Displaying Graphs
Next: Implementation
Up: Design Considerations
Previous: Widget Selection
Once a simulation has completed, the user can view the generated data
in a graph displayed on the screen.
Each graph contains a statistic for a given cover type
based on the output map generated. The supported statistics include:
- Proportion of Landscape,
- Area of Covertype,
- Edge/Area Ratio,
- Edge of Covertype Pairs,
- Number of Patches,
- Mean Patch Size,
- Standard Deviation of Patch Size,
- Largest Patch,
- Mean Patch Shape, and
- Distribution of PatchSize.
Any of the above listed statistics can be displayed for each of the cover
types found on the map. There is one graph available for each statistic
for each
cover type, making the number of possible graphs quite large.
Because of the large
number of possible graphs, the graph selection window was separated into
two possible selection boxes - one for the cover type and one for the
statistic (see Figure
). The user selects the cover
type that he/she is interested in and
then selects the statistic to be graphed. The graph
of the statistic for the chosen cover type is displayed using
version 11.3.2 of xgraph, a
public-domain graphing
tool for X Windows systems [Har89].
Figure: LUCAS Graphs Menu.
By receiving input from the user with the
use of two selection boxes, the user is not required to enter a
selection from the keyboard. In this way, the user cannot make a wrong
selection when indicating which graph should be plotted on the screen.
Another advantage is that the user does not have to consult a user
manual to determine the set of available choices.
Brett Hazen (hazen@cs.utk.edu)
Wed Jan 11 12:40:20 EST 1995