OBIS: Time series data

Revision as of 10:13, 5 February 2013

The section time series data is one of the core features of OBIS. OBIS allows the management,visualization and download of time series data. The section "Time series data" gives first an overview of all datasets. The measured data are directly linked to the stations, where they have been measured (see figure below).

On the screen most important information are listed:

• Dataset title consists of measured parameter and station name, e.g. "Climate Benguela"
• Start of timeseries (yy-mm-dd)
• End of timeseries (yy-mm-dd)
• Time step, e.g. daily, monthly
• TS Measurement + Data Gaps, e.g. precipitation, discharge
• TS Data contains the link to access the data [show]

Metadata

With a click on "Details" you can see all data linked to the dataset. First metadata are listed. They are grouped in Title, Timeseries information, Dataset and Station details.

If you chose the register "TS Measurements + Data Gaps" timeseries are listed. In the example Luanda eight timeseries are available.

Show near stations

RBIS allows to search for nearby stations to include timeseries from neighbouring stations in various calculations. The table lists nearby stations, their distance, dataset title, elevation, coefficient of determination (rsquared) and start and end date of timeseries. You can order the results by distance or rsquared. OBIS allows further to search for specific stations, e.g. nearest stations, high coefficients of determination or a specific time frame. For each timeseries it is possible to conduct a gap analysis. A plot can be generated, where gaps greater than 5 days are marked in red.

Show timeseries data

The section "overall statistics and actions" lists the number of entries in total and in brackets the number of entries for each parameter. You get an overview of the completeness of the timeseries or number of gaps. Start and end date of the timeseries is shown. For the export of data you have two possibilities: If you are interested in the entire dataset, use the download link "database data" and you get a txt-file containing all data and metadata. The example "climate Luanda" file opened in an editor, shows you station information and timeseries information, lists the parameters in their correct order and gives you the monthly data. Using this download link you get the data as they are stored in the database (no default values, no date gaps). Using the download link "file" the original file will be exported as it has been uploaded to the database.

In the section "Interval statistics and actions" you have the possibility to view the timeseries data in a plot. You can set a time interval and parameters of interest. Therefore enter the time interval in the entry fields, activate the parameters of interest and confirm the selection by clicking "set interval & parameter". By clicking on "show plot" a graph appears visualizing timeseries data for the timeframe and parameters selected before. By clicking on the link "download" you get the timeseries for this respective time frame and parameters. You can also chose the function "aggregated export" for download. This feature allows to export e.g. average data, max or min values or sum.

Visualization of a txt-file in PSPad

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