Understanding the Government Rectangular Survey (ATS) for the Alberta Exam

Last updated: April 2026

For aspiring real estate professionals in Alberta, understanding how land is measured, identified, and legally described is a fundamental requirement. The government rectangular survey system—officially known in this province as the Alberta Township System (ATS)—is the backbone of rural land identification. Whether you are dealing with sprawling agricultural parcels, rural acreages, or resource properties, mastering the ATS is non-negotiable. This mini-article will break down the grid system, legal land descriptions, and acreage calculations you need to know. For a broader look at your licensing journey, be sure to bookmark our Complete Alberta Real Estate Associate Exam Exam Guide.

What is the Government Rectangular Survey?

The government rectangular survey is a grid-based method of surveying and identifying land. In Western Canada, this originated as the Dominion Land Survey in the late 19th century to facilitate the settlement of the prairies. Today, under the regulatory framework of the Alberta Surveys Act and the Land Titles Act, it is referred to as the Alberta Township System (ATS).

Unlike urban environments where properties are typically identified using a "Plan, Block, and Lot" legal description (the subdivision system), rural land in Alberta relies almost entirely on the ATS. When you pull a title from the Alberta Land Titles Office (often using the SPIN2 system), the legal description of a rural property will be rooted in this grid.

The Grid: Meridians, Ranges, and Townships

To understand the ATS, you must visualize a massive grid laid over the province. This grid is defined by three primary components:

1. Meridians

Meridians are longitudinal lines running north and south. In Alberta, all land is measured west of specific meridians:

• The 4th Meridian (W4): Forms the border between Alberta and Saskatchewan (110° West).
• The 5th Meridian (W5): Runs through Stony Plain, Calgary, and Fort Macleod (114° West).
• The 6th Meridian (W6): Runs through the Peace River region (118° West).

2. Ranges

Ranges are vertical columns of land that run parallel to the meridians. They are numbered consecutively moving westward from each meridian. For example, Range 1, West of the 5th Meridian (R1 W5) is the first vertical column of land immediately west of the 5th Meridian.

3. Townships

The term "Township" has two meanings in the ATS. First, it refers to horizontal rows of land running east and west. Township lines are numbered consecutively moving northward from the Canada-U.S. border (the 49th parallel), which is Township 1. Second, "Township" refers to the specific 6-mile by 6-mile square created where a Range column intersects a Township row.

Breaking Down a Township: Sections and Acres

A single Township is a square parcel of land measuring 6 miles by 6 miles, totaling 36 square miles. This Township is further subdivided into 36 individual Sections.

Each Section is 1 mile by 1 mile (1 square mile) and contains exactly 640 acres.

The Numbering System (The Boustrophedon Pattern)

The Real Estate Council of Alberta (RECA) expects you to know how Sections are numbered within a Township. They do not read left-to-right like a book. Instead, they follow a snaking pattern:

• Section 1 is located in the bottom right (Southeast) corner of the Township.
• The numbers progress westward (left) to Section 6 in the Southwest corner.
• Section 7 is directly north of Section 6, and the numbers progress eastward (right) to Section 12.
• This back-and-forth pattern continues until it reaches Section 36 in the top right (Northeast) corner.

Subdividing a Section

Because 640 acres is a massive amount of land, Sections are usually broken down further:

• Quarter Section: 160 acres (e.g., Northwest Quarter, Southeast Quarter).
• Legal Subdivision (LSD): 40 acres. There are 16 LSDs in a section, numbered 1 to 16, starting in the SE corner and snaking upward, similar to the Section numbering.