Midterm Exam : Answer

Transcription

1 Midterm Exam : Answer Create a double-spaced document with answers to the questions below. File Name: LASTNAME_Midterm.pdf Make sure to include your Name, UWNetID, course number, quarter and year, and assignment number on the document (points will be deducted if you have not identified your work). Use a 12-point black font and double spacing for your answers. Convert the document to an Adobe PDF file (points will be deducted if your file is not in PDF format). Upload the PDF file to Catalyst Collect It by the due time: 6PM. Screen capture or explain any intermediate steps or tools you use and include in answer and show your work Question 1 How do you decide whether to use define projection & project operation in ArcMap? (Short Statements) (5) If the layer itself is undefined, then you need to use Define Projection to assign projection to this layer. However, if the layer has its original projection but you need to project to the other projection, you will use Project operation to generate a new projection and you will have a new layer. Question 2 Geodatabase & Data Management (35) 1) Create a file geodatabase, named with your last name, LASTNAME.gdb, and show the snapsot of the process (5) 2) Import the following data into your geodatabase and show snapshot of process and results: (30) a. dem raster layers (location: L:\packgis\forest) b. Boundary, Soil, and Road layer from packgis geodatabase (location: L:\packgis\pcgis.mdb) c. Stream (polyline) and Stand (polygon) coverage files from forest folders (location: L:\packgis\forest) 1) In my M drive, right click on the mouse, then select new > file geodatabase. After finished this step, I type my LASTNAME for this geodatbase

2 2) a. Navigate the Raster Layer: DEM, right click on the mouse then choose Raster to Different Format

3 b. For these three layer, I righ click my mouse of my geodatbase, then choose import -> Feature Class (Multiple), then choose Boundary, Soil, and Road in Packgis.mdb

4 c. Last, add Stream (polyline) and Stand (polygon) into ArcMap, right click these two layer and export them into my geodatabase.

5 Now I have all layers within my Geodatabase now. Question 3 Generate XY points into a map (50) Download the LordHillPark.zip file and unzip it. 1) Add the aerial photo and the Location table (Locations.dbf) into the ArcMap (5)

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7 2) Display XY data as an event layer and a. show a snapshot of the shown window, b. define the layer projection by using the aerial photo as the reference, show the process and results. (15) Right Click on the Table, then choose Display XY Data, then use Edit to import the coordination system

8 After assigned the projection as same as Aerial Photos in the same folder, the Projection system has been redefined. Then click on OK, you will see the result:

9 3) Add the Description.dbf table and join to the event layer by using OBJECTID as the field to join. Show the process and results of join (15) Add the Description.dbf into ArcMap, then right click on event layer, then click on Join Use OBJECTID to connect the Description.dbf into the event layer.

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11 4) Export this layer into your geodatabase and name it as parktrail and show the snapshot. (5) Generate the map of this event layer and the areial photos within the zip file. (10)

12 Question 4 Vector Analysis I (40) Pack Forest is concerned about the flooding issue with their stands. Use the layers within the geodatabase you made to provide the following information for Pack Forest: 1) How many acres will be affected within 300 feet stream buffered area? [Hint: buffer, clip, calculate geometry] Use Buffer tool and set 300 ft as the buffered area, after that, right click the Shape_Area in the attribute table, you will see the value is sq. ft., which equals to 5121 acres.

13 2) Show the result of stream buffer. (10) 3) Show the result of stand cliped area. (10) In order to get the stand attribute, I need to put input is stand and clip by the stream buffer, or use the intersect tool to get the two attributes into the table.

14 4) Show or explain the process how to update the fields by using calculate geometry (10) If you are using Geodatabase, you will not have to update the field, but check the Shape_Area to get the correct value. If you are using shapefile, right click on the area, then choose calculate geometry to update the area.

15 5) Summarize the area (square feet) in different stands (Field: Species) and whose the result of table (10) Open the attribute table, right clicks from SPECIES field, and chooses sum of Shape_Area

16 Question 5 Vector Analysis II (20) After the flooding issue, Pack Forest would like to understand: what are the soils within this flooding area within the Pack Forest Boundary. Hence, you need to help them to get the different soil names and their area within the boundary: 1) Show the soils that intersect with the buffered streams (15) First, Intersect with Soil and Stream

17 Then clip the intersect area within the boundary 2) How many acres will be affected? And which soil (SoilName field) is this? (5)

18 Open the result layer table, right clicks on the AREA field, and then calculates geometry, choose the acre, and then click ok. After that, Use the SoilName as the field to summarize the table, but choose the AREA field. Question 6 Raster Analysis (50) It is important to understand the slope and its application within the Pack Forest boundary. 1) Show how to set up the environment for starting the spatial analysis (10) 2) Use the dem layer in your geodatabase, and reclassify the dem layer by the following elevations categories: (20) a. Elevation <1000 value=1 b. Elevation value=2 c. Elevation >1500 value=3 3) How many acres within the Pack Forest that elevation is less than 1000 feet (show the counts and acres) (10) 4) Use Set Null and/or other spatial analysis tools to eliminate the elevation larger than 1000 feet (from the DEM layer). Show the process and results. (10) 1)

19 2) Use the reclassify tool to reclassify as the window shown

20 3) Already set up the mask as the boundary into the environment, hence my result will be within the boundary The area within 1000 ft has been classified as value 1, so I only need to see the count It has counts, equals to acres. (4) Use set null tool and try to get rid of the value 2 & 3 in the reclassed layer.

21 After running this process, I got the boundary for my DEM layer. I can reset the mask from the environment then run the dem layer from Raster Calculator again. Or, I can use the Extract by Mask function here.

22 After this extracion, I will get the value <1000 feet dem within the Pack Forest boundary.