3. Spatial is Special?
NO! YES!
●
Data are data ●
Maps are the
power
●
The Geographical
Information ●
A map is a complex
Systems are very database but
well defined simple to
understand
Spatial is Indeed Special…but GIS Software Skills will Soon be Obsolete
http://justinholman.com/2012/03/20/spatial-is-indeed-special/
4. The GIS recipe
●
Projections
●
Data models
●
Analysis
●
Rendering
10. 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
13. Data Models
Discrete Data Continuous Data
Vectors with Matrix
attributes Ex.
Points Digital Elevations Models
Lines Solar Power cells
Polygons Orthophotos
GEOREFENCED
29. 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)
30. 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