Intro to ArcGIS Kate Dougherty, Geosciences & Maps
Librarian Tutorial created for version 10.1 in February 2013
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Overview What is GIS? Common uses Software Interface &
navigation Adding layers Customizing & displaying layers Select
features by attribute Select features by location Buffer features
tool Layout view Datums & projections File management Data
sources
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What is GIS? Geographic Information Systems (GIS) is a
computer-based methodology for collecting, managing, analyzing,
modeling, and presenting geographic or spatial data. Allows you to
overlay datasets and query them in terms of their spatial relation
to each other
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Two Types of Spatial Data Raster - continuous data E.G., air
photos, scanned maps, elevation layers Most remote sensing data is
raster data Vector - discrete features A layer comprised of
individual points, lines or polygons (e.g., roads or states) This
presentation focuses on vector data
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Common Uses Analyzing potential environmental hazards Emergency
services planning and routing Siting new facilities: wind farms
power plants vineyards Identifying food deserts in urban areas Much
more!
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Esri Environmental Systems Research Institute ESRI is now Esri
Industry leader for GIS software Program is ArcGIS/ArcMap Now up to
version 10.1. (This presentation done with V. 10)
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Table of contents that shows the docs layers. The data frame
that displays the spatial data.
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Go to full map extent Go to previous extent Go to next extent
Select features (by hand) Clear selected features Select elements
(to move or edit) Identify feature Add data
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Project: Identify Washington County Parcels Near Perennial
Streams
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Add Layers States (Census Bureau) Counties (Census Bureau)
Hydrography (Area - National Hydrography Dataset) Hydrography (Area
- National Hydrography Dataset) Parcels (Washington County
Wash_Co_Data_Month_Year.zip) Parcels (Washington County
Wash_Co_Data_Month_Year.zip) Public lands (GeoStor)
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Click to add data
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Coordinate Systems All your layers may not necessarily use the
same coordinate system. OK to draw and display Not OK for detailed
analysis (need to reproject layers advanced step)reproject layers
Data frame will use the coordinate system of the first layer thats
added (displays feet, meters, or decimal degrees/lat/long of cursor
location in bottom-right corner, depending on coordinate
system)
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View With All Layers Added
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Zoomed to Washington County
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State layer renamed Rename States Layer
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Open the Attribute Table
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Customizing Layers Select by Attribute Tool
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Selection is Highlighted
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New Layer is Added to Map
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Arkansas Only Remaining State
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Changing the Display of Layers Change symbology/colors Turn
individual layers on or off Change the display order Layers on map
display according to their order in the table of contents Top
layers may hide features in layers under them Click & drag a
layer in the table of contents to change its display order on the
map
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Change the Display Order
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Change Symbology of Layers
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Change Color of Streams
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New Symbologies Displayed
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Clip Streams to Washington County Clip Tool
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Access Clip in Geoprocessing Menu
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Clip Tool Dialog Box
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Clip Tool Progress Indicator
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Clip Completed Indicator
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Change Symbology of New Clipped Hydro Layer
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New Clipped File Looks Great!
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Analysis We will find parcels that: Contain perennial streams
And note their status in the parcel layers attribute table.
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Add New Columns to Attribute Table
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Field Types Whole Numbers Short Integer (integers from -32,768
to 32,767) Long Integer (integers from - 2,147,483,648 to
2,147,483,647) Decimals Double (up to 6 decimal places) Float
(unlimited # of decimal places)
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Task: Select Parcels with a Perennial Stream
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View Selected in Attribute Table
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View Selected Records Only
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Task: Select Parcels in a flood Zone Within a Distance of
Perennial Streams Use the buffer tool to draw a buffer zone around
specified features
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Manage Files with ArcCatalog File manager for files used in
ArcMap Best to manage moving pieces this way, instead of Windows
Explorer
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ArcCatalog Window
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Use ArcCatalog to View Metadata
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Share Maps and Layers with Packages Package up all the
information used to create a layer or map document for easy sharing
by email, a shared drive on the LAN, etc. Right-click a layer in
the TOC and select Create Layer Package
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Share a Map Package To package up an entire map document for
sharing, use File | Create Map Package
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ArcMap will force you to create some limited metadata before
creating a sharable package. Click OK.
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Creating Packages Save the package as a file and share as you
usually would You must validate your package before saving Detects
any errors that would impede sharing
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Validation Any errors need to be corrected. Click on any error
messages to see a help document. Warnings are warnings only can go
ahead and publish. If no problems, the share button will become
active.
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What Else Can You Do with GIS? Join stats based on geography
(i.e., states) to a states GIS layer and view the data spatially
Excel, CSV, text formats Create/digitize your own data import GPS
data Analyze viewsheds and shadows Use web map services for mashups
in your own applications Much more!
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GIS Software at University of Arkansas Reference desk machine
(version 10.1) Campus-wide license administered by the Center for
Advanced Spatial Technologies (CAST) Free software
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Sources of GIS Data Search for selected base layers (reference
maps) from right within the application GeoStor (Arkansas state
portal) GeoStor geo.data.gov (federal portal) geo.data.gov National
Map (USGS) TIGER/Census Shapefiles (reference layers boundaries,
roads) TIGER/Census Shapefiles
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LibGuide The Maps, GIS and Remote Sensing LibGuide can point
you to:Maps, GIS and Remote Sensing LibGuide Information on how to
get Esri software through the campus license Resources for learning
GIS Sources of GIS data (spatial and attribute)