Research Proposal Augmented Reality Visualization of Outdoor Environmental Corrosion
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| Figure 9 The ‘(rust) crystal’ representation, showing three stages (left-to-right) of the corrosion (15%, 35% and 70%)
It was envisioned that numerous crystals would semi-randomly ‘grow’ out of a sensor, with their size and complexity (and thus visibility) indicating the amount of corrosion present at that position.  
Figure 10 The revised Box (second revision) and Gauge (fourth revision) sensor visualizations Concerns were noted regarding the different size scales for the inner and outer measures semi-circles, however informal evaluations have found users can accurately read the value of attributes despite the varying scale. Initial informal reviews of the prototypes (Figure 11) have been promising, with feedback indicating the plasma effect as an effective and intuitive indicator for corrosion. Concerns for the crystal obscuring the sensor’s readability, along with ambiguity as to its meaning were also raised. Following feedback, the colour scheme of the Box has been changed to use a more traditional blue-red colour spectrum to represent inside and outside temperatures. The requirement for users ‘guessing’ a value based on the Box’s colour scheme was a primary driver behind the development of the Gauge, which facilitates the reading of sensor values within an acceptable error range.  
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