GIS For Engineering (MCQ) 5 — Questions and Answers
Question 1: In GIS, what does OGC stand for, and why is it important for engineering applications?
- Open Geospatial Consortium; it defines interoperability standards for spatial data and services (Correct answer)
- Online Geographic Catalog; it hosts downloadable map layers
- Open Grid Computing; it enables parallel raster processing
- Official Geodesy Commission; it defines datum standards
Correct answer: Open Geospatial Consortium; it defines interoperability standards for spatial data and services
The Open Geospatial Consortium (OGC) publishes open standards such as WMS, WFS, and GeoJSON that ensure different GIS systems can exchange spatial data seamlessly.
Question 2: A GIS analyst overlays a parcel layer with a flood zone layer and needs to keep ALL parcels, showing which ones intersect the flood zone and which do not. Which tool is most appropriate?
- Clip
- Spatial Join (Correct answer)
- Intersect
- Buffer
Correct answer: Spatial Join
A Spatial Join appends flood zone attributes to all parcels based on their spatial relationship, preserving all parcels regardless of whether they intersect the flood zone.
Question 3: What is the primary advantage of a file geodatabase over a shapefile for engineering GIS projects?
- Shapefiles support larger file sizes
- File geodatabases support field names longer than 10 characters, subtypes, domains, and relationship classes (Correct answer)
- Shapefiles natively store topology
- File geodatabases are plain text and easily edited
Correct answer: File geodatabases support field names longer than 10 characters, subtypes, domains, and relationship classes
File geodatabases overcome shapefile limitations: field names are not restricted to 10 characters, and they support domains, subtypes, topology, relationship classes, and attachments.
Question 4: Which interpolation method is considered an exact interpolator because it passes through all input data points?
- Inverse Distance Weighting (IDW)
- Kriging
- Natural Neighbor
- Spline (Correct answer)
Correct answer: Spline
Spline (specifically regularized spline) is an exact interpolator that fits a mathematically smooth surface that passes exactly through all input data points.
Question 5: In GIS coordinate systems, what is a 'false easting' and 'false northing' used for?
- To convert geographic to projected coordinates
- To shift the origin so all coordinates in the zone are positive (Correct answer)
- To correct for the flattening of the Earth
- To define the central meridian of a UTM zone
Correct answer: To shift the origin so all coordinates in the zone are positive
False easting and northing are constant values added to coordinates to eliminate negative values within a projected zone, simplifying calculations and avoiding sign errors.
Question 6: What type of GIS analysis would an engineer use to determine the optimal path for a new pipeline that minimizes slope, avoids protected areas, and minimizes cost?
- Hot spot analysis
- Least-cost path analysis (Correct answer)
- Kernel density estimation
- Thiessen polygon generation
Correct answer: Least-cost path analysis
Least-cost path analysis uses a cost-distance raster (combining slope, land use, and cost layers) to find the route with the minimum cumulative traversal cost between two points.
Question 7: Which metadata standard is most commonly used in the United States for documenting GIS datasets in engineering and government projects?
- Dublin Core
- FGDC Content Standard for Digital Geospatial Metadata (Correct answer)
- ISO 19115
- INSPIRE Directive
Correct answer: FGDC Content Standard for Digital Geospatial Metadata
The FGDC (Federal Geographic Data Committee) Content Standard for Digital Geospatial Metadata is the federally mandated standard for geospatial metadata documentation in US government and associated engineering projects.
GIS For Engineering (MCQ) 5
In GIS, what does OGC stand for, and why is it important for engineering applications?