Distance calculators are tools that calculate the distance that lies between at least two points on the map. You can decide on the distance unit you want to use, whether kilometers, meters or miles. You can typically just type in the names of the places whose distance you’d like to find out, and then click a button in order to get results. Postcodes and addresses could be used too.
How Distance Calculators Work
After you click the search button, a search will start to locate the place you indicated. First, an internal list of common locations will be searched. If there is no match, the Google Maps API GlocalSearch feature will now be used. 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 shortest separation between any two features is the distance between them, in which they are closest to 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. A feature that contains or is contained another feature has a distance of zero. The distance between two features is given as zero if at least one x,y coordinate is shared between them.
Thus, distance is zero when between two overlapping, intersecting, touching or crossing features. Distance is always measured to the boundary of a polygon feature, rather than to the center. As indicated earlier, if a feature is entirely inside a polygon, their distance is 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. However, three basic rules dictate how distance will be calculated. First, the distance that lies between two points is the straight line linking the points. Second, distance from one point to one line can be the perpendicular vertex or the closest vertex. Lastly, polyline distances are determined by segment vertices.