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The National Topographic System or NTS is the system used by
The subdivision scheme that the National Topographic System uses is known as the ''National Tiling System'', which also functions as a coarse method of geocoding. This scheme initially splits the country into three major "zones", each spanning a different range of latitudes. The "Southern zone" covers latitudes between 40°N and 68°N, the "Arctic zone" covers latitudes between 68°N and 80°N, and the "High Arctic zone" covers latitudes between 80°N and 88°N. The National Tiling System is capable of covering all points with latitudes ranging from 40°N to 80°N and longitudes from 48°W to 144°W, as well as all points with latitudes ranging from 80°N to 88°N and longitudes from 56°W to 136°W.
Each National Tiling System zone is divided into individual 1:1,000,000 scale "map series", denoted by a number indicating its general position in the country (e.g., 30); which each map series divided into several 1:250,000 scale "map areas", denoted by a letter (e.g., M); and each map area divided into 1:50,000 scale "map sheets", denoted by a number (e.g., 13). These numbers and letters are then combined to form a unique designator for a map sheet, in this case, , identifying a map sheet which includes the city of Vaughan, Ontario. Some map sheets are further sub-divided at their central meridian into two 1:50,000 scale "half-sheets", with an E or W appended onto the map sheet designator.
All map series span four degrees of latitude, but each spans a different range of longitudes depending on the zone it is located in. Map series in the Southern and Arctic zones span eight degrees of longitude, while those in the High Arctic zone span sixteen degrees of longitude. In the Southern and Arctic zones, the National Tiling System numbers map series by latitude and longitude. After padding a map series number to three digits using leading zeroes, the last digit in a map series number indicates a specific range of latitudes, and the number formed by the other digits indicates a specific range of longitudes. In the High Arctic zone, map series numbers are three digits, with the first two digits of each number inherited from the two map series in the Arctic zone immediately to the south.
In the Southern zone, map series are divided into sixteen map areas, each assigned a letter from A through P, while in the Arctic and High Arctic zones, they are split into eight map areas, each assigned a letter from A through H. The letters are assigned in a Indexes of the National Topographic System of Canada
- See "Indexes in PDF format"
The National Topographic System
{{Geocoding-systems Geography of Canada Map series Map series of Canada Topography Land surveying systems
Natural Resources Canada
Natural Resources Canada (NRCan; french: Ressources naturelles Canada; french: RNCan, label=none)Natural Resources Canada is the applied title under the Federal Identity Program; the legal title is Department of Natural Resources (). is the dep ...
for providing general purpose topographic
Topography is the study of the forms and features of land surfaces. The topography of an area may refer to the land forms and features themselves, or a description or depiction in maps.
Topography is a field of geoscience and planetary scie ...
maps of the country. NTS maps are available in a variety of scales, the standard being 1:50,000 and 1:250,000 scales. The maps provide details on landforms and terrain, lakes and rivers, forested areas, administrative zones, populated areas, roads and railways, as well as other man-made features. These maps are currently used by all levels of government and industry for forest fire
A wildfire, forest fire, bushfire, wildland fire or rural fire is an unplanned, uncontrolled and unpredictable fire in an area of combustible vegetation. Depending on the type of vegetation present, a wildfire may be more specifically identi ...
and flood control
Flood control methods are used to reduce or prevent the detrimental effects of flood waters."Flood Control", MSN Encarta, 2008 (see below: Further reading). Flood relief methods are used to reduce the effects of flood waters or high water level ...
(as well as other environmental issues), depiction of crop areas, right-of-way, real estate planning, development of natural resources and highway planning. To add context, land area outside Canada is depicted on the 1:250,000 maps, but not on the 1:50,000 maps.
History
Topographic mapping in Canada was originally undertaken by many different agencies, with the Canadian Army’s Intelligence Branch forming a survey division to create a more standardized mapping system in 1904. The indexing system used today was established in 1923, and the map catalogue officially became the National Topographic System in 1926.Subdivisions
The subdivision scheme that the National Topographic System uses is known as the ''National Tiling System'', which also functions as a coarse method of geocoding. This scheme initially splits the country into three major "zones", each spanning a different range of latitudes. The "Southern zone" covers latitudes between 40°N and 68°N, the "Arctic zone" covers latitudes between 68°N and 80°N, and the "High Arctic zone" covers latitudes between 80°N and 88°N. The National Tiling System is capable of covering all points with latitudes ranging from 40°N to 80°N and longitudes from 48°W to 144°W, as well as all points with latitudes ranging from 80°N to 88°N and longitudes from 56°W to 136°W.
Each National Tiling System zone is divided into individual 1:1,000,000 scale "map series", denoted by a number indicating its general position in the country (e.g., 30); which each map series divided into several 1:250,000 scale "map areas", denoted by a letter (e.g., M); and each map area divided into 1:50,000 scale "map sheets", denoted by a number (e.g., 13). These numbers and letters are then combined to form a unique designator for a map sheet, in this case, , identifying a map sheet which includes the city of Vaughan, Ontario. Some map sheets are further sub-divided at their central meridian into two 1:50,000 scale "half-sheets", with an E or W appended onto the map sheet designator.
All map series span four degrees of latitude, but each spans a different range of longitudes depending on the zone it is located in. Map series in the Southern and Arctic zones span eight degrees of longitude, while those in the High Arctic zone span sixteen degrees of longitude. In the Southern and Arctic zones, the National Tiling System numbers map series by latitude and longitude. After padding a map series number to three digits using leading zeroes, the last digit in a map series number indicates a specific range of latitudes, and the number formed by the other digits indicates a specific range of longitudes. In the High Arctic zone, map series numbers are three digits, with the first two digits of each number inherited from the two map series in the Arctic zone immediately to the south.
In the Southern zone, map series are divided into sixteen map areas, each assigned a letter from A through P, while in the Arctic and High Arctic zones, they are split into eight map areas, each assigned a letter from A through H. The letters are assigned in a boustrophedon
Boustrophedon is a style of writing in which alternate lines of writing are reversed, with letters also written in reverse, mirror-style. This is in contrast to modern European languages, where lines always begin on the same side, usually the le ...
pattern starting with the southeasternmost map area in a series.
Each map area in turn is split into sixteen map sheets, numbered from 1 through 16 in an identical boustrophedon pattern to the map areas.
Each of these 1:50,000 sheets, in turn, was at one time split into eight 1:25,000 scale map sub-sheets, lettered as lower-case a to h, using the same boustrophedon pattern as the smaller-scale map areas and sheets. These 1:25,000 scale maps were produced from the 1960s to about 1975, then abandoned, and liquidated in the 1980s (along with the scattered coverage of the 1:500,000 and 1:125,000 scale).
Not all National Topographic System maps strictly follow the National Tiling System's linear grid. Some maps also cover land in an area which would otherwise be covered by an adjacent map sheet, simply because the latter area does not contain enough land in Canada to warrant a separate printing.- See "Indexes in PDF format"
See also
* International Map of the WorldReferences
External links
The National Topographic System
{{Geocoding-systems Geography of Canada Map series Map series of Canada Topography Land surveying systems