Intro to GIS Mapping Webinar
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Transcript of Intro to GIS Mapping Webinar
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Intro to GIS Mapping April 23, 2014
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• Why mapping data is effective
– Bill Kennedy, Legal Services of Northern California
• The basics of GIS
– Christina Sanabria, Legal Services Corporation
Agenda
Why GIS, and what is it?
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Agenda
How can mapping help my organization?
Examples of GIS in legal aid organizations:
• Advocacy
– Bill Kennedy, Legal Services of Northern California
• Planning
– Dave Sobie, Legal Aid of North Carolina
• Assessment
– Jonathan Pyle, Philadelphia Legal Assistance
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• Experiment with a few free tools
– Christina Sanabria, Legal Services Corporation
• Join us for a two-part tutorial
– May 14 and 21 trainings on Google Fusion Tables
Agenda
How can I get started?
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Why Mapping?
The Cognitive Science of Mapping and Graphic Presentations of Data
Bill Kennedy,
Legal Services of Northern California
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Spatial Memory and the Brain
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Spatial Memory and the Brain
• Hippocampus is the
center of “spatial
memory.”
• Showing data in a map
gives advocates
opportunity to bypass
other memory centers
(amygdala, entorhinal
cortex).
• “Re-orient” the viewer
and build new memories
using different parts of
the brain.
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Images can be more accessible than numbers
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The same data, now on a map
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It has been done for a long time W.E.B. du Bois’ map of Philadelphia’s Seventh Ward, 1899
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GIS Basics
Christina Sanabria,
Legal Services Corporation
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GIS Map = a Database with Spatial Info
File containing attributes
about geographies
• How much/ many
• What kind
• When
File with your data that can be mapped
File containing spatial data
Resource: http://www.census.gov/cgi-
bin/geo/shapefiles2010/main Joined
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Nodes (points) 2012 LSC grantee
offices
Arcs (lines) NYC subway lines
Polygons (shapes) Percent change in DC
population 2000-2010,
by Ward
Data: Three Geographic Representations
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Nodes (points)
• Input: address converted to latitude and longitude
coordinates
• Ways to use
– Color and/or shape can show type/category
– Proximity can show concentration
– Color and/or size can show magnitude
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• Input:
– Reference pre-existing geographies (e.g. counties)
– Create your own geographies (advanced)
• Ways to use
– Color can show type/category or quantity
– Styling (e.g. cross-hatching) can show type/cat.
Polygons (shapes)
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Layer multiple
datasets to show a
fuller picture
Data Can be Layered
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Mapping in Advocacy
Bill Kennedy,
Legal Services of Northern California
Avondale Glen Elder Neighborhood Association
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Environmental Justice
• In December 2008, staff from Sacramento
Natural Gas Storage Company contacted clients
in a historically African American community two
weeks before Christmas offering $500 cash and
a $200 gasoline credit card for the mineral rights
beneath their homes.
• Their plan was to pump 7.5 billion cubic feet of
natural gas into bedrock beneath the homes.
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Maps in Less Than an Hour
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Advocating against proposed closure of mental health centers
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Potential burden on patients traveling to health centers
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Takeaways
• Maps are processed differently by the brain than
written/spoken material.
• Maps don’t have to be “pretty” or take a long
time to be meaningful.
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Office Location Assessment
Dave Sobie,
Legal Aid of North Carolina
Mapping for Planning
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Do we need an additional legal aid office in this area?
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Why map the data?
• It would help answer a specific question (“Do we
need an additional legal aid office?”)
• We wanted to see spatial relationships within
this area. Where are the concentrated areas of
poverty? For adults? Children? Seniors? Etc.
• Mapping the data may raise additional questions
for further inquiry.
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Poverty in the Focus Area
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Poverty and Clients Served in the Focus Area
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Extreme Poverty (income <50% of FPL) in the Focus Area
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Poverty and Clients in Richmond County
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Poverty and Clients in Richmond County
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Results
• LANC established an office in Rockingham.
• Increased number of clients from this area.
• Local judges got involved and allowed LANC to
do domestic violence work in neighboring
county.
• Reduced travel time for clients.
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Map project advice
• Create more maps than you need.
• Search web for map examples and great ideas.
• Check out local county/city GIS departments
• Avoid trying to put too much information/data
into your maps.
• Create a workflow – it will save you time.
• Experiment!!
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Reaching Asian Populations in Philadelphia
Jonathan Pyle,
Philadelphia Legal Assistance
Mapping for Assessment
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Reaching Populations in Philadelphia
Ratio of intakes to pop. in poverty, by race:
Category: Intakes People Ratio
Black: 5,714 201,633 0.028
White: 1,764 82,912 0.021
Hispanic: 966 74,399 0.013
Asian: 206 25,430 0.008 Sources:
Intakes: Philadelphia Legal Assistance in 2013
Poverty: Census Bureau American Community Survey, 2012 5-year
estimates
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Locations of Asian social service organizations
Chinatown
Social service agencies
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Relatively large number of households
Relatively small number of households
Social service agencies
Number of linguistically isolated households (Asian languages)
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Relatively large number of households
Relatively small number of households
Social service agencies
Number of intakes
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Social service agencies
Relatively large ratio
Relatively small ratio
Chinatown
Ratio of intakes to linguistically isolated households
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Relatively large ratio
Relatively small ratio
Drilling down: studying potential outreach targets
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Relatively large ratio
Relatively small ratio
Drilling down: studying potential outreach targets
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Potential outreach partners
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Suggested Resources
• U.S. Census Bureau American FactFinder web
application:
– http://factfinder2.census.gov
• LegalStat web application (PLA’s TIG project):
– http://legalstat.philalegal.org
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A Few Free Mapping Tools
• Google Fusion Tables
• Google Maps Engine Lite
• Tableau Public
• QGIS
• ArcGIS (reduced price through TechSoup)
See LRI for more information about each of these tools.
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Thanks for Joining Us
• Join us for parts two and three of the series
– May 14, 1 PM ET
– May 21, 1 PM ET
• Contact us for additional information
– Brian Rowe, [email protected]
– Christina Sanabria, [email protected]
– Dave Sobie, [email protected]
– Jonathan Pyle, [email protected]