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Maidenhead locators are also commonly referred to as QTH locators, grid locators or grid squares, although the "squares" are distorted on any non-equirectangular cartographic projection. Use of the terms QTH locator and QRA locator was initially discouraged, as it caused confusion with the older QRA locator system.
The user can input a central location in one of several forms - latitude/longitude, Maidenhead ("Grid") Locator, or an address or place-name - and can then choose one of three range-types within which the summits should be found: closed circle: summits within the entire circle will be found;
Maidenhead locator square "IO91", which covers part of Greater London, belongs to QRA locator square "ZL". The main squares are subdivided to 80 smaller squares, each one covering 12' by 7'30", and which are numbered from 01 to 80. The small squares are numbered from North to South and West to East. The northwest corner of the main square is ...
This template takes a pair of geographic coordinates and converts them into a Maidenhead grid square. Use: {{Coor Maidenhead|lat|lon|link}} Where: lat is latitude. lon is longitude. link, when yes, puts the grid square in a link to the list of map sources.
When the term 'grid square' is used, it can refer to a square with a side length of 10 km (6 mi), 1 km, 100 m (328 ft), 10 m or 1 m, depending on the precision of the coordinates provided. (In some cases, squares adjacent to a Grid Zone Junction (GZJ) are clipped, so polygon is a better descriptor of these areas.)
The term Grid square has multiple uses Maidenhead Locator System, a Geocode system used by radio amateurs worldwide; A 1 km 2 square defined by a National grid reference system, see Projected coordinate system#Grid reference encodings; A neighbourhood in Milton Keynes, England, see Milton Keynes#Grid roads and grid squares
A grid-based spatial index has the advantage that the structure of the index can be created first, and data added on an ongoing basis without requiring any change to the index structure; indeed, if a common grid is used by disparate data collecting and indexing activities, such indices can easily be merged from a variety of sources.
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