An enumeration to describe the sampling mode of a raster.
Area-based sampling implies that the value of the pixel is valid for the entire area of the pixel. Typically this type of sampling is used for satellite imagery, where a pixel typically contains an averaged color value for the entire region of the pixel.
Point-based sampling implies that each pixel value of the raster has valid data at its center position. Typically this type of sampling is used for elevation data, where exact measurements are made for a grid of points, but not the values in between the pixels.