Map Layers

Map layers are displayed and edited in the Map View of the project window, which can be selected by clicking the Map View button in the project menu bar:

 

 

 

Map Projects are made up of a set of Map Layers, each of which is made up of one or more geographic components.

Each map layer is of a specific type and can only hold components of that type.

Map layers each have a relative  drawing (Z) order in the map, which determines which layers are drawn on top of each other.

Components within a map layer have no defined Z-order. If a specific drawing order for certain components is required, they should be held in separate map layers.

Vector map layers allow styles to be set at the layer level and the component level. Styles set at the layer level provide a default style for all of the components within the layer, whilst styles set at the component level will override the layer level style for individual components.

Map layers can be generated from track-log data as a part of the map building process, created and edited by hand or imported from file.

Map layers can be copied between map projects or duplicated within the same map project, and components can be copied between map layers of the same type.

 

 

Map Layer Types

Map layers can be split into two broad categories; Vector layers and Raster layers. Vector layers contain a set of editable vector components, such as lines or polygons, whilst raster layers contain a single graphical component such as a satellite background image or shaded relief image.

 

Vector Map Layers

Vector map layers contain a set of vector components, each of which can by independently styled and edited. Each vector map layer holds components of a single type.

 

Vector map layers can be one of the following types:

 

PolyLine

Polylines are lines with no associated depth values. The width and colour of polylines can be styled at the layer or component level. Polylines are always drawn on top of raster, polygon and isobath layers.

Contour

Contours are lines with an associated depth value which can be rendered with labels. The width and colour of contours can be styled at the layer of component level, along with label visibility and font size. Contours are always drawn on top of raster, polygon and isobath layers.

Polygon

Polygons are areas with three or more points that can be filled with colour. The fill colour and border width and colour can be styled at the layer or component level.

Isobaths

Isobaths are polygons with associated upper and lower values, typically depth or hardness. The fill colour and border width and colour can be styled at the layer or component level and a palette can be applied to the layer to provide colours to the components based on their relative values.

 

 

Raster Map Layers

Raster map layers hold a single graphical component and can only be edited at the layer level.

 

Raster map layers can be one of the following types:

 

Background Image

A background image is an image file that has been imported into the workspace via the Import Image command.

Flat Raster

A flat raster is a colourised representation of the DEM grid generated as part of the map generating process.

Shaded Relief

Shaded relief is a pseudo 3D view of the map with shadowing applied to gradients. The palette, light direction and vertical exaggeration can all be edited.

 

 

Generated Map Layers

Generated map layers are map layers that have been generated as part of the map build process, and include layers such as major and minor contours, isobaths, shorelines and land area. The important distinction between generated and non-generated map layers is that the components within a generated map layer will be replaced when the Map Project is rebuilt. This means that any edits to individual components or component styles within a generated layer will be lost when the map project is rebuilt. Any changes made to a layer's style will be retained across builds.

 

Map layers can be "unlinked" from a map project by duplicating them, or copying to another map project. A map layer that has been duplicated or copied is no longer linked to an underlying map project, will not be updated when the map project is built and loses the generated styling within the layers list.

 

Generated layers are distinguished from non-generated layers in the Layers List by a shaded background and the generated icon shown to the right of the layer name:

 

(1) A generated land layer (2) A copy of the land layer, which is no longer linked to the map project

 

 

Generated Map Layer Types

The following table describes the layers that are generated as part of a typical Map Project build:

 

Layer Name

Layer Type

Description

Major Contours

Contour

The Major Contours layer is a contour layer containing contours at the depth interval specified in the project's major contour setting.

By default, major contour layers show labels for depth values.

Minor Contours

Contour

The Minor Contours layer is a contour layer containing contours at the depth interval derived from the project's major contour setting.

By default, minor contours are shown without depth labels.

Isobaths

Isobath

The Isobaths layer is an isobath layer containing depth areas, with the lower and upper depth for each area aligned to the depths of major contours.

Isobath layers can be styled at the layer level by selecting a palette, which colours individual areas according to their depths.

The isobath layer is only generated when the option Generate Isobaths is checked within the project toolbar.

Water Body

Polygon

The Water Body layer is a polygon layer that contains the intersection of any defined map boundaries and the defined map area. This layer is only generated when a shoreline map boundary has been defined in the map project.

Land

Polygon

The Land layer is a polygon area that provides the inverse of the Water Body layer. This layer is only generated when at least one map boundary has been defined in the map project.

Shorelines

PolyLine

The Shorelines layer is a polyline layer with components for the borders of all defined shorelines and islands.

Flat Raster

Flat Raster

A colourised representation of the DEM grid generated as part of the map generating process with a selectable palette.

Shaded Relief

Shaded Relief

Shaded relief is a pseudo 3D view of the map with shadowing applied to gradients. The palette, light direction and vertical exaggeration can all be edited.

Hardness<type>

Isobath

Isobath layers containing hardness areas generated using the optional Bottom Composition module. Each hardness type generates a separate layer, with the hardness type included as part of the layer name.

 

 

 

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