Introduction
The main topic of the Naivasha project is about the availability on water, quantity as well as quality. Therefore a project is carried out in conjunction with the Dutch Embassy, ITC Enschede, WWF Kenya and WRMA Naivasha (Water Resources Management Authority). One of the platforms for dissemination is an online viewer to shows information received on a daily basis. This data is made available by WRMA.
This page is made to give users some background information of the functionality and data flows of the viewer via the MajiSys (Swahili/English for Water System).
Setup
The viewer is the platform for dissemination of data inserted in a database and or in other manners made available to the project. The picture below shows a schematized setup of the datamanagement system which is also in place at WRMA office in Naivasha.
The schema shows the overall architecture of the MajiSys. Via OGC web services data from the database are disseminated to the Information layer. The Data Import Module in this schema consist of various component and is supported by FEWS. FEWS enables easy loading and validation of time series data which can be imported via automated procedures. Another part of the Data Import Module is made by Upande and will consist of various Data Entry Forms for user friendly data entry. Form handling for this part is directed by the contents of the database.
The viewer
The Viewer is for now a means of dissemination of results and data.The viewer can be reached by its technical name (http://naivasha.openearth.eu). Credentials are necessary and provided to you by email.
The viewer consists of various parts. Below a screen dump of the viewer.
On the right hand site the so called canvas, in this case populated by background maps of OpenStreetMap. In the canvas on the upper left three zoom levels are defined:
- Extent Naivasha
- Regional extent
- National Extent
On the upper right site + and - buttons are available for zoom in and zoom out actions. This can also be done by respectively scroll wheel forward and backward.
On the left hand side the so called table of contents with the logo's of the contributing parties. Directly below that three items are available, which are presented as tabs, these are:
- time series (gets available time series data)
- misc data (displays available static layers)
Time Series
The Time series tab fires a process (a Web Processing Service) which harvests a list of parameters form the database. The result is a list of available parameters in the database, like the following picture.
These time series data are inserted via FEWS and stored is a specific part of the database.
As soon as a user has given some dates of interest in the time period section of the table of contents of the time series tab the corresponding data (locations) are harvested from the database and visualized by the viewer. A user can then click a location and a third WPS is fired that get's the time series. This is presented as a time series plot over the viewer. For instance for the daily automatically harvested precipitation of rainfall data.
Future plans
For now this is the first version available. For 2015 it is planned to have a Data Entry Module to be operational so more data can be entered in a user friendly way. For time series data this should be directly visible in the graphs. WPS Hymos functionality will be added from end of this year.
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