COMPARISON BETWEEN ALTIMETRIC SURVEY METHODS FOR SYSTEMATIZATION OF LANDS FOR IRRIGATION AND DRAINAGE - DOI: 10.7127/rbai.v11n500749

Resumo

The systematization of the terrain is a set of operations necessary to regularize the irregular surface of a terrain in uniform slopes in one or two directions. It is one of the most costly and indispensable techniques in surface irrigation. In this sense, the objective was to compare the obtaining of quotas, with different methods of altimetric survey to systematize the terrain of four different areas located in the Sertão do Pajeú - PE. The standard method was hose leveling (HL) and was correlated with the geometric (GL), tachometric (TACL), trigonometric (TRL) and GNSS receiver (GNSSL) leveling. The comparison of the results was by means of the standard error of estimation (SES), maximum error (MAXE), Willmott concordance index (d), Pearson correlation coefficient (r) and coefficient of confidence (c). The results of the assessment of the estimates of the (TRL), (TAL) and (GL) indicate, in this order, a better adjustment and are well correlated to (HL), whereas the (NGNSL) did not present satisfactory adjustment, thus, it is not recommended to obtain quotas for systematization of the land.