sentences:  He is considered to be the founder of methodical school cartography, and distinguished himself by creating his own wall maps for classroom instruction.In 1838 he produced a physical map of Asia in his ""Schulmethodischer Wand Atlas"" (Methodic Wall Atlas for Schools) that was soon followed by maps of other continents.On these maps, Sydow developed a color methodology for landscape features using hachures, where green was depicted for lowlands and brown used for highlands.