Mixed Deck — All GISP Topics Flashcards

Who is the leading company for GIS business applications?

Answer: ESRI

ESRI is the leading company for GIS business applications. They have established themselves as a global leader in the field of Geographic Information System (GIS) technology. ESRI offers a wide range of GIS software and solutions that are used by various industries and organizations worldwide. Their products are known for their advanced capabilities, user-friendly interfaces, and comprehensive data analysis tools. ESRI's dominance in the GIS market, along with their continuous innovation and commitment to customer satisfaction, has solidified their position as the leading company in this field.

A GIS analyst is tasked with creating a map for a country that is wide in the east-west direction and narrow in the north-south direction, such as Russia or the United States. To minimize distortion of area for a thematic map, which map projection family would be the most appropriate choice?

Answer: Conic

Conic projections are well-suited for mid-latitude areas with a greater east-west than north-south extent. They are generated by projecting a spherical surface onto a cone, which can then be unrolled into a flat map. This method effectively minimizes distortion along the standard parallels, making it ideal for mapping large countries like the United States or Russia.

Which of the following spatial interpolation methods is considered an 'exact' interpolator, meaning the resulting surface passes directly through all the input sample points, and calculates unknown values based on a weighted average where the influence of a sample point diminishes with distance?

Answer: Inverse Distance Weighting (IDW)

Inverse Distance Weighting (IDW) is a deterministic and exact interpolator. It assumes that the influence of a sample point decreases with distance. Because a sample point has a distance of zero from itself, it receives all the weight in the calculation, ensuring the interpolated surface honors the known data points precisely.

An analyst is cleaning a street centerline file and discovers that many road segments that should connect at intersections have small gaps between their endpoints. This type of topological error, where a line falls short of connecting to another line, is known as a(n):

Answer: Undershoot or Dangle

An undershoot, also commonly referred to as a dangle or dangling node, is a topological error where a line segment fails to connect to the line segment it should intersect, leaving a gap. An overshoot occurs when a line extends beyond the feature it should connect to.

A local government agency has historical parcel data created using the NAD27 datum and new subdivision data collected using GPS, which references the WGS84 datum. When these datasets are overlaid in a GIS, a noticeable and consistent shift is observed between the old and new parcels. What is the most likely cause of this discrepancy?

Answer: The use of different geodetic datums (NAD27 and WGS84) which have different origins and spheroids.

Geodetic datums define the reference frame for measuring locations on Earth. NAD27 is a local datum centered in North America, while WGS84 is a global, Earth-centered (geocentric) datum. Because they use different spheroids and origin points, coordinates for the same location will differ between them. Overlying data from different datums without a proper datum transformation will result in a systematic spatial shift.

What does Dilution of Precision (DOP) measure in GPS surveys?

Answer: The geometric quality of available satellite configuration affecting positional accuracy

DOP quantifies how satellite geometry affects positional accuracy — a low DOP value (closer to 1) indicates favorable satellite spread and more precise positioning.

Which agile project management framework uses fixed-length iterations called sprints, typically lasting 2–4 weeks, and is increasingly applied to GIS software development?

Answer: Scrum

Scrum is an agile framework that organizes work into time-boxed sprints, enabling iterative delivery and continuous improvement in software and GIS development projects.

What is the minimum number of GPS satellites required to calculate a 3D position fix (latitude, longitude, and elevation)?

Answer: 4

A minimum of four satellites is required for a 3D GPS fix — three to solve for the three position coordinates and a fourth to eliminate clock error in the receiver.

Which technique allows a GIS technician to collect GPS data along a linear feature such as a trail or road centerline?

Answer: Track logging

Track logging continuously records GPS positions at set time or distance intervals as the receiver moves, creating a series of points that define a linear or areal feature's path.

Which cost estimation technique uses historical data from analogous projects to estimate the cost of a new GIS project?

Answer: Analogous estimating

Analogous estimating uses actual costs from previous similar projects as the basis for estimating the current project's cost.

