3.3.1.9.2. Import TEM data
To import time-domain electromagnetic (TEM) data, use the main project menu: There are four types of TEM data that can be loaded from files:
Import → Data → Time-domain EM
File formats:
3.3.1.9.2.1. EM1DTM format
Loads a data file for the EM1DTM inversion and forward modeling codes. The data position is set relative to the transmitter as specified by the EM1DTM file format. The function returns a TEM1Dsounding object.
Import → Data → Frequency-domain EM → GIF EM1D format
The following parameters are set for the user:
Properties:
- Transmitters:
Dipole moment: Set by argument
Orientation Set by argument
Along-line offset (m) = 0
Cross-line offset (m) = 0
Vertical offset (m): Relative to topography
- Receiver:
Dipole moment: Set by argument
Along-line offset: The along-line position of receivers, relative to transmitter locations
Cross-line offset: The cross-line position of receivers, relative to transmitter locations
Vertical offset: Relative to topography
Note
The position of the data is set by the “sounding” location. Only the relative offsets between the transmitters and receivers are available in the EM1DTM file format. Data locations have been assigned to the transmitter locations upon import for consistency.
3.3.1.9.2.2. H3DTD | TDoctree format
Loads data files formated for the H3DTD, TDoctree and TDoctree tiled codes. The function returns a TEMdata object where only the transmitter geometry is defined. The receivers are defined as point measurements that samples the fields (E, H) along the Cartesian axes.
Import → Data → Time-domain EM → GIF H3DTD | TDoctree format
Note
The TEMdata object assumes that the provided field data have been measured along the Cartesian axes or that the user has rotated the fields in pre-processing. For more general cases with arbitrary receivers orientation (in-line), consider making use of the TEM3Dsounding class.
3.3.1.9.2.3. TDoctree v2 format
Loads data specifically formatted for the TDoctree v2 code. The function returns a TEM3Dsounding object.
Import → Data → Time-domain EM → GIF TDoctree v2 format
The receivers and transmitters are defined by their respective input files. As a result, you will need 4 files when importing TDoctree v2 data:
Note
Both the transmitters and receivers geometry are defined in 3D. The relative offsets can be calculated using the Calculate Transmitter/Receiver separation function.
3.3.1.9.2.4. AMIRA TEM File
Loads data from AMIRA TEM formatted file; see reference . The the user may choose to import the data to a TEMdata or TEM3Dsounding object. To import:
Import → Data → Time-domain EM → AMIRA .TEM file
The TEM file contains one or more directional components of the measured field. If the data are imported to a TEMdata object, any missing field component will be assigned a flag value of NaN. If the data are imported to TEM3Dsounding , than an individual TEM3Dsounding object is created for each component; allowing for easier assignment of receivers.