How pilots know building clearance when flying into cities vs flatlands

Question

When you fly into somewhere like San Diego or New York, you fly right over the city and are basically directly next to skyscrapers. But when you fly into somewhere like Austin or New Orleans, you’re flying over flatlands. How do pilots know clearance for certain areas, does ground control tell them how best to land or does that not matter?

In: Other

Answer 1

Real ELI5 without industry jargon:

You use a Map that has numbers to show how high you have to fly to avoid hitting the highest building.