Block Numbering

In creating a TerraScan project there are several approaches that one can take when numbering the blocks.

Option 1:

Use a pre-defined tile layout where blocks already have names/numbers assigned to them. The layout can be a DGN, DXF or shapefile and you use MicroStation’s functionality to reference and import into the working design file. If you don’t have a DGN with the tile layout, then a DXF typically works best. Once the layout is in MicroStation then select the blocks and the labels and use the Selected Strings or Selected Numbers options that are available with the Add blocks by boundaries command.

Option 2:

Using the file prefix/numbering/first number options that are available with the Add blocks by boundaries command.

Block boundaries can be created two ways.

The first way is  using Design Block Boundaries. The second option is to auto generate the tile index upon import of the data into the project.

Once the boundaries are created add the boundaries to the TerraScan project and allow TerraScan to name/number the tiles based upon one of the options listed below:

Add Blocks by Boundaries Numbering Options

Add Blocks by Boundaries Numbering Options

Setting: Effect:
File prefix Prefix for the names of project blocks and related block binary files.
Numbering Method of assigning names or name parts to blocks:

• Selection order – automatic numbering increases in the same order as boundary shapes have been selected.
• North to south – automatic numbering increases geographically from north to south and secondarily west to east.
• South to north – automatic numbering increases geographically from south to north and secondarily west to east.
• West to East – automatic numbering increases geographically from west to east and secondarily south to north.
• East to West – automatic numbering increases geographically from east to west and secondarily south to north.
• Trajectory order – automatic numbering increases according to the order of data capturing. The time of data capturing is derived from the active trajectories in TerraScan.
• Selected numbers – the name is defined by a unique numerical text element that is placed inside each block boundary.
• Selected strings – the name is defined by a text element that is placed inside each block boundary.
The list may further include Block naming formulas that are defined in TerraScan Settings.

Option 3

Specify the block naming convention when creating a TerraScan Project.

To create a project definition:

  1. Select New project command from the File pulldown menu. This opens the Project information dialog.
  2. Define settings and click OK.
Setting: Effect:
Scanner Scanner type: Airborne, Mobile or Ground based.
Description Descriptive text for the project.
First point id Start ID number for the laser data file.
Storage Block binary file format: Fast binary, Scan binary 8 bit, Scan binary 16 bit, EarthData EEBN, EarthData EBN, LAS 1.x, or LAZ 1.x. For more information see Choosing a project storage format.
Attributes Opens the Attributes to store dialog. Only active attributes are stored in project block laser point files that belong to the project.
Require file locking If on, a project block file is marked as locked when a user opens it for modification with the Open block command. For more information see File lockinge.
Data in Defines how the directory for the referenced laser data files is determined:

• Project file directory – laser files are stored in the same directory as the project file. This is independent of the absolute path of the data and is therefore good in a network environment or when moving the data set from one computer to another.

• Separate directory – laser files are stored at the location given in the Directory field.

Load classes automatically If on, the defined Class file is automatically loaded with the project.
Load line colors automatically If on, the defined Color file for line colors is automatically loaded with the project.
Load trajectories automatically If on, trajectories from the given Directory are loaded automatically with the project.
Reference project exists If on, the given Project file is defined as reference project to be used in corresponding tools, such as Compare with reference command.
Default Size of rectangular, automatically created blocks. These blocks are created if points are imported from areas which are outside the predefined block boundaries.
Block prefix Prefix of block names that is used for automatically created block boundaries.
Block naming Block name definition for automatically created block boundaries. The list contains Number as automatic numbering option, and any user defined Block naming formulas defined in TerraScan Settings.
TerraScan Project Set-up Block Naming

TerraScan Project Set-up Block Naming

Option 4

Block naming formulas allows a user to add a naming convention to the Numbering list in Option 2 and 3. A user can Add, Edit, and Delete block naming formulas by using the corresponding buttons in the Settings dialog.

TerraScan Settings Block Naming Formulas

TerraScan Settings Block Naming Formulas

To create a new block naming formula:

  1. Open the Block naming formula category.
  2. Click Add in the Settings dialog. The Block naming formula dialog opens:
Block Naming Formula Settings

Block Naming Formula Settings

  1. Define settings and click OK.
  2. Close the Settings dialog in order to save the modified settings for TerraScan.
Setting: Effect:
Description Description of the formula.
Format Format of the formula.
Append Opens the Append field dialog. The dialog contains a list of variables which can be added to a formula:

• minimum | maximum easting | northing – minimum or maximum values of easting or northing corner coordinates of a block boundary.

• block size – block height or width value, whatever is larger.

• block number – number according to the selection order of block boundaries.

Block naming formulas are stored in a configuration file BLOCKNAMING.INF in the TerraScan installation folder. You can copy this file to other computers in order to make block naming formulas available on them.

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