20250219111713001.0TRUEExtractByMask V6\Probability WBDHU8_Clip_combo \\Isas-fs1\gis\Base_map_data\Illinois\IAPM_prob.tif INSIDE "626518.29984953 4098399.80047975 978508.29984953 4717599.80047975 PROJCS["NAD_1983_UTM_Zone_15N",GEOGCS["GCS_North_American_1983",DATUM["D_North_American_1983",SPHEROID["GRS_1980",6378137.0,298.257222101]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Transverse_Mercator"],PARAMETER["False_Easting",500000.0],PARAMETER["False_Northing",0.0],PARAMETER["Central_Meridian",-93.0],PARAMETER["Scale_Factor",0.9996],PARAMETER["Latitude_Of_Origin",0.0],UNIT["Meter",1.0]]"1500000005000ItemDescriptionpredicted probability of encountering precontact site in each 90x90m grid cell generated by the Illinois Archaeological Predictive Model (IAPM) created by the Illinois State Archaeological Survey (ISAS)<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>The Illinois Archaeological Predictive Model (IAPM) is a GIS-based tool developed by the Illinois State Archaeological Survey (ISAS), part of the Prairie Research Institute at the University of Illinois at Urbana-Champaign. The model builds on over a century of archaeological work in Illinois, and considers the known locations of prehistoric Native American sites, landforms that lack archaeological sites, and other environmental and geophysical variables such as elevation, distance to rivers and streams, and native vegetation. Data sampled from these locations are analyzed via GIS (Geographic Information Systems) and fed into a TensorFlow neural network (a machine learning algorithm) to predict the probability of encountering an archaeological site in every two acre square (90 x 90 meter cells) across the state.</SPAN></P><P><SPAN>ISAS and other interested stakeholders use the IAPM to help protect, preserve, and assess the potential impact to irreplaceable and non-renewable archaeological resources within the context of Illinois’ need to encourage and promote sustainable development. Using the IAPM helps archaeologists prioritize time and resources during surveys, and allows us to make recommendations that prevent or mitigate impacts to the archaeological record. It also has the potential to enable ordinary citizens, managers, developers, and preservationists to become proactive planners when it comes to the archaeological resources of Illinois. </SPAN></P><P><SPAN>Version 3.6 of the IAPM (2025). For more information, visit https://www.isas.illinois.edu/office_of_the_illinois_state_archaeologist/illinois_archaeological_predictive_model</SPAN></P></DIV></DIV></DIV>IAPM_probabilityarchaeologyprobabilityIllinois<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>These data are distributed under a CC-BY-SA license (Attribution-ShareAlike 4.0) by the University of Illinois Board of Trustees, courtesy of the Illinois State Archaeological Survey (ISAS).</SPAN></P></DIV></DIV></DIV>20260220/9j/4AAQSkZJRgABAgEAYABgAAD/2wBDAAgGBgcGBQgHBwcJCQgKDBQNDAsLDBkSEw8UHRofHh0a HBwgJC4nICIsIxwcKDcpLDAxNDQ0Hyc5PTgyPC4zNDL/2wBDAQkJCQwLDBgNDRgyIRwhMjIyMjIy MjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjL/wAARCACFAMgDASIA AhEBAxEB/8QAHwAAAQUBAQEBAQEAAAAAAAAAAAECAwQFBgcICQoL/8QAtRAAAgEDAwIEAwUFBAQA AAF9AQIDAAQRBRIhMUEGE1FhByJxFDKBkaEII0KxwRVS0fAkM2JyggkKFhcYGRolJicoKSo0NTY3 ODk6Q0RFRkdISUpTVFVWV1hZWmNkZWZnaGlqc3R1dnd4eXqDhIWGh4iJipKTlJWWl5iZmqKjpKWm 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