Post on 21-Dec-2015
transcript
Today’s Objectives
explore a map and get information about map features
preview geographic data and metadata add data to a map describe the structure of a map explain how a GIS represents real-world objects change the way features are drawn on a map access feature information in different ways describe spatial relationships of map features describe how GIS can be used to solve problems
Spatial Relationships 1
Distance
Which countries contain a lake completely within their borders?Which cities are located within 25 kilometers of a river?
GIS as a Process 1
1. Capture data
2. Store data
3. Query data
4. Analyze data
5. Display data
6. Present data
1. Ask a geographic question2. Acquire geographic data3. Explore geographic data4. Analyze geographic information5. Act on geographic knowledge
GIS as a Process 2
Summary A GIS organizes and stores information about the
world as a collection of thematic layers. Each layer contains features with the same shape and attributes, all located within a common geographic area.
Each feature is assigned a unique numerical identifier and is characterized by a unique location in space and a corresponding record in a table.
Features can be stored in a GIS as three primary shapes: points, lines, or polygons.
Features have spatial relationships with other features, and with a GIS you can find features based on their spatial relationships.
The geographic inquiry process provides a framework for solving problems with GIS.