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An Introduction to GIS for developers Part 1: Introduction and GIS Fundamentals
Canserina Kurnia & Tom Shippee
Why are you here…? • This session should answer…
- What makes GIS different? - Why should I care? - What’s important for developers to know?
• Help you to realize a GIS “Aha! Moment…”
Session format • Four 90-minute sessions
- 80 minutes of presentation & demo - 10 minutes of Q & A
• Breaks - 30 minutes morning and afternoon - 60 minutes for LUNCH
Session schedule 8:30 Introduction & GIS Fundamentals
10:00 Break
10:30 GIS Data (finding, managing & updating) 12:00 Lunch
1:00 GIS Functionality (visualization & analysis) 2:30 Break
3:00 GIS Sharing (publication and clients) 4:30 Wrap-up
GIS: The power of location…
Dr. John Snow 1854 London Cholera outbreak
Enables informed decision making...
How do we cleanup the Gulf oil spill?
Where should we eat?
Empowering Informed decision making…
Data
Information
Knowledge
Understanding
Mapping/Analysis
Integration
Sharing and
Collaboration
ArcGIS a complete platform
Content Mgmt ArcGIS Online/Portal
GIS Services ArcGIS Server
Apps and applications
Back office infrastructure
Content and services
“discover, use, make & share”
GIS Content & Analysis ArcGIS Desktop
Getting the information out… Provides Geospatial Capabilities Across the Entire Organization
. . . A Framework For Sharing, and Collaboration
• Mapping
• Analysis
• Visualization
Citizens Managers
Knowledge Workers
Professional GIS
Enterprise Integration
Deployed Users
Getting the information in… Breaks down barriers to communication & collaboration
. . . Anyone can gain access to the information they need
Exploring GIS as a Platform
Fundamentals
Data
Functionality Sharing
Exploring GIS as a Platform
Data
Functionality Sharing
Fundamentals
Big Bear Lake, California
Bald Eagle Counting
Solving a GIS problem…
Alex
Gina
Beth
Rick
ArcGIS Online Organization
Beth Organization Properties
Featured Content
ArcGIS Desktop
Web clients Browser access
Esri Maps for Office MS Excel
Gina
ArcGIS Server
Case study: Bald Eagle counting
What location adds to data
Understanding GIS
What is GIS? • Geographic Information Systems
- What is “geographic information”?
- What are “systems”?
People Data Hardware Software Workflows
What can you do with GIS? • Measuring size, shape and quantity
- Example: Number of people over age 64 in southwestern U.S.
What can you do with GIS? • Find the best locations and paths
- Example: Parcels inside flood zone
What can you do with GIS? • Find what’s nearby
- Example: Shipwrecks within a half mile of coral reefs
What can you do with GIS? • Detecting change and qualifying patterns
- Example: Mount Saint Helens before and after the 1980 eruption
Geometry provides location
GIS data models
GIS data models
Real world Vector Raster
Vector features • Real-world entities represented as shapes on maps
Connecting vector shapes to real places
• Point: A pair of x,y coordinates
• Line: A series of x,y coordinate pairs
• Polygon: A closed shape defined by connected x,y coordinate pairs
x,y
x,y
x,y x,y
x,y x,y
x,y
x,y
Raster data: A cell-based view • Good for continuous phenomena
Elevation
Aerial photo
Soil type
Raster data structure • Each cell stores a single value, measure, count, etc.
OID Shape Num Name Address City
1 Polygon E7932853 Tom Jones 12354 Elm St Redlands
2 Polygon N9802542 Ellen Dolan 1370 Oak St Riverside
3 Polygon Q9037857 Susan Quinn 92145 5th Ave Highland
Turning geographic information into GIS data
Attribute data
Spatial data
Reality
Layers, symbology & labels
GIS Map basics
A layer-based view of the world
Streets
Land use
Administrative areas
Hydrography
Elevation
Imagery
Layers and data
South_America Cities Countries Rivers
Controlling visibility of features
Alaska Earthquakes
Alaska Earthquakes
Magnitude > 7
Symbology based on attributes Category: State Name Quantity: Population
Scale dictates feature geometry
city
1:500 1:24000
Large scale More detail
1:250000 1:24000
Small scale Less detail
city
0 1000 2000 3000 4000 Kilometers
Map text: Labels • Software-generated map text based on attribute values
Map text: Annotation • User-generated map text • Placement controlled by user • Can be generated from labels
Measuring & mapping the earth
What are coordinate systems?
Where is this place?
Who knows?
A
• Relative location versus absolute location
What is location?
East of Los Angeles
380 New York Street Redlands, CA
Southern California
In the Inland Empire
FIPS 06
Off Interstate Hwy 10
-117.195646, 34.056397
117 11' 44.32“, 34 3' 23.02"
92373
UTM Zone 11 45 minutes west of Palm Springs
Two types of coordinate systems • Geographic coordinate systems (GCS) • Projected coordinate systems (PCS)
Spherical model (GCS) Latitude/Longitude
Flat model (PCS)
Where to get the coordinate system information? • For map and feature services:
- WKID - Resource center - Services Directory
Combining map layers: Spatial reference
<esri:SpatialReference wkid="102100"/>
Spatial Reference: 54030 Single Fused Map Cache: false Name: World Robinson projected coordinate system
Spatial Reference: 102100 Single Fused Map Cache: true Name: Web Mercator (Auxiliary Sphere) projected coordinate system
+
Q & A Thank you for attending…
Canserina Kurnia ([email protected]) Thomas Shippee ([email protected])
Online Survey: http://www.esri.com/events/devsummit/session-rater
