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).

This dataset is produced for the Government of Alberta and is available to the general public. Note that the distribution contact is different for the general public than for Government of Alberta ministries. Please consult the Distribution Information of this metadata for the appropriate contact to acquire this dataset. The National Topographic System of Canada (NTS) is a national mapping reference grid defined by Natural Resources Canada (NRCan) that is based on degrees of latitude and longitude. Starting at the Prime Meridian and at the Equator, the 1:50 000 grid is formed by intersecting every 1/4 degree of the meridians with every 1/2 degrees of parallels. It can also true that the standard 1:250 000 NTS block is broken down into 16 1:50 000 blocks that a numbered south to north alternating east to west then west to east from one to 16. Each polygon in the grid is designated with a two digit number. a single letter and two additional numbers (Example 83H08). The province of Alberta is covered by 670 complete and 131 partially complete 1:50 000 NTS blocks.

The Canadian Gravity Anomaly Data Base consists of approximately 660 000 gravity observations, including 165 000 on land, acquired between 1944 and the present. The data spacing ranges from less than 1 km to over 20 km, with an average spacing between 5 and 10 km. All measurements were reduced to the IGSN71 datum. Theoretical gravity values were calculated from the Geodetic Reference System 1967 (GRS67) gravity formula. Bouguer anomalies were calculated using a vertical gravity gradient of 0.3086 mGal·m-1 and a crustal density of 2 670 kg·m-3.

This dataset is produced for the Government of Alberta and is available to the general public. Note that the distribution contact is different for the general public than for Government of Alberta ministries. Please consult the Distribution Information of this metadata for the appropriate contact to acquire this dataset. The National Topographic System of Canada (NTS) is a national mapping reference grid defined by Natural Resources Canada (NRCan) that is based on degrees of latitude and longitude. Starting at the Prime Meridian and at the equator, the 1:250 000 grid is formed by intersecting every degree of the meridians with every two degrees of parallels. Each polygon in the grid is designated with a two digit number and a single letter (Example 83H). The province of Alberta is covered by 45 complete and 17 partially complete 1:250 000 NTS blocks.

This information is used  to manage oil and gas rights on offshore Crown lands in Ontario. A grid system of blocks and tracts is used to divide the area. 1 block =  5 minute longitude by 5 minute latitude numbered area. 1 tract =  1 minute longitude by 1 minute latitude area, assigned by letters . 1 block contains 25 tracts. This product requires the use of geographic information system (GIS) software.

Index Grid for NTS 1:250,000 scale maps

British Columbia Geographic System 1:5,000 scale mapsheet grid. Each mapsheet is one fourth of a 1:10,000 mapsheet numbered 1 through 4. The neatlines were defined and created in geographic units and reprojected to BC Albers. Each of the mapsheets is 0.75 minutes (45 seconds) latitude by 1.50 minutes (90 seconds) longitude. The British Columbia Geographic System is a geographic system in which the coverage in minutes and seconds of longitude is double the coverage in minutes and seconds of latitude for sheets at all scales

Base waterbody polygon arcs are feature type, source and capture date attributed arcs that make up the boundaries of base waterbody polygons in the Base Features Hydrography geospatial dataset. These arcs were collected from conversion processes of 1:20 000, 1:50 000 and AVI Provincial mapping datasets and 1:50 000 National Topographic Data Base (NTDB).

Map indexes are grids that divide the territory into several sheets for the whole of Quebec. The use of these indexes allows the identification of a map sheet number for a specific territory at the scale of 1/2,000, 1/20,000 and 1/100,000.The cartographic indexes come from the Quebec cartographic reference system (S.Q.R.C), which divides the territory into hierarchical units and at different scales (1/100,000, 1/20,000, 1/10,000, 1/10,000, 1/10,000, 1/10,000, 1/10,000, 1/5,000, 1/5,000, 1/5,000, 1/1,000). This system is compatible with the [**National Cartographic Reference System (S.N.R.C) **] (https://ressources-naturelles.canada.ca/sciences-terre/geographie/information-topographique/cartes/9766).**This third party metadata element was translated using an automated translation tool (Amazon Translate).**

This dataset represents surface to bedrock isopach (thickness in metres) map of glacial drift for the Province of Saskatchewan at 1:1 000 000 scale.This dataset represents surface to bedrock isopach (thickness in metres) map of glacial drift at 1:1 000 000 scale. This data was created as a file geodatabase feature class and output for public distribution. **Please Note – All published Saskatchewan Geological Survey datasets, including those available through the Saskatchewan Mining and Petroleum GeoAtlas, are sourced from the Enterprise GIS Data Warehouse.  They are therefore identical and share the same refresh schedule.