The type of survey used in determining the flatness or steepness of a farmland is

The type of survey used in determining the flatness or steepness of a farmland is topographical survey. This type of survey involves the measurement of both the horizontal and vertical features of a piece of land, such as its elevation, contours, and slope. It is often used to create topographic maps that can be used to analyze and plan the use of the land, such as for farming or construction. In agriculture, a topographical survey can be used to identify areas of the land that may need special attention in terms of drainage, irrigation, or erosion control, as well as to plan the layout of crops and other farm infrastructure.