This dataset for Lake Victoria includes the following parameters: 1. Ecological water quality parameters (including Chlorophyll-a surface concentration, Suspended Particulate Matter (SPM) and Lake Surface Temperature (LST)), 2. Monitoring of the proliferation of macro-algae (water hyacinth index from optical data, water hyacinth likelihood index from radar data, and Floating Vegetation), 3. Sustainability indexes (evolution of land cover land use (1984 2014), evolution of surface occupied by water hyacinth, evolution of pollution release into the lake due to rainfall streaming, 4. Other data products (lake bathymetry, topography, time series of meteorological observations). Attached images are only JPG map visualizations. Raw data can be accessed through the external link resource. This dataset is one of the products produced under the 2014-2016 World Bank (WBG) European Space Agency (ESA) partnership, and is published in the partnership report: Earth Observation for Sustainable Development, June 2016.

Shoreline, Lake Victoria, vector line, ~2015 Reference Information and Units: Projection: ESRI:102024 (http://spatialreference.org/) GCS: WGS 1984 Resolution: 1:25:000 File Naming Convention: LV_Shoreline_line.shp Data Origin: Manual Digitization from Open-Source Imagery Sensor: various Code: na Data Development/Processing: This data represents the entirety of the shoreline, including the islands, of Lake Victoria digitized at a fixed 1:25,000 scale A 20x20 fishnet was created and used to monitor progress and ensure the entirety of the lake was accounted for in the data set.

Data of Lake Victoria, which is located in Minnesota. Data on the size and depth of the waterbody / on the area of the basin and the length of the river

Lake victoria edges for all the three countries:These data were collected and processed stem from a broad variety of sources, including the National Water Resources Departments, Meteorological Departments, completed or ongoing projects in the region, public domain data sources on the internet, FAO and the project’s own activities

This is a shapefile for the entire Lake Victoria Basin in East Africa.

This data set includes the SYNOP surface meteorological observations from stations in the Lake Victoria region of Africa. SYNOP messages are typically sent every six hours. The data are in the SYNOP ASCII format.

Lake Victoria
This dataset falls under the category Planning & Policy Other.
It contains the following data: Shapefile of Lake Victoria
This dataset was scouted on as part of a data sourcing project conducted by TUMI. License information might be outdated: Check original source for current licensing. The data can be accessed using the following URL / API Endpoint: https://pearlgeoportal.com/download/914/eyJpdiI6InZhSSsvYWF6UUZlcXlOYjRkaEVQRFE9PSIsInZhbHVlIjoiRDlpSEpQMHQ1ZTA3ZWwxajdCak00RFJUbnZoa1dHMVFxSklUTVp1WGlndz0iLCJtYWMiOiIzZTgyM2YyMmI4ZmEyODc0ZTRiNTIyYTA1MDI5M2IwMDU5MTYwMTU3YTA1MDAwMmUyNTZjOWUyNzZjOGFmZTM5In0=See URL for data access and license information.

This is ROMS for Lake Victoria output, validation data and gis mapping shape files

Basin, Lake Victoria Watershed (inside), vector polygon, ~2015 Reference Information and Units: GCS: SR-ORG:14 (http://spatialreference.org/) Projection: ESRI:102024 (http://spatialreference.org/) Pixel Size: NA Units: NA Digitized Scale: 1:25000 File Naming Convention: LV_Basin_90m.shp Data Origin: Developed at Salisbury University Sensor: SRTM Code: NA Data Development/Processing: Using the ArcGIS hydrology watershed process on 90 m SRTM

This dataset shows dams constructed in Lake Victoria Basin

Bathymetry TIFF, Lake Victoria Bathymetry, raster, 2017 Reference Information and Units: Projected Coordinate System: Africa Lambert Conformal Conic ESRI:102024 (https://epsg.io/102024) Geographic Datum: D_WGS_1984 Pixel Size: 100 meters Units: Meters File Naming Convention: LV_Bathy_V7.tif Data Origin: The point data was obtained from an Admiral Bathymetry map and points collected in the field. In addition, we used points from other maps and acoustic sounding data. The final input point total is approximately 4,087,217. Of the total 4,087,217 points, 120,000 of them are clustered around three specific bays. Roughly, 3.8 million points come from the survey conducted by Lake Victoria Regional Hydro-acoustics Working Group and are along the boats path around the lake. Although updates are still occurring this product is no longer Beta in v3. More information regarding depth points can be found in the metadata of LV_Bathymetry_Points_V7. Data Development: This TIFF was created from running an Ordinary Kriging on points that were obtained from taking digitized points from an Admiral Bathymetry map and points collected in the field as well as from other maps. These points were combined into the same file and had their depths converted to the same unit (meters). All points that were outside of the Lake Victoria shoreline polygon were removed. The points that were marked as greater than the recorded depth were removed. See the point file for more point metadata. A cross-validation point dataset is provided in point format as well as various rendering files and the kriging settings file. Additional Information: Full information can be found at: http://bit.ly/LV_Bathy

