I needed this answer, too, so for posterity:
You need to get the field object:
$map_object = get_field_object('your_map_field_name');
That will give you all the field settings. e.g.
Array ( [key] => field_1234567890 [label] => Map [name] => your_map_field_name [_name] => your_map_field_name [type] => google_map [order_no] => 1 [instructions] => [required] => 0 [id] => acf-field-map [class] => google_map [conditional_logic] => Array ( [status] => 0 [rules] => Array (  => Array ( [field] => null [operator] => == ) ) [allorany] => all ) [center_lat] => [center_lng] => [zoom] => 12 [height] => 300 (there it is, yay!) [field_group] => 123 [value] => Array ( [address] => 123 Main St Anywhere USA [lat] => 12.3456789 [lng] => -123.456789 ) )
ps – just realized this is exactly one year later. weird.
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