GEOG 4/575 Lab 7: Dynamic Segmentation and Network Analysis

 

Due Nov 30 (Tuesday) before class.

The full score for this lab is 15 points.

 

The exercise comprises two parts related to two themes in linear feature analysis in GIS: dynamic segmentation and network analysis. The former focuses on applications that require location information on linear features. The latter emphasizes more on the connectivity of linear features than on the locations.

 

            For the first part, finish all but the 1st task in Chang's Chapter 16. If you have not done geocoding (i.e., address matching) before, you should do Task 1 on your own. For the second part, finish Tasks 3, 4, 5 and 6 in Chang's Chapter 17. Answer and submit all questions listed at the end of this instruction. Lab exercise data are available in: I:\Students\Instructors\Geoffrey_Duh\GEOG4575\Chang_5e\chap16 and 17 (or on the textbook CD). Please copy all these folders to your working directory in c:\Students before you start.

 

Part I (Chapter 16)

 

Additional notes:

  1. There is no "Tool" menu in ArcGIS 10's main menu bar. You can find the "Customize mode..." tool in the "Customize" menu when adding the Indentify Route Locations tool.
  2. Add Route Events tool can be found from ArcMap's File/Add Data menu.
  3. Task 4, Step 1. Please refer to Task 2 in Chapter 13 for instructions on how to create the final slope shapefile.

 

Part I Questions:

1)      What is the data source information in the properties dialog window of the "SpeedLimitsDecAll Events" layer that you created in Task 2? Is "SpeedLimitsDecAll Events" a polyline feature class? If it's a feature class you should be able to find it in a geodatabase or as a shapefile.

 

2)      In Task 3, how many rest areas are located in forested areas?

 

3)      The identity tool in "Analysis Tools, Overlay" toolset can associate polygon attributes to linear features, a task very similar to the procedures you did in Task 4. The only difference is that identity tool won't generate linear referencing measures. Describe one application that you need to use the procedures that you did in Task 4 instead of the identity tool.

 

4)      The Route5_cities.dbf event table you created in Task 5 contains a new field call distance. What does a negative distance value, such as -1439, mean? Use ArcGIS online help to locate the help on "Locate Features Along Routes" and look up the definition of this distance field. You can use Distance field as the Offset field in the Add Route Events tool to verify the distance values.

 

Part II (Chapter 17)

 

Additional note:

  1. Task 3, step 3. You don't need to model turns in the interstats_ND network.
  2. Task 3, step 4. You need to set the layer to uscities to complete the select by attribute task.
  3. Task 5, step 4. The Oneway for emergency services checkbox is shown as an Oneway checkbox in the Restrictions panel in ArcGIS 10. Uncheck it for this lab exercise.

 

Part II Questions:

1)      What is the data source information in the properties dialog window of interstates_ND that you created in Task 3? If you rename interstates.shp to something else, will you still be able to see the interstates_ND network?

 

2)      Insert maps (screenshots) of the shortest path you generated in Task 3 step 7, Task 5 step 4 and Task 6 step 4. Make sure you clearly label each map.