The six datasets are associated with a paper on determining reference points for three major fish stocks in Lake Victoria. Two main data files (Lake_wide_stocks_bioAtlaSim_1, Lake_wide_stocks_bioTrawHydr_2) are used for estimating lake wide reference points when the indicator of abundance is biomass or catch per unit effort (CPUE). The file: and Lake_Victoria_uganda_stocks_3 is for stocks of the Ugandan part. The ID files correspond each of the main data files and the sets of data are linked by the digits 1-3 at the of the file name. For description of terms in each dataset, visit http://oceanrep.geomar.de/33076/.

Lake Victoria basin is located in the upper reaches of the Nile River basin and occupies an area of about 251,000km2 of which 69,000km2 is the lake area (UNEP, 2006) and is shared by Kenya, Uganda, Tanzania, Rwanda and Burundi. The basin contains Lake Victoria, which is the largest freshwater lake in Africa and the second largest freshwater lake of the world (UNEP, 2006). Lake Victoria draws 20% of its water from the Kagera, Mara, Simiyu, Gurumeti, Yala, Nyando, Migori and Sondu-Miriu rivers. The remaining 80% is from direct rainfall. The catchment area is surrounded by mountains on all sides except for the northern part. This dataset consists of seventy (70) occurrence records of macro-invertebrates of different families that were observed from various part of Simiyu River Catchment in northern Tanzania. The dataset covers the period of December 2019, and contains 70 occurrence records belonging to 8 orders, and 27 families. Mobilization and preparation of this dataset was funded by JRS Biodiversity Foundation through Global Biodiversity Information Facility (GBIF) and Biodiversity Information for Development programme.

The LLO operates in conjunction with the Limnological Research Center (LRC) in working towards fulfilling the objectives of the International Decade for the East African Lakes (IDEAL) to study the East African Lakes. The Lake Victoria project is funded by NSF. Like Lake Victoria, extensive work is being continued on Lake Malawi, Lake Turkana, and Lake Edward. In addition to the East African lakes, the LLO is working on Lake Issyk Kul', Lake Nicaragua, and Lake Superior. Summary: The Biogenic Silica Data file contains data for 5 cores taken from various sites in Lake Victoria. The data include ship, coring date, water depth, latitude/longitude, sampling device, sampled interval, % biogenic silica, and 14C dates. Cores were sampled at 10 cm intervals for biogenic silica analysis. Samples taken for 14C dating were prepared at the LRC Laboratory and sent to an outside AMS Facility for analysis. Pollen, charcoal, and plant macrofossils were dated. Biogenic Silica analysis was done using a timed, wet extraction technique adapted from D. J. DeMaster (1979). The analysis was done using 0.5 M NaOH at 85 0C.

The main objective of the project was to develop Lake Victoria water quality and ecosystems geospatial database. The land cover data provided information on the ecosystem degradation.

