ISO 6709:2022 座標による地理的位置の標準表現 | ページ 6

3.1

accuracy

closeness of agreement between a test result or measurement result and the true value

[SOURCE:ISO 3534-2:2006, 3.1.1, modified — Notes to entry have been removed.]

3.2

altitude

height where the chosen reference surface is mean sea level

3.3

compound coordinate reference system

coordinate reference system using at least two independent coordinate reference systems

Note 1 to entry: Coordinate reference systems are independent of each other if coordinate values in one cannot be converted or transformed into coordinate values in the other.

[SOURCE:ISO 19111:2019, 3.1.3]

3.4

coordinate

one of a sequence of numbers designating the position of a point

Note 1 to entry: In a spatial coordinate reference system, the coordinate numbers are qualified by units.

[SOURCE:ISO 19111:2019, 3.1.5]

3.5

coordinate reference system

coordinate system that is related to an object by a datum

Note 1 to entry: Geodetic and vertical datums are referred to as reference frames.

Note 2 to entry: For geodetic and vertical reference frames, the object will be the Earth. In planetary applications, geodetic and vertical reference frames may be applied to other celestial bodies.

[SOURCE:ISO 19111:2019, 3.1.9]

3.6

coordinate set

collection of coordinate tuples referenced to the same coordinate reference system and if that coordinate reference system is dynamic also to the same coordinate epoch

[SOURCE:ISO 19111:2019, 3.1.10]

3.7

coordinate system

set of mathematical rules for specifying how coordinates are to be assigned to points

[SOURCE:ISO 19111:2019, 3.1.11]

3.8

coordinate tuple

tuple composed of coordinates

Note 1 to entry: The number of coordinates in the coordinate tuple equals the dimension of the coordinate system; the order of coordinates in the coordinate tuple is identical to the order of the axes of the coordinate system.

[SOURCE:ISO 19111:2019, 3.1.13]

3.9

datum

reference frame

parameter or set of parameters that realize the position of the origin, the scale, and the orientation of a coordinate system

[SOURCE:ISO 19111:2019, 3.1.15]

3.10

depth

distance of a point from a chosen vertical reference surface downward along a line that is perpendicular to that surface

Note 1 to entry: The line direction may be straight or be dependent on the Earth's gravity field or other physical phenomena.

Note 2 to entry: A depth above the vertical reference surface will have a negative value.

[SOURCE:ISO 19111:2019, 3.1.17]

3.11

ellipsoidal height

geodetic height

h

distance of a point from the reference ellipsoid along the perpendicular from the reference ellipsoid to this point, positive if upwards or outside of the reference ellipsoid

Note 1 to entry: Only used as part of a three-dimensional ellipsoidal coordinate system or as part of a three-dimensional Cartesian coordinate system in a three-dimensional projected coordinate reference system, but never on its own.

[SOURCE:ISO 19111:2019, 3.1.24]

3.12

geographic point location

well defined geographic place described by one coordinate tuple

[SOURCE:ISO 19145:2013, 4.1.11]

3.13

geographic point location representation

syntactic description of a geographic point location in a well known format

[SOURCE:ISO 19145:2013, 4.1.12]

3.14

gravity-related height

H

height that is dependent on the Earth’s gravity field

Note 1 to entry: This refers to, amongst others, orthometric height and Normal height, which are both approximations of the distance of a point above the mean sea level, but also may include Normal-orthometric heights, dynamic heights or geopotential numbers.

Note 2 to entry: The distance from the reference surface may follow a curved line, not necessarily straight, as it is influenced by the direction of gravity.

[SOURCE:ISO 19111:2019, 3.1.37]

3.15

height

distance of a point from a chosen reference surface positive upward along a line perpendicular to that surface

Note 1 to entry: A height below the reference surface will have a negative value.

Note 2 to entry: Generalisation of ellipsoidal height (h) and gravity-related height (H).

[SOURCE:ISO 19111:2019, 3.1.38]

3.16

measurement precision

precision

closeness of agreement between indications or measured quantity values obtained by replicate measurements on the same or similar objects under specified conditions

Note 1 to entry: Measurement precision is usually expressed numerically by measures of imprecision, such as standard deviation, variance, or coefficient of variation under the specified conditions of measurement.

Note 2 to entry: The"specified conditions" can be, for example, repeatability conditions of measurement, intermediate precision conditions of measurement, or reproducibility conditions of measurement (see ISO 5725-1:1994).

Note 3 to entry: Measurement precision is used to define measurement repeatability, intermediate measurement precision, and measurement reproducibility.

Note 4 to entry: Sometimes"measurement precision" is erroneously used to mean measurement accuracy.

[SOURCE:ISO/IEC Guide 99:2007, 2.15]

3.17

metadata

information about a resource

[SOURCE:ISO 19115-1:2014, 4.10]

3.18

resolution (of a coordinate)

unit associated with the least significant digit of a coordinate

Note 1 to entry: Coordinate resolution may have linear or angular units depending on the characteristics of the coordinate system.

3.19

sexagesimal degree

angle represented by a sequence of values in degrees, minutes, and seconds

Note 1 to entry: In the case of latitude or longitude, it may also include a character indicating hemisphere.

3.20

tuple

ordered list of values

Note 1 to entry: The number of values in a tuple is immutable.

[SOURCE:ISO 19136-1:2020, 3.1.60]