Page 22 - Fuel Cell Student Edition

This data is easily captured in a tabular format. The heightmap contains the minimum and
In the simulation spreadsheet there will be three maximum altitudes for the range of color values
columns (value, X, and Y). Value is the color value (-1600 to 600m). ImageJ’s analyze/histogram tool
(0-256 typically), X is the x-coordinate, and Y is the will show the minimum and maximum color values.
y-coordinate of the image.
Now the distance of 1 pixel needs to be defined
It would also be beneficial to keep track of the so that measurements in the horizontal plane
measurement by number so we know which can be made. Shackleton Crater at the bottom
measurements are the first and last to indicate of the map is 21 km across and almost perfectly
direction of travel. Use the multipoint tool and the circular. Measuring between the two points on
menu function analyze/measure to collect the data opposite sides of the rim in Image J should give
points. a length of about 117 pixels resulting in a scaling
factor of 5.57 pixels per kilometer or 0.0058 pixels
The value component of the image must be per meter. We can scale the measurements in
converted into an actual altitude. The formula to 3-dimensions, so measuring the distance between
map one range of values to another is: them is now possible. Create two new columns
in the spreadsheet for scaled X and scaled Y
measurements, and then apply the following
formulas:

22 TOTAL REDOX™ – FUEL CELLS TOTAL REDOX™ – FUEL CELLS 23