GXSEGYREADER class¶

class GXSEGYREADER(handle=0)[source]¶

GXSEGYREADER class.

Convert 3D SEG Y files to voxel or database.

__init__(handle=0)[source]¶

add_trace_filter(offset, value1, value2, constraint)[source]¶

Add a filter based on trace header fields.

Parameters:

offset (int) – byte-offset of the field to filter by.
value1 (int) – If constraint is EQUAL and NOT_EQUAL, this is the value to compare the field to. For IN_RANGE and NOT_IN_RANGE, this is the minimum.
value2 (int) – If constraint is EQUAL and NOT_EQUAL, this parameter is ignored For IN_RANGE and NOT_IN_RANGE, this is the maximum.
constraint (str) – How the values are compared. Can be “IN_RANGE”, “NOT_IN_RANGE”, “EQUAL” or “NOT_EQUAL”.

New in version 9.7.

License: Geosoft End-User License

check_sane_inline_crossline(is_sane, possibly_swapped, only_one_line)[source]¶

Checks if the currently-configured inline and crossline fields seem sensible.

Parameters:

is_sane (bool_ref) – True is inline/crossline values seem sensible.
possibly_swapped (bool_ref) – True if it looks like the inline and crossline fields are swapped.
only_one_line (bool_ref) – True if it looks like the file only contains one line. This may mean the file is 2D.

New in version 9.6.

License: Geosoft End-User License

clear_trace_dummy_value()[source]¶

Disables the trace dummy value.

New in version 9.7.

License: Geosoft End-User License

clear_trace_filters()[source]¶

Remove all active trace filters.

New in version 9.7.

License: Geosoft End-User License

clear_user_range()[source]¶

Clears inline and crossline ranges to clamp to.

New in version 9.7.

License: Geosoft End-User License

clear_user_z_range()[source]¶

Clears Z-range to clamp to, disbling z-clamping.

New in version 9.7.

License: Geosoft End-User License

count_traces_that_pass_filters()[source]¶

Count the number of traces that pass the currently-configured trace filters.

Return type:: int

New in version 9.7.

License: Geosoft End-User License

estimate_number_of_traces(data_type_name, number_of_samples)[source]¶

Get the number of traces that would be in the SEG-Y file, given a trace length and data type.

Parameters:

data_type_name (str) – The name of a supported data type.
number_of_samples (int) – The number of samples to return

Return type:

int

New in version 9.6.

License: Geosoft End-User License

export_files()[source]¶

Exports contents of SEG Y file to voxel and/or database.

New in version 9.7.

License: Geosoft End-User License

export_voxel_and_database(voxel_filename, gdb_filename)[source]¶

Exports contents of SEG Y file to voxel and/or database.

Parameters:

voxel_filename (str) – Output voxel file name
gdb_filename (str) – Output database file name

New in version 9.6.

License: Geosoft End-User License

get_binary_header()[source]¶

Get the SEG Y file’s binary header.

Returns:

class:’LTB’ containing three columns:: the field name, offset, and value. The value column will be in text form, suitable for display to the end user.

Return type:

GXLTB

New in version 9.6.

License: Geosoft End-User License

get_clip_xy_extents(is_clip_valid, x_min, x_max, y_min, y_max)[source]¶

Gets the X,Y extents to clip the voxel.

Parameters:

is_clip_valid (int_ref) – is clip area valid
x_min (float_ref) – minimum X value
x_max (float_ref) – maximum X value
y_min (float_ref) – minimum Y value
y_max (float_ref) – maximum Y value

New in version 9.7.

License: Geosoft End-User License

get_endianess()[source]¶

Returns true if the file is little endian. false if it is big endian.

Return type:: bool

New in version 9.6.

License: Geosoft End-User License

get_field_configuration()[source]¶

Returns information on the data in the trace headers.

Returns:: :class:’LTB’ containing trace header information
Return type:: GXLTB

New in version 9.6.

License: Geosoft End-User License

get_georeferencing()[source]¶

Returns the georeferencing of the voxel that would be exported with the current configuration.

Return type:: GXIPJ

New in version 9.6.

