There is a debate going on in the comment section, where some argue Pica has a height of over 1km, to approximately 1,5km. Calculations that are trying to prove that Zoro's ISDS is in the Megaton or Gigaton range or whatever. Thus, I represent why Pica's height is no more than 360m. Doing it in a Thread because the text is way too long.
This is the height of the Colosseum:
The plaza Pica stands right before, has exactly twice the height:
And that plaza makes up half of Pica's height. Now tell me do you think that 2 Colosseums stacked on top of each other have the height of Burj Khalifa (800m)?
Let's go a step further. In the background of the pica image you see the walls of Dressrosa, which I marked in green and which have at least half the height of pica.
How tall are these walls? We can tell exactly. We know that a marineship has a length of ~60m since Oars Jr.'s official height is 60m and his height was = marine ships length.
Here we see a marine battleship right next to the walls:
Stacked on top of each other, the walls have a height of 2,5 battleships. Let's be generous and say 3 battleships, since a small part of the wall to the left of the picture is cut off, which ought to be small given that we see the full height of the wall as we go to the right side of the wall in the picture. That makes them 3*60m=180m tall. And since the walls are no less then half of Pica's height, it makes Pica no more than 360m tall.
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