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Blog By Sisense Team See Sisense in action Sign up for a Free Trial to build visual, interactive experiences. By checking this box, I agree that my contact details may be used by Sisense and its affiliates to send me news about Sisense’s products and services and other marketing communications. By clicking the Submit button below I confirm that I have read and understand Sisense's Privacy Policy and Terms of Service. Get the latest in analytics right in your inbox. By checking this box, I agree that my contact details may be used by Sisense and its affiliates to send me news about Sisense’s products and services and other marketing communications. By clicking the Submit button below I confirm that I have read and understand Sisense's Privacy Policy and Terms of Service. This month I’ve been programming quite a bit in PHP and MySQL with respect to GIS. Snooping around the net, I actually had a hard time finding some of the Geographic calculations to find the distance between two locations so I wanted to share them here. The simple way of calculating a distance between two points is using the Pythagorean formula to calculate the hypotenuse of a triangle (A² + B² = C²). This is known as the Euclidean distance. That’s an interesting start but it doesn’t apply with Geography since the distance between lines of latitude and longitude are not equal distances apart. As you get closer to the equator, lines of latitude get further apart. If you use some kind of simple triangulation equation, it may measure distance accurately in one location and terribly wrong in the other, because of the curvature of the Earth. Great Circle DistanceThe routes that are traveled long distances around the Earth are known as the Great Circle Distance. That is… the shortest distance between two points on a sphere is different than the points on a flat map. Combine that with the fact that the latitude and longitude lines aren’t equidistant… and you’ve got a difficult calculation. Here’s a fantastic video explanation of how Great Circles work. The Haversine FormulaThe distance using the curvature of the Earth is incorporated in the Haversine formula, which uses trigonometry to allow for the curvature of the earth. When you’re finding the distance between 2 places on earth (as the crow flies), a straight line is really an arc. This is applicable in air flight – have you ever looked at the actual map of flights and noticed they are arched? That’s because it’s shorter to fly in an arch between two points than directly to the location. PHP: Calculate Distance Between 2 Points of Latitude and LongitudeHere’s the PHP formula for calculating the distance between two points (along with Mile vs. Kilometer conversion) rounded to two decimal places.
The variables are:
Python: Calculate Distance Between 2 Points of Latitude and LongitudeAnyways, here’s the Python formula for calculating the distance between two points (along with Mile vs. Kilometer conversion) rounded to two decimal places. Credit to my son, Bill Karr who is a Data Scientist for OpenINSIGHTS, for the code.
The variables are:
MySQL: Retrieving All Records Within A Range By Calculating Distance In Miles Using Latitude and LongitudeIt’s also possible to use SQL to do a calculation to find all records within a specific distance. In this example, I’m going to query MyTable in MySQL to find all the records that are less than or equal to variable $distance (in Miles) to my location at $latitude and $longitude: The query for retrieving all of the records within a specific distance by calculating distance in miles between two points of latitude and longitude are:
You’ll need to customize this:
MySQL: Retrieving All Records Within A Range By Calculating Distance In Kilometers Using Latitude and LongitudeAnd here’s the SQL query using kilometers in MySQL:
You’ll need to customize this:
I utilized this code in an enterprise mapping platform that we utilized for a retail store with over 1,000 locations across North America and it worked beautifully. Microsoft SQL Server Geographic Distance: STDistanceIf you’re utilizing Microsoft SQL Server, they offer their own function, STDistance for calculating the distance between two points using the Geography data type.
Hat tip to Manash Sahoo, VP and Architect of Highbridge. What is the distance between 2 longitudes and 2 latitudes?The distance between any two adjacent latitudes is approximately 69 miles or 111 km. Latitude lines run parallel to each other. That's why the distance between them remains constant from the South to the North pole. On the other hand, longitude lines are furthest apart at the equator and meet at the poles.
What is the distance between 2 longitude?One degree of latitude equals approximately 364,000 feet (69 miles), one minute equals 6,068 feet (1.15 miles), and one-second equals 101 feet. One-degree of longitude equals 288,200 feet (54.6 miles), one minute equals 4,800 feet (0.91 mile), and one second equals 80 feet.
How do you find the distance between two latitude longitude points in Excel?Here are the formulas for degree coordinates: Cell B5: =distvincenty(B2,C2,B3,C3) Cell D5: =MOD(DEGREES(ATAN2(COS(B2*PI()/180) *SIN(B3*PI()/180)-SIN(B2*PI()/180) *COS(B3*PI()/180) *COS(C3*PI()/180-C2*PI()/180), SIN(C3*PI()/180-C2*PI()/180) *COS(B2*PI()/180)))+360,360)
How do you find the distance between two latitude longitude points in Python?You can use Uber's H3, point_dist() function to compute the spherical distance between two (lat, lng) points. We can set return unit ('km', 'm', or 'rads'). The default unit is Km.
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