License: Geosoft End-User License

get_inline_and_crossline_azimuths(inline_azimuth, crossline_azimuth)[source]¶

Get the inline and crossline azimuths, in degrees

Parameters:

inline_azimuth (float_ref) – Inline azimuth
crossline_azimuth (float_ref) – Crossline azimuth

New in version 9.6.

License: Geosoft End-User License

get_is_3d()[source]¶

Returns true if the file is 3D false if it is 2D.

Return type:: bool

New in version 9.7.

License: Geosoft End-User License

get_last_sample_at(value)[source]¶

Returns the depth of the last sample in the traces, in the units specified by SetZUnits()

Parameters:: value (float_ref) – Out-parameter containing the depth of the last sample in the traces.

New in version 9.6.

License: Geosoft End-User License

classmethod get_num_trace_data_types()[source]¶

Returns the number of supported trace data types.

Return type:: int

New in version 9.6.

License: Geosoft End-User License

get_possible_z_units(z_units_list)[source]¶

Get a list of the possible values that can be passed to SetZUnits(). The values returned by this function depend on what the z-type is set to.

Parameters:: z_units_list (str_ref) – List of possible z-units,separated by newlines

New in version 9.6.

License: Geosoft End-User License

get_sample_interval(sample_interval)[source]¶

Returns the sample interval of the trace data.

Parameters:: sample_interval (float_ref) – output parameter for sample interval

New in version 9.6.

License: Geosoft End-User License

get_sample_interval_configuration(which_header, location)[source]¶

Specifies where the sample interval comes from: can be a field in the binary file header, a field in the trace header, or a value specified by the user.

Parameters:

which_header (str_ref) – Out-parameter indicating which header contains the trace length: “file_header” “trace_header”, or “none”
location (int_ref) – Out-parameter containing the byte offset of the field within the header (if applicable)

New in version 9.6.

License: Geosoft End-User License

get_slice_filenames(filename_list)[source]¶

Returns a list of the filenames of the XY slices that will be exported.

Parameters:: filename_list (str_ref) – List of filenames,separated by newlines

New in version 9.7.

License: Geosoft End-User License

get_text_header(text)[source]¶

Get the SEG Y file’s text header.

Parameters:: text (str_ref) – The text header contents.

New in version 9.6.

License: Geosoft End-User License

get_tie_point(i, x, y, in_line, cross_line)[source]¶

Return the currently-active tie points. If SetTiePoints() has not already been called, then the returned points will be the automatically-selected ones.

Parameters:

i (int) – Tie point indexl must be 0, 1 or 2.
x (float_ref) – x-coordinate
y (float_ref) – inline-coordinate
in_line (int_ref) – Tie point index.
cross_line (int_ref) – crossline-coordinate

New in version 9.6.

License: Geosoft End-User License

get_trace_count(count)[source]¶

Get the number of traces in the SEG Y file

Parameters:: count (int_ref) – Trace count

New in version 9.6.

License: Geosoft End-User License

get_trace_data(trace_number)[source]¶

Get the SEG Y trace file header data for a particular starting trace

Parameters:: trace_number (int) – Which trace to read
Returns:: :class:’VV’ containing the data from the trace header
Return type:: GXVV

New in version 9.10.

License: Geosoft End-User License

get_trace_data_at(data_type_name, number_of_samples, current_trace, is_big_endian)[source]¶

Get the SEG Y trace file data for a particular data type, number of samples, and starting trace

Parameters:

data_type_name (str) – The name of a supported data type.
number_of_samples (int) – The number of samples to return
current_trace (int) – The trace to start at
is_big_endian (int) – 1 for big endian, 0 for small

Returns:

:class:’VV’ containing the data from the traces

Return type:

GXVV

New in version 9.6.

License: Geosoft End-User License

get_trace_data_type(name)[source]¶

Get the data type of the trace data. This will match one of the names rfeturned by GetTraceDataTypeName()

Parameters:: name (str_ref) – The name of data type.

New in version 9.6.

