create a shortcode for embedding google map in a page

by 

function bartag_func( $atts ) {
$atts = shortcode_atts( array(
    'latitude' => '28.66', // default value
    'longitude' => '99.25' // default value
), $atts, 'bartag' );

return <div class="" latitude=" '.$atts['latitude'].' " longitude=" '.$atts['longitude'].' "></div>'; 
} 

add_shortcode( 'bartag', 'bartag_func' );

Now you can use shortcode like : 

[bartag latitude="12.34" latitude="12.34"]

will return :

<div class="" latitude="12.34" longitude="12.34"></div>

https://codex.wordpress.org/Function_Reference/add_shortcode#Examples