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Finding Geospatial Data
A closer look at several useful sources of free geospatial data
René Duplain ([email protected]), Data Analyst, GSGPierre Leblanc ([email protected]), Cartographic and GIS Support Specialist, GSG
Introductions
Workshop outline
● Intro to geospatial data● Explore various data portalso Scholars GeoPortal Hands-on Tutorialo Geogratis Videoo Open Data Ottawao GSG Libguideo Other sources● Mapping geospatial data with sample datasets● Complete evaluation form
Intro to geospatial data
Common questions:●What is geospatial data?●What are the most useful sources of free geospatial data available?●How do I navigate these portals?●What is metadata and why is it important? ●Where do I start my data search for my next project?
Geospatial data can take many forms...
Excel table
Shapefile
DBF
JPG
BMP
Google Earth KML
AutoCAD
File Geodatabase
MicroStation Design
DEMERDAS
IMAGINE
Adobe Geospatial
GEORSS
Esri Grid
TIFF
GIF
SRTM
XML
… and more!
Geospatial Data
Our definition
● “Geospatial data identifies and describes the geographic location of features and boundaries. Spatial data is usually stored as coordinates and topology and can be mapped. There are two types of geospatial data: vector and raster.”
- https://biblio.uottawa.ca/en/find/geospatial-data-and-maps
Vector data
http://researchguides.library.yorku.ca/content.php?pid=245987&sid=2176375
http://webhelp.esri.com/arcgisserver/9.3/java/geodatabases/feat_c-1166806282.gif
Raster data
http://researchguides.library.yorku.ca/content.php?pid=245987&sid=2176375
http://researchguides.library.yorku.ca/content.php?pid=245987&sid=2176375
http://researchguides.library.yorku.ca/content.php?pid=245987&sid=2176375
http://docs.qgis.org/2.2/en/_images/raster_dataset.png
“Layering” data
http://www.tualatinoregon.gov/maps/other-gis-resources
Scholars GeoPortal - Tutorial
Geogratis
http://geogratis.cgdi.gc.ca/geogratis/Home?lang=en
Open Data Ottawa
http://ottawa.ca/en/mobile-apps-and-open-data/open-data-ottawa
GSG Website
http://biblio.uottawa.ca/en/gsg-centre
Other useful sites
● geoOttawao http://maps.ottawa.ca/geoottawa/
● Open Datao http://open.canada.ca/en/maps/open-data-canada
● USGS Earth Explorero http://earthexplorer.usgs.gov/
● Natural Earth Datao http://www.naturalearthdata.com/downloads/
● OpenStreetMapo http://wiki.openstreetmap.org/wiki/Downloading_data
● SEDACo http://sedac.ciesin.columbia.edu/
Mapping geospatial data
● Download data: http://gsg.uottawa.ca/geo/workshops/finding_geospatial_data/
Questions?
• Please complete evaluation form