welcome to mapping tom sellsted – city of yakima, washington vladimir strinski – hitech systems
TRANSCRIPT
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Welcome to Mapping
Tom Sellsted – City of Yakima, WashingtonVladimir Strinski – Hitech Systems
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Objectives
What is GIS? Why do we use GIS? Terminology Creating your own layers MapInfo / ESRI specific tools
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What is GIS?
Geography is information about the earth's surface and the objects found on it, as well as a framework for organizing knowledge. GIS is a technology that manages, analyzes, and disseminates geographic knowledge.
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Three Views of a GIS- A Database View
A GIS is a unique kind of database of the world a geographic database (geodatabase). It is an "Information System for Geography." Fundamentally, a GIS is based on a structured database that describes the world in geographic terms.
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Three Views of a GIS- A Map View
A GIS is a set of intelligent maps and other views that show features and feature relationships on the earth's surface. Maps of the underlying geographic information can be constructed and used as "windows into the database" to support queries, analysis, and editing of the information. This is called geovisualization.
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Three Views of GIS- A Model View• A GIS is a set of
information transformation tools that derive new geographic datasets from existing datasets. These geoprocessing functions take information from existing datasets, apply analytic functions, and write results into new derived datasets
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Geographic Information Systems
A method to visualize, manipulate, analyze and display spatial data
“Smart Maps” that link databases to a map
How many, what kinds, where are they?
Combine data from many different sources
80% of all data has some spatial component
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Database “Not Easy to Interpret”
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Visualization “Worth a Thousand Words”
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Two Ways to Input and Visualize Data
Raster – Grid• “pixels”• A location and value• Satellite image and aerial photos are in this format
Vector – Linear• Points, Lines & Polygons• “Features” (house,lake, etc)
• Attributes• size, type, length, etc.
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Welcome to MappingTerminology
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Types of Features
Vector Features– Points– Lines– Polygons
Raster Features– Elevation Models– Imagery
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Point Features
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Line Features
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Polygon Features
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Raster Features
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Composite Layers
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Layer Table
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Layer Table Geometry
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Layer Table Geometry
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Map Projection
What is projection? Why do we need it? On the fly projection
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What is Map Projection?
A projection is a mathematical means of transferring information from the Earth's three-dimensional, curved surface to a two-dimensional medium—paper or a computer screen.
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Why use Map Projection? Map layers come from different sources
An elevation image classified from a satellite image of Minnesota exists in a different scale and projection than the lines on the digital file of the State and Providence boundaries.
The elevation image has been reprojected to match the projection and scale of the State and Providence boundaries.
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On the Fly Projection
Reprojects features automatically Imagery won’t reproject on the fly Great for AVL applications
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Creating a Sample MapUsing ESRI Products
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Starting ArcMap
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Setting Layers/Data Frame Properties
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Set appropriate projection
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Adding Layers
Add Data
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Adding Layers Dialog
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Display photos
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Add Streets
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Configure Streets
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Display Streets
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With other Layers added
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Create Map Layout
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Show Map Layout
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Add Map Elements
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Complex Composition
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For More Information:Tom E SellstedCity of Yakima, [email protected]://www.ci.yakima.wa.us/gis
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Sources of Data
All departments contribute One central repository Ease of sharing Ease of maintenance Other agencies Vendors