GPKG Time Series Format Specification
The below sections describe the TUFLOW GPKG time series format specification. The specification is build ontop of the GPKG v1.2 Specification with two additional required tables. The additional tables and details of the GIS layers are described below with examples. The examples are based a the 1D/2D linked TUFLOW-SWMM example model based on TUFLOW's tutorial model 6 - M06_5m_003.tcf.
TUFLOW Time Series Version
An additional table called TUFLOW_timeseries_version should be present in the GPKG. This table contains the version number of the TUFLOW GPKG time series format and should be set to 1.0.0. The table should have the following columns:
| Column Name | Type | Description |
|---|---|---|
| Version | TEXT | Major.Minor.Patch version number |
Time Series Info
An additional table called Timeseries_info should be present in the GPKG. The purpose of this table is to list the available result types and relevant information for each type. The table should have the following columns:
| Column Name | Type | Description |
|---|---|---|
| row | INTEGER | Primary key |
| Table_name | TEXT | Reference to the GIS table that the result sits within |
| Count | INTEGER | Number of unique elements |
| Reference_time | TEXT | Reference time in the form of: [UNITS] since YYYY-MM-DD hh:mm:ss
|
| dt | FLOAT | Output timestep (units defined in Reference_time)
|
| Column_name | TEXT | Name of the column in the GIS table containing the result |
| Series_name | TEXT | Name of the result type |
| Series_units | TEXT | Result type units |
Example Timeseries_info
| Row | Table_name | Count | Reference_time | dt | Column_name | Series_name | Series_units |
|---|---|---|---|---|---|---|---|
| 1 | M06_5m_003_swmm_ts_P | 22 | hours since 2020-01-01 00:00:00 | 1.0 | Depth | Depth | m |
| 2 | M06_5m_003_swmm_ts_P | 22 | hours since 2020-01-01 00:00:00 | 1.0 | Water Level | Water Level | m |
| 3 | M06_5m_003_swmm_ts_P | 22 | hours since 2020-01-01 00:00:00 | 1.0 | Storage Volume | Storage Volume | m3 |
| 4 | M06_5m_003_swmm_ts_L | 18 | hours since 2020-01-01 00:00:00 | 1.0 | Flow | Flow | cms |
| 5 | M06_5m_003_swmm_ts_L | 18 | hours since 2020-01-01 00:00:00 | 1.0 | Velocity | Velocity | m/s |
GIS Layers
The results are stored in GPKG layers, typically between 1 - 3 layers are stored in the result file depending on the output (one for point results, one for line results, one for polygon results). There is no requirement against storing results from multiple model runs in a single GPKG, this is just not typically how outputs are written.
The column names of the GPKG layers should follow the convention below:
| Column Name | Type | Description |
|---|---|---|
| fid | INTEGER | Primary key |
| geometry | GEOMETRY | GeoPackage Geometry |
| ID | TEXT | Element ID (e.g. Pipe1) |
| Type | TEXT | Element Type (e.g. CONDUIT) |
| Source | TEXT | Result Source (e.g. SWMM) |
| TimeId | INTEGER | Unique id for each timestep |
| Time_relative | FLOAT | Output relative time (reference time and units in Timeseries_info)
|
| Datetime | DATETIME | Output time in datetime |
...[column for each result type for that given geometry type as listed in Timeseries_info- examples below]
| ||
| Flow | FLOAT | Result flow |
| Velocity | FLOAT | Result velocity |
The GIS layer should contain a feature for each applicable element and timestep i.e. the same pipe may be referenced 10 times if there are 10 output timesteps. The order should be ascending based on the output time.
Example M06_5m_003_swmm_ts_L with three output timesteps and three culverts
| fid | geometry | ID | Type | Source | TimeId | Time_relative | Datetime | Flow | Velocity |
|---|---|---|---|---|---|---|---|---|---|
| 1 | LINESTRING | FC01.1_R | CONDUITS | SWMM | 1 | 1.0 | 2020-01-01T01:00:00Z | 52.313579 | 5.3814558 |
| 2 | LINESTRING | FC01.2_R | CONDUITS | SWMM | 1 | 1.0 | 2020-01-01T01:00:00Z | 66.050522 | 4.5863313 |
| 3 | LINESTRING | FC04.1_C | CONDUITS | SWMM | 1 | 1.0 | 2020-01-01T01:00:00Z | 0.5314214 | 2.1729025 |
| 1 | LINESTRING | FC01.1_R | CONDUITS | SWMM | 2 | 2.0 | 2020-01-01T02:00:00Z | 19.547256 | 2.2898435 |
| 2 | LINESTRING | FC01.2_R | CONDUITS | SWMM | 2 | 2.0 | 2020-01-01T02:00:00Z | 50.088657 | 3.4779915 |
| 3 | LINESTRING | FC04.1_C | CONDUITS | SWMM | 2 | 2.0 | 2020-01-01T02:00:00Z | 0.6140663 | 2.2505249 |
| 1 | LINESTRING | FC01.1_R | CONDUITS | SWMM | 3 | 3.0 | 2020-01-01T03:00:00Z | 3.1847720 | 1.4646966 |
| 2 | LINESTRING | FC01.2_R | CONDUITS | SWMM | 3 | 3.0 | 2020-01-01T03:00:00Z | 7.6079978 | 0.5282743 |
| 3 | LINESTRING | FC04.1_C | CONDUITS | SWMM | 3 | 3.0 | 2020-01-01T03:00:00Z | 0.1079226 | 1.4705778 |
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