GEO lon/lat reliable server and code needed

Currently, I am using freegeoip.net to set the geo lat/lon of a server when it starts up using a bash script.

Bash code for my function;

function get_set_geo()
{
    # Get GEO LAT/LON

    LATLON=$(wget -q -O - http://freegeoip.net/xml | awk -F'<|>' '/Latitude|Longitude/ {print $3}')

    LAT=$(cut -f1 -d" " <<< $LATLON)
    LON=$(cut -f2 -d" " <<< $LATLON)

    echo "Latitude: " $LAT
    echo "Longitude:" $LON

    $CURLSEC -F function=set_geo -F geo_lat=$LAT -F geo_lon=$LON
}

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The variable contents are stored to Mysql
geo_lat       decimal(10,8)       No       None       NULL       
geo_lon       decimal(11,8)       No       None       NULL

I was told in another question that this service is not very accurate so I would like to use another one.

I also found http://www.datasciencetoolkit.org/developerdocs#ip2coordinates which looks very interesting to me because it seems to also add the ability to use address information. I actually have address information for the server in it's database record on mysql. In other words, I could use it's current public IP and it's address to feed to this service.
The service must allow free use, even for commercial use. The server will only ever connect once to get it's geo lat/lon unless it has been moved. If it has been moved, it's db lat/lon settings will be defaulted back to 0.00000000 so the code is run again.

This is the next part of the question, I need code to complete this.

The above code connects to a php app which in turn reads/writes to the database. I need to add code to the bash function above which will check to see if lat/lon are 0.00000000. If so, then run the function, if anything else, such as it's already been set, then do not run the function and continue the script.

Currently, my code only sets and doesn't know if the lat/lon was already set. Here is the php side.

                elseif ($_POST['function'] === 'set_geo') {
                                $sql = 'UPDATE clients SET
                                geo_lat = "' . $_POST['geo_lat'] . '", geo_lon = "' . $_POST['geo_lon'] . '" WHERE id = ' . $clientid ;
                                echo "\n SQL: $sql";
                                mysql_query($sql) or die('Query failed: ' . mysql_error());
                 }

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What I need are to check the record of this clientid, see if it's lat/lon have been set. If set, those records will contain lat/lon coordinates but if not set, they will have 0.00000000 0.00000000 which means, let's set the coordinates.

NOTES
CURLSEC is a variable which contains the entire curl connection string to authenticate and communicate with php. The script already knows it's name/password.

The $clientid is determined by php so that the proper record will be chosen when the server connects to php.

In other words, authentication and figuring out which record to write to are already in the code and not needed.