Satellite remote sensing has contributed immensely to the interpretation of linear features and other geological structures. In the study area, lineaments mapped were linear and planar features on satellite imageries that are expression of fractures, or faults within the subsurface. Image lines of different contrast may extend from a few centimetres to several of metres in length. The Landsat imagery used has a spatial resolution of 30 x 30 m, and eleven spectral bands covering the visible and thermal region of electromagnetic spectrum. Four spectral bands were selected and used for the purpose of structural mapping namely; thermal infra-red band (Band 11), 11.5 to 12.51 µm; Short-wave infrared (Band 6), 1.57 -1.65 µm; near Infrared (Band 5) 0.85 to 0.88 µm and Red (Band 4) 0.64 -0.67 µm. Lineaments extracted from the digital satellite scene are concentrated mostly on the sandstone belt in the North-East close to Amasiri area. A total of 116 lineaments were generated. Seven thematic maps were produced; digital elevation model (DEM) was used to create surface features maps, shaded relief and slope while the regional lineament map was digitized from the enhanced colour composites of Landsat ETM (bands 7, 5 and 2) image using ARCGIS 10.0 software for visual extraction and delineation of geological structures which were also ground-truth. The area indicates major NE -SW to minor E -W orientation of lineaments. The lineament density identified indicates regional lineaments are of great importance as indexes for groundwater exploration, mineralization targets, rocks quarrying and structural interpretation.
Semantics is an aspect of linguistic study that investigates the meaning of words and sentences in languages. Scholars from different disciplines like philosophy, logic, anthropology, psychology and linguistics are interested in exploring the nature of meaning. But linguistics differs from these disciplines because it investigates meaning in a systematic and objective pattern. As people's experiences and world view change, so do the meanings they associate to word change. Therefore, meaning is a concept usually influenced by different factors. An utterance can be interpreted in diverse ways depending on the emotional disposition of the speaker at the time of making the utterance. Because of this, the intended meaning of an utterance may be different from the meaning perceived by the receiver of the message. By adopting the thematic approach to the study of meaning, this paper x-rays the different dimension of meaning with special emphasis on the investigation of theta roles in the Igbo language. The paper argues that as part of its inherent lexical specification, a verb or a preposition requires its arguments (which are usually nouns) to be in specific thematic roles because where there is one argument, there is one theta function; and the semantic interpretation of a particular object is the determining factor for the type of theta role the argument will be assigned.
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