> For the complete documentation index, see [llms.txt](https://brightwind.gitbook.io/brighthub-user-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://brightwind.gitbook.io/brighthub-user-docs/reference-user-manual/setup-tab/measurements.md).
# Measurements
#### Measurements Tab
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The Measurements Tab provides the measurements made by the measurement station. Each measurement relates to a *measurement point*.
A **measurement point**, as described in the IEA Task 43 WRA Data Model, is a point in space described by the geographical location of the measurement station combined with the height at which the measurement is taken. This point in space is associated with a measurement type such as a windspeed or direction. The measurement point is independent of the sensor associated with it and the data columns and logger measurement configs. This is because each of these can change over the course of the measurement campaign. The data model allows each of these changes to a fixed measurement point to be traced through the lifetime of the measurement campaign for easy data postprocessing and automation.
* The Measurements tab lists all the measurements BrightHub has identified in the ingested files.\
E.g. a measurement with name 'Spd\_100m' and measurement type of 'wind speed' could be assigned to measurement of wind speed from an anemometer mounted at a height of 100m.
* You can edit the measurement point names to whatever you wish.
* The height reference defaults to ground level - this field may be updated if, for example, the measurement heights were instead referenced to sea level.
* The information in the Measurements tab should be cross-referenced with the Logger Measurement Configs tab to ensure that the measurement names correspond to the correct data column name.
**Summary Table**
At the bottom of the Measurements tab is the Summary Table which shows the complete configurations of all measurements for the measurement station.
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**Presets**\
There are helpful presets to filter the large summary table to efficiently access metadata, for example:
* **Summary**: summary columns for all measurements (shown)
* **Wind Speed**: selecting the Wind Speed preset shows the configurations for all wind speed measurements only
* **Wind Direction**: selecting the Wind Direction preset shows the configurations for all wind direction measurements only
* **Solar**: the Solar preset shows the configurations for all solar measurements only
* **Sensor**: the Sensor preset filters columns to those containing details of the sensors.\
You can also combine presets, for example to get a summary table of the metadata relating to all sensors for wind speed measurements, you could toggle both the wind speed preset and the sensor preset simultaneously.
**Columns**\
You can customise which columns are shown in the summary table by clicking Columns, seaching for the column you want to see and selecting from the dropdown.
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**Filters**\
You can filter the summary table by clicking on Filters.\
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A filter should consist of a column, operator and value:
1. Click Filters.
2. Select the column you want to filter from the Columns dropdown, for example the 'Name' column.
3. Select the operator you would like to use - you can filter to find any field which 'contains', 'equals', 'starts with', 'ends with', 'is empty', 'is not empty' or 'is any of' the value you specify.
4. Specify the value, for example 'Spd' in the example shown.\
The example filter shown finds all entries in the summary table for which the name column contains the value 'Spd'.
5. Click on *Add Filter* to apply additional filters - note that you can apply multiple filters at a time:
* Specify and to return rows for which all filters are satisfied.
* Specify or to return rows for which either one of or all of the filters are satisfied.
6. To remove a filter, click on the 'x'.
Note that you can combine selecting Columns with applying Filters and using Presets.\
**Density**\
The row spacing can be adjusted by clicking on Density.\
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**Export**\
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The entire summary table can be exported by clicking Export, with the option to print the table or download as a CSV file.
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