For this assignment you will need to adjust the projections of several layers to make a coherent map.

In addition to the written directions below, you can also see this lab demonstrated in a screencast here.

Instructions

Go to the network drive and copy the data in the Assignment 3 folder to a local disk or your network folder.

Start ArcMap and create a new, empty map. Go to the connection you just created and add “richland.shp”. After you’ve added Richland County, go ahead and add “calhoun.shp”, “fairfield.shp”, “kershaw.shp”, “lexington.shp”, and “sumter.shp”.

Click the globe icon in the toolbar to view the entire map. The various counties are all in different projections, datums, and coordinate systems, but only Richland has a coordinate system defined. The other counties are all over the place. You need to figure out what projection/datum/coordinate system each county is in and reproject them in NAD83 UTM Zone 17N.

To make this a little easier, here is the list of coordinate systems that the different counties are currently in:

• NAD27 State Plane South Carolina North
• NAD83 Decimal Degrees
• NAD83 State Plane South Carolina (feet)
• NAD83 UTM Zone 16N
• WGS72 UTM Zone 17N

Once you have deduced which projection a county is, you need to define the shapefile as being in that projection. Open up the ArcToolbox pane and go to Data Management Tools > Projections and Transformations > Define Projection. Select the shapefile and choose the proper projection. Do this for each shapefile.

The coordinate systems above can be found under Projected Coordinate Systems, except for NAD83 Decimal Degrees, which is found under Geographic Coordinate Systems (because there is not projection associated with that coordinate system).  ArcGIS has many options for NAD83; choose the one that is simply listed as “NAD 1983.prj”.

After you define the projection, the shapefile should appear in the appropriate place relative to Richland county.

After defining a projection for a shapefile, you need to project it in NAD83 UTM Zone 17N. Go to Data Management Tools > Projections and Transformations > Feature > Project. Select your shapefile in the input box, choose NAD 1983 UTM Zone 17N for the projection. If your starting projection is not some variant of NAD83, you will need to choose an appropriate transformation or transformations in the Geographic Transformation box.

After reprojecting all of your counties, create a map of Richland and surrounding counties. Use a nice looking color scheme and make sure each adjacient county is a distinct color. Export it as a PDF. Right-click on each of your newly projected layers (the ones with “_project” in the name) in the layers pane and go to “Properties”.  Click on the Source tab.  Copy the four numbers in Extent (Top, Bottom, Left, and Right).

What to Turn In

Go to Blackboard and find Assignment #3 in the Assignments section and submit your pdf map of Richland, Calhoun, Fairfield, Kershaw, Lexington, and Sumter counties, all in the same projection. Attach a file with the coordinates for the extent for each layer.

How You Will Be Graded

Half of the assignment grade will be based on your map, the other half will be based on having the correct bounding coordinates. All counties must appear in the proper position on the map. The color choices should be asthetically pleasing and make the counties easily distingushable.

Due Date

This assignment is due on Tuesday, January 31st at the beginning of class. Any assignments turned in after that moment will be given only half credit.

For this assignment, you will need to make:

1. A choropleth map
2. A graduated symbol map
3. A dot map

Instructions

Start ArcCatalog. Create a connection to I:\563S12\

Choropleth Map

Start ArcMap and create a new, empty map. Go to the connection you just created and add “sccounties.shp”.

View the attribute table and take a look at the available attributes. Pick one that’s suitable for display on a choropleth map.

Open the layer properties and change the symbology to “Graduated colors”. Select the attribute you want to map in the “Value” field. Choose a color scheme other than the default that is suitable for the data you’re displaying.

Go to the layout view and add any additional symbols you think are necessary. Your map should stand on it’s own and show everything I need to interpret the data you’ve displayed.

Save your map, then export your map as a PDF. Make sure you make your own last name and “choropleth” are in the filename so I’ll know whose this is when it comes time to grade.

Proportional Symbol Map

Create a new map. Add “sccounties.shp”.

View the attribute table and take a look at the available attributes. Pick one that’s suitable for display on a graduated symbol map.

