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This chapter needs update ding, the lists are not complete |
A.1 GeoDatum
DELFT-FEWS may use a number of national coordinate system as geo-datum. These are referenced by all configurations requiring a definition of geodatum.
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+ WGS 1984 (Geographic projection; longitude-latitude)
+ Ordnance Survey Great Britain 1936 (Great Britain)
+ Rijks Driehoekstelsel (The Netherlands)
+ Gauss Krueger Austria M34 (Austria)
+ Gauss Krueger Meridian3 (Germany)
+ TWD 1967 (Taiwan)
A.2 Time Zones
DELFT-FEWS supports a number of time zones:
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+ GMT Greenwich Mean Time (UTC+0.00)
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+ CET Central European Time (UTC+1.00)
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+ EET Eastern European Time (UTC+2.00)
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+ WET Western European Time (UTC+1.00)
A.3 Units
DELFT-FEWS supports a list of units. Most of these are SI untisunits.
Unit | Description |
m | Metres |
mm | Millimetres |
m3/s | Cubic meters per second |
oC | Degrees Centigraed |
mm/hr | Millimetres per hour |
% | Percentage |
g |
|
s |
|
degrees | Degrees (directional) |
Bft | Beaufort |
m/s | Metres per second |
- | Dimensionless |
W/m2 | Watts per metre squared |
A.4 Data quality flags
Quality flags are constructed on a philosophy of two qualifiers. The first describes the origin of the data and the second the quality.
Possible origins of data are:
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+ Original: This entails the data value is the original value. It has not been amended by DELFT-FEWS
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+ Completed: This entails the original value was missing and was replaced by a non-missing value.
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+ Corrected: This entails the original value was replaced with another non-missing value.
Possible qualifiers are:
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+ Reliable: Data is reliable and valid
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+ Doubtful: The validity of the data value is uncertain
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+ Unreliable: The data value is unreliable and cannot be used.
Following this specification, the table below gives an overview of quality flag enumerations
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- No difference is made between historic and forecast data. This is not considered a quality flag. The data model of DELFT-FEWS is constructed such that this difference is inherent to the time series type definition.
A.5 Synchronisation Levels
To allow optimisation of Data flows in DELFT-FEWS when set-up in a distributed environment, synchronisation levels can be defined. These synchronisation levels are integers. There is no requirement on these integers, and when required additional synchronisation levels can be added to further refine the synchronisation process. The current convention is;
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- synchLevel = 9; used to identify temporary time series not requiring synchronisation. When a