GISP - Geographic Information Systems Professional Geospatial Data Fundamentals Questions and Answers

Question 1

A GIS analyst is working on a project that requires modeling continuous surface data, such as elevation and temperature gradients. Which geospatial data model would be the most appropriate and efficient for this task?

Accepted Answer

Raster data model

Answer

The raster data model is best suited for representing continuous surfaces. It uses a grid of cells (pixels) where each cell contains a value representing the characteristic of that location, such as elevation or temperature. The vector model, which uses points, lines, and polygons, is better for discrete features with clear boundaries.

Question 2

A cartographer is creating a map of the continental United States for a textbook. The primary goal is to ensure that the relative sizes of the states are accurately represented for demographic comparisons. Which map projection property should be prioritized?

Accepted Answer

Equal-area

Answer

An equal-area (or equivalent) projection preserves the area of displayed features. This is crucial when the map's purpose is to compare sizes or densities, such as population density across states. Conformal projections preserve local shape and angles, while equidistant projections preserve distance from certain points, and azimuthal projections preserve direction from a central point.

Question 3

Which of the following best describes the primary difference between a geoid and an ellipsoid in geodesy?

Accepted Answer

The geoid represents the true, irregular shape of the Earth based on its gravity field (approximating mean sea level), while the ellipsoid is a smooth, mathematically defined approximation of the Earth.

Answer

The geoid is the equipotential surface of the Earth's gravity field that best fits, in a least squares sense, global mean sea level. It is an irregular, complex surface. The ellipsoid is a simplified, mathematically defined reference surface that is smooth and approximates the geoid. It is used as the reference for horizontal coordinates in most datums.

Question 4

A GIS manager is establishing data quality control procedures for a new parcel dataset. To ensure data integrity, they want to prevent any two parcels from overlapping and ensure there are no empty spaces between adjacent parcels. Which GIS concept directly addresses these requirements?

Accepted Answer

Topological Rules

Answer

Topological rules define the spatial relationships between features. Rules like 'Must Not Overlap' and 'Must Not Have Gaps' are specifically designed to maintain the logical consistency and integrity of datasets like land parcels or administrative boundaries. These rules ensure that adjacent polygons share a common boundary without overlapping or leaving voids.

Question 5

When documenting a newly acquired geospatial dataset, a GIS professional needs to create metadata. They are working for a US federal agency that has recently updated its standards to align with international practices. Which metadata standard are they most likely required to use?

Accepted Answer

ISO 19115: Geographic Information – Metadata

Answer

While the FGDC's Content Standard for Digital Geospatial Metadata (CSDGM) was the primary standard for US federal agencies for many years, the FGDC has endorsed and encouraged the transition to the ISO 19115 standard to better align with international practices. ISO 19115 is designed to be more flexible and robust for modern data documentation needs.

GISP - Geographic Information Systems Professional Practice Test

GISP - Geographic Information Systems Professional Practice Test

GISP - Geographic Information Systems Professional Geospatial Data Fundamentals Questions and Answers