This GIS dataset depicts the surficial geology of the Grand Rapids area (NTS 84A/SE) (GIS data, polygon features). The data were created in geodatabase format and output for public distribution in shapefile format.
These data comprise the polygon features of Alberta Geological Survey Map 566, Surficial Geology of the Grand Rapids Area (NTS 84A/SE).
Our processes included
1. making a LiDAR imagery mosaic for complete coverage of NTS 84A/SE and relief shading the LiDAR bare-earth digital elevation model (DEM);
2. making a mosaic of Landsat ETM+ scenes L7104302002019990817 and LE70430211999229EDC00 (see map 566 for full reference) and clipping it to the map area boundary;
3. performing image classification on the Landsat data using the maximum likelihood classifier, collecting training objects, and classifying peatlands using Landsat spectral properties and LiDAR topographic indices;
4. delineating non-peatland polygons from object-based analysis of a slope image derived from the LiDAR imagery
5. augmenting the classified landforms with digitization of polygons and line features across the LiDAR image of NTS 84A/SE using ArcGIS;
6. labelling spatial features;
7. checking the quality of the digital file; and
8. proofreading the text.