The Study of Interaction between Electromagnetic Waves and Distribution of Soil Salt Crust using Geo-informatics Technology in Kham Thale So District, Nakhon Ratchasima Province

Abstract

A study of the interaction between electromagnetic waves and the distribution of soil salt crust with geospatial technology in Kham Thale So District, Nakhon Ratchasima province. The objective of this research was to study the unique interaction characteristics of soil salt crust with electromagnetic wave energy (spectral signature) from landsat-8 satellite image. In this research study from 4 band, the blue, green, red and near-infrared band with the geometric correction process. A process of radiometric correction and conversion of a digital number (DN) to the reflected true earth surface energy, and map the distribution of surface salt deposits, based on landsat-8 satellite image data using spectral angle mapper with spectral comparison classification.

           The results of the study were as follows: The characteristic interaction characteristics of soil salt crust with electromagnetic wave energy statistical value of the true energy reflection of the soil salt crust. It has the lowest reflectivity of 0.1710 in the near infrared band, and the highest value was 0.3281 in the red band.  The distribution of surface salt deposits by spectral angle mapper classification. It was found that the most common sub-districts were Nong Suang sub-district has an area of ​​407,231 square meters, representing 56.52% of the total area found, followed by Pong Dang sub-district. There was a soil salt crust area of ​​171,511 square meters, representing 23.81% of the total area found. Bung Or sub-district has a soil salt crust area of ​​55,269 square meters, representing 7.67% of the total area found. Kham Thale So sub-district, salt deposits were detected at 52,904 square meters, accounting for 7.34 percent of the total area found and Pan Dung sub-district was the area with the least soil salt crust detected, with a soil salt crust area of ​​33,550 square meters, accounting for 4.66 percent of the total area found.