Natural Resources Canada提供的免费的topo map(等高线地图) 50K

lulululu
......先找出要去地方的位置是在哪一张NTS Map上(最容易的方法是看103 hikes,Bivouac等等的资料上的注明)，.....

Abstract
Topographic maps produced by Natural Resources Canada conform to the National Topographic System (NTS) of Canada. Indexes are available in three standard scales: 1:1,000,000, 1:250,000 and 1:50,000. The area covered by a given mapsheet is determined by its latitude and longitude. 1:1,000,000 mapsheets are identified by a combination of three numbers (e.g. 098). 1:250,000 mapsheets are identified by a combination of numbers, and letters ranging from A through P (e.g. 098C). Sixteen smaller segments (1 to 16) form blocks used for 1:50,000 mapping (e.g. 098C03).

Purpose
The standard NTS numbering system shown on the NTS Index Grid allows users to locate a map and determine its coverage or quickly identify adjacent maps. These data indexes can be combined with any other digital data.