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POSQL Calculating distance using Long/Latitude & Converting Int. to Decimal
 

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  1. POSQL Calculating distance using Long/Latitude & Converting Int. to Decimal
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    <p>Original Post: <a href="https://stackoverflow.com/questions/14653875/changing-integer-to-floating-point-and-adding-decimal-point">Changing integer to floating point and adding decimal point</a></p> <p>So here's the back story: I'm working with a database that receives GPS coordinates from vehicles and I need to figure out the mileage of those vehicles based on the Longitude and Latitude values. However, in the database both columns Longitude/Latitude are "Int/Not null" and have no decimal places. So they look like this:</p> <pre><code>Latitude Longitude 36158500 115949833 36340000 115914667 36153488 115944875 </code></pre> <p>and I need it to look like this: </p> <pre><code>Latitude Longitude 36.158500 115.949833 36.340000 115.914667 36.153488 115.944875 </code></pre> <p>With Tim Lehner's help, we figured out how to get the decimal point, but I can't use the formula I already created to figure out the mileage. I have to be able to search for the long/lat values based on the radio_name so that I can look at each vehicle's mileage individually, which is why I created a temp table called CTE and CTE2. However, the code will not work if I call the temp table because it says it's an invalid object. Now the code works fine if I plug in "AVL" (the original table's name) versus using CTE2 on my last statement below. However, the mileage isn't calculated using the new lat/long values. </p> <p>So just as a recap: the columns are Latitude, Longitude. We need to convert these columns to place a decimal point after 2 characters in latitude, and after 3 characters in longitude. Then we need a column named Miles which calculates the mileage between the latitude and longitude values given. </p> <p>Any tips, help, pointers, etc. are all greatly appreciated! Thank you! </p> <pre><code>USE [system] GO With CTE as (SELECT * FROM AVL WHERE (DATE_TIME between '01/30/2013 00:00:00' AND '01/30/2013 23:59:59') AND radio_name = 'MAS7'), CTE2 as (select *,row_number() over(partition by Vehicle_ID order by Date_Time) as RN FROM CTE) SELECT *, sqrt((69.1*(previous.Latitude - next.Latitude))* (69.1*(previous.Latitude-next.Latitude)) + (69.1*(previous.Longitude-next.Longitude)) * cos(next.Latitude/57.3) * (69.1*(previous.longitude-next.Longitude)) * cos(next.Latitude/57.3)) as Miles From CTE2 as Previous Join CTE2 as Next On previous.Vehicle_ID = Next.Vehicle_ID AND Previous.RN = Next.RN - 1 select cast(Latitude / 1000000.0 as decimal(10, 6)) as Latitude , cast(Longitude / 1000000.0 as decimal(10, 6)) as Longitude from cte2 </code></pre> <p><b>****EDIT****</b> <br> Desired outcome would look something similar to this: <br></p> <pre><code>Latitude Longitude Mileage Radio_Name 36.158500 115.949833 3.444 MAS7 36.340000 115.914667 3.443 MAS7 36.153488 115.944875 4.544 MAS7 </code></pre> <p>(That's not the correct mileage but it's just an example of what I'm looking for as the outcome.) </p>
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    1. COcould you give an example of your desired output?
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    2. COSee above please.
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