Viewing airspace

You can turn on airspace on most map views available on Cloudstreet, including flight view and task management.

To activate airspace select the desired airspace file from the airspace selector available on the map toolbar.

To turn airspace off, select the off option. Alternatively you can select to temporarily disable the airspace map layer, from the map layers control

You can click on an airspace's shape to view further information.

Airspace files

A collection of gliding community-sourced airspace data is available for your convenience, but you may also choose to view your own custom airspace files. There are two modes of airspace data selection, auto and custom. If you select auto from the airspace selector, the airspace data required will be automatically loaded from the server. By default this data consists of the community-sourced data set, but you may choose to add as many of your own files you want to this, or even disable the community data and display only data from the files you specify. For more information on how to change the auto airspace setting see the relevant section below.

The other option is to specify an airspace file explicitly and have only data from this file displayed.

Airspace display options

To modify the airspace display options, click on the airspace icon on the airspace selector.

You will be able to set what airspace is defined according to the following criteria:

You can choose to save these settings by pressing the Save as default button. If you do this, the saved settings will be loaded and applied each time you display airspace on a map.

Working with airspace files

To modify your auto airspace settings or work with custom airspace files go to the My files page and select the Airspace tab to view the Airspace pane.

From here you can select to view an airspace file and examine or modify its individual airspace blocks.

To select the current airspace file, choose the desired one from the airspace file selector.

Importing airspace files

To import a custom airspace file, click on the + button next the airspace selector and choose the "Import file" option or choose "Import airspace" from the File menu.

You can press the "Choose files" button to choose one or more files, or simply drag and drop the required files from your file explorer. You can import as many files as you want at a time. The following airspace file formats are currently supported:

If you have choice between formats it is recommended you use the SUA version as it allows for a richer definition of airspace types.

You may rename airspace files after importing if you wish by selecting "Edit attributes" from the File menu.

Defining Auto airspace selection

To set the files included in the auto airspace selection, click "Auto airspace settings" in the File menu.

Check the boxes of the files you want to be included in the auto selection. If you would like to disable the community-sourced airspace data, uncheck the "Default airspace option".

Please note that files will be loaded only if required by a specific map view, so it is safe to check as many files as you want without adversely affecting your browser's performance. In fact it is better practice to have several files, each for a specific country or location, rather than one file for all the world, as this would mean that all of the data would load from the server each time.

Airspace blocks

An airspace file is divided into individual airspace blocks. Each block has a specific set of parameters, such as airspace type or class, an altitude band and a specific geometry that describes it.

You can select individual airspace blocks from the block list on the left by clicking the required block box. You can also scroll through the block list by using the arrow keys and hit ENTER to select the highlighted block.

An airspace block has the following properties:

There are a number of ways to classify airspace, reflecting a number of different practices in use around the world. The way this classification is codified in airspace files used by the gliding community also varies, so not all of the classifications available are supported by all airspace formats. For a more specific discussion of what each individual file format supports please see the following list:

An airspace block can have both a type and class, defining both its type of use and access rights, although files in the gliding community typically specify one or the other. A block must also have a specified base and top. By default, a block's base is the surface of the earth and the ceiling is unlimited. The following options for defining a block's base or top also exist:

The following tables describe how airspace blocks are shown on the map. An airspace type defines the block's border style while an airspace class, if available defines the block's fill and border color.

Airspace types

Type Appearance
Glider prohibited


Type Appearance
Training zone
Glider Sector
Wave Window

Airspace classes

Type Appearance
Class A
Class B
Class C
Class D
Class E
Class F
Class G

Airspace filter and search

You can define which types of airspace blocks are currently displayed by using the airspace filter. To activate the filter click on the button on the toolbar.

The filter allows you to set the following criteria:

Please note that this filter does not affect the settings or defaults used when viewing airspace in other areas such as a flight map.

To locate an airspace block by name, you can use the search box on the top left of the toolbar. You need only enter part of the name and you will be supplied with a list of options to choose from.

Editing airspace

To edit a block, double click on a block box, or select the edit mode button from the toolbar to edit the currently highlighted box.

Cloudstreet uses a proprietary language code to define airspace block geometry. This is compatible with all file formats commonly available.

Each block of airspace is of one of the following geometry types:

Only one of the three types may be used for a single airspace block. The polyline is typically a closed shape so its last point should be the same as the first point, although this is not necessarily the case for borders.

