1 CIS 454-01 / 528-01 Introduction to Business GIS Winter 2005 Lecture 2 Dr. David Gadish.
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1 CIS 454-01 / 528-01 Introduction to Business GIS Winter 2005 Lecture 2 Dr. David Gadish
2 Lecture 1 Review Course outline Course web site Student introduction Introduction to GIS The project
3 Lecture 2 Agenda What is GIS? (Review) Start Foundations of GIS –Focus on GIS data Demo: City of LA Prototype Hands-on exercises: –Chapter 3 – Exploring ArcMap –Chapter 4 – Exploring ArcCatalog (time permitting) Your project
5 What is GIS ? G eographic I nformation S ystems –G IS –Managing geographic space using information technology Spatial Information Systems (SIS) –A better term? –Not widely used Location-based Services (LBS) –Getting more and more popular –Focus on “services”
6 Benefits of GIS to an Organization Decreased costs Increased efficiencies Increased customer satisfaction Increased profits
13 GIS Data - Layers GIS map vs. Paper map GIS map contains layers: collections of geographic objects that are alike –See image on P-2 A layer may contain features or a surface –A layer that is a surface: “Oceans” in image on P-2 –A layer of features: cities, rivers…
19 GIS Data - Surfaces A layer may contain a surface Also known as raster layer This is an array (grid) of measured values for various locations on the earth’s surface See 3 images at the bottom of P-3 Each grid cell represents a unit of surface area –E.g. 5meters X 5meters
21 GIS Data – Feature Location Features have locations on earth GIS uses a grid to place a feature in the appropriate location on the map A coordinate system is a grid that has an origin (0,0) location Locations are specified as (x,y) values at an x horizontal distance, and y vertical distance from the origin location –See figure on P-4
23 GIS Data – Scale of Displayed Features Can zoom in to see features at a closer range. The zoom action changes the scale of the map Scale: the relationship between the size of features on the map, and the size of the corresponding places in the real world 1:1,000,000 means features on map are one million times smaller than their true size –See figure on P-5
25 GIS Data – Feature’s Attributes Information about features in a layer are stored in a table –The table has a record (row) for each feature in the layer –The table has a field (column) for each category of information – these categories are called attributes –The table is known as the attribute table of a layer (see image on bottom of P-6)
27 GIS Data – Spatial Relations Features have spatial relations Can ask questions about features, but also can ask questions about relations between features: –E.g. which roads cross Main St. ? –Which state’s capital city is closest to LA ?
29 Common Feature Data Layers Road centerline layer Zip code polygon layer Control layer Survey layer Property boundaries (cadastral) layer Building outline layer Others? Business related layers?
30 Common Surface Data Layers Temperatures layer Elevations layer Terrain layer Others?
31 More Foundations of GIS Next week we will look at the remaining issues: –Hardware –Software –Workflows –Science
35 Chapter 3 – Exploring ArcMap ArcMap: map display, analysis and some editing. Introduction to the interface of ArcMap (P- 15) –Main menu –Toolbars –Table of content (on left) –Map Display (on right)
36 Chapter 3 – Exploring ArcMap Objectives: –3a: Display map data –3b: Navigate a map –3c: Looking at feature attributes
37 3a: Display Map Data Start ArcMap Open an existing map file:.mxd Turn display of layers on/off Zoom in / Zoom out Pan Identify features View full extent
38 3b: Navigate a Map Create / use bookmarks for navigation Measure distances
39 3c: Looking at Feature Attributes Open an attribute table corresponding to a later: –A feature on the map corresponds to an attribute in the attribute table –Select an attribute corresponding feature selected (P-42)
42 Your Project – Key Objectives Apply the knowledge you gain in this course to a real-world organization. Show how using the GIS technology you learn in this course improves a particular organization. Select a company (or sector), research, determine and document the extent of its current use of GIS technology. Propose new, GIS-related, ideas which will further enhance the organization (organization).
43 Your Project Graduate students expected to explore their topics to a substantially greater depth then undergraduate students. Individually meet with each student to define topic and scope. Project proposal due just before class in 2 weeks. 5% of your final course grade. Refer to the “Project Requirements” doc.
44 Your Turn: Hands-on Project meeting with students while you do the hands-on exercises in the book.
48 Next Week’s Agenda Continue: Foundations of GIS –(Data), Hardware, Software, Workflows, Science A survey of the GIS industry (time permitting) Hands-on exercises: –Chapter 8 – Querying Data (8a and 8b only) –Chapter 9 – Joining and Relating Tables (time permitting)