1. Which of the following is a format for storing raster data? a) Topology b) Sp

Question

1. Which of the following is a format for storing raster data?

a) Topology

b) Spatial reference

c) Geocoding

d) Cell encoding

2. By applying the reclassification operator to a raster layer, a GIS analyst may:

a) assigen new values to existing cells

b) increase or decrease the total number of classes

c) reduce the total number of raster cells

d) all of the above

3. Which of the following is true for a raster data structure?

a) a 2m grid has a lower resolution than a 20m grid

b) cells in a raster can have multiple values

c) The values "0" and "NODATA" hold the same meaning

d) The node is the point of no further expansion in a quad tree

4. Why is it common practice to store and exchange GIS data in a geographic coordinate system?

Explanation / Answer

1. d) cell encoding

2.d) all of the above

3. c) The values 0 and NODATA hold the same meaning

4. 6 down vote favorite

3 If a coordinate is stored in a geographic coordinate system, it's quite easy to calculate the Distances (geodesic), Point-in-polygon, Areas etc.If you store the coordinates in a projected coordinate system, these things are calculated in a Euclidean way, which means there will be huge distortions if your map covers a larger area of the earth.

So, in my view, storing the coordinates in a geographic coordinate system has the

Since the latter is something that can be done very fast on modern processors, I don't think it would ever be a huge disadvantage.

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