, do an acceptable job separating the terrace walls, gazebo, and several other close-to-the-ground features. Reset the classification, Tools>Dense Cloud>Reset Classification, and re-run the “Classify Ground Points” tool with adjusted parameters. Reset the classification and then re-run this ground classification in several batches. First run, set the MAX ANGLE to 1 (leave other parameters at 1 and 50). Take a screen shot of the results (<ALT-PrintScreen>) and paste it into a Word document). Reset the classification and then bump the MAX ANGLE to 10 and repeat. Then reset the classification and rerun using MAX ANGLE set to 45. You can try other values too! Visually, which MAX ANGLE produces the best result? Now, reset the classification, use your best MAX ANGLE and incrementally change the MAX DISTANCE parameter. I would start with 0.1 then maybe 0.5, 2, 10, 40 and try to zero-in on a value that produces visually-accurate results. Be sure to reset the classification each time before you run the next classification. Finally, after selecting your best MAX ANGLE and MAX DISTANCE values, use the same approach to determine a best CELL SIZE. Start with 1, then 25, then 50; this will help you figure out the direction in which you should proceed while using this boot-strap approach to finding a good CELL SIZE value. After each run, make sure you take a screen shot, paste it into a Word document and list the parameters. I would like you to recommend the “best” MAX ANGLE, MAX Distance, and CELL SIZE for this site as well as explain in your own words how these parameters affect your ground classification. Upload your Word document to the “Lab 10 – Agisoft Part 1” ELC Assignment Folder.

Manual classification of dense point cloud

In this small area case, you can easily manually assign the grey points – those “Created (never classified)” points – to the class of your choice.

Select points using the Free-Form Selection tool ( ). Click-and-hold and tract the features you want to select. Release the mouse when you are done drawing.
Tools>Dense Cloud>Assign Class
- From: specifies the point’s current classification
- To: is the class you want to assign to the selected points (that are currently assigned to the From class)
- This allows the user to over-select points when manually selecting

NOTE: You can remove points from a classification by 1) selecting the points, 2) Assign Class where the From Class: is Any and the To Class: is “Created (never classified).

Select Points By Color:

You can select points by their color, too. Look under Tools>Dense Cloud>Select Points By Color . From here, hit the “Select…” button and then the “Pick Screen Color” button for the tool to manually select a color from the point cloud. After making your color-based selection, use the manual method of Assigning a Class described above.

Build DEM (Not available in Demo mode)

Build Orthomosaic (Not available in Demo mode)…

Exports (Not available in Demo Mode):

Export DEM:

Export Ortho:

Export Point Cloud:

Agisoft Metashape is a stand-alone photogrammetric software solution

It allows automatic generation of dense point clouds, textured polygonal models, georeferenced true orthomosaics and Digital Surface Model (DSM) / Digital Terrain Model (DTM) from still images.

Based on the state-of-the-art technology developed by Agisoft, it allows for very fast processing, providing at the same time highly accurate results (up to 3cm of accuracy for aerial photographs, and up to 1mm for close-range photography).

Agisoft Metashape is capable of processing of thousands of photos, yet all the operations are performed locally, without the need to transmit any data outside of your company. This makes of Agisoft an ideal solution for sensitive data processing.

Agisoft Metashape Tutorial

The software package has a linear project-based workflow that is intuitive and can be easily mastered even by a non-specialist. Professional photogrammetrists have the complete control over the results accuracy, thanks to a detailed report that is generated at the end of processing.

Advantages:

Highly accurate and detailed results
Fully automated with intuitive workflow
GPU acceleration for faster processing
Network processing for large projects
Easy sharing with PDF export and direct upload to online resources

Capabilities:

Aerial and close-range triangulation
Dense point cloud generation and classification
True orthomosaic and DSM / DTM generation
Orthomosaic seamline editing
Elevation contour lines generation
Georeferencing using flight log and / or GCPs
Coordinate / distance / area / volume measurements
Multispectral imagery processing and vegetation index calculation (NDVI)
Polygonal model reconstruction and texturing
Hierarchical tiled model generation and visualization
Built-in Python scripting for job automation

Compatibility:

Processes images from frame / fisheye / spherical cameras
Exports results in widely supported formats
Supports most EPSG coordinate systems
Runs on Windows, Mac OS X, Linux

Agisoft Metashape is an integrated solution tailored to needs of industries such as:

Surveying and Mapping
Mining and Quarrying
Precision Agriculture and Environmental Management
Archaeology and Documentation
Architecture and Cultural Heritage Preservation

Our professional UAVs can be delivered with an optional Agisoft Metashape Pro license and a photogrammetry customized training session.

Agisoft Metashape Tutorial

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