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Understanding Distance Calculators Distance calculators are instruments that calculate the distance that separates two or more 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 this isn’t fruitful, a search will be done using Google Maps API GlocalSearch. If also unsuccessful, you will be asked to pinpoint the location of the place by clicking on the map. This will allow you determine the distance between the two points, and the location will be saved in the internal database so that it can be located when someone searches for it in the future.
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As soon as a result is returned, you can get the URL so you can use it as a permanent link back to the page for your own reference, or to give it to other people who may 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 used by any geoprocessing tool that calculates distance. Input data in an equidistance projected coordinate system lead to the most accurate distance measurements. Although distance calculations can always be done no matter the coordinate system used, the results can be inaccurate or even insignificant when data is in a geographic coordinate system or a wrongly selected projected coordinate system. Key Considerations Several features can be equally closest to another feature. In this case, any of the equally closest features will be picked randomly as the closest. A feature that contains or is contained another feature has a distance of zero. Two features with at least one x,y coordinate shared, will have a distance of zero. Thus, distance is zero when between two overlapping, intersecting, touching or crossing features. Always, distance is calculated to the outer edges of a polygon feature, and not 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. Whichever of two features (of any kind) is being measured to and from, their distance is always the same. 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 between two points is the straight line that connects the points. Second, point-to-line distance can be the perpendicular or the closest vertex. Finally, determining the distance between polylines are segment vertices.