Of Nodes and Maps (Web Mapping with Drupal - Part II)

Drupal Developer’s Day 2013

OF NODES AND MAPS
Engr. Ranel Padon
ranel.padon@gmail.com | https://github.com/ranelpadon

ABOUT ME
• Senior Software Engineer @ Kite Systems, Ltd.
• Drupal Projects Involvement:
• CNN Travel
• LGIS

• Lecturer, UP DGE (Java/Python OOP Undergrad Courses)
• Lecturer, UP NEC (Web GIS Training Course)
• MS Computer Science (25/30 units)
• Geodetic Engineer
• Involved in computational Java and Python projects
before.

OUTLINE

Views
Integration
Geofield

Motivation

OUTLINE
I. Motivation

II. Geofield
•

Input Widgets

•

Output Formatters

•

Default Geofield formats

•

Leaflet

•

OpenLayers

III. Views Integration
•

Geofield

•

Leaflet

•

OpenLayers

MOTIVATION
• Brain Rules
• Rule #10:
• Vision trumps all other senses.

MOTIVATION
• Brain Rules
Rule #10

“Vision is by far our most dominant sense,
taking up half of our brain’s resources.”
“We learn and remember best through
pictures, not through written or spoken
words.

MOTIVATION
Milky Way Transit Authority

http://arbesman.net/blog/wp-content/uploads/2012/05/Screen-Shot-2012-06-13-at-10.17.58.png

MOTIVATION
London Tube Map

http://www.tubemaplondon.org/images/standard-tube-map-large.jpg

MOTIVATION
MMDA Traffic Advisory

http://mmdatraffic.interaksyon.com/system-view.php

MOTIVATION
Pattern and Temporal Analysis

• Dr. Abraham Verghese
used maps to help think about his HIV infected patients
Making Maps (Krygier, 2011)

MOTIVATION
• Dr. Verghese and his colleagues were stunned when
HIV-infected patients began to dominate their practices.

• What was this urban problem doing in rural Tennessee?

• Dr. Verghese next mapped where his HIV patients lived between 1979
and 1985. The places on the Acquisition map “seemed to circle
the periphery of the United States” and were mostly large cities.
Dr. Verghese learned of a circuitous voyage, a migration from
home and a return, ending in death.

MOTIVATION
Pattern and Temporal Analysis

The acquisition place of Dr. Verghese’s HIV patients.

MOTIVATION
Dr. Verghese’s findings will be hard to came up with if you
will use tables/spreadsheets and charts only, that is, without
using maps for spatial/temporal correlation.

There is something about maps that could not be provided
by text, tables, or charts, or other statistical analysis tools.

Spatial analysis is a deep science on its own.

MOTIVATION
Chernoff Faces
(Multivariate Map)

4 Variables in one map!

http://cartastrophe.files.wordpress.com/2010/06/turner_chernoff.jpg

MOTIVATION
Identifying UFOs


MOTIVATION
Spatial Connotation (Humor)

http://www.jewsnews.co.il/wp-content/uploads/2013/10/1337.jpg

MOTIVATION
News Story

http://www.rappler.com/world/regions/us-canada/38404-us-3-days-attacks-syria

MOTIVATION
Flash News

(Oct 26, 2013)

http://finance.yahoo.com/news/earthquake-hits-near-fukushima-japan-172839930.html;_ylt=AwrSyCPVrGpSCUcAeDTQtDMD

MOTIVATION
Event Location

http://devsday2013-eorg.eventbrite.com/

MOTIVATION
• Drupal Committer’s Location

https://drupal.org/

MOTIVATION
Case Study 1:
LGIS Map 1: Home Page Map
Custom/Precise Image Map +
jQuery Map Hilight

http://iesmanila.com/lgis/

MOTIVATION
Case Study 1:
LGIS Map 2: Adding coordinates in a page
Using OpenLayers Map Input Widget

http://iesmanila.com/lgis/node/27/edit

MOTIVATION
Case Study 1:
LGIS Map 3: Displaying Geofield coordinates
using Geofield’s
Default/Gmap