License: Geosoft End-User License

classmethod get_trace_data_type_display_name(index, name)[source]¶

Get a string, suitable for displaying to the user, describing the type returned by passing the same index value to GetTraceDataTypeName()

Parameters:

index (int) – Which name to return.
name (str_ref) – The display name of a supported data type.

New in version 9.6.

License: Geosoft End-User License

classmethod get_trace_data_type_name(index, name)[source]¶

Get the name of one of the available data types. These are the names used as identifiers in this API. To get a name suitable for displaying to the user, use `GetTraceDataTypeDisplayName() instead.

Parameters:

index (int) – Which name to return. Call this function for each value between 0 and the value returned by GetNumTraceTypes() to get a full list of the available types.
name (str_ref) – The name of a supported data type.

New in version 9.6.

License: Geosoft End-User License

get_trace_header_as_json(trace_number, text)[source]¶

Return the contents of a trace header as JSON.

Parameters:

trace_number (int) – Which trace to read
text (str_ref) – Trace header as JSON.

New in version 9.10.

License: Geosoft End-User License

get_trace_header_at(data_type_name, number_of_samples, current_trace, is_big_endian)[source]¶

Get the SEG Y trace file header data for a particular starting trace

Parameters:

data_type_name (str) – The name of a supported data type.
number_of_samples (int) – The number of samples to return
current_trace (int) – The trace to start at
is_big_endian (int) – 1 for big endian, 0 for small

Returns:

:class:’VV’ containing the data from the trace header

Return type:

GXVV

New in version 9.6.

License: Geosoft End-User License

get_trace_length()[source]¶

Returns the number of data samples per trace.

Return type:: int

New in version 9.6.

License: Geosoft End-User License

get_trace_length_configuration(which_header, location)[source]¶

Specifies where the trace length comes from: can be a field in the binary file header, a field in the trace header, or a value specified by the user.

Parameters:

which_header (str_ref) – Out-parameter indicating which header contains the trace length: “file_header” “trace_header”, or “none”
location (int_ref) – Out-parameter containing the byte offset of the field within the header (if applicable)

New in version 9.6.

License: Geosoft End-User License

get_voxel_cell_size(x, y, z)[source]¶

Get the cell size of the voxel that would be exported with the current configuration.

Parameters:

x (float_ref) – Voxel cell size along X
y (float_ref) – Voxel cell size along Y
z (float_ref) – Voxel cell size along Z

New in version 9.6.

License: Geosoft End-User License

get_voxel_dimensions(x, y, z)[source]¶

Get the size of the voxel that would be exported with the current configuration.

Parameters:

x (int_ref) – Voxel size along X
y (int_ref) – Voxel size along Y
z (int_ref) – Voxel size along Z

New in version 9.6.

License: Geosoft End-User License

get_xy_units(xy_units)[source]¶

Get the currently-specified xy-units.

Parameters:: xy_units (str_ref) – The name of the units.

New in version 9.6.

License: Geosoft End-User License

get_z_offset(z_offset)[source]¶

Returns the z-offset (time delay) of the trace data. Positive values correspond to a deeper top-of-trace; negative values to a higher top-of-trace.

Parameters:: z_offset (float_ref) – The z offset/time delay

New in version 9.6.

License: Geosoft End-User License

get_z_offset_configuration(which_header, location)[source]¶

Specifies where the z-offset (time delay) comes from: can be a field in the binary file header, a field in the trace header, or a value specified by the user.

Parameters:

which_header (str_ref) – Out-parameter indicating which header contains the z offset: “file_header” “trace_header”, or “none”
location (int_ref) – Out-parameter containing the byte offset of the field within the header (if applicable)

New in version 9.6.

License: Geosoft End-User License

get_z_offset_units(z_units)[source]¶

Get the currently-specified units for the z offset.

Parameters:: z_units (str_ref) – List of possible z-units,separated by newlines

New in version 9.6.

License: Geosoft End-User License

get_z_type(z_type)[source]¶

Indicate if the z-dimension is time or depth.

Parameters:: z_type (str_ref) – Either “DEPTH” or “TIME”.

New in version 9.6.

License: Geosoft End-User License

get_z_units(z_units)[source]¶

Get the currently-specified z-units.

