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The Open Location Code (OLC) system was developed at Google's London engineering office.
Answer: False
Explanation: The source material indicates that the Open Location Code (OLC) system was developed at Google's Zurich engineering office, not its London office.
What is the primary purpose of the Open Location Code (OLC) system?
Answer: To provide a geocode system based on a grid for identifying any area on Earth.
Explanation: The primary objective of the Open Location Code (OLC) system is to establish a universal geocode system utilizing a grid structure to identify any location on Earth, offering a more user-friendly alternative to traditional coordinates.
Which of the following is the common name for the location codes generated by the Open Location Code system?
Answer: Plus Codes
Explanation: The location codes generated by the Open Location Code (OLC) system are commonly known and referred to as Plus Codes.
What is the purpose of the 'Navbox' section titled 'Geocode systems' mentioned in the context?
Answer: To provide a list of different geocoding systems for navigation.
Explanation: The 'Navbox' section titled 'Geocode systems' functions as a navigational resource, presenting a categorized compilation of diverse geocoding systems for reference.
The Plus Code character set includes all vowels (A, E, I, O, U) to make codes more memorable.
Answer: False
Explanation: The Plus Code character set explicitly excludes vowels (A, E, I, O, U) and other easily confused characters to prevent accidental word formation and reduce ambiguity.
The Open Location Code system is based on the WGS72 coordinate system.
Answer: False
Explanation: The Open Location Code system is founded upon the WGS84 (World Geodetic System 1984) coordinate standard, not WGS72.
The OLC system initially divides the Earth into large blocks of 10 by 10 degrees before further subdivision.
Answer: False
Explanation: The initial division of the Earth's surface within the OLC system utilizes large blocks of 20 by 20 degrees, not 10 by 10 degrees.
The Plus Code system avoids easily confused characters like 'I', 'L', '0', 'O' to reduce errors.
Answer: True
Explanation: To mitigate errors, the Plus Code character set deliberately excludes characters that are easily confused, such as 'I', 'L', '0', and 'O', alongside vowels.
Plus Codes utilize a base-10 encoding system, similar to standard decimal numbers.
Answer: False
Explanation: Plus Codes employ a base-20 encoding system, not a base-10 system similar to standard decimal numbers.
The OLC system uses offsets from the North Pole and the Prime Meridian for its base-20 encoding.
Answer: False
Explanation: The OLC system utilizes offsets from the South Pole and the antimeridian for its base-20 encoding, not from the North Pole and the Prime Meridian.
The character mapping table is used to convert between standard base-10 digits and the specific alphanumeric characters used in Plus Codes.
Answer: True
Explanation: The character mapping table is indeed instrumental in translating between the numerical base-20 digits (0-19) and their corresponding alphanumeric characters employed in Plus Codes, facilitating both encoding and decoding processes.
After the initial four stages of 20x20 subdivision, the OLC system switches to a 5x4 grid for further subdivision.
Answer: False
Explanation: Following the initial four stages of 20x20 subdivision, the OLC system transitions to a 4x5 grid for subsequent subdivisions, not a 5x4 grid.
The 'BASE20 Formula' is a method for converting Plus Codes back into degrees of latitude and longitude.
Answer: False
Explanation: The 'BASE20 Formula' is utilized for deriving Plus Codes from geographical degrees, not for converting Plus Codes back into latitude and longitude.
The first two characters of a Plus Code, like '6P', represent the initial 20x20 degree grid block.
Answer: True
Explanation: The initial two characters of a Plus Code, such as '6P', indeed denote the first 20°x20° grid block, derived from the latitude and longitude offsets.
Plus Codes are case-sensitive, making them easier to exchange verbally.
Answer: False
Explanation: Plus Codes are intentionally designed to be case-insensitive, which enhances their usability for verbal exchange by eliminating the need to distinguish between uppercase and lowercase letters.
The OLC system prevents generated codes from forming words by including a wide range of special characters.
Answer: False
Explanation: The OLC system prevents word formation by excluding vowels and easily confused characters from its character set, not by including a wide range of special characters.
Why does the Plus Code character set exclude vowels?
Answer: To prevent codes from accidentally spelling out words and reduce confusion.
Explanation: Vowels are excluded from the Plus Code character set as a deliberate strategy to prevent the accidental formation of words and to minimize confusion.
The Open Location Code system is based on which standard coordinate system?
Answer: WGS84
Explanation: The Open Location Code system is fundamentally based on the WGS84 (World Geodetic System 1984) standard for its latitude and longitude coordinates.
How does the OLC system initially divide the Earth's surface?
Answer: Into 20x20 degree blocks, then subdivided.
Explanation: The OLC system initiates the division of the Earth's surface into large blocks measuring 20 by 20 degrees, which are subsequently subdivided.
How does the Plus Code system reduce the chance of codes accidentally forming words?
Answer: By excluding vowels and easily confused characters.
