Winam Gulf, Kenya

Data and Imagery

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The timeline (above) displays the area of water hyacinth, in hectares, observed on the surface of Winam Gulf, Kenya on a series of dates. The table to the right contains the same data in text format. The values can be copied and pasted into the application of your choice for analysis.
date
area (Ha)
1994-10-08
270.72
1996-02-15
317.00
1997-04-19
436.68
1998-03-04
8504.75
1998-05-29
4846.68
1998-07-26
12090.75
1998-11-06
17217.81
1999-12-17
3133.80
2000-02-12
531.99
2001-04-05
1076.25
2001-05-12
1347.03
The classified images, to the left, of Winam Bay have been superimposed on a shaded elevation matrix (from GTOPO30), with population points and hydrography (from the Digital Chart of the World) and the main body of Lake Victoria (in dark blue, from the USGS report) added to provide locational context. These images, and the nine below, are linked to high-resolution images that can be panned and zoomed in and out so that you can view details of the water hyacinth's location on particular dates. The legend below applies to area inside Winam Gulf for all ten images.
Date: 1994-10-08
Area covered by water hyacinth (Ha): 270.72
% of Winam Gulf visible: 99.80
Water surface of Winam Gulf visible on date
Water hyacinth visible on date
Obscured on date (clouds, outside image area)
Date: 1996-02-15
Area covered (Ha): 317.00
% visible: 99.57
Date: 1997-04-19
Area covered (Ha): 436.68
% visible: 60.41		 Date: 1998-03-04
Area covered (Ha): 8504.75
% visible: 100		 Date: 1998-05-29
Area covered (Ha): 4846.68
% visible: 97.64
Date: 1998-07-26
Area covered (Ha): 12090.75
% visible: 100		 Date: 1998-11-06
Area covered (Ha): 17217.81
% visible: 100		 Date: 1999-12-17
Area covered (Ha): 3133.8
% visible: 100
Date: 2000-02-12
Area covered (Ha): 531.99
% visible: 94.59		 Date: 2001-04-05
Area covered (Ha): 1076.25
% visible: 100		 Date: 2001-05-12
Area covered (Ha): 1347.03
% visible: 100

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