SO432, Geographical Information Systems

Exam 1, Spring 2014

 

Definitions

10@ 4 points

40

 

Short answers

 6 @ 10 points

60

 

TOTAL

 

100

 

 

 

Read the directions carefully.  You have a selection of questions for the.

 

Quality of your answers is important.   For full credit you should use correct terminology, and show that you understand the concepts involved.  Demonstration of understanding, and placing you answer in the context of GIS, is the most important part of the answer..

 

All work on this exam is individual.  You may not any materials (books, notes, computers, calculators), and you may not use IM, texting, talking, or any other means to communicate with other individuals.

 Red comments are key learning objectives, and not complete answers


 

Definitions:  define 10 of the 12 terms with a concise sentence that clearly shows your understanding of the term.  Each is worth 4 points.

 

1.      Database filtering

2.      DEM

3.      Gazetteer

4.      Integer versus string

5.      Large scale map

6.      Meades ranch

7.      MGRS: 9/18 skips

8.      NGA

9.      Reproject data    11/18 skips

10.  USGS:

11.  UTM zone:

12.  WGS84   earth-centered horizontal datum 

 

Insure that you left two terms blank.  There is no extra credit for answering more than 10.



The next six pages contain 6 questions, each of which is worth 10 points.  You can answer on the page or on the back of one of the pages. You must answer all 6.  For each answer you should clearly show that you understand the principles and use appropriate terminology.

 

 

I downloaded a DEM, and got all these files. 

·        What is a DEM, and what does it provide?

·        Is this vector or raster data, and which file(s) contain the actual data?  How many files must I send someone so they can display this data?

·        What do the files with “meta1” in the name contain, and would it be worthwhile to look to at them?

·        What do the files with “metadata” in the name contain, and would it be worthwhile to look to at them?

 

 Shapefile present with metadata

 



 

 

One of your classmates has two databases, one with the tracts for the state, and other with earnings for the tracts in one of the counties.  The join is set up above, but is not working.

 

What is your classmate trying to do with the join?

Why do you think it’s not working? 

Is there any hope other than re-downloading the data?

 Join record lengths must have exact match

 



These two questions are worth 5 points each.  Answer both.

 

 

 

The planning department for the city of Annapolis wants to find out how much of the city of Annapolis is covered with forest.  Can you recommend any data that would help them get this information, and any GIS techniques they should use to insure that they have the data for just the area within the city boundary?

 

Mask or clip the NLCD

  

 

The Severn and South River keepers in Anne Arundel County think that the region within 100 m of the streams that join their rivers and the bay are the key to the health of the ecosystem.  Can you recommend any data that would help them get the locations of the streams, and any GIS techniques they should use to determine the areas close to a stream?

Buffer

 



·       

 

 

 

The map of Annapolis above has a series of lines overlaid.  The bottom two panels show just the two overlays separately; the upper right shows both, and the upper left show the features of the city.

 

What are the two different sets of lines, and how could you tell?

 

From the orientation of the lines, what can you infer about the projection of the map?

 Lat/long graticule and UTM grid on conic projection

 


 

 

The map of Annapolis above has a series of lines overlaid.  The bottom two panels show just the two overlays separately; the upper right shows both, and the upper left show the features of the city.

 

What are the two different sets of lines, and how could you tell?

 

From the orientation of the lines, what can you infer about the projection of the map?

UTM grid on two different datums on UTM projection

 



 

These four maps show two areas (same area on each row, with different overlays).

·        Why do the maps on the left have three scalebars?  Which needs the three more, and why would you say this?

·        What is the purpose of the circles on the two maps on the right?

·        Why does the lat/long graticule look so different on the two maps?

·        Could the two regions use the same projection?  Why or why not.

·        Are these useful projections?  Why or why not.

Lat/long graticule on Mercator projection at two very different latitudes