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Content for  TS 23.032  Word version:  18.2.0

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7 General message format and information elements coding  7.1 Overview  7.2 Type of Shape  7.3 Shape description  7.3.1 Ellipsoid Point  7.3.2 Ellipsoid Point with uncertainty Circle  7.3.3 Ellipsoid Point with uncertainty Ellipse  7.3.3a High Accuracy Ellipsoid point with uncertainty ellipse  7.3.3b High Accuracy Ellipsoid point with scalable uncertainty ellipse  7.3.4 Polygon  7.3.5 Ellipsoid Point with Altitude  7.3.6 Ellipsoid Point with altitude and uncertainty ellipsoid  7.3.6a High Accuracy Ellipsoid point with altitude and uncertainty ellipsoid  7.3.6b High Accuracy Ellipsoid point with altitude and scalable uncertainty ellipsoid  7.3.7 Ellipsoid Arc 
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7  General message format and information elements coding  p. 19

This clause describes a coding method for geographical area descriptions. A geographical area description is coded as a finite bit string. In the figures, the bit string is described by octets from top downward, and in the octet from left to right. Number encoding strings start with the most significant bit.

7.1  Overview  p. 20

A bit string encoding a geographical description shall consist of the following parts:
  • Type of Shape;
  • Shape Description.
Such a bit string is usually part of an information element. The structure of the information element (e.g., element identifier, length) depends on the protocol in which the message containing the description is defined, and is specified in the protocol specification.
This organisation is illustrated in the example shown in Figure 4.
Copy of original 3GPP image for 3GPP TS 23.032, Fig. 4: Example
Figure 4: Example
(⇒ copy of original 3GPP image)
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7.2  Type of Shape  p. 20

The Type of Shape information field identifies the type which is being coded in the Shape Description. The Type of Shape is coded as shown in Table 2a.
Bits
4 3 2 1
0 0 0 0Ellipsoid Point
0 0 0 1Ellipsoid point with uncertainty Circle
0 0 1 1Ellipsoid point with uncertainty Ellipse
0 1 0 1Polygon
1 0 0 0Ellipsoid point with altitude
1 0 0 1Ellipsoid point with altitude and uncertainty Ellipsoid
1 0 1 0Ellipsoid Arc
1 0 1 1High Accuracy Ellipsoid point with uncertainty ellipse
1 1 0 0High Accuracy Ellipsoid point with altitude and uncertainty ellipsoid
1 1 0 1High Accuracy Ellipsoid point with scalable uncertainty ellipse
1 1 1 0High Accuracy Ellipsoid point with altitude and scalable uncertainty ellipsoid
other valuesreserved for future use
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7.3  Shape description  p. 21

The shape description consist of different elements.

7.3.1  Ellipsoid Point  p. 21

The coding of a point is described in Figure 5.
Copy of original 3GPP image for 3GPP TS 23.032, Fig. 5: Shape description of a point
Figure 5: Shape description of a point
(⇒ copy of original 3GPP image)
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S: Sign of latitude
Bit value 0: North
Bit value 1: South
Degrees of latitude
Bit 1 of octet 4 is the low order bit
Degrees of longitude
Bit 1 of octet 7 is the low order bit

7.3.2  Ellipsoid Point with uncertainty Circle  p. 22

Copy of original 3GPP image for 3GPP TS 23.032, Fig. 6: Shape description of an ellipsoid point with uncertainty circle
Figure 6: Shape description of an ellipsoid point with uncertainty circle
(⇒ copy of original 3GPP image)
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7.3.3  Ellipsoid Point with uncertainty Ellipse  p. 23

Copy of original 3GPP image for 3GPP TS 23.032, Fig. 6a: Shape description of an ellipsoid point with uncertainty ellipse
Figure 6a: Shape description of an ellipsoid point with uncertainty ellipse
(⇒ copy of original 3GPP image)
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Orientation of major axis
angle in degrees between the major axis and north
(0 = north, 90 = east, values of 180 and above are not used)

7.3.3a  High Accuracy Ellipsoid point with uncertainty ellipse  p. 24

Copy of original 3GPP image for 3GPP TS 23.032, Fig. 7.3.3a-1: Shape description of a high accuracy ellipsoid point with uncertainty ellipse
Figure 7.3.3a-1: Shape description of a high accuracy ellipsoid point with uncertainty ellipse
(⇒ copy of original 3GPP image)
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High Accuracy Degrees of Latitude:
Bit 8 of octet 2 is the high order bit.
Bit 1 of octet 5 is the low order bit.
High Accuracy Degrees of Longitude:
Bit 8 of octet 6 is the high order bit.
Bit 1 of octet 9 is the low order bit.
Orientation of major axis:
angle in degrees between the major axis and north
(0 = north, 90 = east, values of 180 and above are not used).

