In GIS (Geographic Information System) services, the preferred order of writing latitude and longitude tuples typically follows the convention of writing the latitude first, followed by the longitude. This order is commonly referred to as "Lat/Lon" or "Lat, Lon" notation.
The latitude represents the angular distance north or south of the equator and is usually written first, followed by the longitude, which represents the angular distance east or west of the Prime Meridian. The combination of latitude and longitude provides a unique geographic coordinate that can pinpoint a specific location on the Earth's surface.
For example, a latitude and longitude tuple for a location in New York City, USA, might be written as:
40.7128° N, 74.0060° W
Where "40.7128° N" represents the latitude and "74.0060° W" represents the longitude.
It's important to note that different GIS services or systems may have variations in coordinate notation or order, so it's always best to check the specific requirements or conventions of the GIS service or project you are working with to ensure proper formatting of latitude and longitude tuples.