1. A method for mapping water tables comprising: receiving a satellite image of an area; identifying water features on the satellite image; identifying elevations of the water features using a digital elevation model of the area; applying an interpolation algorithm to the elevations of the water features to identify water tables and elevations for the water tables, wherein applying the interpolation algorithm comprises approximating the elevation of water tables by connecting water features; subtracting, using a computer, the elevations for the water tables from a digital representation of ground surface topography or subsurface horizon to identify depths of the water tables; and displaying the depths of the water tables on the satellite image.