Roche Lake Ontario. 1:50,000. Map Sheet 042G04, ed. 2, 1979

This is a georeferenced raster image of a printed paper map of the Roche Lake, Ontario region (Sheet No. 042G04), published in 1979. It is the second edition in a series of maps, which show both natural and man-made features such as relief, spot heights, administrative boundaries, secondary and side roads, railways, trails, wooded areas, waterways including lakes, rivers, streams and rapids, bridges, buildings, mills, power lines, terrain, and land formations. This map was published in 1979 and the information on the map is current as of 1977. Maps were produced by Natural Resources Canada (NRCan) and it's preceding agencies, in partnership with other government agencies. Please note: image / survey capture dates can span several years, and some details may have been updated later than others. Please consult individual map sheets for detailed production information, which can be found in the bottom left hand corner. Original maps were digitally scanned by McGill Libraries in partnership with Canadiana.org, and georeferencing for the maps was provided by the University of Toronto Libraries and Eastview Corporation.

本数据集为安大略省罗奇湖（Roche Lake）区域印刷纸质地图的地理参考栅格影像（图幅编号：042G04），于1979年发布。该地图为系列地图的第二版，完整呈现自然与人工地物要素，涵盖地形起伏、高程点、行政边界、次要道路与支路、铁路、步道、林区、包含湖泊、河流、溪流及急流在内的水道、桥梁、建筑物、磨坊、输电线、地形及地表形态。本地图于1979年正式发布，但其所载信息的现势性截至1977年。该地图由加拿大自然资源部（Natural Resources Canada, NRCan）及其前身机构联合其他政府机构合作编制。请注意：影像采集与外业测量的周期可能跨越数年，部分细节的更新时序存在先后差异。如需获取详细编制信息，请查阅对应地图幅面左下角的标注内容。原始地图由麦吉尔大学图书馆与Canadiana.org合作完成数字化扫描，地图的地理配准工作由多伦多大学图书馆及Eastview Corporation提供技术支持。