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.