Output Formatter

http://iesmanila.com/lgis/content/payatas-sanitary-landfill

MOTIVATION
Case Study 1:
LGIS Map 4: Geoportal (Views + Geofield + OpenLayers)

http://iesmanila.com/lgis/geoportal

MOTIVATION
Case Study 2
CNN Travel Map 1: Adding Geofield coordinates
1. WKT
2. Leaflet Input Widget

http://travel.cnn.com/node/130484/edit

MOTIVATION
Case Study 2
CNN Travel Map 2:
Displaying Geofield
using TripAdvisor API
(our sponsor’s API)

http://travel.cnn.com/explorations/escape/destinations/insider-guide-best-madrid-249484

GEOFIELD
• Geofield: https://drupal.org/project/geofield
• Requires geoPHP: https://drupal.org/project/geophp
• Requires ctools (Chaos tool suite):
https://drupal.org/project/ctools
• Installs geofield and geofield_map modules

GEOFIELD
Requires geoPHP and ctools:

GEOFIELD
• Provide widgets for data input and formatters for data
output
• Could be integrated to Entities (nodes/content types,
taxonomy terms, user and comments)

GEOFIELD
• common Drupal fields: text, number, dates, image
• special-purpose field: spatial/geo-related fields
• they are tricky to represent in database, since distance
and area computations are not simple arithmetic
operation and must consider map projection, scale,
styling, etc

GEOFIELD | GEOPHP
• geoPHP is the workhorse library of Geofield

• could read, write, and store location-related
information.
• could compute centroids, bounding-boxes, length,
area, etc.

GEOFIELD

Input
Widget

•Lat/Lon
•WKT
•GeoJSON
•Geolocation
•Map

Geofield
Object

DB Object

Output
Formatter

•Lat/Lon
•WKT
•GPX
•KML
•Map

GEOFIELD
• Create a new content type
(admin/structure/types/add) called Tourist Spot
• Add Name of the Tourist Spot as the Title field and a
new Coordinates field:

GEOFIELD
Coordinates field:
• Field Type: Geofield

• Field Input Widget: Latitude/Longitude

GEOFIELD
Coordinates field:
• Geolocation could provide the Default values
• Could auto-locate the current user via IP Address
• Very useful for real-time data like crime reporting, news
scoop, disaster response, etc.

GEOFIELD
Make a new Tourist Spot content
>> node/add/tourist-spot:
• Name of the Tourist Spot: Taal Volcano
• Description: The Taal Volcano.
• Coordinates:
• Latitude: 14
• Longitude: 121

GEOFIELD
Configure the Geofield display, default formatter:
>> admin/structure/types/manage/tourist_spot/display

GEOFIELD
Configure the Geofield display:
• Latitude/Longitude output formatter

GEOFIELD
• Geofield Map output formatter (uses Google Maps)

http://www.9gag.com

GEOFIELD
• Geofield Map output formatter

GEOFIELD
Common
Input Widgets

• Lat/Lon
• GeoJSON
• WKT

GEOFIELD
Output Formatters
• WKT
• KML
• Geofield Map

GEOFIELD
Output Formatter (Further Customization)
• Make sure to both click the Update and Save buttons.

GEOFIELD
Output Formatter
• Customized Geofield Map

GEOFIELD
For OpenStreet Map output formatter
• install Static Map module
(https://drupal.org/project/staticmap)

GEOFIELD
• The Static Map
output formatter

GEOFIELD
Make sure to add a Static Map configuration before
selecting the Geofield’s Static Map formatter.
(admin/config/content/staticmap/list)

GEOFIELD
Note that you could use a Leaflet input widget for
Geofield (https://drupal.org/project/leaflet_widget), but
the stable version is good for Geofield 1.x only.

