Reliability and Precision Tolerance Statement

As a part of the adjustment calculation, and of the distribution, the system analyzes the precision and the reliability. When you distribute a point, the system analyzes and stores the reliability. Reliability is stored separately for position and height.

Reliability attributes in point feature classes

TB_POSITION_RELIABLE—Stores the reliability of the position (easting, northing). The reliability of the position is indicated by the value NA.
TB_HEIGHT_RELIABLE—Stores the reliability of height. The reliability of the height is indicated by the value NH.

Note:

The reliability attribute can either be 1 or 0. In the Global Settings, you specify which value indicates True or False. For example, 1 = True, and 0 = False. See also Global Survey Settings.

In the field code list, you specify Tolerance Statements to set the precision and reliability tolerances for reliable points. See also Field Code Settings for Distribution

Note:

You can only have one Tolerance Statement per field code. However you can define multiple distribution rules for one field code.

You specify the tolerances in the industry model length unit.

If all tolerances are met, the distribution function sets the reliability attributes to true, otherwise to false.

The Tolerance Statement is either a short expression, or you define your own SQL select statement. You can define multiple tolerance statements to distribute the points to several industry models. For example, in the Land industry model, the reliability tolerances are lower than in a Water industry model.

Note:

After the adjustment calculation, when you calculate the reliability indicators, the tolerances are checked. Green light in the Coordinate Precision area, and in Coordinate Reliability area indicate that all tolerances have been met. See also Coordinate Precision and Coordinate Reliability.

Tolerance Statement - Short

The short expression for the Tolerance Statement contains the tolerances explicitly.

Tolerance/<tolerance EMA>/<tolerance EH>/<tolerance NA>/<tolerance NH>

All values are separated by a slash. For example, a point is reliable in position, if EMA < 0.15, and NA < 0.15. The point is reliable in height, if EH < 0.25, and NH < 0.25.

Attention:

You specify the tolerances in the industry model length unit.

Tolerance/0.15/0.25/0.15/0.25

For indicators that you do not want to be checked, set the tolerance = NULL. For example, if you do not want to check for the height reliability.

Tolerance/0.15/NULL/0.15/NULL

Tolerance Statement - SQL Select Statement

Optionally you define your own select statements to set the reliability tolerances. For example, if you want to distinguish between different tolerance zones, such as an inner area with high requirements, and an outer area with lower tolerances.

The tolerance statement must return the following values:

TB_TOLERANCE_ACCURACY_POSITION—Maximum EMA value for points that lie within the position tolerance.
TB_TOLERANCE_ACCURACY_HEIGHT—Maximum EMH value for points that lie within the height tolerance.
TB_TOLERANCE_RELIABILITY_POSITION—Maximum NA value for points that lie within the position tolerance.
TB_TOLERANCE_RELIABILITY_HEIGHT—Maximum NH value for points that lie within the height tolerance.

If you want to set tolerances that are dependent on the position of the point, you use the following placeholders.

for easting: {0}
for northing: {1}
for height: {2}

Example - Select statement to set all maximum values to 0.15.

select 0.15, 0.25, 0.15, 0.25 from dual

Example - Select statement

SELECT
t.ACCURACY_POSITION, t.ACCURACY_HEIGHT, t.RELIABILLITY_POSITION, t.RELIABILITY_HEIGHT 
FROM TOLERANCE t 
WHERE t.LAYER_NAME = 'LFP3' AND t.TOLERANCELEVEL = 
(select tl.ART from Toleranzlevel tl where SDO_RELATE(tl.geom, MDSYS.SDO_GEOMETRY(2001, NULL, MDSYS.SDO_POINT_TYPE({0},{1},NULL), NULL, NULL), 'mask=ANYINTERACT')= 'TRUE'

This select statement uses a table that defines the tolerances for field codes (LAYER_NAME) and tolerance level (TOLERANCELEVEL). The inner select is a spatial intersection to find out the tolerance level of the position. To simplify the select statement, replace the inner select with a static tolerance level.