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A type of the Lot and Block system is frequently used for tax identification purposes in the United States. This designation, often called a Tax Identification Number or Tax Parcel Number, is not directly based on the legal description of the property. The system can be used even if the property is not legally described by the Block and Lot system.
More specifically, all north–south running lines (all range lines and half of all section lines), as with the prime meridian, are always established with reference to true, geodetic north. But it is a physical impossibility to meet this condition and still maintain a rectangular land grid, because such lines converge on the north pole.
The primary grid pattern is of quarter sections (1 ⁄ 2 mi × 1 ⁄ 2 mi (800 m × 800 m)). In U.S. land surveying under the Public Land Survey System (PLSS), a section is an area nominally one square mile (2.6 square kilometers), containing 640 acres (260 hectares), with 36 sections making up one survey township on a rectangular grid. [1]
Figure 1. This BLM map depicts the principal meridians and baselines used for surveying states (colored) in the PLSS. The following are the principal and guide meridians and base lines of the United States, with the year established and a brief summary of what areas' land surveys are based on each.
Section of topographical map of Nablus area with contour lines at 100-meter intervals. Heights are colour-coded. Heights are colour-coded. In modern mapping, a topographic map or topographic sheet is a type of map characterized by large- scale detail and quantitative representation of relief features, usually using contour lines (connecting ...
Blocks (groups of joined or non-joined subdivided surveyed land) are not restricted to rectangles or squares but based on survey layouts and individual property bounds. Original block lines were drawn before any official boundaries were created. Tracts, found within blocks, are special categories. Neither blocks nor tracts obey county lines.
Cadastral map from 1827 in Austria (Franziszeischer Kataster ) A modern cadastral map for Eastern England. A cadastre or cadaster (/ k ə ˈ d æ s t ə r / kə-DAS-tər) is a comprehensive recording of the real estate or real property's metes-and-bounds of a country. [1] [2] Often it is represented graphically in a cadastral map.
Other grid lines establish a local "grid north", which will differ from true north by a small amount. The amount of this deviation, which is indicated on USGS topographic maps, is typically much less than the magnetic declination (between true north and magnetic north), and is small enough that it can be disregarded in most land navigation ...