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Fun with Torque
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torque.md

Data: Denver Traffic Accidents

Go to your traffic_accidents table and let's start by creating a new visualization

Imgur

Overview of the Torque Wizard

key things

  1. When does it require new server requests?

  2. Overview of duration, steps, trails, resolution

Torque Category

Imgur

Advanced Torque

frame-offset

#traffic_accidents[frame-offset=2] {
 marker-width:10;
 marker-fill-opacity:0.225; 
}

Links directly with -torque-frame-count:512;

The Map element

Map {
-torque-frame-count:512;
-torque-animation-duration:30;
-torque-time-attribute:"cartodb_id";
-torque-aggregation-function:"CDB_Math_Mode(torque_category)";
-torque-resolution:2;
-torque-data-aggregation:linear;
}

The aggregation-function

It's SQL embedded in CartoCSS!

CDB_Math_Mode(district_i)
-- or
count(*)
-- or
sum(income)
Using the stored values of aggregation for style
#traffic_accidents[value=1] {
   marker-fill: #A6CEE3;
}

Categorical maps

Imgur

Categorical maps bring together the aggregate function and CDB_Math_Mode to create predictable values for styling. Let's take a look

Map {
-torque-frame-count:512;
-torque-animation-duration:30;
-torque-time-attribute:"cartodb_id";
-torque-aggregation-function:"CDB_Math_Mode(district_i)";
-torque-resolution:2;
-torque-data-aggregation:linear;
}

#traffic_accidents{
  comp-op: source-over;
  marker-fill-opacity: 0.9;
  marker-line-color: #FFF;
  marker-line-width: 1.5;
  marker-line-opacity: 1;
  marker-type: ellipse;
  marker-width: 6;
  marker-fill: #FF9900;
}
#traffic_accidents[frame-offset=1] {
 marker-width:8;
 marker-fill-opacity:0.45; 
}
#traffic_accidents[frame-offset=2] {
 marker-width:10;
 marker-fill-opacity:0.225; 
}
#traffic_accidents[value=1] {
   marker-fill: #A6CEE3;
}
#traffic_accidents[value=2] {
   marker-fill: #1F78B4;
}
#traffic_accidents[value=3] {
   marker-fill: #B2DF8A;
}
#traffic_accidents[value=4] {
   marker-fill: #33A02C;
}
#traffic_accidents[value=5] {
   marker-fill: #FB9A99;
}
#traffic_accidents[value=6] {
   marker-fill: #E31A1C;
}
#traffic_accidents[value=7] {
   marker-fill: #FDBF6F;
}

Bubble maps

Values are calculated within each geotemporal bin. So, the combination of -torque-frame-count and -torque-resolution

Imgur

Let's take a look at one to start,

Map {
-torque-frame-count:256;
-torque-animation-duration:30;
-torque-time-attribute:"first_occu";
-torque-aggregation-function:"count(cartodb_id)";
-torque-resolution:2;
-torque-data-aggregation:linear;
}
#traffic_accidents{
  comp-op: lighter;
  marker-fill-opacity: 0.9;
  marker-line-color: #FFF;
  marker-line-width: 0;
  marker-line-opacity: 1;
  marker-type: ellipse;
  marker-width: 1;
  marker-fill: #F84F40;
}
#traffic_accidents[value>2] {
 marker-width:2;
}
#traffic_accidents[value>3] {
 marker-width:4;
}
#traffic_accidents[value>4] {
 marker-width:8;
}
#traffic_accidents[frame-offset=1] {
 marker-width:2.5;
 marker-fill-opacity:0.2; 
}
#traffic_accidents[frame-offset=2] {
 marker-width:4.5;
 marker-fill-opacity:0.1; 
}
Discrete continuous bubbles

Imgur

A look at the Map element

Map {
-torque-frame-count:24;
-torque-animation-duration:30;
-torque-time-attribute:"first_occu";
-torque-aggregation-function:"count(cartodb_id)";
-torque-resolution:16;
-torque-data-aggregation:linear;
}

