Colorbar for categorical data

30 Ansichten (letzte 30 Tage)
Claire
Claire am 2 Apr. 2014
Kommentiert: Image Analyst am 3 Apr. 2014
I have a spatial, categorical dataset that I have plotted up using pcolor. The dataset contains latitude, longitude and vegetation type data. Vegetation type is an arbitrary number between 1 and 19 that corresponds to a vegetation label.
I am looking for a way to create a colorbar "legend" for this data.
At the moment, when I use pcolor and add a colorbar, I get a bar that goes from 1 - 19 with all the different colours in between. This colorbar means nothing because the data are not ordinal.
I am hoping to find a way to make little boxes for each individual color, and put a label next to the box. Something like the maps of Australia seen on this site http://www.environment.gov.au/node/22149
Is there a way to code this in Matlab, given that I have 19 different vegetation types, and putting labels next to the colorbar would be too busy?
Thanks for your help.

Akzeptierte Antwort

Image Analyst
Image Analyst am 2 Apr. 2014
Have you seen the demo for colorbar where they change the labels from numbers to some custom words? Try that:
surf(peaks(30))
colorbar('YTickLabel',...
{'Freezing','Cold','Cool','Neutral',...
'Warm','Hot','Burning','Nuclear'});
  3 Kommentare
Claire
Claire am 3 Apr. 2014
Thanks for your help.
The problem with that solution is that it only works when you have a small number of categories. I have 19 in total, and when you try to label the colorbar directly, it just becomes a big mess.
I need to find another way to do this that works for a large number of labels.
Image Analyst
Image Analyst am 3 Apr. 2014
If you're going to have 19 segments over a screen size, or a certain height on the paper, then the only way is to have the font size be smaller. Do you not consider your example to be a mess? Why not? Because the letters are separated? Well they are small font sizes - it's a tradeoff.

Melden Sie sich an, um zu kommentieren.

Weitere Antworten (0)

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by