Avaliação da precisão de terraços locados via Cad-Earth

Soil is one of the most important natural elements of the terrestrial biosphere, where conservation methods must be adopted in a field of production in order to reduce its degradation by edaphoclimatic agents. Terracing is a widely used method of soil con servation, characteristic of landfills and landfills on ground level contours. The instruments used in the delimitation of level contours in the field are wide, being: Level of precision, Theodolite and Hose Level. Currently, electronic tools linked to the Internet have presented an advance and reliability in the operation of this activity, among them, the Google Earth application, which through an AutoCAD software plugin allows, through geo referenced images of a terrain, generate curves of level. In the p resent work, the "plugin" used was the Cad Earth. This plugin is designed to import / export terrain images, objects and meshes between Google Earth and CAD programs, also creating terrain profile lines. However, the aim of the study was to evaluate the ef ficiency of Cad Earth software in the leasing of terraced structures. An area of 16751.50 m², originated from Latossolo, was mapped with the aid of a topographic GPS and adopted to its coordinates in the Cad Earth software, the Datum SIRGAS 2000 / UTM Zo na 23S for the geo referencing of the area. The horizontal and vertical distance between the terraces was calculated according to the methodology of Bertolini & Cogo (1996). From the georeferenced map, the altimetric mesh was enabled and the level curves i n the Cad Earth software were adopted according to the calculated vertical distance (4 m). In the field, terraces with a height of 696 m and 692 m were located following a "point and reference line" methodology, using the planimetric map realized in Cad Ea rth, with angles and reference points. For the evaluation of the efficiency of the software, the reading with the Level of precision of the average wires of certain characteristic points of the terraces 696 m and 692 m located in the field were realized. T here was variation in the slopes and differences in level between the points of each terrace, however, the differences between maximum and minimum slope between the terraces showed an altimetric pattern.