In order to better constrain the utility of multispectral datasets in the characterization of surface materials, Landsat 8 data were evaluated in the discrimination of geological classes in KISANTU and its vicinity. Ground-based measurements collected from the study area highlight the importance of limestone in that area. The spatial distribution of exposed lithologies in the study area was determined through an image resulting from a band ratio (band 7/band 6) that shows the distribution of clays coming from the alteration of the rocks below; and another image using a band ratio transform (band 6/band 7) to identify limestone. Despite some shortcomings coming from the unsupervised classification, the merging of band ratio and the principal component analyze gives an overall representation of the spatial distribution of exposed geological materials in the study area.

The bioaccumulation of four heavy metals (Zn, Pb, Cu and Cd) in Clarias gariepinus (Burchell, 1822), Chrysichthys nigrodigitatus (Lacepède, 1803), Mormyrops anguilloides (Linnaeus, 1758) and Coptodon rendalli (Boulenger, 1897) fluently fished and sold in Kingabwa district (Kinshasa, Democratic Republic of the Congo). At first, the results of physico-chemical analysis of water of inspected sites (2) revealed that the values of pH and temperature are in the standards as recommended by WHO and FAO, while the conductivity as well as the dissolved total solids in inspected sites are very weak.. Yet, the two sites are polluted by heavy metals. Secondly, the dosage of heavy metals by atomic absorption spectrometry revealed that all tested fish are polluted. However, the Cadmium has not been detected in the muscles of three fish: Clarias gariepinus, Coptodon rendalli and Mormyrops anguloides. Meanwhile, Coptodon rendalli species didn't reveal any presence of Lead in its muscles. The results obtained show that the consumption of these fish can represent a health risk for the exposed populations notably fishers and their family who consume these fish at least once per day. Thus, by formulating the hypothesis that the fisher or his family is the more exposed and while increasing the quantity of fish for example from 0.025 kg/j to 0.5 kg/j, we can note that the coefficient of danger is superior to 1 for the cadmium and then the danger becomes apparent. It is therefore desirable that the Democratic Republic of the Congo authorities can develop a better policy for the management of the interior waters in order to avoid possible health problems linked to the pollutions of these waters.

Oil blocks have been delimited by parallels and meridians squares since years up to now in DRC. This technics is not suitable and common, that is why in order to better limit the different oil blocks in the West-Congolian sedimentary basin, we used the Lansat 8 data to bring out lineaments which help to set geological structural model. Lineaments probably coming from tectonic movements have been identified throughout the surface of lithological units in the West-Congolian basin. The principal component analysis, the band ratio and some filterings helped to get more details about that. Data coming from existing maps combined with groundtruth data have been compared to teleanalytic data.