Parameters:: z_units (str_ref) – The name of the z-units.

New in version 9.6.

License: Geosoft End-User License

is_null()[source]¶

Check if this is a null (undefined) instance

Returns:: True if this is a null (undefined) instance, False otherwise.
Return type:: bool

classmethod list_binary_header_fields()[source]¶

Returns the names and offsets of the fields in the binary header.

Return type:: GXLTB

New in version 9.6.

License: Geosoft End-User License

classmethod list_trace_header_fields()[source]¶

Returns the names and offsets of the fields in the trace header.

Return type:: GXLTB

New in version 9.6.

License: Geosoft End-User License

classmethod null()[source]¶

A null (undefined) instance of GXSEGYREADER

Returns:: A null GXSEGYREADER
Return type:: GXSEGYREADER

classmethod open_file(filename)[source]¶

Opens a 3D SEG Y file.

Parameters:: filename (str) – File name
Returns:: GXSEGYREADER handle, terminates if creation fails.
Return type:: GXSEGYREADER

New in version 9.6.

License: Geosoft End-User License

override_navigation_2d(shotpoint_coords, x_coordinates, y_coordinates)[source]¶

Specify the X/Y coordinates of the traces, instead of using values from the trace headers.

Parameters:

shotpoint_coords (GXVV) – The shotpoint coordinates, asread from the trace headers.
x_coordinates (GXVV) – The x-coordinates
y_coordinates (GXVV) – The y-coordinates

New in version 9.7.

License: Geosoft End-User License

recalculate_georeferencing()[source]¶

Recalculate georeferencing; call after configuration has changed.

New in version 9.6.

License: Geosoft End-User License

reset_tie_points()[source]¶

Discard user-supplied tie points and auto-choose new ones..

New in version 9.6.

License: Geosoft End-User License

scan_file()[source]¶

Scans the SEG Y file, and attempts to guess the layout.

New in version 9.6.

License: Geosoft End-User License

set_auto_voxel_cell_size_xy()[source]¶

Set the XY cell size of the voxel that would be exported to the dimensions calculated from the tie points..

New in version 9.6.

License: Geosoft End-User License

set_crossline_slice_indices(indices)[source]¶

Which crossline slices to export to a section grid.

Parameters:: indices (GXVV) – Which crossline values to export.

New in version 9.7.

License: Geosoft End-User License

set_endianess(is_little_endian)[source]¶

Set the endianess of the file.

Parameters:: is_little_endian (bool) – True is file is little endian, false for big endian.

New in version 9.6.

License: Geosoft End-User License

set_field_configuration(configuration)[source]¶

Sets the interpretation of the fields in the SEG Y file, and specifies which fields should be exported to GDB.

Parameters:: configuration (GXLTB) – GXLTB following the same format as returned by GetFieldConfiguration().

New in version 9.6.

License: Geosoft End-User License

set_gdb_output_filename(filename)[source]¶

Exports contents of SEG Y file to a database.

Parameters:: filename (str) – Output database file name

New in version 9.7.

License: Geosoft End-User License

set_georeferencing(ipj)[source]¶

Sets the georeferencing of the voxel that would be exported with the current configuration.

New in version 9.6.

License: Geosoft End-User License

set_inline_slice_indices(indices)[source]¶

Which inline slices to export to a section grid.

Parameters:: indices (GXVV) – Which inline values to export.

New in version 9.7.

License: Geosoft End-User License

set_is_3d(is_3d)[source]¶

Specify if the input SEG-Y file is 3D or 2D.

Parameters:: is_3d (bool) – True is file is 3D, false for 2D.

New in version 9.7.

License: Geosoft End-User License

set_sample_interval_configuration(which_header, location, location_or_value)[source]¶

Specifies where the sample interval comes from: can be a field in the binary file header, a field in the trace header, or a value specified by the user.

Parameters:

which_header (str) – Which header contains the sample interval: “file_header”, “trace_header” or “none”
location (int) – If which_header is “file_header” or “trace_header”, then this parameter is the offset of the field containing the sample interval. If which_header is “none”, thenthis parameter is ignored.
location_or_value (float) – If which_header is “file_header” or “trace_header”, then this parameter is ignored. If which_header is “none”, thenthis parameter is the sample interval.

