The time-domain electromagnetic (TEM) data were collected in and near Everglades National Park. The TEM data sets contain all necessary information required for data interpretation. The data were recorded using a Geonics PROTEM receiver and EM-47 transmitter.

The data set includes the following information:

1. Sounding name

2. Date measured

3. Location information in the form of: a descriptive location, zone 17 UTM coordinates, and lattitude and longitude.

4. Transmitter loop size [meters] and location of receiver coil with respect to the center of the transmitter loop.

5. Layered-earth model best fitting the data. This includes the layer resistivity [ohm-meters] and layer thickness [meters]. Also included is the percentage rms misfit error between the observed and calculated apparent resistivity of the model.

6. Information on the measurement system including: the TEM system used, the repetition frequency [hertz] of the transmitted waveform, the data set code (Used by interpretation software to represent the repetition frequency.), the transmitter current [amperes], the length of the transmitter turnoff ramp [microseconds], the receiver coil area-turns product [turns-meters²], and the receiver gain setting. The actual receiver gain is 52.1•2^G, where G is the gain setting.

7. Apparent resistivity-time data are provided for two base frequencies: the higher base-frequency data are on the left hand side and the lower base-frequency data on the right hand side. For each frequency the following information is given:

• the time of the measurement point after transmitter turn off [milliseconds];
  
• the measured apparent resistivity [ohm-meters];
  
• the estimate measurement error [percent];
  
• a mask code which indicates if the data were used (u) in the least-squares parameter estimation, masked (m) from the parameter estimation but retained for possible inclusion in modeling, or deleted (d) from the parameter estimation because the observation error was too large;
  
• and the apparent resistivity calculated for the best-fit model.