This GIS dataset is a compilation of existing surficial map information for the Calgary-Lethbridge Corridor area tiled into one layer. It is suitable for presentation and use at 1:250 000 scale. The dataset was prepared by appending existing GIS datasets into one layer with a standard attribute table. These datasets were then compared against surficial maps for which GIS data were unavailable. Lastly, polygon boundaries were modified to agree with the surface topography as represented by a digital elevation model (DEM) with a grid cell size of 25 metres. Data sources included published Alberta Geological Survey and Geological Survey of Canada maps and the Agricultural Regions of Alberta Soil Inventory Database Version 4.0. Legend information for each polygon was translated by the author into the standard schema.
This dataset contains the polygon features of Alberta Geological Survey Map 579, Surficial Geology of the Calgary-Lethbridge Corridor, and has been exported in shapefile format for public distribution.
To produce this dataset, digital versions of mapped areas providing complete coverage of the Calgary-Lethbridge Corridor at 1:50 000 scale were combined in one GIS dataset. The data were processed as follows:
1. All source map legend information (schema) was reclassified into a uniform legend;
2. Inconsistencies along map area boundaries were resolved;
3. Polygon boundaries and attributes were compared against digital version of smaller scale maps (1:500 000 and 1:1 000 000 scale), and maps for which no digital versions were available, and modified as necessary;
4. Polygon boundaries were modified to agree with the surface topography as represented by the Alberta Environment and Parks (AEP) DEM where necessary;
5. The appended feature class was exported as an Esri shapefile for public distribution using ArcGIS software.