20220311 17444600 1.0 FALSE Irrigation_wCropSoil 002 Geographic GCS_WGS_1984 Angular Unit: Degree (0.017453) <GeographicCoordinateSystem xsi:type='typens:GeographicCoordinateSystem' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xmlns:xs='http://www.w3.org/2001/XMLSchema' xmlns:typens='http://www.esri.com/schemas/ArcGIS/2.4.0'><WKT>GEOGCS[&quot;GCS_WGS_1984&quot;,DATUM[&quot;D_WGS_1984&quot;,SPHEROID[&quot;WGS_1984&quot;,6378137.0,298.257223563]],PRIMEM[&quot;Greenwich&quot;,0.0],UNIT[&quot;Degree&quot;,0.0174532925199433]],VERTCS[&quot;EGM96_Geoid&quot;,VDATUM[&quot;EGM96_Geoid&quot;],PARAMETER[&quot;Vertical_Shift&quot;,0.0],PARAMETER[&quot;Direction&quot;,1.0],UNIT[&quot;Meter&quot;,1.0]]</WKT><XOrigin>-400</XOrigin><YOrigin>-400</YOrigin><XYScale>999996364.55916667</XYScale><ZOrigin>-100000</ZOrigin><ZScale>10000</ZScale><MOrigin>-100000</MOrigin><MScale>10000</MScale><XYTolerance>8.9831546267420293e-09</XYTolerance><ZTolerance>0.001</ZTolerance><MTolerance>0.001</MTolerance><HighPrecision>true</HighPrecision><LeftLongitude>-180</LeftLongitude><WKID>4326</WKID><LatestWKID>4326</LatestWKID><VCSWKID>5773</VCSWKID><LatestVCSWKID>5773</LatestVCSWKID></GeographicCoordinateSystem> 20211020 14164200 20220211 11074200 150000000 5000 FGDC Esri ArcGIS 12.4.2.19948 Pivot Area Centroids Tracy DeLiberty University of Delaware Associate Professor Newark Delaware 19716-1304 302-831-8062 Kevin Brinson Center for Environmental Monitoring and Analysis Associate State Climatologist and DEOS Director Newark Delaware 19716 302-831-2294 2021-07-06T00:00:00 Delaware Department of Natural Resources and Environmental Control (DNREC) The Richards and Robbins Building | Dover, DE 19901 Center for Environmental Monitoring & Analysis (CEMA); Department of Geography & Spatial Sciences University of Delaware | Newark, DE 19716-2541 Pivot Areas Pivots irrigated areas crop circles UD DNREC Digitized fields date back to a 2011 dataset from the University of Delaware that was used in the Northern Atlantic Coastal Plane Center Pivot Irrigation areas. Please see https://pubs.usgs.gov/ds/0932/report.html for more information. 2011-12-31T00:00:00 1 75.00 75.80 38.45 39.80 Centroids of the Irrigated Areas polygon layer. <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN STYLE="font-style:italic;">The Pivot Area Centroids feature class is the result of </SPAN><SPAN STYLE="font-style:italic;">a collaborative mapping effort by the University of Delaware (UD) and Delaware Department of Natural Resources and Environmental Control (DNREC) for Irrigated Areas in Delaware. Irrigated Areas is a baseline of irrigated fields in Delaware that DNREC will continue to build on as new well permits are issued for irrigation systems. The Pivot Area Centroids are used to create the circle polygon features within the Irrigated Areas layer. </SPAN></P></DIV></DIV></DIV> File Geodatabase Feature Class dataset EPSG 6.14(3.0.1) 0 Simple FALSE 0 TRUE FALSE 20220211 Sharon Ungerer Delaware Department of Natural Resources and Environmental Control GIS Specialist 89 Kings Hwy Dover Delaware 19901 302-739-9945 Pivot Area Centroids are part of the Irrigated Areas layer development. The Irrigated Areas polygon feature class is the result of a collaborative mapping effort by the University of Delaware (UD) and Delaware Department of Natural Resources and Environmental Control (DNREC). Irrigated Areas is a baseline of irrigated fields in Delaware that DNREC will continue to build on as new well permits are issued for irrigation systems. James Adkins (UD) created the two coverages one from 2011 and another from 2018. The 2011 dataset aligns with the fields used in the Northern Atlantic Coastal Plain research by U.S. Geological Survey, University of Delaware Agricultural Extension that was previously available on FirstMap as the Center Pivot Irrigation layer (see https://pubs.usgs.gov/ds/0932/report.html for more information). The 2018 dataset added new irrigated fields and any irrigated fields that replaced older fields. The 2018 dataset had two types of geometry - lines and polygons. For irrigated fields that were circle shaped (i.e., crop circles), a polygon was created. If the fields were "pies" or corners of fields then lines and arcs were used to create the shape. In Sussex, irrigated areas not perfectly circular or pie-shape (i.e. drip irrigation fields) were shaped as polygons. However, perfect circles in Sussex were lines. In New Castle County and Kent all areas were lines. Google Earth was used to digitize the shapes. James Adkins shared this data with Tracy DeLiberty (UD) for processing. Updates were made by Tracy DeLiberty in ArcGIS desktop software and QGIS to account for overlapping fields and create uniform geometry of irrigated areas throughout Delaware. If a 2018 field overlapped 50% (or more) of an older field, then the 2018 field is a replacement was used and the 2011 field removed. Finally, Sharon Ungerer (DNREC) combined both updated polygons from 2018 and 2011. Sharon Ungerer removed all attributes except those that will be maintained by DNREC moving forward. Sharon Ungerer and other DNREC staff working in the Water Allocations program will continue to digitize fields and maintain the Irrigated Areas coverage.