Q:

Is latitude/longitutude linear?

I'm trying to create a grid system three variables: upper-left.lat, upper-left.long and lower-right.lat, lower-right.long and grid-size = 100 meters. Just to be clear, the grid-size represents the width and height of each cell within the grid.
I'm trying to figure it out now is if the lat/long system is linear - depending on the upper-left and lower-right, could the cells be bigger or smaller?

A:

This won't work on the Earth's surface like it would in a Cartesian plane. As latitude takes one further from the Equator, the ratio of meters to longitude varies as the cosine of the latitude.
It is not "linear"