Explanation: The Plus Code system mitigates the formation of accidental words by excluding vowels and characters prone to confusion from its character set.
What base system is used for encoding Plus Codes?
Answer: Base-20
Explanation: The encoding system employed by Plus Codes is base-20.
The OLC system uses offsets from which two reference points for its base-20 encoding?
Answer: South Pole and Antimeridian
Explanation: The OLC system employs offsets from the South Pole and the antimeridian as reference points for its base-20 encoding.
How does the OLC system ensure that codes for nearby locations share similarities?
Answer: By employing a hierarchical grid structure.
Explanation: The OLC system ensures that codes for nearby locations share similarities by utilizing a hierarchical grid structure, resulting in common prefixes for geographically proximate coordinates, reflecting their spatial relationship.
How does the OLC system handle coordinates near the antimeridian (-180° longitude)?
Answer: It uses offsets from the antimeridian for encoding.
Explanation: Coordinates near the antimeridian are handled by the OLC system through the use of offsets from this reference line during the encoding process.
Which of the following is NOT a characteristic of the Plus Code character set mentioned in the source?
Answer: Is case-sensitive.
Explanation: The Plus Code character set excludes vowels and easily confused characters, and uses a base-20 system; however, it is explicitly not case-sensitive.
What is the functional difference between a 'Base 20 digit' and a 'Code digit' in the mapping table?
Answer: The Base 20 digit is the numerical value (0-19), while the Code digit is the corresponding alphanumeric character used in the Plus Code.
Explanation: The 'Base 20 digit' denotes the numerical value (0-19) within the base-20 system, whereas the 'Code digit' represents the specific alphanumeric character assigned to that numerical value in the Plus Code, such as 'A' corresponding to the base-20 digit '10'.
The '+' symbol in a Plus Code separates the locality name from the specific grid coordinates.
Answer: False
Explanation: The '+' symbol in a Plus Code functions as a delimiter, separating the main code segment (defining a larger area) from the finer grid divisions, rather than separating a locality name from coordinates.
Each additional character added to a Plus Code increases its location precision.
Answer: True
Explanation: The length of a Plus Code directly correlates with its precision; each additional character appended refines the location to a progressively smaller area.
A 6-digit Plus Code represents an area roughly the size of a large city block.
Answer: False
Explanation: A 6-digit Plus Code corresponds to an area of approximately 5.6 square kilometers, which is considerably larger than a typical city block.
An 8-digit Plus Code provides a precision of approximately 280 millimeters.
Answer: False
Explanation: An 8-digit Plus Code offers a precision of approximately 280 meters, not millimeters. This level of accuracy is suitable for identifying specific buildings or small areas within a city block.
A 10-digit Plus Code narrows down the location to an area of approximately 14 meters.
Answer: True
Explanation: A 10-digit Plus Code indeed narrows the location identification to an area of approximately 14 meters, suitable for pinpointing specific entrances or small land plots.
An 11-digit Plus Code offers precision down to the scale of square centimeters.
Answer: False
Explanation: An 11-digit Plus Code provides precision to approximately 3.5 meters by 2.8 meters, which is more akin to the scale of a doorway or specific spot, not square centimeters.
The smallest grid size mentioned for Plus Codes is a 15-digit code, representing an area of about 14 millimeters by 4 millimeters.
Answer: True
Explanation: The specification details a 15-digit Plus Code as providing the highest precision, defining an area of approximately 14 millimeters by 4 millimeters, suitable for identifying very small objects.
A 12-digit Plus Code provides precision sufficient to pinpoint specific points like a particular statue.
Answer: True
Explanation: A 12-digit Plus Code offers a precision of approximately 87 centimeters, which is indeed sufficient to pinpoint specific points such as a particular statue or landmark.
The OLC system accommodates areas larger than an 8-digit code by adding more characters after the '+'.
Answer: False
Explanation: The OLC system accommodates larger areas by padding with zeros before the '+' symbol, rather than by adding more characters after it.
The 'Real size' row in the table shows the angular dimensions (degrees, minutes) of the grid blocks.
Answer: False
Explanation: The 'Real size' row in the table provides the physical dimensions (in kilometers, meters, etc.) of the grid blocks, translating the angular measurements into practical, real-world scales.
A 15-digit Plus Code provides precision down to the scale of small objects, approximately 14mm x 4mm.
Answer: True
Explanation: A 15-digit Plus Code indeed provides the highest level of precision detailed, defining an area of approximately 14mm x 4mm, suitable for identifying small objects.
What is the function of the '+' symbol in a Plus Code like 6PH57VP3+PR6?
Answer: It acts as a delimiter, separating the main part of the code from finer grid divisions.
Explanation: The '+' symbol in a Plus Code serves as a delimiter, demarcating the primary code segment (representing a larger area) from the subsequent characters that denote finer grid divisions.
What is the approximate area represented by a 6-digit Plus Code?
