This document outlines HASM-based upscaling and downscaling algorithms. It introduces the general concepts and definitions of HASM-US and HASM-DS. It describes the schematic diagrams and grid projection processes for both. The algorithms for HASM-US and HASM-DS are explained in detail. Advantages of the upscaling and downscaling methods are provided. The document concludes that HASM-based algorithms demonstrate higher accuracy than other methods for scaling surfaces of elevation, temperature, precipitation and population.