MySQL convert Degree, Minutes, Seconds to Degree decimal - mysql

Question

I have multiple rows of Degrees Minutes Seconds that I need to convert with a query.
36°19'11.46" N = 36.31985
95°36'02.22" W = 95.600617
Each row is going to be different. I've been stuck on this for two days. Is this even possible?

Answer 1

Nice lifehack: reverse problem solution (degree to DMS) using SEC_TO_TIME built-in MySQL function:
CREATE FUNCTION `geocoords`(lon double, lat double) RETURNS varchar(24) CHARSET cp1251
NO SQL
DETERMINISTIC
begin
declare alon double;
declare alat double;
declare slon varchar(12);
declare slat varchar(12);
set alon = abs(lon);
set alat = abs(lat);
set slon = TIME_FORMAT(SEC_TO_TIME(alon*3600), '%H°%i''%s"');
set slat = TIME_FORMAT(SEC_TO_TIME(alat*3600), '%H°%i''%s"');
if lon>0 then
set slon = concat(slon, 'E');
elseif lon<0 then
set slon = concat(slon, 'W');
end if;
if lat>0 then
set slat = concat(slat, 'N');
elseif lat<0 then
set slat = concat(slat, 'S');
end if;
return concat(slat, ' ', slon);
end
SELECT geocoords(30.550157546997, 50.344024658203)
50°20'38"N 30°33'01"E

Answer 2

The following should work:
SELECT D + M/60 + S/3600;
For example, in MySQL:
SELECT 36 + 19/60 + 11.46/3600;
returns: 36.319850

Answer 3

I ended up building this, and it worked flawlessly with what I needed. You will note that I added a C to the numbers, this is to flag them, so if it had already been converted it wouldn't continue to convert.
UPDATE
MasterTable
SET
MasterTable.Latitude_A = MasterTable.Latitude,
MasterTable.Longitude_A = MasterTable.Longitude
WHERE
ProjectID = 'ProjectAlpha'
and Sequence = '0'
and MasterTable.Latitude NOT LIKE '%C%'
and MasterTable.Longitude NOT LIKE '%C%';
TRUNCATE TABLE gpsconvert;
INSERT into gpsconvert(gpsconvert.`Account Number`,gpsconvert.Latitude,gpsconvert.Longitude)
SELECT
MasterTable.AccountNumber,
MasterTable.Latitude,
MasterTable.Longitude
FROM
MasterTable
WHERE
MasterTable.ProjectID = 'ProjectAlpha'
and MasterTable.Sequence = '0'
and MasterTable.Latitude NOT LIKE '%c%'
and MasterTable.Longitude NOT LIKE '%c%'
and MasterTable.Latitude <> ''
and MasterTable.Longitude <> '';
UPDATE
gpsconvert
SET
gpsconvert.LatDegree = LEFT(gpsconvert.Latitude,2),
gpsconvert.LatMinutes = SUBSTRING(gpsconvert.Latitude,-7,2),
gpsconvert.LatSeconds = SUBSTRING(gpsconvert.latitude,-5,5),
gpsconvert.LatDecimal = gpsconvert.LatDegree + (gpsconvert.LatMinutes/60) + (gpsconvert.LatSeconds/3600),
gpsconvert.LongDegree = LEFT(gpsconvert.Longitude,2),
gpsconvert.LongMinutes = SUBSTRING(gpsconvert.Longitude,-7,2),
gpsconvert.LongSeconds = SUBSTRING(gpsconvert.Longitude,-5,5),
gpsconvert.LongDecimal = gpsconvert.LongDegree + (gpsconvert.LongMinutes/60) + (gpsconvert.LongSeconds/3600);
UPDATE
MasterTable
INNER JOIN
gpsconvert on gpsconvert.`Account Number` = MasterTable.AccountNumber
SET
MasterTable.Latitude = CONCAT(gpsconvert.LatDecimal,'c'),
MasterTable.Longitude = CONCAT(gpsconvert.LongDecimal,'c')
WHERE
MasterTable.ProjectID = 'ProjectAlpha'
and MasterTable.Sequence = '0'
and MasterTable.AccountNumber = gpsconvert.`Account Number`

Answer 4

This converts strings in the form 21°48'6.384" to decimal
CREATE FUNCTION database.DMS_TO_DECIMAL(dms varchar(20))
RETURNS decimal(12,9)
BEGIN
DECLARE deg decimal(12,9);
DECLARE mins decimal(12,9);
DECLARE secs decimal(12,9);
SET deg = CAST( SUBSTRING_INDEX(dms, '°', 1) AS decimal(12,9));
SET mins = CAST( (SUBSTR(dms, POSITION('°' IN dms) + 1, POSITION("'" IN dms) - POSITION('°' IN dms) - 1)) AS decimal(12,9));
SET secs = CAST( (SUBSTR(dms, POSITION("'" IN dms) + 1, POSITION("\"" IN dms) - POSITION("'" IN dms) - 1)) AS decimal(12,9));
RETURN deg + mins/60 + secs/3600;
END

Answer 5

Add orientation (W/S):
DROP FUNCTION IF EXISTS `DmsToDecimal`;
DELIMITER $$
CREATE FUNCTION `DmsToDecimal`(`dms` VARCHAR(50))
RETURNS DECIMAL(12,9)
DETERMINISTIC
NO SQL
SQL SECURITY INVOKER
BEGIN
DECLARE deg decimal(12,9);
DECLARE mins decimal(12,9);
DECLARE secs decimal(12,9);
DECLARE sign integer;
SET dms = UPPER(TRIM(REPLACE(dms, ",", ".")));
SET deg = CAST( SUBSTRING_INDEX(dms, '°', 1) AS decimal(12,9));
SET mins = CAST( (SUBSTR(dms, POSITION('°' IN dms) + 1, POSITION("'" IN dms) - POSITION("°" IN dms) - 1)) AS decimal(12,9));
SET secs = CAST( (SUBSTR(dms, POSITION("'" IN dms) + 1, POSITION("""" IN dms) - POSITION("'" IN dms) - 1)) AS decimal(12,9));
SET sign = 1 - 2 * (RIGHT(dms, 1) = "W" OR RIGHT(dms, 1) = "S";
RETURN sign * (deg + mins / 60 + secs / 3600);
END$$
DELIMITER ;