GUI Using user-inputs to search a database

Hi there,

I am in the middle of trying to create a GUI to allow the good people of Leeds (UK) to see how much power there house can generate if they were to install a wind turbine.

At present, my GUI requests the user inputs their x,y coordinates and the height they're considering the turbine at (hub height).

I have a data table which contains the power that could be generated at a very large number of coordinates and heights.

The data is arranged as columns (id, longitude, latitude, height, power).

I want the user inputs (longitude, latitude and height) to define the row and the GUI to return the corresponding power to those inputs.

It seems quite simple but I can't figure it out at all, any help would be greatly appreciated.