Proposed Abstract Title

Structure from motion: proof of concept for shoreline monitoring

Type of Presentation

Snapshot

Session Title

Mapping and Data

Location

2016SSEC

Description

In concert with recent efforts to monitor the effects of seawall removal on Puget Sound beaches we have explored the feasibility of using Structure from Motion (SfM) to document changes in beach elevation over time. SfM is a technique that uses digital imagery to build three dimensional elevation models of the object in the image. Using photos taken with relatively inexpensive digital cameras and ground control points from seawall removal sites and reference sites, we employed the image-based modeling software, Agrisoft Photoscan, to create 3D scene reconstructions and dense point clouds, along with high resolution 2D digital elevation models (DEMs). In addition, we collected beach surface elevation data at some of the same beaches using a total station and a RTK GPS to compare results across methods. Our results show that SfM may be used to create reliable high resolution topographic datasets in both 2 and 3 dimensions, and with considerably less expense than other survey techniques. We will provide a brief description of our photo sampling techniques and present examples of the 3D scene reconstructions and DEMs we have produced using these techniques.

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Structure from motion: proof of concept for shoreline monitoring

2016SSEC

In concert with recent efforts to monitor the effects of seawall removal on Puget Sound beaches we have explored the feasibility of using Structure from Motion (SfM) to document changes in beach elevation over time. SfM is a technique that uses digital imagery to build three dimensional elevation models of the object in the image. Using photos taken with relatively inexpensive digital cameras and ground control points from seawall removal sites and reference sites, we employed the image-based modeling software, Agrisoft Photoscan, to create 3D scene reconstructions and dense point clouds, along with high resolution 2D digital elevation models (DEMs). In addition, we collected beach surface elevation data at some of the same beaches using a total station and a RTK GPS to compare results across methods. Our results show that SfM may be used to create reliable high resolution topographic datasets in both 2 and 3 dimensions, and with considerably less expense than other survey techniques. We will provide a brief description of our photo sampling techniques and present examples of the 3D scene reconstructions and DEMs we have produced using these techniques.