Intro to ArcGIS Kate Dougherty, Geosciences & Maps Librarian Tutorial created for version 10.1 in February 2013 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 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 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 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! 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) Table of contents that shows the doc’s layers. The “data frame” that displays the spatial data. Go to full map extent Go to previous extent Go to next extent Identify feature Select features (by hand) Select elements (to move or edit) Clear selected features Add data Project: Identify Washington County Parcels Near Perennial Streams Add Layers • States (Census Bureau) • Counties (Census Bureau) • Hydrography (Area - National Hydrography Dataset) • Parcels (Washington County – Wash_Co_Data_Month_Year.zip) • Public lands (GeoStor) Click to add data 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) • Data frame will use the coordinate system of the first layer that’s added – (displays feet, meters, or decimal degrees/lat/long of cursor location in bottom-right corner, depending on coordinate system) View With All Layers Added Zoomed to Washington County Rename States Layer State layer renamed Open the Attribute Table Customizing Layers Select by Attribute Tool Selection is Highlighted New Layer is Added to Map Arkansas Only Remaining State 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 Change the Display Order Change Symbology of Layers Change Color of Streams New Symbologies Displayed Clip Streams to Washington County Clip Tool Access Clip in Geoprocessing Menu Clip Tool Dialog Box Clip Tool Progress Indicator Clip Completed Indicator Change Symbology of New Clipped Hydro Layer New Clipped File Looks Great! Analysis • We will find parcels that: – Contain perennial streams And note their status in the parcel layer’s attribute table. Add New Columns to Attribute Table Field Types Whole Numbers Decimals • Short Integer (integers from -32,768 to 32,767) • Double (up to 6 decimal places) • Long Integer (integers from 2,147,483,648 to 2,147,483,647) • Float (unlimited # of decimal places) Task: Select Parcels with a Perennial Stream View Selected in Attribute Table View Selected Records Only 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 Manage Files with ArcCatalog • File manager for files used in ArcMap • Best to manage moving pieces this way, instead of Windows Explorer ArcCatalog Window Use ArcCatalog to View Metadata 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” Share a Map Package • To package up an entire map document for sharing, use File | Create Map Package ArcMap will force you to create some limited metadata before creating a sharable package. Click OK. 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 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. 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! 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 Sources of GIS Data • Search for selected base layers (reference maps) from right within the application • GeoStor (Arkansas state portal) • geo.data.gov (federal portal) • National Map (USGS) • TIGER/Census Shapefiles (reference layers – boundaries, roads) LibGuide • The Maps, GIS and Remote Sensing LibGuide can point you to: – Information on how to get Esri software through the campus license – Resources for learning GIS – Sources of GIS data (spatial and attribute) Good luck! Thank you!