Significant surface change between 2 July and 10 September 2017

The forefield of Larsbreen, close to Longyearbyen on Svalbard, has numerous landslides occurring due to melting dead-ice. Two months of change is shown in colour, on top of the September model.

Red: negative change (erosion)

Blue: positive change (deposition)

The M3C2 algorithm was used for calculating surface change, showing the changes exceeding a 95% confidence threshold. Surface roughness was used as precision estimates, and a registration RMSE of 0.305 [m]. Snow covered areas have been excluded by defining a threshold in colour intensity.

July model: 186 semi-vertical drone images.

September model: 326 semi-vertical and 35 oblique drone images.

The SfM-MVS point clouds were manually registered using 8 stable points, with the September model as reference.

• See the whole M3C2 point cloud
• See the Larsbreen forefield in July 2017