This work is licensed under the Creative Commons Attribution-Noncommercial-Share Alike 3.0 United States License. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-sa/3.0/us/ Geospatial Web Dr. Harry Chen CMSC 491S/691S March 24, 2008
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This work is licensed under the Creative Commons Attribution-Noncommercial-Share Alike 3.0 United States License. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-sa/3.0/us/
Geospatial Web
Dr. Harry Chen
CMSC 491S/691S
March 24, 2008
Agenda
Digital maps revolutionIntroduction to GISKey Geospatial Web technologies
Our civilizations are built on maps
Anglo-Saxon world map (circa 1040 CE)
1883 reconstruction of Eratosthenes' map(276-194 BC)
Babylonian World map
(6th Century BC)
Tabula Peutingeriana (4th century)- Britain to the west, India to the East
Map by itself is a technology Gives a virtual representation of an area Tells a story about of our past history Highlights the symbolic relationships between
entities, objects and regions
Cartography – the study of map-making
World Map 1970
Source: National Geographic
Ukraine is part of the USSR
World Map 1994
Source: National Geographic
Ukrain is no longer part of the USSR
Digital Maps
Picture a digital map in your head.
What do you see?
Do you see this?
Fine. Google Maps is the most popular digital map today. But, there are many other kinds of digital maps before it. Without their innovations, we won’t have Google Maps.
Introduction to GIS
Disclaimer
This is not a geography course lecture. This is not a cartography course lecture.This lecture is not intended to cover the
full history or evolution of digital map making.
It’s intended for software developers who want to learn geospatial web programming
Key concepts
GIS (Geographic Information Systems)Geospatial Web
GIS (Geographic Information Systems)
No standard definition of what it isIn general, it’s the use of computer
systems to manage, analyze and display geographical information
We use GIS to solve problems e.g., resource management and planning
Geospatial Web
No standard definition of what it isGIS for the Web: Use GIS technology to
enhance Web application functions The Web for GIS: Use the Web as a
platform for sharing geographic data, enabling collaboration and enriching the capabilities of GIS.
Emergence of GIS
Computing technology advancements helped to establish the GIS foundation
Kind of like Paper Maps Digital Maps Pen drawing Click icons Statistical data on paper Saved data in DB