This report describes the initial, or pre-field, phase of the terrain stability mapping done for Blocks B and C of TFL 49, an area that encompasses 58,258 ha at the northern end of the tree farm licence, located on the Thompson Plateau, to the west of the north end of Okanagan Lake. · Tasks completed for this initial phase were: acquisition of a set of aerial photographs for Block C (photos for Block B were already in place); review of existing background information and earlier mapping and ensuring that the terrain stability mapping criteria for this project would be consistent with that of other projects in the area; pre-typing of aerial photographs, with the focus on the steeper ground where field work should be concentrated; and initiation of the GIS set-up, including acquisition and preparation of TRIM files and controlling the aerial photos to the TRIM digital elevation model in preparation for the monorestitution line-transfer process. · A summary of the physiography and geomorphic history of the region and a discussion of some specific features of the terrain geology and terrain stability conditions that were identified in TFL B and C are presented. A few scanned images of the typed aerial photos are inserted to demonstrate the level of pre-field mapping that was done and to show some representative examples of the terrain of the area. · A proposed work plan, with tentative schedule and budget, to complete the terrain stability mapping for Blocks B and C of TFL 49, is presented.
prepared by Denny Maynard.