Utilizing Terrestrial Photogrammetry to Identify and Track - - PowerPoint PPT Presentation

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utilizing terrestrial

Utilizing Terrestrial Photogrammetry to Identify and Track - - PowerPoint PPT Presentation

Dec 24, 2023 342 likes •589 views

Utilizing Terrestrial Photogrammetry to Identify and Track Landslide Geometry and Potentially Movement By: Max Winn What is photogrammetry? Photogrammetry is the science of making measurements from photographs. photogrammetry.com

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Utilizing Terrestrial Photogrammetry to Identify and Track Landslide Geometry and Potentially Movement

By: Max Winn

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What is photogrammetry?

“Photogrammetry is the science of making measurements from photographs.” – photogrammetry.com “Photogrammetry is the science and technology of

btaining reliable information about physical objects and

the environment through the process of recording, measuring and interpreting photographic images and patterns of electromagnetic radiant imagery and other phenomena.” – Wikipedia

https://www.researchgate.net/figure/Schematic-drawing-of-photogrammetry_fig4_272609988

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Two common types of photogrammetry

 Aerial Photogrammetry



Terrestrial Photogrammetry

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Pros and Cons of Terrestrial Photogrammetry

 Pros

 Cost-effective  No need for

drones/airplanes

 Can get into spaces

these vehicles cannot

 All you need is your

smart phone

 Cons

 Scale is limited

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Cost effective

 Proprietary

 AGISOFT - $59 standard/$549 professional (educational license)  Autodesk ReCap - $40 monthly/$325 one year (1-month free trial)

 Open Source

 MicMac  Meshroom  3DF Zephyr (Free version)  Visual SFM  Regard3D

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Creating a photogrammetric model

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The Workflow

Align Photos Build Dense Cloud Scale the Model Align Chunks Build Mesh Build Digital Elevation Model

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Align Photos Build Dense Cloud Scale the Model Align Chunks Build Mesh Build Digital Elevation Model

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Align Photos Build Dense Cloud Scale the Model Align Chunks Build Mesh Build DEM

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Align Photos Build Dense Cloud Scale the Model Align Chunks Build Mesh Build Digital Elevation Model

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Align Photos Build Dense Cloud Scale the Model Align Chunks Build Mesh Build Digital Elevation Model

Create Tie Points

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Align Photos Build Dense Cloud Scale the Model Align Chunks Build Mesh Build Digital Elevation Model

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Align Photos Build Dense Cloud Scale the Model Align Chunks Build Mesh Build Digital Elevation Model

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Align Photos Build Dense Cloud Scale the Model Align Chunks Build Mesh Build Digital Elevation Model

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Align Photos Build Dense Cloud Scale the Model Align Chunks Build Mesh Build Digital Elevation Model

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Results: Height Difference Map

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Results

100 200 300 400 500 600 700 800 900 1000 NB Real NB Model Ugg Real Ugg Model Dell Real Dell Model

Volume, in^3 Targets

Volume of targets

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Make sure you have the necessary processing power

 System requirements

 At least 32 GB RAM  You need a good graphics card

 Most companies have a system

requirements page, check this before considering any software

 Ask your advisors if there is a computer

lab where you can use this type of software

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William Street Landslide

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William Street Landslide

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Summary

 Photogrammetry offers an effective way to characterize landslide geometry –

elevation, slope, volume

 Taking sequential surveys offers the potential to track the surface movements

at a landslide prone site

 Based on results, assess what mitigation techniques could be taken