GEOFIELD
Leaflet Widget for Geofield

GEOFIELD
Installation surprises:
• Make sure that the downloaded Leaflet Widget plugin has
this structure (capitalized L):

>> sites/all/libraries/Leaflet.widget/lib/Leaflet.draw

http://www.9gag.com

GEOFIELD
Installation surprises:
• Install Leaflet (but don’t download the newest Leaflet plugin from
Leaflet’s main site.)
• Copy the bundled Leaflet from the downloaded Leaflet.widget:
>> sites/all/libraries/Leaflet.widget/lib/Leaflet
• rename it such that the libraries folder also contains leaflet:
>> sites/all/libraries/leaflet

GEOFIELD
• Leaflet Widget for Geofield is tested on Leaflet 0.4.x only
and Geofield 1.x.
• See the related documentation regarding setup and
configuration
• For using the newer & more powerful Leaflet.draw plugin
and some patches for the current module, try to checkout
this fork: https://github.com/acouch/leaflet_draw_widget

GEOFIELD | LEAFLET
• Leaflet’s philosophy:
simplicity, performance and usability.
• It’s the jQuery of Mapping.
• Take advantage of HTML5 and CSS3
• Modular design and readable source code.

GEOFIELD | LEAFLET
It was created by Vladimir Agafonkin

A beautiful product created by a
well-rounded person.

GEOFIELD | LEAFLET
My Leaflet Mashup (integrating Leaflet with jQuery).
You could download the source code here and open the
“leaflet-jquery5.html” file

GEOFIELD | LEAFLET
• Drupal’s Leaflet module has 2 versions:
• 7.x-1.x-dev
• sites/all/libraries/leaflet/leaflet.js

• 7.x-1.0-beta3
• Requires sites/all/libraries/leaflet/dist/leaflet.js

• Either case, you could use the latest Leaflet.js plugin.

GEOFIELD | LEAFLET
• Install Leaflet 7.x-1.0-beta3
• In admin/structure/types/manage/tourist_spot/display
• Set the Coordinates’ field output format to Leaflet

GEOFIELD | LEAFLET
• Configure the Leaflet settings

GEOFIELD | LEAFLET
View the page, by default the zoom level is too high.

You must click the “-” button repeatedly to see the map.

GEOFIELD | LEAFLET
Workaround 1:
• Apply the patch here

This will also include code patch for a more advanced zoom
settings/configurations in the Geofield’s Leaflet output
formatter.

GEOFIELD | LEAFLET
Workaround 2 (Quick and specific zoom):
• Add this line “$map['settings']['zoom'] = 8;”
to /sites/all/modules/leaflet/leaflet.formatters.inc

GEOFIELD | LEAFLET
After the workaround:

GEOFIELD | LEAFLET
• Drupal’s Leaflet More Maps

• Showcase of all the included

maps here

GEOFIELD | LEAFLET
• After installing Leaflet More Maps

GEOFIELD | LEAFLET
After installing Leaflet More Maps (Using Mapbox layer)

GEOFIELD | LEAFLET
Drupal’s Leaflet Markercluster (try also this module)

GEOFIELD | OPENLAYERS
OpenLayers Map object’s components (since it’s modular):
• Map (Base Maps: MapQuest, OSM, GMap, MapBox, etc)
• Layers (Content Types, GPX, KML, GeoJSON, Geofile, etc)
• Style (Marker icons, shadows, line widths, etc)

• Behaviors (Pop-ups, coordinates cursor, show grid, etc)
• Projection (4326, 900913, etc)

• Install OpenLayers
• Select the OpenLayers output formatter for Geofield
• By default, it uses the Geofield Formatter Map

Geofield with OpenLayers output formatter

Geofield with OpenLayers Map input widget:

• Geofield with OL Map input widget (Default):

admin/structure/types/manage/tourist_spot/fields

Geofield with custom OpenLayers map:

>> admin/structure/openlayers/maps


• Clone first the Geofield Widget Map
s

admin/structure/openlayers/maps/list/geofield_widget_map/clone

admin/structure/openlayers/maps/list/geofield_widget_map/clone

PARAMETER

VALUE

Infos

Map Title:
Pilipinas Geofield Widget Map

Center and
Bounds

Centerpoint: 121, 14
Zoom Level: 6

• Select the Geofield map with custom OpenLayers map:
admin/structure/types/manage/tourist-spot/fields/field_coordinates_ol_map_