Open the layer properties and change the symbology to “Proportional symbols”. Change the background to a more aesthetically pleasing color than the default. Select the attribute you want to map in the “Value” field. Change the “Min Value” dot to a more appropriate size and a more pleasing color (you may have to experiment to find a size that works well).

Go to the layout view and add any additional symbols you think are necessary. As with the choropleth map, your map should stand on it’s own and show everything I need to interpret the data you’ve displayed.

Save your map, then export your map as a PDF. Make sure you make your own last name and “proportional symbol” are in the filename so I’ll know whose this is when it comes time to grade.

Dot Map

Create a new map. Add “sccounties.shp” and “SCCensusTracts.shp”.

Change the color of the county layer to something more aesthetically pleasing than the default.

Open the layer properties for the census tract layer and change the symbology to “Dot density”. Select “POP” and click on the right-pointing arrow to add it to the symbol box.

Choose an appropriate dot size, color, and dot value the map (you may want to experiment a bit to find some values you like). Change the background fill and line colors to “No Color”.

Go to the layout view and add any additional symbols you think are necessary. Again, your map should stand on it’s own and show everything I need to interpret the data you’ve displayed.

Save your map, then export your map as a PDF. Make sure you make your own last name and “dot map” are in the filename so I’ll know whose this is when it comes time to grade.

What to Turn In

Go to Blackboard and find Assignment #2 in the Assignments section and submit your pdfs. Make sure you attach all three maps before you submit!

How You Will Be Graded

Each of your three maps will be graded seperately and count for one third of the assignment grade. You will be graded on the following factors:

• Choosing an attribute suitable for that type of map (choropleth and proportional symbol only)
• Choosing a suitable color scheme that communicates the proper information (choropleth only)
• Choosing a good symbol size (proportional symbol)
• Choosing a good dot size and value (dot map)
• Adding suitable additional symbols (legends, north arrows, neatline, scales, titles, text, etc.)
• Not adding extraneous or unneeded symbols
• Aesthetics

Due Date

This assignment is due on Tuesday, January 24th at the beginning of class. Any assignments turned in after that moment will be given only half credit.

When commenting, use your first and last name, so I can give you proper credit for completing the assignment. I will have to moderate your first post, but as long as you use the exact same name and e-mail address when making future posts they will show up immeaditely, rather than having to wait until I approve them.

Please e-mail me and make your post by the start of class on January 17th.

Basemap data from ESRI

File > Add Basemap
Zoom in on Columbia

Creating and editing point feature classes

Open the ArcCatalog pane and right click on your default geodatabase. New > Feature Class.

Create a point feature class and call it PointTest.

Go Customize > Toolbars > Editor

On the editor toolbar click on Editor > Start Editing

On the Create Features pane click on PointTest, then click somewhere on the map. It should create a new point. Do this several more times.

Click on the Edit Tool (small black chevron) on the Editor Toolbar. Click on one of your points to select it. Now click and drag to move it.

On the editor toolbar click on Editor > Save Edits, then Editor > Stop Editing

Creating and editing line feature classes

Open the ArcCatalog pane and right click on your default geodatabase. New > Feature Class.

Create a point feature class and call it LineTest.

On the editor toolbar click on Editor > Start Editing

On the Create Features pane, click on the Organize Feature Templates button. Click on LineTest and click New Template. Create a new template for the LineTest feature class.

On the Create Features pane click on LineTest, then click somewhere on the map. It should create a new vertex for a line. Do this several more times. Double click to finish the line.

Click on the Edit Tool (small black chevron) on the Editor Toolbar. Click on your line to select it. Now click and drag to move it. Notice it moves the whole line as one.

Click the rotate tool (dot with a circular arrow around it) on the editor toolbar. Click on your line and use this to rotate the line.

Click on the split tool (line with a dotted line crossing it) on the editor toolbar. Click someplace on your line. Now click on the edit tool and click on your line to select it. See how the line is now split into two pieces where you clicked it with the split tool.

