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Introduction

The interface to the UNCLOS specific features in Geocap are through the use of schemas on datasets and commands. The commands can be found in the Toolbox to the right in the Geocap interface or at the top of the menu which appear when you right click a dataset. Which commands are displayed in the right click menu depend on the schema of the dataset. A Base Line will contain commands appropriate for the Base Line schema, while a Bathymetric Profile will contain different commands.

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Actors

In display context an actor is a graphical term for a visualization unit. A complex display is created by a set of actors. In Geocap the basic principle is that a display command creates one or several actors.

Visualizations are called actors

Schemas

Geocap uses schemas to classify a dataset. By default datasets are organized into data types, such as points and lines (polydata), grids (structured points) etc. These are basic geometric types that contain little information about the domain in which they operate. E.g. coast lines, bathymetric profiles and boundary polygons are all lines (polydata), but the way we work with these types of data are very different and so it is only natural to classify them into different categories. This higher level of classification is made possible by schemas. 

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Notice that the dataset types are the same, while the schemas are different

The Shelf Module contains several schemas. Some of the schemas used in the Shelf Module are coast line, base line, limit line, seabed, sediment thickness. You can define the schema of a dataset in the project by right clicking it, and selecting set schema in the pop-up menu. The choice of a dataset´s schema controls which commands you see in the pop-up menu when you right click the dataset. You may create your own schemas as well as edit existing schemas by selecting schemas under edit in the main menu. You can also edit the commands associated with the schemas.

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You will find the commands sorted into the different categories in the Toolbox (see illustration below) or on the right-click menu of a dataset or a folder. Commands are can also be put together in sequence in Workflows to perform visualizations or data operations, see chapter S.

All commands have a front end panel, and most of them have settings that may be customized.
 
 An example of a command front end panel

Item commands
A command can be stored at the level of a dataset or a folder. This is called an item command. This command is unique to this dataset or folder, it "belongs" to that dataset. You can see these commands on the top of the Toolbox or in a sub menu when you right-click a dataset and select Item commands. Most items in the project do not contain any item commands by default. Schema Commands
A command stored at a schema level is called a schema command. All

An item command is associated with a single dataset or folder in the project. Item commands are stored along with the project. Therefore, if a project is transferred the item commands will transferred as well. Item commands typically contain settings that pertain specifically to the dataset to which it belongs.

Schema Commands
A schema command is stored with a schema. All datasets or folders using the same schema share these commands, which also means that editing these commands will affect all the datasets using this schema. The schema commands of a dataset are listed on the top of the right- The shared commands are listed on the right click menu and in the Toolbox under Schema commands. 

Shared Commands
Shared Commands are commands which are shared with all datasets and folders. The shared commands are listed in the Toolbox under Shared commands. If you cannot see the Toolbox, it can be opened from View on the main menu.All commands have a command editor where you may change the properties, thus affecting the way it is executed. 

Default Commands
The default command is the command that is executed when you tick the box next to a dataset in the project. By default a dataset will have one of the schema commands as a default command. This can however be changed.

Color Tables

Geocap comes with a set of predefined color tables which can be seen in the toolbox. These color tables are of course customizable, or you can create your own color table from scratch. By default the color tables shown in the lower right corner of Geocap will be used to display a dataset. You can change these color tables by selecting one of them, right-click another color table in the toolbox and select Activate. You can also use drag and drop to drag a color table from the toolbox and drop it onto a displayed dataset in the graphical window.

Sticky Surface

Geocap has a concept where any surface can be set to be sticky. When a surface is sticky, data like points, lines or images may be displayed onto that surface. This is mainly done by re-sampling lines and displaying them a little bit above the sticky surface. When a surface is activated (or set) as a sticky surface, it is copied to workspace under the name sticky_surface. If this dataset is removed from workspace, there is no sticky surface anymore.

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Keyboard shortcuts

Geocap has several keyboard shortcuts or hotkeys. Go Help > Keyboard shortcuts to bring up a list. A selection of the most important keyboard shortcuts:

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