• The new, custom Geofield OL input widget for adding/editing

Tourist Spot pages
• You may also select the default map value (Latitude, Longitude)

• Geofield with custom OpenLayers formatter map:

• Clone Geofield Formatter Map
s

• Geofield with custom OpenLayers map:
admin/structure/openlayers/maps/list/geofield_formatter_map/clone
PARAMETER

VALUE

Infos

Map Title:
Pilipinas Geofield Formatter Map

Center and
Bounds

Centerpoint: 121, 14
Zoom Level: 7

Layers and
Styles

Base Layer: MapQuest Open Aerial
(Enable and Set to Default)

• Modify the Geofield OL Map formatter

>> admin/structure/types/manage/tourist_spot/display

The modified page with Pilipinas Geofield OL Map
formatter

Modifying the Icon marker:

>>

admin/structure/openlayers/maps/list/geofield_formatter_map/clone

• go to Layers and Styles section

After Modifying the Icon marker’s style:

VIEWS
Views is the make or break of Drupal. Many people find it
to be intimidating and hard. But essentially, it just
answers these 3 questions:
• What?
• Where?

• How?

VIEWS
Views is essentially a view of data.
For example, if you’re in a bar with your friend (which could
be drunk already), and suddenly a woman entered the room
your friend may find the woman gorgeous/sexy, but you
might find it just mediocre/ugly.
In that case, there are 2 different Views or perspective: your
View and your friend’s View; while the data (the Woman) is
the same for both of you, it could be portrayed differently.

VIEWS
In the same way, Views retrieve data from the database,
selects the content types you want (Blog, News, Product,
Tourist Spot), the fields you want (Title, Images, Author,
Location, Price), filter them (filter by category, filter by
price), apply some pre-processing (compute total, aggregate
data), sort them (sort by surname, sort by area, sort by
publication date), and finally display them in a format you
want (list, grid, charts, maps, gallery).
Hence, a same pool of data could be combined and viewed in
many ways.

VIEWS
• What
•

Content Type

•

Fields

• Where
•

Page

•

Block

• How
•

List

•

Table

•

Gallery

•

Chart

•

Map

VIEWS | MAP VIEW
• What
•

Content Type (Tourist Spot content type)

•

Fields (Title, Coordinates, other fields you want to include)

• Where
•

Page (a page via URL: /openlayers-tourist-spot or /leaflet-tourist-spot)

•

Block

• How
•

List

•

Table

•

Gallery

•

Chart

•

Map (OpenLayers or Leaflet)

VIEWS
To appreciate Views, we must create additional Tourist
Spot pages.

These Tourist Spot pages could be shown later in one map
or technically, in one View.

VIEWS
Add the Amanpulo Beach Resort
• Latitude: 11

• Longitude: 121

VIEWS
Add the Mt. Apo
• Latitude: 7

• Longitude: 125

VIEWS | TABLE VIEW
Drupal’s default Content View (admin/content)

VIEWS | TABLE VIEW
Let’s create a custom Table View of Tourist Spot pages for
illustration purposes, before proceeding to Map Views.

VIEWS | TABLE VIEW
Add a Table View
of Tourist Spots

VIEWS | TABLE VIEW
Configure further the Table View
of Tourist Spots

VIEWS | TABLE VIEW
The displayed, custom Table View of Tourist Spots

VIEWS | GEOFIELD
The Geofield data type makes it possible for Views to
display collection of nodes in map format.

Leaflet
Map View

Geofield

Views
OpenLayers
Map View

VIEWS | LEAFLET
• Create a new Taxonomy Vocabulary called Island Group
>> admin/structure/taxonomy/add
• These will be used for categorizing the Tourist Spots

VIEWS | LEAFLET
>> admin/structure/taxonomy/island_group
• These will be used also later as exposed search filters

VIEWS | LEAFLET
Add new View:
admin/structure/views/add

VIEWS | LEAFLET
admin/structure/views/view/leaflet_map_view

VIEWS | LEAFLET
Leaflet View (showing all data), with the Island Group
exposed filter.

