turbo-cartocss examples

Color ramps: *-fill

Basic usage

marker-fill: ramp([column_name], colorbrewer(Greens));
                  |                    |
                  v                    |
      column to calculate ramp         |
                                       v
                it will use a color ramp from http://colorbrewer2.org/

Change number of color brewer data classes

marker-fill: ramp([column_name], colorbrewer(YlGnBu, 7));
                                                     |
                                                     v
                                          force number of classes
                                            default: 5 classes

Change quantification method

marker-fill: ramp([column_name], colorbrewer(Reds), jenks);
                                                      |
                                                      v
                                         force quantification method
                                             default: quantiles

Numeric ramps: *-width, *-opacity

Basic usage

marker-width: ramp([column_name], 4, 18);
                   |              |   |
                   v              |   |
       column to calculate ramp   |   |
                                  v   |
           start value for the ramp   |
                                      |
                                      v
                            end value for the ramp

Change quantification method

marker-width: ramp([column_name], 4, 18, equal);
                                           |
                                           v
                               force quantification method
                                    default: quantiles

Change number of buckets

marker-width: ramp([column_name], 4, 18, 6);
                                         |
                                         v
                              force number of buckets
                                    default: 5

Change both: number of buckets and quantification method

marker-width: ramp([column_name], 4, 18, 6, jenks);
                                         |    |
                                         v    |
                   force number of classes    |
                                              v
                                 force quantification method

Options

Quantification methods

• quantiles: as per CDB_QuantileBins.
• equal: as per CDB_EqualIntervalBins.
• jenks: as per CDB_JenksBins.
• headtails: as per CDB_HeadsTailsBins.