GIS deals with which kind of data

Answer: Spatial data

Geographic Information Systems (GIS) are designed to capture, store, manipulate, analyze, manage, and present spatial or geographic data.

The Kappa coefficient in accuracy assessment ranges from 0 to 1; a value of 0.85 indicates:

Answer: Strong agreement between the classification and reference data

A Kappa coefficient of 0.85 indicates strong agreement (typically interpreted as excellent), meaning the classification is substantially better than a random assignment.

In a field data collection plan for a large-area utility inventory, which data model best supports collecting lines, points, and related attributes with topological relationships enforced?

Answer: Geodatabase feature dataset with a geometric network or utility network

A geodatabase feature dataset with a geometric or utility network enforces topology, connectivity, and attribute domains, making it the appropriate model for utility inventory data requiring relational integrity.

In a typical three-tier enterprise GIS architecture, which component is primarily responsible for handling client requests, executing spatial analysis, and managing business logic before interacting with the database?

Answer: The Application Tier (GIS Server)

The Application Tier, often embodied by a GIS server (like ArcGIS Server), acts as the middle layer. It receives requests from the Presentation Tier (client applications), processes them by applying business logic and running geoprocessing tasks, and then queries the Data Tier (database) for the necessary information before sending a response back to the client. [2, 12] This architecture separates the user interface from the data storage, allowing for more scalable and manageable systems.

According to the GIS Certification Institute (GISCI) Code of Ethics, which of the following is a fundamental obligation a GIS professional has to the profession and their colleagues?

Answer: To accurately represent their own qualifications, skills, and experience.

A core tenet of professional ethics is honesty. The GISCI Code of Ethics and associated Rules of Conduct explicitly state that professionals must not misrepresent their qualifications, education, or experience, ensuring that employers, clients, and colleagues have a truthful understanding of their capabilities.

A crime analyst is studying the spatial distribution of burglaries and wants to determine if the incidents, when considering their locations and attributes (e.g., value of stolen goods), are statistically clustered, dispersed, or randomly distributed across the entire city. Which statistical measure is specifically designed to evaluate this type of global spatial autocorrelation?

Answer: Moran's I

Moran's I is a global statistic that measures spatial autocorrelation. It produces a single value that indicates whether the overall pattern of feature values is clustered, dispersed, or random across the study area. Getis-Ord Gi* is a local statistic used to identify the location of specific hot spots and cold spots, not to describe the overall global pattern.

A GIS manager asks a junior analyst to perform a complex geostatistical analysis for a high-stakes environmental impact assessment. The analyst has only a theoretical understanding of the required method and has never applied it before. What is the analyst's most professionally responsible course of action?

Answer: Inform the manager of their limited experience with the specific method and request training or collaboration with a more senior expert.

The GISCI Rules of Conduct state that professionals shall only undertake services when qualified by education or experience. The most responsible action is to be honest about one's limitations, especially when the results have significant consequences. This protects the employer from flawed analysis and demonstrates professional integrity.

What is the primary advantage of hyperspectral sensors over multispectral sensors?

Answer: Hundreds of narrow contiguous spectral bands enabling detailed material identification

Hyperspectral sensors capture hundreds of narrow, contiguous spectral bands, allowing identification of specific materials and chemicals by their unique spectral signatures.

Which of the following SQL queries would correctly select all cities from a 'cities' table that have a population greater than 1,000,000 and return only the 'city_name' and 'state_name' columns?

Answer: SELECT city_name, state_name FROM cities WHERE population > 1000000;

The correct SQL syntax involves three main clauses: `SELECT` specifies the columns to be returned (`city_name, state_name`), `FROM` specifies the table (`cities`), and `WHERE` filters the rows based on a condition (`population > 1000000`). The other options use incorrect syntax or clauses (`SELECT *` returns all columns, `HAVING` is used with aggregate functions, and `LIST` is not a standard SQL command).

A GIS project manager needs to identify all parties who may affect or be affected by the project. This process is known as:

Answer: Stakeholder identification

Stakeholder identification is the process of finding all individuals and organizations whose interests may affect or be affected by the project.