Geographic information system Essay Example

Geographic information system Essay Example Geographic information system Essay Geographic information system Essay In a proper way we will have apply the accepted geologic principles. A proper considerations of analytical factors will help in our effort. As there are various types of rock a photographic representation or guide line is not of much importance. In fact the number and relative effectiveness of geological events and various process (causes) that have acted upon them Is of much Importance to evaluate such features. This paper concentrate on the estimation of natural resources with the help of the Aerial photographic analysis. Key Words :1. Remote Sensing 2. Photograph 3. Natural resources 4. Information 5. Sub Area :Remote Sensing Broad Area :Engineering Geology Remote sensing is a technique by which collection of information about any object on the earth surface by recording device that Is not In physical contact with It. This technique is usually restricted to mean methods that record reflected or can say radiated electromagnetic energy, rather than methods that that involve significant penetration beneath(in to) the earth. With the help of Remote sensing technique, taking photograph [aerial photograph] and Interpret It. In fact geological studies are mostly dependent on the field and lab studies , but aerial photo exploitation revised sufficient informative data. The stereoscopic examination of aerial photographs makes possible the identification, selection, demarcation and delineation of lithographic units and enables to establish the stereographic sequence. Black and white photographs several standard such as tone, texture, landforms, topographic expression, slope, drainage pattern and texture, soil, vegetation, mode of weathering and surface features help in the identification of rocks. : Theory of Application of Remote Sensing Aerial photographs as well as satellite imagines occur with the Implementation of emote sensing with employing electromagnetic energy as the means of measuring 1 OFF because of Four-Fold reasons: 1. It provides a permanent record of any objects at any moment of time to the observer. 2. Characteristics feature of Any object which is not visible, can transformed into image clearly. 3. Certain types of aerial photographs and imagery can provide a 3-D view clearly. 4. It represents a relationships among larger area of Earth from a perspective view and provide a format by which we can study of any objects. Unlikeness of topography: It is more understandable on aerial photos than on the spot or in the fields. Topography refers to the level of the land. The difference in level is because of differences in resistances and binding capacities between the rock institution. It is because of this nature tough rocks like sandstones, quartzites granites make higher levels but the week rocks like clays and shale from lower levels. 2. Slope of Surface: This also gives valuable informations with references to underlying materials. Harder rocks form steeper slopes , sandstone forms cliffs but shale forms lower angle slope. On the other hand climate is an important factor in affecting the topography . Just depressed topography while it is tough in dry as lime stone in wet climate forms climate. Some igneous rocks also exhibit the same nature. 3. Drainage: The drainage capacity of rocks of two types (a) Macro drainage: It is like a surface drainage (b) Micro drainage: This includes the pattern and textures of the internal drainage character. The internal drainage is a recognizable feature from an aerial photograph. Impermeable rocks have short and closely formed deepest channels caused by the scattered. But sandstones which have high permeability and a tendency to form a moving mass of water rather than forming gullies. Drainage texture is also related to spacing of Joints and fractures. 4. Geometry of Rock shape and relative arrangement of rocks] This enables the interpreter to distinguish consolidated form unconsolidated sediments and sedimentary from igneous rocks. Belted topography may be the result of tilted consolidated sediments and irregular. Dykes are generally noted by their forms and pattern. Acid dykes are more resistant while basic dykes are less in humid areas. 5. Features of Surface: In topographic map this features will appear so small, but this is very important for topographical interpretation from aerial photographs. Various distinctive micro- features marks in this aerial photography for gneiss, gravel, shale, schist, reality, sand-shale, siltstone, basalt, serpentine, granite , lava etc. 6. Tone and Color: In this section, relative tones play very important role to detection of natural resources.