In the raster dataset, a zone is a class of elements represented by one or more cells that are connected or disconnected and that have the same value. The LandUse layer has zones or types of parcels, such as Arable, Pasture, Forest, and so on.
The Arable zone with the cell value 11 has a lot of disconnected areas or regions. A region is a group of connected cells having the same value. A zone is composed of one or more regions.
In this recipe, you will generalize the LandUse_2015 raster. The generalization process will change the values of the small-region areas to the values of the larger neighbor regions. The parcels with area below 625 meters square are not represented in a classic topographic map at scale 1:5,000. On the sheet map, this polygon area means a square of 5 millimeters. The LandUse_2015 raster has a cell size of 0.5 meters. For this reason, you will dissolve the regions smaller than 50 x 50 = 2500 cells.
The roads, rivers, and build-up areas...