You don't need a table - simple arithmetic will do. The P4P has a diagonal FOV of 84°. Assuming that your photos are full-resolution 3000 x 4000 pixels, that makes a nice 3:4:5 triangle, and so the diagonal length is 5000 pixel widths.

The distance,

*d*, on the ground covered by 84° at a height,

*h*, is simply given by:

*d* = 2*h*.tan(84/2)

and so the length on the ground per pixel,

*l*, is given by:

*l* = 2*h*.tan(84/2)/5000 = 0.00036*h*

and the dimension,

*L*, of an object that is imaged by

*p* pixels is therefore:

*L* = 0.00036*hp*

Those length quantities are valid in any units provided that they are all the same, i.e. if

*h* is in feet then

*L* is also in feet.