Bathymetry Points, Lake Victoria, vector point, 1900-2017 Reference Information and Units: Projected Coordinate System: Africa Lambert Conformal Conic ESRI:102024 (https://epsg.io/102024) GCS: GCS_WGS_1984 File Naming Convention: LV_Bathymetry_Points_V7.shp Data Origin: Admiral Bathymetric Maps: Description: British admiral bathymetry maps of the lake. Maps were scanned and georeferenced. Once georeferenced the depth points were digitized Points: Approximately 5,212 Year: 1900-1955 Depth Sounder: Description: Depth readings taken from a depth sounder were read into ArcMap using X, Y coordinates Points: Approximately 5,888 Year: 2013 German Bathymetry Map: Description: A German bathymetry map was scanned and georeferenced. Once georeferenced the depth points were digitized. Points: Approximately 50 Year: 1913 Acoustic Surveys from Nafirri: Description: Instruments used are two Depth Profiling systems (a submersible Conductivity Temperature-Depth profiling system (CTD, Sea and Sun Technologies) and a YSI 650 multiparameter Sonde). Readings were read into ArcMap using X, Y coordinates. Date: 11/2015: Approximately 55 points Date: 8/2016 Approximately 50 points Limnology Survey from Nafirri: Description: Limnology survey using acoustic equipment and GPS Points: Approximately 10 Date: 2007/2008 Sounding Data: Description: Depth readings taken from a depth sounder were read into ArcMap using X, Y coordinates Points: Approximately 17,200 Date: 2009 Acoustic Sounder Strata Data: Description: Points were taken to determine the strata of the lake by using a Simrad EK60 echo sounder. These points contained Z values. The points were read into ArcMap using X, Y coordinates Points: Approximately 45 Date: 2009 Lake Victoria Bathymetric Survey For EAC/LVBC: Description: Points were taken using a single beam echo sounder 200kHz and were provided from Ola at MMT. These points are concentrated in three bays, Mwanza Gulf (TZ), Kisumu (KY), and Port Bell (UG). Points: Approximately 120,000 Date: 2007 Lake Victoria Regional Hydro-acoustics Working Group: Description: The survey was conducted by the Lake Victoria Regional Hydroacoustics Working Group under coordination of LVFO with NSF project funds. It was conducted using Tanzania's RV. Lake Victoria Explorer. Points: Approximately 3,945,260 Date: 09/12/2017 – 10/5/2017 Data Development: The final bathymetry points were created by converting all sources to the same unit(meters). Once all sources were in the same unit they were combined into the same file. When all points were in the same file a spatial query was ran to select all the bathymetry points that fell outside of the Lake Victoria shoreline polygon. Any point that was located outside of the shoreline polygon was removed from the file. The next step was to remove the redundant points. PostgresSQL was used to find all the points that were within 100 meters from another point (SQL Code 1). One of the points would be removed from the final set of points to clean up the data. The points that were obtained from the survey conducted for the EAC/LVBC were not included in the removing of points within 100 meters of one another. Any point from version 6 that was located within 100 meters of a point from the Lake Victoria Regional Hydro-acoustics Working Group dataset, was removed. All points from the acoustic survey conducted by Lake Victoria Regional Hydro-acoustics Working Group were kept regardless of their distance from each other. PostgresSQL was also used to check the depths of points in relation to points around them to determine outliers (SQL Code 2). Outliers were double checked and removed if not deemed plausible. Points that were denoted as “greater than” the recorded depth were removed if the depth was less than 60.96 meters. SQL Code 1: Finds all points within 100 meters of another point select a.objectid, b.objectid from lv_bathymetry_points_v5 as a, lv_bathymetry_points_v5 as b where st_distance(a.geom,b.geom) < 100 and a.objectid != b.objectid SQL Code 2: Checks for points with depths that are outliers compared to neighbor points select a.objectid, b.objectid, (@(a.z - b.z)) as z_diff from lv_bathymetry_points_v5 as a, lv_bathymetry_points_v5 as b where (@(a.z - b.z)) > 5 and st_distance(a.geom, b.geom) < 200

Lake Victoria Macrophytes on the Kenyan side

Historic and Projected Runoff for the 4 Lake Victoria Sub-Regions of Lake Victoria sub-region, Simiyu sub-region, Kagera sub-region and Victoria Nile sub-region

Sub Basins, Lake Victoria Watershed, vector polygon, 2000 Reference Information and Units: Projection: ESRI:102024 (http://spatialreference.org/). GCS: WGS 1984 Resolution: Developed from 3 arc-second data File Naming Convention: LV_Sub_Basins.shp Data Origin: Original SRTM dataset was downloaded from: http://srtm.csi.cgiar.org/ Sensor: SRTM Code: na Data Development/Processing: The above datasets were processed using Fill > Flow Direction > Flow Accumulation. The output of this process was then used as an input in the Soil & Water Assessment Tool (SWAT) to delineate sub basins within the greater Lake Victoria basin. For further information on SWAT, please refer to the SWAT manual: http://swat.tamu.edu/documentation

At this scale 1cm on the map represents 1km on the ground. Each map covers a minimum area of 0.5 degrees longitude by 0.5 degrees latitude or about 54 kilometres by 54 kilometres. The contour interval is 20 metres. Many maps are supplemented by hill shading. These maps contain natural and constructed features including road and rail infrastructure, vegetation, hydrography, contours, localities and some administrative boundaries.Product SpecificationsCoverage: Australia is covered by more than 3000 x 1:100 000 scale maps, of which 1600 have been published as printed maps. Unpublished maps are available as compilations. Currency: Ranges from 1961 to 2009. Average 1997.Coordinates: Geographical and either AMG or MGA coordinates.Datum: AGD66, GDA94; AHDProjection: Universal Transverse Mercator UTM.Medium: Printed maps: Paper, flat and folded copies. Compilations: Paper or film, flat copies only.Forward Program: Selected maps under revision.