How does PHP calculate the maximum and minimum longitude and latitude of four corners within the current coordinates of 3 kilometers?
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/ / $lng, $lat longitude and latitude $half = 6371; $distance = 3; / 3 km $dlng = 2 * asin (sin ($distance / (2 * $half)) / cos (deg2rad ($lat); $dlng = rad2deg ($dlng); $dlat = $distance / $half; $dlat = rad2deg ($dlat) $fourpoint = array ('left-top' = > array (' lat' = > $lat + $dlat, 'lng' = > $lng-$dlng),' right-top' = > array ('lat' = > $lat + $dlat,' lng' = > $lng + $dlng), 'left-bottom' = > array (' lat' = > $lat-$dlat, 'lng' = > $lng-$dlng),' right-bottom' = > array ('lat' = > $lat-$dlat,' lng' = > $lng + $dlng) The above is all the contents of the article "how PHP calculates the maximum and minimum longitudes and latitudes of four corners within the current coordinates of 3 kilometers". Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!
