I needed this answer, too, so for posterity:
You need to get the field object:
$map_object = get_field_object('your_map_field_name');
That will give you all the field settings. e.g. print_r($map_object):
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 (
[0] => 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.
