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1. In the Contents pane, right-click the HPDBeats_North layer and selectRemove.
2. In the Contents pane, right-click the HPDBeats_South layer and selectRemove.
3. On the toolbar, click the Save button.

Dissolve

As explained in the tutorial introduction, the collaboration with the schools is going to be based on the police districts, not the police beats. At this point, your HPD layer only displays the police beat boundaries, but its attribute table does tell you the district number corresponding to each beat.

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1. In the Contents pane, right-click the HPDBeats layer and select Remove.
2. Click the Save button.

Clip

Now you will examine the school district boundaries. Though it has been modified for the purposes of this tutorial, the original data can also be obtained online from the City of Houston GIS Database webpage at http://cohgis.houstontx.gov/cohgis2010/index.html[g2]  within the administrative boundary dataset.

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1. Close the attribute table.
2. In the Contents pane, right-click the HPDCrime2010 layer and select Remove.
3. In the Contents pane, uncheck the HPDCrime2010_HISD and HISD layers, so that only the HPDDistricts_HISD layer is visible.
4. Click the Save button.

Buffer

The final dataset you will work with contains the locations of all the elementary schools in HISD. Though it has been modified for the purposes of this tutorial, the original data can be obtained online from the Texas Education Agency School District Locator Data Download webpage at http://schoolsdata2-tea-texas.opendata.arcgis.com/

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1. Close the attribute table.
2. Click the Save button.
3. In the Contents pane, uncheck the HISDElemSchools layer and check the HPDCrime2010_HISD layer.

Spatial Join (Points to Polygons)

At this point, you can see all of the violent crime locations along with the half-mile school buffers, but much of the map is so densely covered with overlapping points that it becomes difficult to tell exactly how many points there are and to see the underlying school buffers. In addition, while you can see the spatial distribution of the points, you are not provided with any sort of useful summary of the data. Performing a spatial join will allow you to discover exactly how many violent crimes occurred within a half mile of each school in 2010.

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You can now easily tell which schools have the largest number of violent crimes occurring within a half mile radius.

1. Click the Save button.

Spatial Join (Polygons to Points)

You now have an attribute table that tells you the number of violent crimes that occurred within one year within a half mile of each school, but you would also like to have a table that tells you in which police district each elementary school lies. To create this table, you will perform another spatial join to add the attributes of the police beat to the back of each school that lies inside it.

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