VIEWS | LEAFLET
Leaflet View filtered as Mindanao Island Group only:

Single point result in Leaflet Views
will be zoomed too high also.

http://www.9gag.com

VIEWS | LEAFLET
Leaflet View (Single Instance Zoom workaround)
1. Apply patch from here or

2. Add this line $map['settings']['maxZoom'] = "8";

>> /sites/all/modules/leaflet/leaflet_views/leaflet_views_plugin_style.inc

VIEWS | LEAFLET
After the zoom workaround 

VIEWS | OPENLAYERS
For OpenLayers Map View (since OL is modular and highlycustomizable, it involves more steps)

1. Create an OpenLayers Map object (MO)

2. Create a new OpenLayers Map View (MV)
3. Create a new OpenLayers Data Overlay View (DOV)
4. Enable the DOV as Map Layer in MO via

VIEWS | OPENLAYERS
1. Create an OpenLayers Map object (MO)
>> admin/structure/openlayers/maps

VIEWS | OPENLAYERS
2. OpenLayers Map View (MV)

VIEWS | OPENLAYERS
• 2. OpenLayers Map View (MV)

VIEWS | OPENLAYERS
3. OpenLayers Map View (MV)

VIEWS | OPENLAYERS
4. Enable the DOV as Map Layer in MO

VIEWS | OPENLAYERS
• The resulting OpenLayers View

VIEWS | OPENLAYERS
• Showing the Layers and Graticules window.
• Could be configured in the Behaviors section of every
Map object (see next slide)

VIEWS | OPENLAYERS
• Configuring the Graticules:
>> admin/structure/openlayers/maps/list/clone_of_default/edit

VIEWS | OPENLAYERS
With Luzon Island Group filter

VIEWS | OPENLAYERS
Configure the pop-up behaviour/contents in the
Behaviors section of a map (see next slide).

VIEWS | OPENLAYERS
>> admin/structure/openlayers/maps/list/clone_of_default/edit

VIEWS | OPENLAYERS
You might want to add Photos field in the Tourist Spot
content type (see next slide), then configure the Tourist
Spot Data Overlay View to include this Photos field in
the data fetched and displayed by its View.

VIEWS | OPENLAYERS
Add a Photos field for storing images of the Tourist Spots

VIEWS | OPENLAYERS
The Amanpulo Beach Resort showing its photos.

VIEWS | OPENLAYERS

For a more detailed documentation about OpenLayers-Views
setup, go here.

The docs in the link above is a highly-recommended reading.

SUMMARY

Geofield
Input Widgets
Output Formatters
Default Geofield formats
Leaflet
OpenLayers
Views Integration
Geofield
Leaflet
OpenLayers
http://fc03.deviantart.net/fs71/f/2013/129/8/4/elementary_os_wallpaper_pack_for_windows_by_crossycriss-d5swvpv.jpg

RECOMMENDATIONS
• Use Geolocation, Lat/Lon, or OpenLayers Map as input
widget for Geofield. For stability and flexibility sake,
refrain from using the Leaflet Widget for Geofield.

• Use Leaflet (with integrated Leaflet More Maps) or
OpenLayers as output formatter for Geofield.

• Use Leaflet (integrated Map-Data View) or OpenLayers
(separate Map View and Data View) for showing the
listing of entities containing Geofield data.

REFERENCES
• Drupal Main Site

• Web Mapping with Drupal Slides
• DrupalOverEasy YouTube Channel

WE’RE HIRING!

http://www.ramtracking.com/blog/image.axd?picture=2013%2F8%2FWith+with+us!.jpg

Of Nodes and Maps (Web Mapping with Drupal - Part II)

Of Nodes and Maps (Web Mapping with Drupal - Part II)

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