MapBox Satellite
Phase 1, Launched 12/2012
• Global imagery base layer for MapBox
users
• Global satellite imagery, zoom 0-12
• Continental U.S. aerial imagery zoom
13-17
• Licensed to allow for OSM tracing
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MapBox Satellite phase 1
was sourced entirely from
public domain, open data.
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Kuala Lumpur, Malaysia
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Los Angeles, CA -
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Brawley, CA
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Cloudless Atlas
• Cloudfree global mosaic, zoom 0-8
• NASA MODIS Aqua and Terra Satellites
• 380,000 source satellite images
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Open data
is good.
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“data is open if
anyone is free to
use, reuse, and
redistribute it ...”
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“subject to the
requirement to
attribute and/or
share-alike”
-Open Knowledge Definition
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ACCESS
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- open license
- open format
- available for download
ACCESS
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assumptions
3+1
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There are different
types of open data
users.
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Different users have
different needs and
abilities.
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Data accessibility
matters.
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Open data is not
truly open if it is
inaccessible.
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USERS
3
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CASUAL
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casual
•least technical
•dataset discovery
•basic needs: ability to
query and download
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•geoportal
•simple html table
•solid metadata
•intuitive interface
casual
bulk
• Need entire datasets, not spatial
intersections
• Data APIs/manual retrieval
workflows do not scale
• Sometimes retrieve data via
physical drives
New Hampshire Statewide GIS Clearinghouse
http://www.granit.unh.edu/
Bulk
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API
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TYPES
3
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CONTENT
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ConTeNt
Database
REST
Content
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Content
• Makes application content available
for developers to integrate into
existing/new applications
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Content
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DATA
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Database
REST
Matching Rows
Data
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DATA
• Allows users to query large datasets
without having to have full dataset
locally
• Applications can be built on top of
Live/real-time datasets
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Data
http://api.occupy-data.org/v1/?
results&value=crossst&value=age&value=race&value=crimsusp&value=sex&value=build&value=frisked&results_p
er_page=100
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BULK
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Bulk
Database
REST
References
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bulk
• Key difference is user obtains
reference to object requested,
rather than object itself.
• Download object(s) later
• Can be relatively lightweight
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SO?
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Data API =
Best Open
Data MetHOD?
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NO.
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APIs, like geoportals, are not
always the best option for
disseminating open data.
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Different
USers
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Different
NEEds
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Different
Abilities
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Different
Access
Endpoints
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STUFF breaks
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Permalinks
!=
Permanent
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WayBackMachine http://archive.org/web/web.php
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So?
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Open data users
change as tech
changes.
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Access should be
a policy and tech
consideration.
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NEXT
STEPS
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Strive to be
SAD
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SCALABLE
Accessible
Durable
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- Open systems for access to open
data
- Can grow in response to changes
in technology/user requirements
SCALABLE
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- Data access and retrieval is as
quick and painless as possible
- Options for users with different
abilities, different desired results
Accessible
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- APIs, geoportals don’t always work
- Low-maintenance, durable options
- FTP-like directory access
- Good documentation
DURABLE