⚠️ Please read the Wiki on GitHub to understand how to use the materials
The Altimetry Water Level Data Management Tool is created to facilitate the easy downloading, filtering, mapping, and plotting of river altimetry data from the processing centres CLMS, Dahiti, and Hydroweb.
This tool is capable of downloading and processing the following data from the processing centres:
- CLMS: River Water Level 2002-present (vector), global, Near Real Time – version 2
- Dahiti: Water Level Time Series from Satellite Altimetry
- Hydroweb: Theia Hydroweb Operational Altimetry River Water Level (ID: HYDROWEB_RIVERS_OPE)
The script given in Download_CLMS_data.py is based on the codes given by William Ray in GitHubGist
The script given in Download_Dahiti_data.py is based on the codes given by Christian Schwatke in the Dahiti website
The script given in Download_Hydroweb_data.py is using the python package Py Hydroweb
The use of the Altimetry Water Level Data Management Tool produces various results. A sample of results for Niger basin are presented in the image.
The virtual stations from processing centres are handled in this tool as follows:
- Filtering
- First filter with requirements about percentage of temporal coverage and number of maximum days of allowed gaps.
- Second filter is based on the selected stations from first filter and the specified time period.
- Least squares method (LSM)
- Linear trend, Annual amplitude, Semiannual amplitude.
- Mapping of filtered virtual stations
- Gives an overview of where virtual stations are located.
- Geospatial and timeseries comparison
- Triple match and double match to compare altimetry data from each virtual station