Comments on: Qualitative vs. Sequential Color Scales

By: Jim Walls

Jim Walls — Tue, 24 May 2011 23:32:30 +0000

My first questions are who is going to use this map and how are they going to use it. Whilst the data does not seem categorical, it may be to the user. Ordinal data, and particularly so in this case with travel time hours broken into 13 divisions, can be very like categorical data. If the user is looking at a specific part of the map to see how long the flood waters will take to get there then being able to allocate to a category is far more important than trying to estimate the number of hours based on the tone of what would almost appear to be continuous data when subdivided into 13 categories. Aesthetically more pleasing though that may be, it may make for a less useful product.

By: corey

corey — Mon, 23 May 2011 20:07:56 +0000

Furthermore, the Rogowitz PDF from the IEEE website is in black and white. The following alternative link might be helpful:
http://www.research.ibm.com/people/l/lloydt/color/color.HTM

By: Robert Simmon

Robert Simmon — Mon, 23 May 2011 19:43:47 +0000

Thanks Corey, it’s fixed now.

By: corey

corey — Mon, 23 May 2011 19:29:42 +0000

The link to the your PDF “Use of Color in Data Visualization” is not working.