USGS - science for a changing world

Land Cover Applications and Global Change


Senegal Biodiversity Pilot Study in Support of GITAN and GEO BON

Map Gallery

The following gallery contains graphics of key geographic data sets compiled from both earlier and ongoing efforts to map and monitor the land resources of Senegal. The collection is a set of map themes that have particular relevance for supporting biodiversity studies in Senegal. We begin with key baseline maps, followed by themes that are more specific to biodiversity.

Map 1

Map 1. A series of maps showing average annual rainfall accumulations, spanning nearly six decades, in Senegal and The Gambia. Note the significant southward shift of isohyets over time. The rainfall data were obtained from ground stations. Ten-year averages were computed for each station. A three-dimensional surface of values was then computed through automated interpolation of the point rainfall data.

Map 2

Map 2. Major Soil Divisions of Senegal. This map was generalized from the "Morpho-Pedology Map of Senegal" originally published at 1:500,000 scale (Stancioff et al., 1986)

Map 3

Map 3. Map of Soil Susceptibility to Water Erosion. This map was derived from the soil texture attribute of the Morpho-Pedology Map of Senegal. Each soil type was grouped into one of five classes of water erosion potential. The ratings are based on exposed soil conditions when vegetation cover is removed.

Map 4

Map 4. Vegetation Map of Senegal, modified from the "Carte du Couvert Végétal du Sénégal" (Map of Vegetation Cover of Senegal) originally published in Stancioff et al., (1986), and digitized by EROS. The map was produced from interpretation of Landsat images and extensive field work carried out from 1982-84.

Map 5

Map 5. Senegal Land Use and Land Cover in 1975 (top) and 2000 (bottom). These maps were produced from raster-based interpretation of Landsat satellite imagery. See West Africa Land Use and Land Cover Trends Task for more information on this product.

Map 6

Map 6. The Agro-Ecological Regions of Senegal. These regions were defined through integration of various components of the natural and socioeconomic components of the landscapes, including both biophysical (climate, geology, hydrology, soils, vegetation) and human factors (settlement patterns, land use).

Map 7

Map 7. Hydrography of Senegal. The drainage network was digitized from existing base maps published at 1:500,000 scale.

Map 8

Map 8. Map of Shaded Relief of Senegal. This map was derived from Shuttle Radar Topographic Mission (SRTM) digital elevation data compiled from a 90-meter resolution dataset. It shows many of the major topographic and elevation features of Senegal, including numerous fossil valleys, and the distinctive ring structure of an impact crater in the south.

Map 9

Map 9. Map of the protected areas of Senegal. This was compiled from best available sources of existing base maps of Senegal. Approximately 30 percent of Senegal benefits from protected area status.

Map 10

Map 10. A pair of maps showing the change in general woodland and forest conditions in Senegal and The Gambia from 1965 to 1994. Woodland and forest classes were assigned to one of four conditions based on assessments of high resolution Corona photography (1965) and aerial photography (1994). Evidence of selective logging and charcoal production within the wooded areas were the main indicators used. The various types of wooded savannas, woodlands, and forests are not distinguished on this map.

Map 11a

Map 11

Map 11. Maps of distribution and abundance of select tree species in Senegal. More than 200 species of woody shrubs and trees were inventoried based on ground based data collected in the early 1980s. The species shown here are selected examples, based on their roles as indicator species of human activity (used in traditional farming systems, e.g. Acacia albida or Cordyla pinnata), or human pressure on trees with valuable wood (e.g. Pterocarpus erinaceus, Prosopis africana, Khaya senegalensis), or human pressure on trees for firewood (e.g. Acacia nilotica, Combretum glutinosum), or economically valuable forest products (e.g. Acacia senegal, Tamarindus indica).

Map 12

Map 12. A time-series of maps derived from the agricultural classes in the vegetation map (1982), Corona photography (1966), and estimated extents of agriculture from historical documents, including the National Atlas of Senegal. While this series shows agriculture expanding rapidly, the rate of expansion slows considerably after 1982 according to the land use and land cover maps we produced from Landsat in 1975 and 2000.

Accessibility FOIA Privacy Policies and Notices

Take Pride in America logo logo U.S. Department of the Interior | U.S. Geological Survey
Page Contact Information:
Page Last Modified: March 26, 2013