Question

What type of data should I use to store Lat and Lng from Google Map into my database?
I’m not sure how many decimal place should I put for length in mysql.

So should I use Decimal, Float etc?
and how much should I put for Length?
Meanwhile, is it good to put index for Lat and Lng in Mysql?

Answer 1

I use decimal(10,6) for both lat and lon which gives you a resolution better than 1 meter. (Remember to take the minus sign into account).

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EDIT:

Quote from the MySQL manual regarding the minus sign on the decimal type:

Standard SQL requires that DECIMAL(5,2) be able to store any value with
five digits and two decimals, so values that can be stored in the
salary column range from -999.99 to 999.99. MySQL enforces this limit
as of MySQL 5.0.3. Before 5.0.3, on the positive end of the range, the
column could actually store numbers up to 9999.99. (For positive
numbers, MySQL 5.0.2 and earlier used the byte reserved for the sign
to extend the upper end of the range.)

Source:

http://dev.mysql.com/doc/refman/5.0/en/fixed-point-types.html