1⟩ Which of the following overlay methods would you use to calculate the length of road within a forest polygon?
► 1. Erase
► 2. Union
► 3. Line-in-polygon
► 4. Point-in-polygon
Line-in-polygon
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32 GIS Analysis Questions And Answers
2⟩ What is point-in-polygon overlay?
► 1. A method interpolating point data
► 2. An overlay method used to determine which points lay within the boundary of a polygon
► 3. An overlay method used to determine the distance between a point and it is nearest neighboring polygon
► 4. An overlay method used to reclassify polygon data
An overlay method used to determine which points lay within the boundary of a polygon
3⟩ Which of the following could you use a buffer operation?
► 1. Calculating the distance from one point to another
► 2. Calculating the area of overlap between two polygon data layers
► 3. Determining the area within a set distance from a point, line or area feature
► 4. Calculating the number of observations within a set distance of a point, line or area feature
Determining the area within a set distance from a point, line or area feature
Calculating the number of observations within a set distance of a point, line or area feature
4⟩ Which of the following are considered the main problems facing overlay operations in GIS?
► 1. Selecting threshold criteria
► 2. Topological inconsistencies
► 3. The Modifiable Arial Unit Problem (MAUP)
► 4. Processing overheads
► 5. Visual complexity
Selecting threshold criteria
The Modifiable Arial Unit Problem (MAUP)
Visual complexity
5⟩ Filtering could be used to smooth noisy data caused by problems with data collection devices.
► 1. True
► 2. False
True
6⟩ The most common use of Theissen s Polygons is to create contour lines.
► 1. True
► 2. False
False
7⟩ Assuming a pair of binary raster data layers, which of the following could be used as the equivalent of a Boolean AND overlay in cartographic modelling?
► 1. Layer 1 – layer 2
► 2. Layer 1 + layer 2
► 3. Layer 1 / layer 2
► 4. Layer 1 * layer 2
Layer 1 – layer 2
Layer 1 + layer 2
Layer 1 * layer 2
8⟩ The Jordan method used for point in polygon analysis is also known as the Intersect method.
► 1. True
► 2. False
False
9⟩ Ray tracing is a technique used in network analysis.
► 1. True
► 2. False
False
10⟩ Slope can be calculated from the formula S = b2 - c2.
► 1. True
► 2. False
False
11⟩ Filtering is used on raster data to change the value of a cell based on the attributes of neighboring cells.
► 1. True
► 2. False
True
12⟩ Exact interpolation methods are so called because they give very accurate results.
► 1. True
► 2. False
False
13⟩ What is spatial interpolation?
► 1. The process of establishing values for areas outside the boundary of an existing set of data points.
► 2. The process of modelling spatial pattern from a set of one or more data layers
► 3. The process of establishing values for areas between an existing set of discrete observations
► 4. The process of establishing a statistical relationship between two spatially correlated variables
The process of establishing values for areas between an existing set of discrete observations.
14⟩ It is an ecological fallacy to assume that all the individuals within a defined area have the same level of income.
► 1. True
► 2. False
True
15⟩ Do you know what is the basic work of a GIS technician?
A GIS technician works closely with end users to identify GIS data requirements and handle technical issues. It is also the job of a GIS technician to manage data maintenance and manipulation and handle extraction activities along with ensuring preparation, planning and updating a variety of maps and drawings to be part of a GIS database.
16⟩ ZVI is the abbreviation for Zone of Varying Intensity.
► 1. True
► 2. False
False
17⟩ Do you know the name of two data structures that have the capacity to hold spatial data?
The two data structures that can hold spatial data include raster and vector.
18⟩ What is geo-coding?
Geo-coding is when you associate a place name or an address with map coordinates.
19⟩ What is geo-referencing?
Geo-referencing is the process of associating plain digital images taken from a satellite or a plane with map coordinates so that they can be overlaid on street maps.
20⟩ Do you know the top 5 skills in GIS?
Skills in spatial data handling, algorithms, data conversion, model building and database programming.
