The linear and adjusted progression color ramps are similar
in their intervals and have a six-class sequential color scheme. In the linear
progression, the intervals are evenly placed and calculated by subtracting the
class low end from its high end and then dividing the result by 5 to get the
intervals. In doing this the results make each separation between the classes
25. The linear progression is easy and simple using the formula. For the
adjusted progression, the interval is random and has no specific formula to
determine the intervals. I used the intervals from the lab example which followed
the rough guideline of 1/3 higher than the largest interval and 1/3 lower than
the smallest interval. The ColorBrewer site was easy, with a few clicks I got a blue-to-green multi-color scheme complete with RGB values. Afterward, the color
ramp was created in Arc Pro using the RGB values found in the color ramp. The
great thing about this site is its ease of use but it also is an “at a glance” way
of understanding color ramps.
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| Linear Progression |
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| Adjusted Progression |
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ColorBrewer composed
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Once I had these the field calculated I went into primary symbology
and chose Graduated Colors and Natural Breaks with 7 classes. The 7 classes
were defaults, but I changed the percentages to make sense by removing the extra
decimal places. For the ranges, the negative changes in population had a greater
number at the end than the positive. I felt it was best to leave the numbers as
they were because they were not large numbers and made sense of what was
produced in the results. I chose 7 classes because there should be a middle label/color
for 0 since the data has negative and positive percentages.
For the legend, I removed the word legend and the layer name.
I left the label (layer name) in the legend and renamed it so the data can be
interpreted more easily. I added the legend at the bottom of the map dragging
it wide enough for it to be displayed across the bottom of the page. I had
trouble removing the label (layer name), which is why it is on the map. If I could
have removed it, then the legend would have looked more balanced with the
symbology filling the bottom of the page.
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