1⟩ Island polygons are only used to represent real world islands that are surrounded by water.
1. True
2. False
False
Spatial Data
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29 Spatial Data Questions And Answers
2⟩ What is the name of the Open GIS Consortiums XML-based universal data standard?
1. DNF
2. GML
3. HTML
4. SDTS
5. DNF
GML
3⟩ A map at a scale of 12,000 would be suitable for planning street engineering works such as repairs to gas or water pipes.
1. True
2. False
True
4⟩ A line is a string of (x, y) coordinates joined in order and connected with straight lines.
1. True
2. False
True
5⟩ A map at a scale of 1250,000 would be suitable for navigation whilst on a mountain trek.
1. True
2. False
False
6⟩ What scale of measurement may be used to represent area?
1. Interval
2. Ordinal
3. Ratio
4. Nominal
Ratio
7⟩ Resolution may best be defined as
1. the smallest feature that can be mapped or measured
2. the smallest unit or measurement into which data can be disaggregated
3. the overall quality of a data set
4. the size of the smallest recording unit
5. the accuracy and precision of the data
The size of the smallest recording unit
the smallest feature that can be mapped or measured
8⟩ Which type of projection is The UKs Ordnance Survey National Grid?
1. Universal Transverse Mercator
2. Lambert Conformal Conic
3. Alber's Equal Area
4. Interrupted Goode Homolosine
Universal Transverse Mercator
9⟩ Using the UK postcode system, the postcode DL7 8 represents which of the following levels of this hierarchical system.
1. Postal area
2. Postal district
3. Postal sector
4. Unit postcode
Postal sector
10⟩ How many satellites are used in the US NAVSTAR GPS satellite constellation?
1. 25
2. 15
3. 30
4. 20
5. 24
24
11⟩ What is Edge matching?
Edge matching is simply the procedure to adjust the position of features that extend across typical map sheet boundaries. Theoretically data from adjacent map sheets should meet precisely at map edges. However, in practice this rarely occurs. Misalignment of features can be caused by several factors including digitizing error, paper shrinkage of source maps, and errors in the original mapping. Edge matching always requires some interactive editing. Accordingly, GIS software differs considerably in the degree of automation provided.
12⟩ What does the abbreviation GPS stand for?
1. Geographical Point Software
2. Global Point Selection
3. Global Positioning System
4. Geographical Position System
Global Positioning System
13⟩ What is the name of the Russian equivalent of GPS?
1. IKONOS
2. GPESKI
3. GLASNOST
4. GLONASS
GLONASS
14⟩ What is Conflation?
Conflation is formally defined as the procedure of reconciling the positions of corresponding features in different data layers. More commonly this is referred to as sliver removal. Often two layers that contain the same feature, e.g. soils and forest stands both with a specific lake, do not have exactly the same boundaries for that feature, e.g. the lake. This may be caused by a lack of coordination or data prioritization during digitizing or by a number of different manipulation and analysis techniques. When the two layers are combined, e.g. normally in polygon overlay, they will not match precisely and small sliver polygons will be created. Conflation is concerned with the process for removing these slivers and reconciling the common boundary.
15⟩ The Mercator projection is an example of a cylindrical projection.
1. True
2. False
True
16⟩ The depth of water in a lake is an example of a ratio scale measurement.
1. True
2. False
True
17⟩ The Prime Meridian runs through Moscow.
1. True
2. False
False
18⟩ LIDAR data are collected using laser technology.
1. True
2. False
True
19⟩ What is coordinate thinning?
Coordinate thinning involves the weeding or reduction of coordinate pairs, e.g. X and Y, from arcs. This function is often required when data has been captured with too many vertices for the linear features. This can result in redundant data and large data volumes. The weeding of coordinates is required to reduce this redundancy.
20⟩ What is geometric transformations?
Geometric transformations function is concerned with the registering of a data layer to a common coordinate scheme. This usually involves registering selected data layers to a standard data layer already registered. The term rubber sheeting is often used to describe this function. Rubber sheeting involves stretching one data layer to meet another based on predefined control points of known locations. Two other functions may be categorized under geometric transformations. These involve warping a data layer stored in one data model, either raster or vector, to another data layer stored in the opposite data model. For example, often classified satellite imagery may require warping to fit an existing forest inventory layer, or a poor quality vector layer may require warping to match a more accurate raster layer.
