Time-domain Electromagnetic Soundings to Estimate the Extent of Saltwater Intrusion on Shelter Island, New York (2017-2018)

Twenty-six time-domain electromagnetic (TDEM) soundings were collected on Shelter Island, New York between March of 2017 and October of 2018. �Soundings were collected using the Geonics ProTEM and ABEM WalkTEM acquisition systems.�Depending on the size of the site, one of the following square-loop transmitter geometries was used: 1) 20 by 20 meter, 2) 40 by 40 meter, or 3) 100 by 100 meter. A high-frequency receiver with an effective area of 31.4 m^2 was used with the Geonics ProTEM system.�With the ABEM WalkTEM system, a central induction array was used with two square receiver loops (0.5 by 0.5 meters and 10 by 10 meters) setup within the transmitter loop;�the two receiver loops created effective receiver areas of 5 m^2 and 200 m^2, respectively.�Two to three measurements were made at each site using various time-gate scripts and the data were filtered, stacked 10 times, and averaged. �� This data release contains XML metadata, a site location map, and the raw and processed TDEM data. �