GIS Exam #2 Questions with Complete Solutions (Latest 2025) Data models are a set of rules and/or constructs used to describe and represent aspects of the real world in a computer. Two primary data models are available to complete
this task: raster data models and vector data models. -
Correct Answers ✅Data Model Spatial data is usually stored as coordinates and topology, and is data that can be mapped. Spatial data is often accessed, manipulated or analyzed through Geographic Information Systems - Correct Answers ✅Spatial Data Depicts real world by means of a grid of cells with attribute values. Ideal for spatial analysis functions - Correct Answers ✅Raster Data The VAT is a value attribute table. A VAT stores rater data. It tells you the values, counts, and a code. Much more limited attributes in continuous/raster data. - Correct Answers
✅VAT
Digital Orthophotos Quarter Quads; is an image of the earth's surface with no value attributes, it is however georactified - Correct Answers ✅DOQQ Digital Elevation Model; is a 3D CG representation of a terrain's surface - commonly of a planet (e.g. Earth), moon, or asteroid - created from a terrain's elevation data. A "global 1 / 3
GIS Exam #2 Questions with Complete Solutions (Latest 2025) DEM" refers to a discrete global grid. Dumb Raster File - Correct Answers ✅DEM A DSM shows the elevation of the ground and features on the ground, such as buildings and trees. This DSM is a raster layer, which depicts data in a grid where each square, or cell, contains a numeric value. - Correct Answers ✅DSM Discrete points, lines, and polygons • Best suited for representing natural and artificial features that can be individually identified - Correct Answers ✅Vector Data informational database that is attached to the features on a map; also called attribute data - Correct Answers ✅Attribute Table Topology is when geometric properties don't change when forms are bent/stretched or undergo transformations.Topology describes relative spatial relationships - Correct Answers ✅Topology Geoprocessing is a framework and a set of tools for processing and altering geographic data. - Correct Answers ✅Geoprocessing 2 / 3
GIS Exam #2 Questions with Complete Solutions (Latest 2025) The Overlay Layers tool combines two layers into a single
layer using one of three methods: Intersect, Union, or Erase. -
Correct Answers ✅Overlay Can only do this function with polygon layers. Combines all possible layers - Correct Answers ✅Union Can be done with points, lines, and polygons. Combines areas that are in common to two layers - Correct Answers ✅Intersect Creation of a zone around a point, line, or polygon feature.Allows for the analysis of proximity. You can have single buffers around lines (worms) or multiple buffers around points (bullseyes) - Correct Answers ✅Buffer Creates a new layer which includes only those features of the input layer that fall within the area extent of the clip layer - Correct Answers ✅Clip Combines multiple input datasets of the same data type into a single, new output dataset. This tool can combine point, line, or polygon feature classes or tables. Buffers can be dissolved. More of an umbrella term for geoprocessing tool. - Correct Answers ✅Merge
- / 3