The syntax for each of the types is the following:

Circle block

C <radius in nautical miles> <latitude> <longitude>
C 4.7 N311917 W0852659


A polyline consists of a series of straight lines and arcs.

A series of lines is specified as a lits of consecutive points. Point definition uses the following syntax:

<latitude> <longitude>
N494956 E0074145

A compete block consisting of a series of lines would be defined as follows:

N493138 E0082254
N493105 E0083906
N492505 E0083836
N492538 E0082228
N493138 E0082254

An arc is defined by the circle is belongs to, the points the curve starts and finishes at and the direction of turn around the circle one takes to go from the first point to the second (i.e. clockwise or anti-clockwise). The syntax is as follows:

<start-point lat> <start-point lon>
<turn-direction: + for clockwise or - for anti-clockwise> <arc radius in nm> <center lat> <center lon>
<finish-point lat> <finish-point lon>
N485347 E0092913
+ 16.6 N484119 E0091239
N483854 E0093725

The starting and finish point of an arc are also the same points that define the preceding geometry. A complete block consisting of a series of lines and arcs would be defined as follows:

N484652 E0085255
N485347 E0092913
+ 16.6 N484119 E0091239
N483854 E0093725
N483429 E0092520
N482943 E0090020
+ 14.2 N484119 E0091239
N484652 E0085255

Airway block

An airway block consists of a series of straight lines and is specified by the points that define them. The difference of an airway block to a polyline airspace block is that the shape of the airway defines an area of a specific width centered on the line that defines it as the active airspace. To distinguish an airway block from a polyline, the definition starts with the width of the block. Airspace blocks do not currently support arcs.

W <airway width in nautical miles>
<latitude> <longitude>
<latitude> <longitude>
W 10
N510656 E0092716
N510540 E0093100
N510030 E0092630
N510144 E0092249

Point coordinates are defined as degrees, minutes, seconds along with the cardinal orientation (N or S for latitude, E or W for longitude), according to the following format:

Lat syntax:
Lon syntax:

The orientation may be specified before or after the coordinates but must be adjoining, e.g. N454652 E0132716 is equivalent to 454652N 0132716E.

Units are in nautical miles.

Most airspace blocks, with the exception of airways or boundaries must be closed shapes in order to work properly, i.e. the last point defined must be equal to the first point of the shape.

You can use the standard selection, deletion and revert tools for airspace blocks as you do for other objects such as waypoints or tasks. These options are available through the Blocks menu and corresponding toolbar buttons. You can also copy or move the selected blocks to another airspace file.

When making modifications to airspace file blocks, your changes are not immediately saved. You can switch between airspace files by using the airspace selector and your changes will not be lost, but you must press the Save button on the toolbar to save your changes before navigating away from the page. When you choose to save your modified data, changes to all airspace files modified will be made at once. If you have modified several airspace files but do not want to save the changes in all of them, select the files you want to avoid changing and press "Revert to Saved" from the File menu to revert the chosen file back to its saved state. Once you have done this for all files which you have modified but do not want to save, you can then press Save to save the files that are is still modified.

If you choose to navigate away from the page without saving edited data, you will receive a warning from the browser. If you do not mind losing the data, agree to navigate away from the page.

Airspace file controls

You can manage airspace files, through the File menu. You can create new files, copy files, revert entire files to the version saved on the server. You can also edit a file's attributes which are its title, version and attribution. It is suggested you use the version entry to record information on when the file was last reviewed or what dates the airspace information contained in the file applies to. The attribution entry can be used to record data ownership or source information.

There is also a notes entry for each airspace file. You can use the notes to record more extensive information about the airspace file. When a file is imported, the comments at the beginning of the file are automatically added to the notes entry. The notes are also added at the head of each exported file as comments.

You can view and edit the notes by selecting "View notes" from the File menu. To persist any changes made, press Save before exiting the notes. Notes are saved separately from other airspace file modifications.

Exporting airspace files

To export an airspace file, select "Export airspace" from the File menu or press Ctrl+X. You will be presented with a list of supported file formats. Click on the file format required to download the file.

The following export file formats are currently supported:

Please note that the saved version of a file is the one exported. If you have made modifications to a file and want to export them, you must first save the file.

When exporting a file, the file notes are added a the top as comments.