New in version 9.6.

License: Geosoft End-User License

set_section_output_filename(filename)[source]¶

Exports contents of SEG Y file to a crooked section.

Parameters:: filename (str) – Output crooked section file name

New in version 9.7.

License: Geosoft End-User License

set_slice_output_prefix(prefix)[source]¶

Exports inline or crossline slices to a section grid.

Parameters:: prefix (str) – Output section file name prefix

New in version 9.7.

License: Geosoft End-User License

set_tie_point(i, x, y, in_line, cross_line)[source]¶

Set the currently-active tie points. If SetTiePoints() has not already been called, then the returned points will be the automatically-selected ones.

Parameters:

i (int) – Tie point index.
x (float) – x-coordinate
y (float) – inline-coordinate
in_line (int) – Tie point index.
cross_line (int) – crossline-coordinate

New in version 9.6.

License: Geosoft End-User License

set_trace_data_type(name)[source]¶

Set the data type of the trace data. This must match one of the names returned by GetTraceDataTypeName()

Parameters:: name (str) – The name of data type.

New in version 9.6.

License: Geosoft End-User License

set_trace_dummy_value(dummy_value)[source]¶

Sets the trace dummy value.

Parameters:: dummy_value (float) – trace dummy value

New in version 9.7.

License: Geosoft End-User License

set_trace_length_configuration(which_header, location_or_value)[source]¶

Specifies where the trace length comes from: can be a field in the binary file header, a field in the trace header, or a value specified by the user.

Parameters:

which_header (str) – Which header contains the trace length: “file_header”, “trace_header” or “none”
location_or_value (int) – If which_header is “file_header” or “trace_header”, then this parameter is the offset of the field containing the trace length. If which_header is “none”, then this parameter is the actual trace length.

New in version 9.6.

License: Geosoft End-User License

set_user_crossline_range(crossline_min, crossline_max, crossline_stride, factor)[source]¶

Sets crossline-range to clamp to.

Parameters:

crossline_min (int) – crossline minimum
crossline_max (int) – crossline maximum
crossline_stride (int) – crossline stride
factor (int) – Decimation factor

New in version 9.7.

License: Geosoft End-User License

set_user_inline_range(inline_min, inline_max, inline_stride, factor)[source]¶

Sets inline-range to clamp to.

Parameters:

inline_min (int) – inline minimum
inline_max (int) – inline maximum
inline_stride (int) – inline stride
factor (int) – Decimation factor

New in version 9.7.

License: Geosoft End-User License

set_user_voxel_cell_size_xy(x, y)[source]¶

Set the XY cell size of the voxel that would be exported with the current configuration.

Parameters:

x (float) – Voxel cell size along X
y (float) – Voxel cell size along Y

New in version 9.6.

License: Geosoft End-User License

set_user_z_range(z_min, z_max)[source]¶

Sets Z-range to clamp to.

Parameters:

z_min (float) – Z minimum
z_max (float) – Z maximum

New in version 9.7.

License: Geosoft End-User License

set_voxel_output_filename(filename)[source]¶

Exports contents of SEG Y file to voxel.

Parameters:: filename (str) – Output voxel file name

New in version 9.7.

License: Geosoft End-User License

set_z_decimation(factor)[source]¶

Sets Z decimation factor.

Parameters:: factor (int) – Decimation factor

New in version 9.7.

License: Geosoft End-User License

set_z_offset_configuration(which_header, location, value)[source]¶

Specifies where the z-offset (time delay) comes from: can be a field in the binary file header, a field in the trace header, or a value specified by the user.

Parameters:

which_header (str) – Which header contains the z offset: “file_header”, “trace_header” or “none”
location (int) – If which_header is “file_header” or “trace_header”, then this parameter is the offset of the field. If which_header is “none”, then this parameter is ignored.
value (float) – If which_header is “file_header” or “trace_header”, then this parameter is ignored. If which_header is “none”, then this parameter is the z offset.