And setting up the bubbles

#traffic_accidents{
  comp-op: lighter;
  marker-fill-opacity: 0.9;
  marker-line-color: #FFF;
  marker-line-width: 0;
  marker-line-opacity: 1;
  marker-type: ellipse;
  marker-width: 1;
  marker-fill: #F84F40;
}
#traffic_accidents[value>3] {
 marker-width:2;
}
#traffic_accidents[value>5] {
 marker-width:3;
}
#traffic_accidents[value>7] {
 marker-width:6;
}
#traffic_accidents[value>10] {
 marker-width:8;
}
Torque-Zero

Back to the category map

Map {
-torque-frame-count:1;
-torque-animation-duration:0;
-torque-time-attribute:"cartodb_id";
-torque-aggregation-function:"CDB_Math_Mode(district_i)";
-torque-resolution:1;
-torque-data-aggregation:linear;
}

#traffic_accidents{
  comp-op: source-over;
  marker-fill-opacity: 0.9;
  marker-line-color: #FFF;
  marker-line-width: 1.5;
  marker-line-opacity: 1;
  marker-type: ellipse;
  marker-width: 6;
  marker-fill: #FF9900;
}
#traffic_accidents[value=1] {
   marker-fill: #A6CEE3;
}
#traffic_accidents[value=2] {
   marker-fill: #1F78B4;
}
#traffic_accidents[value=3] {
   marker-fill: #B2DF8A;
}
#traffic_accidents[value=4] {
   marker-fill: #33A02C;
}
#traffic_accidents[value=5] {
   marker-fill: #FB9A99;
}
#traffic_accidents[value=6] {
   marker-fill: #E31A1C;
}
#traffic_accidents[value=7] {
   marker-fill: #FDBF6F;
}

Better control over intensity/heat maps

Imgur

Map {
-torque-frame-count:1;
-torque-animation-duration:0;
-torque-time-attribute:"cartodb_id";
-torque-aggregation-function:"count(district_i)";
-torque-resolution:1;
-torque-data-aggregation:linear;
}

#traffic_accidents{
  comp-op: source-over;
  marker-fill-opacity: 0.9;
  marker-line-color: #FFF;
  marker-line-width: 0;
  marker-line-opacity: 1;
  marker-type: ellipse;
  marker-width: 2;
  marker-fill: #FFCC00;
}
#traffic_accidents[value>1] {
   marker-fill: #FFA300;
}
#traffic_accidents[value>2] {
   marker-fill: #FF9900;
}
#traffic_accidents[value>3] {
   marker-fill: #FF5C00;
}
#traffic_accidents[value>4] {
   marker-fill: #FF6600;
}
#traffic_accidents[value>5] {
   marker-fill: #FF2900;
}

Animated grids (bonus)

Create new column offense_n, type number

Imgur

Run the following update:

UPDATE traffic_accidents SET offense_n = 1 WHERE offense_ty = 'traf-vehicular-homicide';
UPDATE traffic_accidents SET offense_n = 2 WHERE offense_ty = 'traffic-accident-dui-duid';
UPDATE traffic_accidents SET offense_n = 3 WHERE offense_ty = 'traf-vehicular-assault';
UPDATE traffic_accidents SET offense_n = 4 WHERE offense_ty = 'traffic-accident';
UPDATE traffic_accidents SET offense_n = 5 WHERE offense_ty = 'traffic-accident-hit-and-run';

And the header:

Map {
-torque-frame-count:64;
-torque-animation-duration:30;
-torque-time-attribute:"first_occu";
-torque-aggregation-function:"CDB_Math_Mode(offense_n)";
-torque-resolution:16;
-torque-data-aggregation:linear;
}

#traffic_accidents{
  comp-op: source-over;
  marker-fill-opacity: 0.6;
  marker-line-color: #FFF;
  marker-type: rectangle;
  marker-width: 8;
  marker-fill: #FF9900;
}
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