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1. Click Projections.zip above to download the tutorial data.
2. Open the  Downloads  folder.
3. Right-click  Projections.zip  and select Extract All...
4. In the 'Extract Compressed (Zipped) Folders' window, accept the default location into the Downloads folder and click Extract.
5. Drag  the  Projections  folder onto your Desktop.
6. Close all windows.

Exploring GIS Data

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in ArcGIS Pro

Opening an Existing Project

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This feature class contains the point locations of all schools in Texas. It was obtained from the Download Schools link on the Texas Education Agency (TEA) Texas School District Locator – Data Download website at http://ritter.tea.state.tx.us/SDL/sdldownload.html, which is no longer online, but the same content can be downloaded at the new Texas Education Agency Public Open Data Site at http://schoolsdata2-tea-texas.opendata.arcgis.com/.

1. In the top left of the main Catalog view, click the small "X"  on the Catalog view tab to close all views.

Defining Data Projections

All GIS data is created in a particular geographic coordinate system used for mapping locations on a three-dimensional sphere, based on measurements of latitude and longitude. In addition, much GIS data has already been projected onto a two-dimensional plane, based on linear measurements, such as feet or meters. In order for ArcGIS to position a data layer in its proper geographic location, it must be told the proper coordinate system and projection in which the data was originally created. Otherwise, the data layer can be displayed as an image of sorts, but the image will not necessarily line up correctly spatially with other data layers in the Map Windowmap.

Determining if Layers are Defined

In some cases, the geographic coordinate system and projection of the data has already been defined in ArcGIS, while, in other cases, you will need to define it yourself based on metadata obtained from the source of the data. First, you will need to determine whether or not each feature class has already been defined.

1. In the Catalog pane on the right, expand the Databases folder.
2. Expand the Projections.gdb geodatabase.
3. Click the County feature class to select it.
4. Hold down Ctrl and click the MajorRoads and Schools feature classes, so that all three feature classes are selected.
5. Right, right-click the MajorRoads selected feature class and classes and select Add to New > Map.
6. When the Map loads, right-click on MajorRoads in the Contents pane and select Properties.
7. In the left menu, click the Source tab. Scroll down and expand the Spatial Reference section.

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