![]() ![]() As soon as a full boundary is created, the land size in square feet and the square meters will be shown below.įor precision, you should drop lots of points to cover every curve in the land. You must fully create a boundary using these points until you reach the starting point again and click on it. 9,000 km should leave.You can use left-click to drop more points in order to create a boundary. However in the calculation it leaves a big mistake compared to Google maps. We're going to make in the code found in the official tutorial App inventor, although we note that a very wrong result compared with Haversine code seen above is obtained. Let's calculate the distance on the sphere two points that we know its latitude and longitude. _ _Ĥ6E.- Calculating the distance between two points on the earth. Within the block " Do - result" in addition to mathematical operations, you can also be entered character string operations and properties of the components. Have you seen the way to introduce local variables and instructions within the block " Do - result ". I'm commenting on the Procedures with result, this code actually could have been done perfectly and without using processes more simply, the aim of using this algorithm is simply discuss how to introduce statements within a procedure. there 's a part in that expression, the arc-sine, where the angle in radians must be obtained to be able to multiply by 2 and by 6371, so that after calculating the arc-sine (obtained in degrees), we must move that number of degrees to radians, use the block for that: convert degrees to radians. ) are made in degrees, so we will not change to radians, we'll operations in degrees. In App inventor trigonometric operations (sine, cosine, tangent. ) trigonometric functions are in radians. In most internet tutorials you will read that the longitude and latitude must be entered in radians, that's because in most programming languages (Java, C. To facilitate the parties code breast squared I have called X and Y The formula Haversine to calculate the distance between two points on the earth knowing the latitude and longitude is: ![]() I'm commenting on the Procedures with result, this code actually could have been done perfectly and without using processes more simply, the aim of using this algorithm is simply present way of introducing instructions within a Procedure. Let's create our own code using the formula Haversine. ![]() One with the 46D formula Haversine and more accurate result andĪnother the 46E (obtained from App Inventor tutorials) worst result.Ĥ6D- Calculating the distance between two points Haversine. The expression often used to calculate two points on the spherical surface is the formula Haversine:ĭ = acos (without Φ1 Φ2 + cos without Φ1 Φ2 cos cos Δλ) R Being a sphere we can not use the expression to calculate the distance between two points on a plane, as we did in the previous tutorial. The average radius is taken into 6371.0 km. The terrestrial radio in Ecuador is 6378.1 km, in the Polo is 6356.8 km. Keep in mind that the earth is spherical in shape. This is calculate the distance between two points on the earth to know the longitude and latitude of each. To measure distances on the map of Google, click on a point with the right mouse button and then "Make Measurement" Calculation of the distance in kilometers between two points on the earth. In principle to put instructions in the Procedure with result, we use the Block: Do a result, found in the part of Control Let's see another Procedure whit Result. Distance between two points in the earth. Nuevo concurso para España, Argentina, Brasil, Chile, Colombia, Ecuador, México, Perú y Portugal.īy App Inventor 2 - Juan Antonio VillalpandoĤ6D.- Procedures with Result (III). ![]()
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