Embed Size (px)
DESCRIPTION
Talk on Web 2.0 mapping technologies plus comparison with GIS technology. The link at the end goes to a Google Earth demonstration found on my blog. http://gisatvassar.blogspot.com/2007/10/google-earth-lunchtime-demonstration.html
Citation preview
And other virtual globes
2
3
Web maps and data visualization
Many Many EyesEyes
GapmindGapmindererWorld World
Freedom Freedom AtlasAtlas
WorldmappWorldmapperer
4
Virtual globes
CelestiaCelestiaWorld WindWorld Wind
ArcGIS ArcGIS ExplorExplorerer
Google Earth for Environmental Managers
5
• Making place marks (points, line, polygons)
• Image overlays• Easy to share files (KML or KMZ)• Easy to use• Cross-platform• No overhead (it’s free!)
What is a GIS?
6
An organised collection of
• computer hardware, • software, • geographic data, • procedures and • personnel
Designed to efficiently capture, store, update, manipulate, analyze, and display all
forms of geographically referenced information.
Google Earth is NOT…
7
… a true GIS because it cannot…querybufferclipdo quantitative analysisdo cartography
≠≠
Spatial accuracy and precision
8
From OgleEarth blogger: There is no stated accuracy, and accuracy varies. …
Of course, Google Earth is free, and good enough for most uses, and especially in the US and Europe the accuracy is high and errors negligible (< 4m)…
From a Google Earth contact: Check out this Wikipedia page:
http://en.wikipedia.org/wiki/Google_Earth#Resolution_and_accuracy
9
Scientific use of Google Earth
10
Do you still need your GIS skills?
11
Spatial accuracyPrecisionMetadataAnalyses across multiple layersCartography
Absolutely
Google Earth demonstration
12
gisatvassar.blogspot.com
