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Site creation

Use the menu 'New / Site' or double-click on the map.

Undirected link creation

Undirected links are only pairs of end points. Use the menu 'New / Undirected Link', or, equivalently:

• double-click on a site's marker on the map to start drawing the geodesic to receiver site;
• double-click on another site's marker to define the receiver site and the undirected link between both sites.

Right-click anywhere on the map in order to cancel new undirected link creation.

Radio graph creation

Use the menu 'New / Radio Graph'.

Adding a (directed) link to a radio graph

You may either:

• right-click on an undirected link's marker and select 'Add Undirected Link To Radio Graph'. If the direction is ambiguous (e.g. when adding the very first link in an empty radio graph), you will be asked to select a direction.
• You may also right-click in the left panel where lay the various tree views and select 'Add to radio graph'; if you right-click on the name of a radio graph or the name of an undirected link, this name will be selected in the relevant drop-down within the modal which will open.

Links

Links can be defined over an undirected link. In order to do so, right-click on any geodesic drawn on the map, and select 'Define New Link over this Undirected Edge'. Such links can also be reviewed through the context menu item 'Show Links defined over this Undirected Edge'. They may be directed (e.g. microwave links) and an undirected link can underlie links directed in both ways, as well as links which are not directed (e.g. fiber links).

Tags

Tags can be applied to sites, undirected edges (geodesics), links (fiber or license) and radiographs. Tags themselves are created (please read Stéphane's instructions about tags creation) through the menu item 'New > Create / Remove Tag' (requires specific privileges - this item is not visible otherwise). They can also be reviewed through the menu item 'View > Tags'.

Search

The query language is similar to Google's one. It supports '-' for exclusion and the scope can be restricted with prefixes, e.g. 'site:' or 'link:'. 'and' is the default when items are separated with spaces. 'or' should be explicitly mentioned when required. Parenthesis and wildcards (*) are also supported (e.g. site:*).

What are the searchable classes?

• site objects with 'site:'
• undirected-edge objects with 'edge:'
• radio-graph/network objects with 'radiograph:'
• links objects (i.e: fiber and licences) with 'link:'

What is the meaning of those main searchable objects ?

• sites are a doted point on map characterized by a position in WGS84 coordinates a name that is not unique and an integer ID that is a unique ID attributed automatically across all sites, plus "optional" extra data
• undirected edges (also called geodesics) are just a tuple of 2 sites (identified by unique ID because there can be two site named Paris one in France and one in Texas)
• radio-graphs are a directed acyclic graph with only one root. Basically almost like trees. It's data representation is an adjacent list (who is the previous site and who is the next site) with information about geodesic length calculated on modification. This allow the display of tree representation of the graph on left panel to show minimal distance difference with direct geodesic paths (best possible path). If the graph is not a tree (is re-branching somewhere like in FR2 to LON for example) the tree representation will show the minimal distance spanning tree.
• links are defined over undirected edge to add data over them we have two kinds of links fiber ones and licenses for microwave/millimeters radio ones

How is distance calculated in Pegasus ?

Pegasus relies internally on the state-of-the-art C.F.F. Karney's algorithms found here and implemented in the GeographicLib library. We are quite confident that measurements provided by Pegasus can be trusted. One must be careful when comparing will Google Earth distances. Actually Google Earth provide different distances implementation.

• a 'map length'
• and something termed as 'ground length'

Using Google Earth's 'Ruler' tool to measure the path you are considering you should get the same result as the one provided by Pegasus. Here is what Google's Timothy Whitehead has to say about these two measurements: https://www.gearthblog.com/blog/archives/2011/09/measuring_distances_with_the_google.html The figure found in the path properties is in Google Earth's words a 'ground length'. One may wonder why both the ground length displayed in the 'Ruler''s results can be lower than the 'map length'. This may look surprising at first. But one has to remember that the map length is computed over a theoretical ellipsoid, whereas Google Earth's 'ground length' pretends to be using elevation data to compute the distance along the ground. But we have no idea about the quality of elevation data when looked at at this scale. It is doubtful that they are good enough to lead to a very accurate final results when integrated along a line 'clamped to the ground'. Here is why the figure found in the path's properties is a 'ground length': when you use the 'Ruler' tool, you can save the line you drew as a path; just after clicking on the 'Save' button, go to 'Measurements' in the newly opened window, and you'll find the same figure as the one displayed among the Ruler's results under the label 'ground length'. This calculation seems to be very sensitive.

Pegasus version: v1.2.0-ext

Select a site:

Select a site:

Start typing to have autocompletion. Note that proposed sites are filtered by search on map Create...

Name:

Create...

Select target radio graph

Select undirected edge to add

You have selected to add a directed edge to the radio graph '' based on the undirected edge between:

• ''
• and ''.

Please select direction for this edge from the following drop-down:

Select direction of the edge

Add...

Select a radio graph

You have selected to add a directed edge to the radio graph '' based on the undirected edge between:

• ''
• and ''.

Please select direction for this edge from the following drop-down:

Select direction of the edge

Add...

Select a radio graph

Duplicate...

Select a radio graph

Delete...

Please confirm you want to clear selected undirected edge between from everywhere ?