From the beginning of agriculture in that region, and later in a few other regions, agriculture diffused throughout the world. The following summary is from AMSCO AP Human Geography:Ībout 12,000 years ago, people living in Southwest Asia began to grow crops and raise animals intentionally. ⚡ Read: AP Human Geography - Unit 5 Overview As you are reviewing for this unit, focus on the key concepts! The following guide will be updated periodically with hyperlinks to excellent resources. In AP Human Geography, unit 5 covers the development and processes of agriculture including food production and rural land-use. Agriculture, Food Production, & Rural Land-Use (13-17%) An online table shows PLSS Cadastral National Spatial Data Infrastructure (CadNSDI) data set availability.Unit V. Use the "Add Data" tool at the top of the map.įor GIS users, PLSS data layers are available through the BLM’s REST service endpoint. The National Map Viewer displays "BLM Public Land Survey System (PLSS)". US Topo maps published 2013-present have a Public Land Survey System layer that can be turned on and off. US Topo maps published 2009-2012 do not include any PLSS data. PLSS was created to divide parcels of public land it is not useful for the accurate location of points and should not be confused with coordinate systems like latitude/longitude, UTM, or the State Plane Coordinate System.įor states that have Public Land Surveys:Īlmost all historical topographic maps (1884-2006) include PLSS tic marks or gridlines. Sections can be further subdivided into quarter sections, quarter-quarter sections, or irregular government lots. Townships are subdivided into 36 one-mile-square sections. The PLSS typically divides land into 6-mile-square townships. PLSS surveys, which are available for portions of land in 30 southern and western states, are made by the Bureau of Land Management (BLM). The Public Land Survey System (PLSS) is a way of subdividing and describing land in the United States.
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