Distance calculators are instruments that calculate the distance that separates two or more points on the map. You can the unit of distance as you prefer – meters, kilometers or miles. Usually, you can just type in the names of the places whose distance from each other you’d like to know, and then click some button to show results. Postcodes and addresses may be used as well.
How Distance Calculators Work
As you click the search button, a search will be run to locate the place you are referring to. First off, a search will be made on an internal list of usual locations. If this isn’t fruitful, a search will be done using Google Maps API GlocalSearch. If you still get no results, then you will have to click the specific location of the area on the map. This will show you the distance between the two points, and the location will also be stored in the internal database so that it can be located when somebody searches for it in the future.
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When a result has been returned, you can save the URL and use it for your own reference, or to give it to a friend or family member who may also need it.
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How Distance Is Determined
The distance that lies between any two features is determined as the shortest distance between them, that is, in which the two features are nearest each other. This logic is employed by any geoprocessing tool calculating distance.
Input data in an equidistance projected coordinate system lead to the most accurate distance measurements. Distance may always be computed no matter what coordinate system is used, but the results may not be reliable or even meaningless if the data is in a geographic coordinate system or an incorrectly selected projected coordinate system.
There may be multiple features that are equally closest to another feature. If this occurs, any of the equally closest features can be indiscriminately chosen as the closest. If one feature contains or is contained in another feature, their is zero. The distance between two features is given as zero if at least one x,y coordinate is shared between them.
Therefore, when two features cross, intersect, touch or overlap, the distance is zero. Distance is always measured to the boundary of a polygon feature, rather than to the center. As earlier noted, if a feature is contained inside a polygon, the distance between the feature and the containing polygon is calculated as zero. The distance that lies between two features of any kind, is always the same no matter which one of them is being measured to and from.
Basic Distance-finding Operations
Determining distance relies on the geometry type of the features, and also on other factors such as coordinate system. But there are three core rules for determining how distance is to be calculated. First, the distance that lies between two points is the straight line linking the points. Second, distance from a point to a line is either the closest or the perpendicular vertex. Third and last, segment vertices determine the distance between polylines.