Depreciated Writing SEG-Y
Warning
These methods have been depreciated in favour of an Xarray accessor method. Examples in this documentation have been updated to use the new method or consult the accessor reference.
segy_writer(seisnc, segyfile, trace_header_map=None, il_chunks=None, dimension=None, silent=False, use_text=False)
Convert siesnc format (NetCDF4) to SEGY.
Parameters:
Name | Type | Description | Default |
---|---|---|---|
seisnc
|
(Dataset, string)
|
The input SEISNC file either a path or the in memory xarray.Dataset |
required |
segyfile
|
string
|
The output SEG-Y file |
required |
trace_header_map
|
dict
|
Defaults to None. A dictionary of seisnc variables and byte locations. The variable will be written to the trace headers in the assigned byte location. By default CMP=23, cdp_x=181, cdp_y=185, iline=189, xline=193. |
None
|
il_chunks
|
int
|
The size of data to work on - if you have memory limitations. Defaults to 10. This is primarily used for large 3D and ignored for 2D data. |
None
|
dimension
|
str
|
Data dimension to output, defaults to 'twt' or 'depth' whichever is present |
None
|
silent
|
bool
|
Turn off progress reporting. Defaults to False. |
False
|
use_text
|
bool
|
Use the seisnc text for the EBCIDC output. This text usally comes from the loaded SEG-Y file and may not match the segysak SEG-Y output. Defaults to False and writes the default segysak EBCIDC |
False
|
Source code in segysak/segy/_segy_writer.py
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segy_freewriter(seisnc, segyfile, data_array='data', trace_header_map=None, use_text=False, dead_trace_key=None, vert_dimension='twt', chunk_spec=None, silent=False, **dim_kwargs)
Convert siesnc format (NetCDF4) to SEG-Y.
Parameters:
Name | Type | Description | Default |
---|---|---|---|
seisnc
|
(Dataset, string)
|
The input SEISNC file either a path or the in memory xarray.Dataset |
required |
segyfile
|
string
|
The output SEG-Y file |
required |
data_array
|
string
|
The Dataset variable name for the output volume. |
'data'
|
trace_header_map
|
dict
|
Defaults to None. A dictionary of seisnc variables and byte locations. The variable will be written to the trace headers in the assigned byte location. By default CMP=23, cdp_x=181, cdp_y=185, iline=189, xline=193. |
None
|
use_text
|
book
|
Use the seisnc text for the EBCIDC output. This text usally comes from the loaded SEG-Y file and may not match the segysak SEG-Y output. Defaults to False and writes the default segysak EBCIDC |
False
|
dead_trace_key
|
str
|
The key for the Dataset variable to use for trace output filter. |
None
|
vert_dimension
|
str
|
Data dimension to output, defaults to 'twt' or 'depth' whichever is present. |
'twt'
|
chunk_spec
|
dict
|
Xarray open_dataset chunking spec. |
None
|
silent
|
bool
|
Turn off progress reporting. Defaults to False. |
False
|
dim_kwargs
|
int
|
The dimension/byte location pairs to output dimensions to. The number of dim_kwargs should be equal to the number of dimensions on the output data_array. The sort order will be as per the order passed to the function. |
{}
|
Source code in segysak/segy/_segy_freewriter.py
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output_byte_locs(name)
Return common bytes position variable_dict for segy_writer.
Parameters:
Name | Type | Description | Default |
---|---|---|---|
name
|
str
|
One of [standard_3d, petrel_3d] |
required |
Returns:
Name | Type | Description |
---|---|---|
dict |
A dictionary of SEG-Y byte positions and default seisnc variable pairs. |
Example
segywriter(ncfile, 'segyfile.sgy', trace_header_map=output_byte_loc('petrel'))
Source code in segysak/segy/_segy_writer.py
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