Gridding based on a Reference Model

Imported data can be gridded along planes defined by reference model surfaces. To import a surface using a reference model:

1. Select one or more reference model surfaces (including vertical surfaces) and/or templates.

If a reference model template is selected, all the reference model surfaces, including vertical surfaces, in the template are considered. If no selection is made, all of the reference model templates are considered. If no selection is made and no reference model templates exist, all the reference model surfaces in the model are considered.

The Import Wizard is used in the creation of raster surfaces through this command.

2. Select the Import Wizard command.

The Import Wizard is displayed. The first step lists the data formats that can be imported.

3. Select the format of the data you are importing.

4. Click Next.

Import Wizard (Step 2)

The Import Wizard (Step 2) is used to select the file(s) to be imported into BASE Editor. You can import a single file or multiple files at once. The result will be a single CSAR file, regardless of the number of files imported. If importing multiple files, they must all have the same coordinate system and be in the selected format.

1. Click Select to locate a file to import.

The standard Windows Open dialog box is displayed.

2. Select one or more files and click OK.

3. Click Next.

Import Wizard (Step 3)

The Import Wizard (Step 3) is used to define settings for the data being imported.

1. Click the browse button (...) and select the coordinate reference system of the data being imported.

2. Change the Z-axis convention if necessary; the default is Down is positive.

3. Select Distance from Plane as the Primary Z attribute band.

4. Click Next.

Import Wizard (Step 4)

The Import Wizard (Step 4) is used to define a gridding method and settings for the data being imported. The gridding operation considers points within a defined tolerance of each reference model surface, to preclude 'distant' features being considered.

1. Choose the Vertical output coordinate system.

2. Select either Point Cloud or Grid for the Output data type.

3. Select a Gridding method from the drop-down list.

4. Click Next.

Import Wizard (Step 5)

The Import Wizard (Step 5) is used to define the extents of the surface.

1. Select or enter the desired spatial parameters for the import.

2. Click Next.

Import Wizard (Step 6)

The Import Wizard (Step 6) lists the attributes available for the dataset based on the file being imported. For vertical or inclined data, Farthest above and Farthest below may be selected from the computed statistics.

1. Select the desired Format-specific attributes and Computed attributes.

2. Click Finish.

The names for each reference model surface are used in the name of the resulting raster surface. All of the raster surfaces are produced in a single CSAR file, selected by the user in the Import Wizard.

Gridding based on a reference model produces multiple raster surfaces in a single CSAR file. When the CSAR is opened, all of the raster surfaces are automatically displayed as being part of a group. It is possible to perform regular grouping operations, such as ungrouping the raster surfaces. Note that even once the raster surfaces are ungrouped, they are still stored in a single CSAR file. It is possible to use Save As in the right-click menu of the Layers window to extract a single raster surface into a separate CSAR file. See Save As for more information.

The Z values displayed when selecting and/or exporting these raster surfaces are based on the traditional top-down datum, as are the X and Y values (Northings/Eastings or Latitude/Longitude). Internally, there is a distinct coordinate reference system for the raster surface, establishing a rotated grid, but those internal coordinates are an internal detail. The rotated grid can be seen through the planar normal and offset properties, as well as the structure of the grid, and the spatial bands contain values that are distances from the plane.