Click on the edit vertices tool (triangle with a dotted fourth line on it) on the editor toolbar. Click on one of the vertexes of your line and move it. Click again anywhere but a vertex to finalize the move. Click on the edit vertices tool again. This time click on the add vertices button and click anywhere on your line and see the new vertex pop up. Now move the new vertex. Then click on the remove vertex button then click on a vertex and watch how the line changes when that vertex disappears.

Click on the reshape feature tool (just to the right of the edit vertices tool) on the editor toolbar. Click to draw a line that contacts your existing line at at least two points. Double click to finish the line. The new line replaces the old one, but only between the two points where they touch.

Creating and editing polygon feature classes

On the editor toolbar click on Editor > Save Edits, then Editor > Stop Editing

Open the ArcCatalog pane and right click on your default geodatabase. New > Feature Class.

Create a point feature class and call it PolygonTest.

On the editor toolbar click on Editor > Start Editing

On the Create Features pane, click on the Organize Feature Templates button. Click on PolygonTest and click New Template. Create a new template for the PolygonTest feature class.

Click on the Edit Tool (small black chevron) on the Editor Toolbar. Click on your polygon to select it. Now click and drag to move it. Notice it moves the whole polygon as one.

Click the rotate tool (dot with a circular arrow around it) on the editor toolbar. Click on your polygon and use this to rotate the line.

Click on the split tool (rectangle with a dotted line crossing it) on the editor toolbar. Click two different spots to create a line cutting through your polygon, the double click to finish the line. Now click on the edit tool and click on your polygon to select it. See how the polygon is now split into two pieces where you cut it with the split tool.

Click on the edit vertices tool (triangle with a dotted fourth line on it) on the editor toolbar. Click on one of the vertexes of your polygon and move it. Click again anywhere but a vertex to finalize the move. Click on the edit vertices tool again. This time click on the add vertices button and click anywhere on your line and see the new vertex pop up. Then click on the remove vertex button then click on a vertex and watch how the line changes when that vertex disappears.

Click on the reshape feature tool (just to the right of the edit vertices tool) on the editor toolbar. Click to draw a line that cuts through your polygon. Double click to finish the line. The polygon gets cut along the line and the smaller part disappears..

On the editor toolbar click on Editor > Save Edits, then Editor > Stop Editing

Adding data based on coordinates

Open the ArcCatalog pane and right click on your default geodatabase. New > Table.

Create a point feature class and call it TableTest. Add two fields called X and Y of Data Type Double.

Open TableTest.

On the editor toolbar, click start editing.

Click on the existing row to add a row. Type in –81.0264 in the X column and 33.9958 in the Y column.

On the editor toolbar click on Editor > Save Edits, then Editor > Stop Editing

Click File > Add Data > Add XY data. The table should be TableTest. The X and Y field should be obvious. Change the coordinate system to NAD83 (under geographic coordinate systems).

Right click on the new TestTable Events layer and click Zoom to Layer. You should have a dot where Callcott is.

This is not an assignment, there is nothing to turn in.

Instructions

Go to the department’s GIS server and download the “Columbia addressmatchable roads” file (richlex). Unzip it and copy the files into the directory where you’ll be doing this assignment.

Calculate the Travel Time

Launch ArcGIS and add the richlex.shp file.  Open the attribute table and use the Options button to add a new field called “Time”.  Make the type Double.  Right click on the new field’s header and open the field calculator.  Use the length and speed fields to calculate the travel time.  The length field is in meters and the speed is in miles per hour, so you’ll have to do some conversion to get a meaningful result.  You can multiply the length in meters by 0.000621371192 to get miles.  Once you find the time in hours, multiply by 60 to get minutes. Delete the existing field called Seconds.

Create a Network Dataset

Launch ArcCatalog and navigate to the location where you unzipped the roads shapefile. Make sure the Network Analyst extension is turned on (go to Tools > Extensions… and make sure the box next to Network Analyst is checked). Right click on the richlex shapefile and select New Network Dataset. When it asks which attributes to use for the network dataset, create a new attribute called “Time”, that uses minutes as the units and click the “Use by default” checkbox.  Otherwise use the defaults.  When it asks if you want to build the dataset, do so.

