open geo data - technical issue
DESCRIPTION
short introduction to open geo data.Technical issues and overview to the openstreetmap potentialityTRANSCRIPT
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Spatial is Special?
NO!● Data are data● The Geographical
Information Systems are very well defined
YES!● Maps are the
power● A map is a complex
database but simple to understand
http://justinholman.com/2012/03/20/spatial-is-indeed-special/Spatial is Indeed Special…but GIS Software Skills will Soon be Obsolete
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The GIS recipe
● Projections● Data models● Analysis● Rendering
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Ex. Cilindric projection
(X,Y)
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Datum
http://www.gisetelerilevamento.com/2010/04/superfici-di-riferimento-e-coordinate/
Ex.World Geodetic System 84
geoid
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Universal Traverse Mercator
source: USGS
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UTM Zone
http://upload.wikimedia.org/wikipedia/commons/e/ed/Utm-zones.jpg
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The most used in web devel.● EPSG:4326 - WGS84
– Degree (lat/long)– WGS84
● EPSG:900913 – Google Mercator– Meters – WGS84– World without polos
● Digit version of the word GOOGLE
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Resources
http://spatialreference.org
● 4362 EPSG references
● 447 ESRI references
● 2380 IAU2000 references
http://trac.osgeo.org/proj/
Cartographic Projections library
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Data Models
Discrete Data
Vectors with attributesPoints
Lines
Polygons
Continuous Data
MatrixEx.
Digital Elevations Models
Solar Power cells
Orthophotos
GEOREFENCED
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DTM gray
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DTM elevation
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Example Vector
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Points
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Lines
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Overlay
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Query
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Network Analysis
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Graphs
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Solar radiation
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Precipitation
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Nice … but Open Data?
Yes!Licenses & Formats & Protocols
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Our friends
Only if he speaks also about open data
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Open Formats● Vectors
– ESRI Shapefile– GML– GeoJSON– KML
● Raster– Ascii Grid– GeoTiff–
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Eg. ESRI Shape
● Standard de facto● 3 (4) files with the same name and
different extension
filename.shp → geometry
filename.shx → index
filename.dbf → table
(filename.prj → projection)
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Geo Web Services● WMS
– Web Map Service
● WFS
– Web Feature Service
● WCS
– Web Coverage Service
● WPS
– Web Processing Service
● TMS
– Tile Map Service
● CSW
– Catalog Service for the Web
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TMS
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Clients
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Where are the data?
http://earthexplorer.usgs.gov/http://publicdata.eu
… and more more ...
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OpenStreetMapOpen Community Data
~ … but for the maps ...born in 2004
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HOW?
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People and vehicles of OpenStreetMap(slide by Niccolo Rigacci – http://www.rigacci.org - CC-BY-SA-NC)
WHO
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Tools
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http://wiki.openstreetmap.org/wiki/Map_Features
Geometries and attributes
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Collect the data
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Trace the data
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with the walking papers
http://walkingpapers.org/print.php?id=d6rzwc3d
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Improve the data collected
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http://www.openstreetmap.org/?lat=44.493944&lon=11.343526&zoom=18&layers=A
Official
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http://wiki.openstreetmap.org/wiki/List_of_OSM_based_Services
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Tappa “Herning-Herning” – http://www.gazzetta.it/Speciali/Giroditalia/2012/it/tappa.shtml?t=01&lang=it
Giro d'Italia(1/2)
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Giro d'Italia (2/2)
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Maurizio [email protected]
Blog:http://de.straba.us
Twitternapo
Slideshttp://www.slideshare.net/napo
Thanks!!!