GPS Fundamentals
The 3 primary segments of the Global Positioning System are the...?
What are the Space, Control, and User segments?
To determine a 3-D position using GPS, you need a minimum of ____ satellites
What is four (4) satellites?
When importing GPS data into a GIS project, one must...
What is have a defined coordinate system?
The unique characteristics of GIS that distinguishes it from other information technologies is the ability to...
What is analyze spatial data?
In planning a GPS survey, the most important factor you should consider is:
What is the accuracy requirement for the job?
GPS heights are referenced to...
What is the ellipsoid?
This error was intentionally introduced by the Department of Defense to degrade civilian GPS accuracy, but was permanently turned off in the year 2000...
What is Selective Availability (SA)?
GPS is based on this reference ellipsoid...
What is WGS 84?
The primary structural components of a Geographic Information System (GIS) are:
What are people, software, data, procedures, and hardware?
When contracting data collection that could involve GPS, the most important items you should include in the scope of work are...
What is specify end results of the data collection (i.e. type of features, standard to meet, accuracy desired)?
GPS determines your location by measuring this key metric of radio signals as they travel from satellites to your receiver
What is travel time? or What is time of arrival / signal speed?
To obtain centimeter-level accuracy, the GPS positioning method most likely to be used is:
What is carrier differential GPS (DGPS)?
Metadata refers to:
What is data about data?
What is the application that allows you to explore, visualize, and analyze data; create 2D maps and 3D scenes; and share your work to your ArcGIS Online and ArcGIS Enterprise portal?
ArcGIS Pro
A GIS implementation plan is a wise investment of time and should always include...
What is a commitment to an agreed upon process, work schedule, and adherence to USACE geospatial policy?
In real-time code phase DGPS positioning, the reference station is set up over what?
What is a known point with known Lat, Long, Height?
What is the major source in GPS positioning (user segment) that is not eliminated/reduced by differencing?
What is multipath errors?
The Spatial Data Standards for Facilities, Infrastructure, and Environment (SDSFIE) logical data model LDM consists of these elements (5):
What are feature types, feature geometries, attributes, enumeration/domain values, and associations/relationships?
Two common GIS data collection methods are:
What are Open Data Sites and GPS?
A park ranger's GPS is plotting points 30 meters away from the boundary line on an old 1950s map. This mismatch is likely caused because the map and the GPS are using two different horizontal versions of these?
What are Datums? (Specifically, the mismatch between NAD 27 and NAD 83/WGS 84)
To obtain 1 meter accuracy, the GPS positioning method most likely to be used is...
What is code differential GPS?
The PDOP is a function of the satellites’ what?
What is geometry?
This lumpy, gravity-based model of the Earth is used by surveyors to approximate mean sea level...
What is the Geoid?
The three basic geometry types (vector) used to represent features in GIS are....
What are points, lines, and polygons?
When a private landowner disputes a USACE boundary line, a _______ (conducted by a licensed professional) is the way to define the physical boundary?
What is a boundary survey by a Professional Land Surveyor (PLS)?