Create Service Area

Launch ArcMap. Again, make sure the Network Analyst extension is enabled (go to Tools > Extensions… and make sure the box next to Network Analyst is checked). If the Network Anylist toolbar isn’t displayed, click on View > Toolbars > Network Analyst. Add the street network dataset you created to the map and say yes when it asks if you want all the feature classes that participate in the dataset.

On the Network Analyst toolbar, click on Network Analyst and choose New Service Area. Click on the Find tool and use the Address tab to find 709 Bull Street, Columbia, SC. Right click on the address that comes up and select “Add as Network Location”.

Click on the Show/Hide Network Analyst Window button. The button next to the dropdown brings up the properties dialog. In the Analysis Settings tab, reset the Default Breaks to 10 minutes and click OK. Click the Solve button on the toolbar to calculate a ten minute driving distance service area around Callcott.

Make a map showing the service area and export it as a PDF.

Calculate Shortest Path to Irmo

On the Network Analyst toolbar, click on Network Analyst and choose New Route. Click on the Find tool and use the Address tab to find 709 Bull Street, Columbia, SC again. Use U.S. Address Finder Tele Atlas for the address locator. Right click on the address that comes up and select “Add as Network Location”. This should be Stop 1 in the route layer.

Use the Create Network Location tool to create another stop at the intersection of I-26 and Lake Murray Blvd.

Click on calculate to find the shortest path. Open up the Routes attribute table and write down how many seconds it takes to get from Callcott to Lake Murray Blvd.

Create another network location on the bridge over the Broad River. Click and drag this one down so it’s under barriers rather than stops. Note how the path changes. Open up the Routes attribute table again and write down how many seconds it takes to get from Callcott to Lake Murray Blvd and I-26 if the I-126 bridge over the river were blocked.

Calculate Your Own Shortest Path

Pick three locations, either graphically or using the Find feature. Don’t use any of the points from the route to Irmo, pick three new points. Calculate a round robin trip between them so that the route goes from the origin, to the first destination, to the second destination, back to the origin. Create a map showing your trip and label all three destinations. Export it as a PDF

What to Turn In

Go to Blackboard and find Assignment #9 in the Assignments section. Attach your map of the 10 minute service area around Callcott and your map of the round robin route. Include the following information:

1. How long does it take to get from 709 Bull Street to I-26 and Lake Murray Blvd?
2. How long does it take to get from 709 Bull Street to I-26 and Lake Murray Blvd if the I-126 bridge over the Broad River is blocked.

How you Will Be Graded

The routing portions of the assignment will be graded based on the accuracy of your answers. The service area portion will be graded on the accuracy and asthetics of your map. The round robin portion will be graded on the quality of your map.

Due Date

This assignment is due on Tuesday, November 22nd, at the beginning of class. Any assignments turned in after that moment will be given only half credit.

Instructions

Copy the Earthquakes and ClusterPointsClipped files to your network folder or a local drive.

Nearest Neighbor

The ClusterPointsClipped shapefile gives the starting point for around 3000 transit trips in Salt Lake City.

Launch ArcGIS and add the ClusterPointsClipped.shp to the map. Click on the toolbox button to open the tools pane. Use the Average Nearest Neighbor tool (Spatial Statistics Tools > Analyzing Patterns > Average Nearest Neighbor) to analyze the point pattern. Change the distance measure from Euclidian to Manhattan Distance, but otherwise use the defaults.. Note the average nearest neighbor value. Are the points clustered, random, or dispersed?

Moran’s I

The Earthquakes shapefile has the location and magnitude of 90 small earthquakes in California. Launch a fresh instance of ArcGIS and add Earthquakes.shp to the map. Use the Spatial Autocorrelation tool (Spatial Statistics Tools > Analyzing Patterns > Spatial Autocorrelation) to run a Moran’s I analysis on the data (use the default inverse distance method). Are the earthquake strengths spatially autocorrelated? Try at least two other distance weighting methods. Do the results change when you use these methods?

