The National Topographic System (NTS)

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Presentation transcript:

The National Topographic System (NTS) http://atlas.gc.ca/site/english/toporama/index.html (NE corner of BC)

Use of NTS maps and data Base mapping for all Canada Background for general and thematic mapping Base map for mobile applications e.g. GPS Digital data for GIS analysis and mapping

National topographic map series 1906: Early twentieth century 1:63,360 1” to 1 mile 1:126,720 1” to 2 miles 1:190,080 1” to 3 miles 1925: Design of NTS 1:50,000 1cm to 0.5 km 1:250,000 1cm to 2.5 km Metric in full use after 1945 1947: Mission to complete mapping of Canada at the two scales …..enabled by post-war aerial photography (completed 2012) 1995: greater focus on providing data than printing maps

Canada is divided into 1:1,000,000 sheets, 8 ° longitude x 4 ° latitude, completed 1960

1:1,000,000 maps are divided into (16) 1:250,000 sheets (2 x 1 degree), completed 1970

The National Topographic System (NTS) Coordinate grid squares every 10km on a printed 1:250,000 map sheet

… then into 16 x 1:50,000 (A-P), provinces complete ~1994 (not the Territories)

Prince George Map sheet / tile 93G015 2000 printed / scanned

Zoom online into 1:50,000 map detail http://atlas. gc The National Topographic DataBase (NTDB) is the digital equivalent of the printed maps - download from Http://www.geogratis.ca

The last ‘map spike’ 2012: NTS 1:50,000 059H12 Pyramid Peak Sept 2010

Declination: difference between true and magnetic north There are 3 ‘Norths’ The compass points to the magnetic north pole, not the 'true' north pole or grid north The difference between magnetic north and true north is the declination This map shows lines of equal declination (isogones)

The location of the magnetic north pole, by date the magnetic north pole left Canada in 2005, heading NW towards Siberia, at 40km / year

1:1,000,000 aeronautical maps

1:500,000 aeronautical maps

BC: Canada’s most mountainous province TRIM (Terrain Resource Inventory Management) provincial mapping started in 1980, completed by 1995

Based on NTS Each 1:250 000 is 1 degree latitude by 2 degrees longitude. Subdivided into 100 TRIM tiles mapped at 1:20,000 Total # map tiles = 7027

Each (NTS) 1:250,000 sheet is divided into 100 TRIM map ‘tiles’ e. g Each (NTS) 1:250,000 sheet is divided into 100 TRIM map ‘tiles’ e.g. if this is sheet 93G, the tile in bold is 93G023 Each 1:20 000 TRIM sheet is 6’ latitude by 12’ longitude. BC printed 1:20,000 maps (all 7027) are available from www.canadamapstore.ca

Topographic map and data summary NTS Printed maps are in the Weller Library (and some in GIS Lab) Can be ordered online, not available at stores in PG Online scanned maps and map layers are at: http://geogratis.ca/ Map viewer: http://atlas.gc.ca/site/english/toporama/index.html BC TRIM data are downloadable from GeoBC and the GIS Lab GeoBC – by area of interest; GIS Lab by mapsheet NTS and TRIM maps are available for GPS / mobiles Scanned maps, and digital map layers are available for many countries

Topographic map and data – other countries http://www.topomap.co.nz/ http://kart.statkart.no

Topographic map and data – other countries