GXLL2 class

class GXLL2(handle=0)[source]

GXLL2 class.

local datum lookup creator ll2 methods are used to create GXLL2 objects. GXLL2 objects contain latitude, longitude correction lookup tables to convert between datums.

__init__(handle=0)[source]
classmethod create(lon0, lat0, lon, lat, nlon, nlat, in_ipj, out_ipj)[source]

Create an empty GXLL2 table to be filled

Parameters:

  • lon0 (float) – Longitude origin

  • lat0 (float) – Latitude origin

  • lon (float) – Longitude increment

  • lat (float) – Latitude increment

  • nlon (int) – # longitudes

  • nlat (int) – # latitudes

  • in_ipj (GXIPJ) – Input projection

  • out_ipj (GXIPJ) – Output projection

Returns:

GXLL2 Object

Return type:

GXLL2

New in version 5.0.

License: Geosoft End-User License

See also

destroy, set_row, save

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 null()[source]

A null (undefined) instance of GXLL2

Returns:

A null GXLL2

Return type:

GXLL2

save(name)[source]

Save an GXLL2 to a named resource

Parameters:

name (str) – Named resource

New in version 5.0.

License: Geosoft End-User License

Note: The named resource is the name of the datum transform define inside square brackets in the datum transform name in the datumtrf table.

set_row(row, lon_vv, lat_vv)[source]

Define a row of the GXLL2

Parameters:

  • row (int) – The row to set

  • lon_vv (GXVV) – Longitude corrections

  • lat_vv (GXVV) – Latitude corrections

New in version 5.0.

License: Geosoft End-User License

Note: The correction data is in degrees, added to the input datum to product output datum results.

The GXVV lengths must be equal to #longitudes defined by create.