Using bash-Linux read time_of_interest read distance_max (km) $3 and $4 =Latitude and longitude in degrees script: awk -v distance_max=$distance_max 'if ($3 =$3-distance_max && $4 =$4-distance_max)

Using bash-Linux

read time_of_interest

read distance_max (km)

$3 and $4 =Latitude and longitude in degrees

script:

awk -v distance_max="$distance_max" 'if ($3<=$3+distance_max && $3>=$3-distance_max && $4<=$4+distance_max && $4>=$4-distance_max) {printf "%s %s %s %s %s %s", $1,$2,$3,$4,$5,$6}' ${myfile} > ${myfile_out}

But I have to make the latitude and Longitude in km?? How.?

thank you in advance