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Making Nocturnal Light Data More Accessible - FOSS4G2013

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Qing Liu

on 1 November 2013

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Transcript of Making Nocturnal Light Data More Accessible - FOSS4G2013

한식의 단계추가
연계성
마무리
Nighttime light measures...
Observation of
artificial lighting at night
Human Activity
Settlements
Shipping fleets
gas flaring
Correlation between night lights and ...
Light Intensity
Population density
GDP
Energy Consumption
CO2 Emission
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Urban Sprawl
Economists have begun making more use of night lights data
Measuring economic growth
Economic Growth
Korean peninsula
Asian financial crisis:
Java, Indonesia
Discovery of sapphire and ruby deposits in Madagascar
Henderson, J. V., A. Storeygard and D. Weil (2012) “Measuring Growth from Outer Space”,
American Economic Review, 102(2), pp.994-1028.
However...
Matt Lowe, MIT PhD Economics

"the frustration I found when searching for help using the lights data"
Night Lights and ArcGIS: A Brief Guide
http://economics.mit.edu/files/8945
My own experience
with large raster dataset
Erdas Imagine, ENVI, IDRISI, ArcGIS
What's in common?
(LOL)
Commercial software
Processing time (if not crash)
Individual raster file storage
Raster-vector analysis
Lack of sophisticated statistical tools (for pixel-based analysis)
PostGIS Raster
in the context of
desktop GIS analysis
Commercial software

Processing time (if not crash)

Individual raster file storage

Raster-vector analysis

Lack of sophisticated statistical tools (for pixel-based analysis)
FOSS4G :D
Very fast for small coverage, scalable for global
DB environment
seamless vector-raster integration
write you own stat(), easy export
How to store
O
Lat, Long, Val, geom
,(time?)
DMSP-OLS 30arc second
~1km at the equator
What's cool about it
Potentials in and beyond the desktop GIS analysis context
As an data source
Export as
accessible
CSV: for pixel-based statistical analysis
correlation
scatter plot matrix
regression
ASCII:
be imported into other software
Publish as
Geographic Features
interactive
query
analysis

Tile Maps
Data API
Feeding other applications
GeoJSON
WKT
KML
etc
it's easier said than done ...
API render
Leaflet (cluster)
CartoDB
Server Map Services
GeoServer
WFS, WMS
Tilemill
MapBox
Quadkey reference
Google Maps API
mapping global data?
We are exploring ...
I'm here to learn ^_^
Data Consideration
Gas Flare
Gas flare mask
Economists won't want to count gas flaring as GDP
Zero Population
Well lit at night, without people living there
Airport, Parking lots, etc.
Future Directions
Time series nighttime light data
A collection of global datasets
1km population density raster
0.1 degree NDVI raster (Normalized Difference Vegetation Inex)
Register different datasets (at same or close resolution) to the same world grid
Making
Nocturnal Light Data

More Accessible
a FOSS solution
Qing Liu
University of Denver
FOSS4G 2013

Qing.Liu@du.edu
Full transcript