What to Turn In

Go to Blackboard and find Assignment #8 in the Assignments section and turn in your answers to the questions above.

How You Will Be Graded

You will be graded on the completeness and correctness of your answers.

Due Date

This assignment is due on Thursday, November 10th at the beginning of class. Any assignments turned in after that moment will be given only half credit.

Instructions

Copy the entire Richland_DEM folder from the Assignment 7 folder to the local hard disk or a flash drive. This is a pretty big raster file (about 30mb), so make sure wherever you’re putting it has enough space. Also copy the ‘Rich_landcover.shp’, ‘Rich_highschools.shp’, ‘sccounties.shp’, and ‘SCWeather.shp’ files.

Convert Land Cover to Raster

Launch ArcMap and add Rich_landcover.shp to the map. Activate the Spatial Analyst extension (go to Tools > Extensions… and check the box next to Spatial Analyst).

The land cover layer stores the type of land use or cover in two ways: a single digit field called LEVEL1 that breaks down land cover into nine categories, and a two digit field called CODE which breaks down the type of land use/cover in more detail. See the table below for details on each type of land use/cover.

Anderson Level 1 & 2 Landcover Codes

1Urban/ Built-up

11Residential

12 Commercial

13Industrial

14Transportation/Communications/Utils.

15Industrial/Commercial Complexes

16Mixed Urban

17Other Urban

2Agricultural

21Crops and Pastures

22Orchards, Vineyards, Nurseries

23Confined Feeding Operations

24Other Agricultural

3Rangeland

31Herbaceous Rangeland

32Shrub & Brush Rangeland

33Mixed Rangeland

4Forests

41Deciduous Forests

42Evergreen Forests

43Mixed Forests

5Water

51Streams & Canals

52Lakes

53Reservoirs

54Bays & Estuaries

6Wetland

61Forested Wetlands

62Non-forested Wetlands

7Barren Land

71Dry Salt Flats

72Beaches

73Sandy Areas (non beach)

74Bare Exposed Rock

75Strip Mines, Quarries

76Transitional Areas

77Mixed Barren

8. Tundra

81 Scrub and brush tundra

82 Herbaceoous tundra

83 Bare Ground

84 Mixed tundra

9 Perennial snow ice

91 Perennial snowfields

92 Glaciers

Activate ArcToolbox and use the Feature to Raster tool (Conversion Tools > To Raster > Feature to Raster) to create two raster layers based on the landcover shapefile. Name the first one level1 and base it on the “LEVEL1″ field. Use a 100 meter cell size. Name the second one level2 and base it on the “CODE” field

Select High Altitude Forest Cells

Add the richland_dem layer to the map. Activate the Single Output Map Algebra tool (Spatial Analyst Tools > Map Algebra > Raster Calculator).

The goal here is to create a new layer that has all the cells that are forest in the level1 land cover raster and are over 500 feet according to the DEM. To do this use the Map Algebra CON command. The CON command is basically an IF statement. The syntax is:

CON (<condition>, <value if true>, <value if false>)

To create a new raster that meets two conditions (the cell is forest and it’s over 500 feet) use the “&” opearator to combine the two conditions. Since we don’t care about cells with forest or under 500 feet, we can just leave out the <value if false> portion. This gives us the following command:

CON ((level1==4) & (richaland_dem>500), 1)

Right click on the resultant layer and open the attribute table. Write down how many cells have forest and are over 500 feet.

Create Thiessen Polygons

Add the Rich_highschools shapefile to the map. Use the Create Thissen Polygons tool to create Thiessen Polygons around each high school (Analysis Tools > Proximity > Create Thiessen Polygons). Set the Output Fields dropdown to “ALL”.

Use the Feature to Raster tool to convert the Thiessen polygons to a raster. Choose “NAME” for the field and set the output cell size to 100.

