Beaches in Ecoregion 6e6 and 7e5 Plages dans les écorégions 6E6 et 7E5

Data Format(s): geodatabase

Coordinate system: NAD27 (EPSG:4267)

Abstract:
The Southern Ontario Land Resource Information System did not digitize beaches. Beaches were digitized by Austin Troy from Google Earth (no topology with SOLRIS) in order to support the development of ecological services estimates for the report Estimating Ecosystem Services in Southern Ontario by Spatial Informatics Group, Austin Troy & Ken Bagstad (2009). Two classes of beaches are distinguished, those with infrastructure and those without. 62. Beach near structure (not present in SOLRIS): Class description: Open sandy beach along the shore of a great lake, within approximately 200 meters of a structure. Methods: 1) selected ecodistricts for the case study. 2)Created a 1 km buffer of those ecodistricts to account for the fact that many of the mapped beaches would be located outside the boundaries of those ecodistricts, which are designed to be at or near the shoreline. 3) Clipped the region-wide land classification map described in this document to those buffered regions. Hence, some area designated as great lake nearshore was included in the clipped output. 4)Ecodistricts were exported to Google Earth for overlay. 5) All beaches were then digitized in Google Earth. Beaches near structures were stored with a different file name prefix than those that were not near structure (the vast majority of beaches fell in the near-structure categoryonly those in designated parks did not). The resulting KML files were imported to ArcGIS as a single geodatabase file. 6 )A new code was created for each polygon designating whether the polygon was near or not-near a structure. 7)The resulting polygon layer was then unioned (where all geometry is combined) with the buffered ecodistricts layer. 8) The resulting unioned layer was converted to raster, using the beach code as the gridcode. Because of the narrowness of many beaches, the output raster cell size was designated as 7.5 meters, or half the dimensional distance of a SOLRIS pixel. 9)The clipped classification map (step 3, above), was then updated using the Conditional function in order to recode all pixels that overlaid a beach. 63. Beach (not present in SOLRIS): Class description: Open sandy beach along the shore of a great lake, not within 200 meters of a structure. Methods: See class 62 above