Survey data by Alexandra Evans and Kevin Gardner.
2020-05-03: https://doi.org/10.6084/m9.figshare.12943541
2019-11-22: https://doi.org/10.6084/m9.figshare.12943493
License: Creative Commons Attribution 4.0 https://creativecommons.org/licenses/by/4.0/
Derived previews, reprojected renders and difference analysis: Caledon Geospatial.
Sources collected with DJI Phantom 3 Professional and processed in Agisoft PhotoScan; these are not Caledon surveys or Matrice 4E captures.
Horizontal display CRS: EPSG:32619. Source vertical datum: NAVD88 metres, per dataset metadata.
{
  "median_difference_m": -0.19,
  "comparison_area_m2": 48282,
  "outside_1m_percent": 7.2,
  "analysis_cell_m": 1,
  "bounds_utm19n": [
    346895,
    4782433,
    347175,
    4782673
  ],
  "source_dates": [
    "2019-11-22",
    "2020-05-03"
  ],
  "method": "2020 DSM minus 2019 DSM; common EPSG:32619 1 m grid; bilinear resampling; valid intersection only; no additional co-registration; +/-1 m visual screening threshold, not a validated limit of detection."
}