Describes the steps involved in the preparation of a map.

To prepare a map you import and merge maps and map data into a single view. You can decide what to make visible, when and how, style the data into a theme, transform the map according to the required projection, and apply unit and measure preferences. You can also export the map, if required.

You create new maps by exploiting the data contained in your existing electronic maps. Also, you can update your new map by importing additional map data at anytime during map preparation or at run time and without interrupting the system.

Map data model properties

JViews Maps integrates the various map data sources using a set of properties that define the way your map will display and react to run-time changes.

Properties

By default, JViews Maps embeds the following properties into a working map:

Extending and changing properties

The map properties can be extended or changed at any time during map preparation or final application execution. For example, you can implement applications to allow for a change of map projection or data source at run time.

About readers

Readers are provided that read map data in its native format, that is, without any need for preprocessing.

Formats supported

Readers can read a wide range of file formats containing the map and map data such as geometry and topology. Supported File Formats shows the supported file formats:

Additionally, you can use the open APIs to import other map formats.

JViews Maps can merge vector, raster, and elevation data from multiple map file formats and storage locations. You can prepare a map using georeferenced data (that is, systems defining projection, ellipsoid, and/or datum information), and nongeoreferenced map assets. For example, you can create a map with a UTM projection, import data from a CADRG map (with an Arc projection), a shape file based on a Lambert projection, and overlay these with a JPEG image. JViews Maps performs a reverse projection on the data sources into a common system such as Longitude/Latitude. The support offered is as follows:

Imported maps contain a vast amount of data that needs to be organized and presented in a way that is easily understood and suitable for its intended purpose. For example, you may want to create a map in which you can zoom smoothly from a small scale view to large scale view while displaying only information relevant to each particular zoom level. To do this, data sets need to be associated, displayed, changed, hidden, and so on. Additionally, you will want to use styling properties, such as color and transparency, to make the information easy to understand. JViews Maps uses layers and styling to achieve these goals.

Layers

JViews Maps defines a recursive hierarchy for map data. For example, you can define:

JViews Maps allows you to zoom from worldwide views down to a street level view using different data sets, but presenting a smooth transition to the user.

Importing data into layers

Data is imported to populate layers as follows:

Styling

Styling enables you to change colors, transparency, and so on to enable the data to be better understood. You can define styles for all objects in a particular layer or layer tree.

JViews Maps can transform coordinates delivered by one geodetic system to those based on another. For example, you can transform coordinates from a satellite-based system to those based on the national geodetic system of a particular country. Additionally you can set the ellipsoid and the datum you require.

Projections

JViews Maps supports the following projections:

 

The projection system is flexible and extensible. For example, you can develop your own specific projection algorithms and integrate them with the product.

Ellipsoid

Each projection system supports configurable ellipsoids:

You can define your own ellipsoids, entering the major axis and inverse flattening values.

Datum

JViews Maps comes with more than 200 predefined datum.

Transformation

For accuracy up to a meter, Rogue Wave®  JViews Maps provides the following DATUM transformation method:

Custom Transformation

You can develop your own DATUM algorithm. APIs allow access to the data model and return computational results for display.

JViews Maps allows you to overlay grid systems and set your preferred units and measures.

Grid systems

Predefined grids are provided for:

Adaptable grids

The grids are called adaptable grids because they adapt to the zoom level to ensure that there is always something meaningful on the screen.

There is no impact on memory and little on performance. JViews Maps  uses optimized parameters including, for example, delayed drawings. In this case, a simplified grid is displayed during zooming and panning, with only the 20 lines needed drawn on the view. When the view stops moving, it displays the more refined grid and labels.

Units

JViews Maps supports different units, including:

 

Extending Units

You can extend the supported units for linear and angular measurements.

Different measuring units can be used for distances and altitudes.

Working units can de changed dynamically, with conversion computed by a set of provided components.

Measuring

JViews Maps provides off-the-shelf components and end-user interactors for orthodromy measure of distance and bearing.

Distances can be measured in the supported units and changed dynamically.

Once prepared, a map can be exported as:

Open APIs are provided for exporting specific map formats.