Use the Raster Calculator tool and the CON command to create a new raster which includes only the Thiessen polygon cells which have the residential land use.

CON (level2==11, Thiessen polygon raster)

Right click on the new layer and open the attribute table. Write down how many residential cells are inside the Thiessen polygon of W J Kennan High School.

Kriging

Start a new copy of ArcMap and add sccounties.shp and SCWeather.shp to the map. Use the Kriging tool (Spatial Analyst Tools > Interpolation > Kriging) to create a raster layer showing the precipitation across the state. Choose “PRECIP” under the Z value field, give the new raster a sensible name, and keep the defaults for all the other settings.

Use the Clip tool (Data Management Tools > Raster > Raster Processing > Clip) to remove the parts of the Kriging output that are outside of South Carolina (there will still be some bits of the state it doesn’t cover near the edges).  Make sure you check the “Use Input Features for Clipping Geometry” checkbox.

Choose an asthetically pleasing color scheme and create a map showing precipitation throughout the state using the interpolation you just created. Export the map as a .pdf, using your name as the filename so I will know who’s it is.

What to Turn In

Go to Blackboard and find Assignment #7 in the Assignments section. Upload your precipitation map. Also include the following information.

1. How many grid cells are forested and over 500 feet elevation?
2. How many residential cells are inside the Thiessen polygon of W J Kennan High School?

How You Will Be Graded

The land cover portions of the assignment will be graded based on the accuracy of your answers. The Kriging portion will be graded on the accuracy of your output raster an the asthetics of your map.

Due Date

This assignment is due on Tuesday, October 21st at the beginning of class. Any assignments turned in after that moment will be given only half credit.

Instructions

Copy all the files for ’Salt_Lake_Transit_Stops.shp’ from the Assignment 6 folder to your network folder or a local drive.

Go to the ESRI Census 2000 TIGER/Line Data page. Select Salt Lake County, Utah and download the Census Blocks 2000, and Census Block Demographics files.

Create a New Geodatabase

Open ArcCatalog and create a new personal geodatabase. Name it after yourself so I can give you credit when grading. Import the census block shapefile, giving it a more sensible name than the cryptic one bestowed by the Census (note that feature class names can’t contain spaces). Use the define projection wizard to assign the proper projection to the census block feature class (all Census TIGER data is in NAD83 decimal degrees). Import the Census demographics data table to the geodatabase.

Join the Census Data

Open ArcMap and add the Census Blocks feature class and the Census data table. Join the table and the feature class together using the STFID field.

Create a Domain

Return to ArcCatalog. Bring up the geodatabase’s properties and click on the domain tab. Create a new domain called Stop Type. This new domain should have a Field Type of Text, a Domain Type of Coded Values. Leave Split policy and Merge policy as default values. For the coded values, enter Bus and Light Rail. Enter a useful description in the description fields for the domain and coded values.

Create a New Feature Class

Create a new feature class called Transit Stops. This should be a point feature class, without any M or Z values. Set the coordinate system to “NAD 1983 UTM Zone 12N”. Leave the XY tolerance at the default value. Import the fields from Salt_Lake_Transit_Stops.shp. In addition, add a new field called StopType with the Text data type. Choose the Stop Type domain you created earlier and set the default value to Bus.

Once you’ve finished creating the new feature class, right click on it and load data. Use Salt_Lake_Transit_Stops.shp as the data source. Make sure LOCATIONID matches in the source and target fields. There won’t be any math for StopType. Load all of the source data.

Switch back to ArcMap and add the transit stops tp the map. Open the attribute table and use the field calculator to set the StopType to “Bus” (including the quotes). Not all of these stops are bus stops, however. Start an edit session and change all the stops with a LOCATIONID of 24 or less to the Light Rail stop type.

Spatial Query

Select by attributes to get only the light-rail stops. Select by location to find all the census blocks within half a mile of the light-rail stations. Use the statistics tool to find how many people live in the selected blocks.

