Graphs

The graph(s) provide historical position information for the receiver, showing the selected data source over time.

Select Receiver Status / Graphs.

 

Data Source – Height, East, North, Horizontal, East/North, PDOP/# SVs, Heading, Age of Corrections, MSS (RTX, OmniSTAR).

Data Rate – Determines which data buffer is used. The receiver has two buffers, both buffers are volatile so reset if the receiver is restarted.

  • 10-Second Positions – The “10-Second” buffer contains data for up to the last 24 hours at 10 second intervals. The graphs displayed update every 10 seconds as new data is sent from the receiver to the browser.

  • High Rate Positions – The “High Rate” buffer is 5,000 elements long and contains the last 5,000 positions the receiver computed. The time-span depends on the position rate of the receiver. Once the graph is drawn, data is sent from the receiver to the browser at the position rate, so the graphs update in real time only, subject to network and browser latencies.

Other Operations

  • Zoom in – Click in the graph area, hold down the mouse and then define the area you want to zoom into. Release the mouse. The plot zooms in to the selected area.

  • Zoom out – Right-click. From the shortcut menu, choose to zoom to the previous zoom level, zoom to the original view, or zoom out by a factor of 2. You can do this numerous times to make the graph canvas larger than the original view. The keyboard shortcuts are: p-previous, r-reset view, and o-zoom out by a factor of 2.

  • Save image as – Right-click and select Save image as.

Data Handling – If you do not change the data view and the browser does not redraw the view, new data is added to the graph without a redraw. If a redraw is done for any reason, only data cached by the browser is re-drawn. The browser has an 18,000 point historical buffer of points it will attempt to redraw. When the buffer is full, old points are dropped.

Symbol key – The cyan-colored cross shows the current position. The red-colored cross shows the receiver’s reference position. If no reference position is present, then the red cross does not appear.