Importing LAS Files

Depending on whether you have an existing drillhole group or not, you may need to create a new group by right clicking in the object tree of ANALYST.

Creating a new drillhole group.

Once there’s a group to import the data into, the import dialog will guide the user through the process.

Import dialog.

For every import operation the user will need to select an existing drillhole group to import to and LAS files to import from.

Choosing drillhole group and files for import.

In order to organize the data by property, the user provides a name to the geoh5py.property_group and a collocation tolerance that is used by geoh5py to determine if incoming data should be included in existing property groups with the same name. A new property group is created if the incoming depth sampling is outside of the collocation tolerance.

Choosing a name for the property group being imported and setting a tolerance for assigning to existing groups.

The next section gives the user the option to provide collar location field names expected to be found in the header of the LAS files being imported. This is a necessary step since the LAS format does not include a standard for this information. It may be necessary to scan the files to find field names that apply to all (or most) of the files. Just open the files in an editor and look in the Well section of the header for something that looks like easting/northing/elevation data.

Scanning LAS file headers for collar location data.

The user may also choose to skip_empty_header to ignore files that do not contain collar location information as this may lead to many drillholes without location data being piled up at the origin.

Collar location options including a checkbox to skip files without location data.

Finally, the user may choose to include/exclude warnings which may be helpful for initial imports, but a nuisance in subsequent import operations.

Setting warnings preference.