Discovering GIS and ArcGIS Chapter 12: Question 12.1 : How are the major roads i

Question

Discovering GIS and ArcGIS Chapter 12:

Question 12.1: How are the major roads in the county being modeled with raster data?

Question 12.2: How many grid cells does this dataset contain? (Hint: the rows and columns are available to you in the Properties.)

Question 12.3: How many square meters does the entire grid cover? (Hint: the grid-cell size, in meters, is available to you in the Properties.)

Question 12.4: How many zones are in the NLCDmahon raster grid?

Question 12.5: How many cells are in each zone? (That is, how many pixels are in the first zone (11), how many are in the second zone (21), and so on?)

Question 12.6: Why is your answer from Question 12.5 so much lower than the sum total of your answers to Question 12.2? What accounts for this discrepancy?

Question 12.7: How many regions have been created?

Question 12.8: What land use does the region with the greatest number of grid cells represent?

Question 12.9: How much real-world area does this region take up (in square meters)?

Question 12.10: Redo the regiongroup procedure to create a raster called regionG2, but use the four option for number of neighbors instead. (This means that only grid cells that are contiguous in the four cardinal directions will form a group, instead of in all eight directions.) Find the largest region again. How much real-world area does this new region (computed using the four option instead of eight) take up (in square meters)?

Question 12.11: How closely (in terms of the spatial arrangement) does the raster version of Evans Lake match the vector feature class version?

Question 12.12: How many grid cells does Evans Lake consist of when modeled with 100-meter grid cells?

Question 12.13: How does the spatial arrangement of the lake’s 100-meter grid compare to the vector feature class?

Question 12.14: How many grid cells does Evans Lake consist of when modeled with 10-meter grid cells?

Question 12.15: How does the spatial arrangement of the lake’s 10-meter grid compare to the vector feature class?

Question 12.16: What is the advantage of using the lake’s 100-meter raster to represent Evans Lake, and what advantage is there to using the lake’s 10-meter raster to represent Evans Lake?

Explanation / Answer

12.1. Raster data is a set of digital photographs designed with set of rows and columns and containing the information regarding temperature of a region. From this information, raster maps are designed from aerial photographs, satellite imagery, and scanned maps. These based maps are used to design the roads in a city.

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