Charts must be meticulously organized, featuring clear labeling, efficient search functionalities (where applicable), intuitive navigation systems, effective filtering mechanisms, and legible text sizes to ensure optimal accessibility and user comprehension.
Differentiation in line graphs/charts
The more detailed the graph is, the mode elements/nodes it has
Objects that look alike will be identified as a part of a group (ex. Boxing bars help readers identify groups)
Volume, curvature, shading, and color allow more generic judgments
Metrics numerical filters
Groups are text-based, such as type of employee, list of items, etc.
Time-based filters, such as months, quarters
Gradients are ok for sequential rates
Rarely use 3D
Color has meaning, and High-contrast colors are used
Sequential when you are ordering values from low to high.
Divergent when the values are ordered, and there is a critical mid-point (e.g., an average or zero).
Categorical when data falls into distinct groups (e.g., countries) and therefore requires contrast between adjacent colors.
Accessibility For accessibility, if there are non-text-based interactive, graphic, or image-based charts, there must be a text-only chart underneath or hidden (but readable for screen readers) and an alternative text description displaying detailed data relating to the chart.
Data Visualization Guidelines: When to use...
