a series of unfortunate maps, and how to fix them

A SERIES OF UNFORTUNATE MAPSAND HOW TO FIX THEM WITH CARTO BUILDER

SUPPORT TEAM MANAGER & SOLUTIONS ENGINEERJORGE SANZ - jorge@carto.com

HOW TO VISUALIZE ALL NON-DOMINANT CATEGORIES

FROM A 10M DATASET

PROBLEMS1. COUNT(*) = 9,855,4202. COUNT(DISTINCT category) = 2943. COUNT(*) WHERE category ~* ‘telefonica’ = 4,141,7124. Row order

Density map with a 30 % subsampleand screen blending

v0

Category map with a 30 % subsample

v 1

ORDERING1. Normalize categories.2. Create a simple table like this one:

3. JOIN the original dataset with this new table, using the category column as foreign key.4. ORDER the table by category column setting ASC in order to show the categories with less rows first.

category order

telefonica 1

vodafone 2

orange 3

yoigo 4

other 5

STYLINGYou can change marker opacity to change the visual prominence of a category

Markers on top can be more transparent than the ones at the bottom

HOW TO SHOW MANY POINTS THAT SHARE

THE SAME LOCATION

PROBLEMS 1. POINTS SHARING SAME LOCATION2. NO INTERACTIVITY

HEATMAP

SPIDERINGCLUSTERING

STACKING CHIPS1. PostGIS:

● GROUP BY the_geom● ORDER BY y-axis● Generate p value

2. CartoCSS (or Javascript):● Translate● Offset based on zoom

level

JSON on SQL and loops on popups

AGGREGATING POINTS

1. Aggregate one field:● json_agg()

2. Aggregate several fields:● json_agg(row_to_json())

HOW TO SYMBOLIZE DIFFERENT ATTRIBUTES ON THE

SAME LAYER GEOMETRY

PROBLEMS 1. TOO MANY VARIABLES WITHOUT HIERARCHY2. SAME LAYER GEOMETRY

Tools to filter data in real-time to identify trends & relationships

WIDGETS

Visualize the multi-dimensional nature of your data in real-time

AUTO-STYLE

TURBO CARTO

polygon-fill: ramp([masters_degree],cartocolor(PurpOr),quantiles(5));

Thematic map styling with a single line of code

TURBO CARTO

[masters_degree <= 0.451523545706371] {polygon-fill: #6c2167;}[masters_degree <= 0.200426439232409] {polygon-fill: #a24186;}[masters_degree <= 0.137369033760186] {polygon-fill: #ca699d;}[masters_degree <= 0.0843373493975904] {polygon-fill: #e498b4;}[masters_degree <= 0.0418410041841004] {polygon-fill: #f3cbd3;}

Designed specifically for use with CARTO basemaps or not...

CARTO COLORS

Data driven color schemesCARTO COLORS

SEQUENTIAL

DIVERGING

QUALITATIVE

CONCLUSIONS

SUPPORT TEAM MANAGER & SOLUTIONS ENGINEER

THANKS!

A SERIES OF UNFORTUNATE MAPShttp://bit.ly/170719-unfortunate-maps

JORGE SANZ - jorge@carto.com