Spatial Join

Right click on the CensusBlock layer and join the transit stop layer using a spatial join. Choose for each polygon to be given a summary of the points within, but don’t check any of the boxes. Output the results as a feature class in your personal geodatabase. This new layer will have a field called count showing how many transit stops are in each census block.

Zip Your Database

Right click in the folder with your personal geodatabase and select New > Compressed (zipped) Folder. Copy your personal geodatabase into the new folder. Make sure you get the file that ends in “.mdb”.

What to Turn In

Go to Blackboard and find Assignment #6 in the Assignments section. Attach the zip file with personal geodatabase. Also include the number of people living within half a mile of a light-rail station.

How You Wil Be Graded

You will be graded on the accuracy of your numeric answer and whether your Geodatabase includes all the correct elements.

Due Date

This assignment is due on Tuesday, October 11th at the beginning of class. Any assignments turned in after that moment will be given only half credit.

For this assignment you will use attribute based queries, spatial queries, and the overlay tool to get attribute information for certain census blocks.

Instructions

Copy all the files for ‘CensusBlocks.shp’, ‘Lightrail_stations.shp’ and ‘StationServiceAreas.shp’ to your network folder or a local drive.

Start ArcMap and create a new, empty map. Go to the connection you just created and add ‘CensusBlocks.shp’.

Attribute Queries

Use the Select By Attributes tool to select all census blocks with 100 or more people. Record the number of selected blocks.

Select all census blocks with a median age of 60 or more and a population of 10 or more people. Record the number of selected blocks.

Spatial Queries

Add ‘Lightrail_stations.shp’ to the map. Use the Select by Location tool to select all census blocks within a distance of half a mile of the lightrail stations. Open up the Census Blocks attribute table and use the statistics tool to figure out how many people live in the selected blocks and record their total population

Add ‘StationServiceAreas.shp’ to the map. Use the Select by Location tool to select all census blocks that intersect the service areas. Again, use the statistics tool to figure out how many people this is and record their total population.

Use the Select by Location tool to select all census blocks that are within the service areas. Record the total population of the selected census blocks.

Finally, use the Select by Location tool to select all census blocks that have their centroid within the service areas. Record the total population of the selected census blocks. Clear the selected features.

Overlay

Open the attributes table for Census Blocks and create two new fields named “Area” and “Density”. Both fields should use the Float type. Right click on the header of the Area field and select Calculate Geometry. Calculate the area of each census block in square miles. Right click on the header of the Density field and use the Field Calculator to calculate the population density of each census block ([POP2000] / [Area]).

Open the ArcToolbox pane and use the Intersect tool (Analysis Tools > Overlay > Intersect) to create a new layer from the Station Service Areas and Census Blocks layers. Open the attributes table for this new layer and create two new fields named “NewArea” and “Population”. Again, both fields should use the Float type. Right click on the header of the NewArea field and select Calculate Geometry. Calculate the area of each polygon in square miles. Right click on the header of the Population field and use the Field Calculator to multiply the new area by the population density to give the population of each polygon ([NewArea] * [Density]). Use the statistics tool to find the total population in all of the census blocks in the layer. Record the total population of the layer’s census blocks.

What to Turn In

Go to Blackboard and find Assignment #5 in the Assignments section and submit the following information:

1. Number of census blocks with 100 or more people.
2. Number of census blocks with a median age of 60 or above and at least 10 people.
3. Number of people living in census blocks within half a mile of a light-rail station.
4. Number of people living in census blocks that intersect the station service areas.
5. Number of people living in census blocks that are within the station service areas.
6. Number of people living in census blocks that have their centroids within the station service areas.
7. Number of people living within the service areas, assuming people are evenly distributed through each census block.

Make sure you label each of these pieces information. Don’t just send me a list of seven mysterious numbers!

How you Will Be Graded

The entire assignment grade will be based on the accuracy of the numbers you turn in.

Due Date

This assignment is due on Tuesday, October 4th at the beginning of class. Any assignments turned in after that moment will be given only half credit.