7.3.3b  High Accuracy Ellipsoid point with scalable uncertainty ellipse  p. 25

Copy of original 3GPP image for 3GPP TS 23.032, Fig. 7.3.3b-1: Shape description of a high accuracy ellipsoid point with uncertainty ellipse
Figure 7.3.3b-1: Shape description of a high accuracy ellipsoid point with uncertainty ellipse
(⇒ copy of original 3GPP image)
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High Accuracy Degrees of Latitude:
Bit 8 of octet 2 is the high order bit.
Bit 1 of octet 5 is the low order bit.
High Accuracy Degrees of Longitude:
Bit 8 of octet 6 is the high order bit.
Bit 1 of octet 9 is the low order bit.
Orientation of major axis:
angle in degrees between the major axis and north
(0 = north, 90 = east, values of 180 and above are not used).
U: Uncertainty Range
Bit value 0
High Accuracy default uncertainty range used.
Bit value 1
High Accuracy Extended Uncertainty Range used.

7.3.4  Polygon  p. 26

Copy of original 3GPP image for 3GPP TS 23.032, Fig. 7: Shape description of a polygon
Figure 7: Shape description of a polygon
(⇒ copy of original 3GPP image)
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The number of points field encodes in binary on 4 bits the number n of points in the description, and ranges from 3 to 15.

7.3.5  Ellipsoid Point with Altitude  p. 27

The coding of an ellipsoid point with altitude is described in Figure 8.
Copy of original 3GPP image for 3GPP TS 23.032, Fig. 8: Shape description of an ellipsoid point with altitude
Figure 8: Shape description of an ellipsoid point with altitude
(⇒ copy of original 3GPP image)
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D: Direction of Altitude
Bit value 0
Altitude expresses height
Bit value 1
Altitude expresses depth
Altitude
Bit 1 of octet 9 is the low order bit

7.3.6  Ellipsoid Point with altitude and uncertainty ellipsoid  p. 28

Copy of original 3GPP image for 3GPP TS 23.032, Fig. 9: Shape description of an ellipsoid point with altitude and uncertainty ellipsoid
Figure 9: Shape description of an ellipsoid point with altitude and uncertainty ellipsoid
(⇒ copy of original 3GPP image)
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7.3.6a  High Accuracy Ellipsoid point with altitude and uncertainty ellipsoid  p. 29

Copy of original 3GPP image for 3GPP TS 23.032, Fig. 7.3.6a-1: Shape description of an High Accuracy Ellipsoid point with altitude and uncertainty ellipsoid
Figure 7.3.6a-1: Shape description of an High Accuracy Ellipsoid point with altitude and uncertainty ellipsoid
(⇒ copy of original 3GPP image)
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High Accuracy Degrees of Latitude:
Bit 8 of octet 2 is the high order bit.
Bit 1 of octet 5 is the low order bit.
High Accuracy Degrees of Longitude:
Bit 8 of octet 6 is the high order bit.
Bit 1 of octet 9 is the low order bit.
High Accuracy Altitude:
Bit 6 of octet 10 is the high order bit.
Bit 1 of octet 12 is the low order bit.
Orientation of major axis:
angle in degrees between the major axis and north
(0 = north, 90 = east, values of 180 and above are not used).
Up

7.3.6b  High Accuracy Ellipsoid point with altitude and scalable uncertainty ellipsoid  p. 30

Copy of original 3GPP image for 3GPP TS 23.032, Fig. 7.3.6b-1: Shape description of a High Accuracy Ellipsoid point with altitude and uncertainty ellipsoid
Figure 7.3.6b-1: Shape description of a High Accuracy Ellipsoid point with altitude and uncertainty ellipsoid
(⇒ copy of original 3GPP image)
Up
High Accuracy Degrees of Latitude:
Bit 8 of octet 2 is the high order bit.
Bit 1 of octet 5 is the low order bit.
High Accuracy Degrees of Longitude:
Bit 8 of octet 6 is the high order bit.
Bit 1 of octet 9 is the low order bit.
High Accuracy Altitude:
Bit 6 of octet 10 is the high order bit.
Bit 1 of octet 12 is the low order bit.
Orientation of major axis:
angle in degrees between the major axis and north
(0 = north, 90 = east, values of 180 and above are not used).
HU: Horizontal Uncertainty Range
Bit value 0
High Accuracy default uncertainty range used.
Bit value 1
High Accuracy Extended Uncertainty Range used.
VU: Vertical Uncertainty Range
Bit value 0
High Accuracy default uncertainty range used.
Bit value 1
High Accuracy Extended Uncertainty Range used.
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7.3.7  Ellipsoid Arc  p. 31

Copy of original 3GPP image for 3GPP TS 23.032, Fig. 10: Shape description of an Ellipsoid arc
Figure 10: Shape description of an Ellipsoid arc
(⇒ copy of original 3GPP image)
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Inner radius:
Bit 8 of octet 8 is the high order bit.
Bit 1 of octet 9 is the low order bit.

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