# 论文代写-密西西比河盆地

The study area is the Lower Mississippi River Basin (LMRB), which is located in southeastern Louisiana, USA, and extends from the parishes north of Lake Pontchartrain to the coast. This region has lost about 2000 square miles land in the past 80 years. Due to Louisiana boasts more than 4 million acres of wetlands and representing 40% of the nation’s total which is easy to be corrode, it is a good sample to study the land fragmentation topic. In order to do the study, different methods have been used for the purpose of analysis of the loss of land from the year 1996 to 2010. On the basis of the same, the inferences have been gained.
Methods

Another useful method for the purpose of finding out the research related to the analysis of the fragmentation in the Louisiana area is the triangular prism method. The triangular prism method is very simple to compute. This method was put forward by Clarke. This method can be used for the purpose of calculation of the topographical surfaces. This method can be of a large use in case of remote sensing images. This method makes the use of the raster representation of the surface of the earth which is elevated and is known as DEM (Mishra & Deepak 176). The image can be observed in the grid on the x coordinate and the y coordinate and the value of the pixel is taken in the z coordinate. This also helps to provide the vertical dimension for the cell. When the value has been taken on the pixels it constitutes the 4 corners of the square. After this, a vertical line is drawn which is equal to the mean value from the center of the square grid. The straight lines are drawn which may join the top of each corner lines and also with the center line. This gives the definition of the triangular surfaces which may comprise the triangular prism. The area which is there on the top of the prism can be calculated with the help of the trigonometric formula (Couvillion & Brady 1).
This procedure is repeated after every step size. After each and every successful computation the calculation related to the cell area is done which is larger than the previous one. This process is calculated until the whole image area is found out. Though, under the same there is a diminishing of the image resolution and loss of information when the individual pixel values are replaced by the mean at the center. The square grid is required to be made up of different sizes. But the calculation is done first for the square grid which has the largest step size.