Answer: Approximately 5.6 square kilometers
Explanation: A 6-digit Plus Code encompasses an area of approximately 5.6 square kilometers, typically sufficient for identifying a neighborhood or city district.
An 8-digit Plus Code provides a location precision of roughly:
Answer: 280 meters
Explanation: An 8-digit Plus Code offers a location precision of approximately 280 meters, adequate for identifying specific buildings or small areas.
Which Plus Code length offers precision suitable for identifying specific entrances or small plots of land?
Answer: 10-digit
Explanation: A 10-digit Plus Code provides precision to approximately 14 meters, making it suitable for identifying specific entrances or small plots of land.
What is the precision of an 11-digit Plus Code?
Answer: Approximately 3.5m x 2.8m
Explanation: An 11-digit Plus Code provides a precision of approximately 3.5 meters by 2.8 meters, sufficient for identifying specific points like a doorway.
The highest level of precision mentioned for Plus Codes, approximately 14mm x 4mm, corresponds to which code length?
Answer: 15-digit
Explanation: The highest precision detailed, approximately 14mm x 4mm, corresponds to a 15-digit Plus Code.
A 12-digit Plus Code provides precision down to approximately what measurement?
Answer: 87 centimeters
Explanation: A 12-digit Plus Code offers precision down to approximately 87 centimeters.
How does the precision of a Plus Code change as more digits are added?
Answer: Precision increases significantly with more digits.
Explanation: As more digits are appended to a Plus Code, its location precision increases substantially, refining the identification to progressively smaller geographical areas.
What is the approximate precision of a 14-digit Plus Code?
Answer: 5 centimeters
Explanation: A 14-digit Plus Code offers an approximate precision of 5 centimeters.
Plus Codes are designed to be less user-friendly than standard latitude and longitude coordinates.
Answer: False
Explanation: The premise is incorrect; Plus Codes are intentionally designed to be more user-friendly than standard latitude and longitude coordinates, offering advantages such as shorter codes and offline encoding/decoding capabilities.
Google Maps began supporting Plus Codes in its search engine in August 2015.
Answer: True
Explanation: The integration of Plus Codes into Google Maps' search engine commenced in August 2015, as documented in the provided materials.
Plus Codes are primarily useful in densely populated urban areas with well-established street naming conventions.
Answer: False
Explanation: Plus Codes are most beneficial in areas lacking formal addressing systems, such as those with unnamed streets or informal settlements, rather than in densely populated urban areas with established conventions.
The nonprofit Shelter Associates used Plus Codes to manage immunization programs in Somalia.
Answer: False
Explanation: The source indicates that Shelter Associates utilized Plus Codes in Pune, India, for service delivery within a slum. The International Rescue Committee, not Shelter Associates, uses Plus Codes for immunization programs in Somalia.
Shortened Plus Codes are always unambiguous, even without a specified locality.
Answer: False
Explanation: Shortened Plus Codes are not always unambiguous; they necessitate a specified locality context for precise decoding and typically require disambiguation within a radius of approximately 40 kilometers.
The International Rescue Committee uses Plus Codes in Somalia for managing immunization programs.
Answer: True
Explanation: The source confirms that the International Rescue Committee utilizes Plus Codes in Somalia for the management of immunization and family planning programs.
Compared to traditional geographic coordinates (latitude and longitude), what is a key advantage of Plus Codes?
Answer: They are designed to be more user-friendly and function like street addresses.
Explanation: A primary advantage of Plus Codes over traditional geographic coordinates is their enhanced user-friendliness, enabling them to function analogously to street addresses and be easily shortened when paired with a locality.
When did Google Maps begin integrating support for Plus Codes?
Answer: August 2015
Explanation: Google Maps commenced its integration of support for Plus Codes within its search engine in August 2015.
In which type of area are Plus Codes particularly beneficial?
Answer: Areas lacking formal addressing systems, like unnamed streets or slums.
Explanation: Plus Codes are particularly beneficial in regions lacking formal addressing systems, such as areas with unnamed streets or informal settlements.
Which organization used Plus Codes to help deliver services within a slum in Pune, India?
Answer: Shelter Associates
Explanation: The nonprofit organization Shelter Associates utilized Plus Codes to facilitate service delivery within a slum area in Pune, India.
What is a significant limitation of using shortened Plus Codes?
Answer: They require a specific locality context for accurate decoding.
Explanation: A significant limitation of shortened Plus Codes is their dependence on a specific locality context for unambiguous and precise decoding.
What is the primary advantage of Plus Codes over traditional addresses in certain areas?
Answer: They are easier to use in areas lacking formal street names and numbers.
Explanation: The primary advantage of Plus Codes over traditional addresses in certain regions lies in their ease of use within areas that lack formal street names and numbering systems.
The algorithm for Open Location Codes is available under which license?
Answer: Apache License 2.0
Explanation: The algorithm underpinning Open Location Codes is made available under the terms of the Apache License 2.0.