TY - RPRT TI - Workflow for using unmanned aircraft systems and traditional geospatial data to delineate agricultural drainage tiles at edge-of-field sites AU - J. Jeremy Webber AU - Tanja N. Williamson PY - 2021 DO - 10.3133/sir20215013 UR - https://pubs.usgs.gov/publication/sir20215013 ID - sir20215013 ER -