A 2D Terrain Forward Modeling and Correction Method

Abstract

The invention provides a two-dimensional landform forward modeling and correcting method. During drawing of a apparent resistivity equivalent sectional drawing, coordinate point data acquisition of a homogeneous medium landform and coordinate point data acquisition of a heterogeneous medium landform are carried out to acquire resistivity values thereof, and an apparent resistivity equivalent sectional drawing of a pure landform section is drawn by forward modeling and correcting, The position, the form, and the number of the abnormal apparent resistivity of the landform section having uniform ups and downs are calculated correctly, and the false abnormity of the ups and downs of the landform formed in the section is displayed objectively, and then direct data operation is carried out, and therefore technical problems and troubles caused by production of conductive paper, resistive networks, water channels, and soil channels according to a certain proportion to simulate field conditions are eliminated, and at the same time, occasional errors caused by manual operation are eliminated.

Description

technical field [0001] The invention relates to a two-dimensional terrain forward modeling and correction method, belonging to the technical field of geographic information systems. Background technique [0002] "Arbitrarily symmetrical quadrupole devices for conventional direct current method (including the same device for high-density electric method)" are more and more widely used in mineral geology, hydrogeology, engineering geology and other fields. The interpretation of apparent resistivity data is in the horizontal (or monoclinic) in half space. However, there are various undulations in the actual terrain. Theory and practice show that the terrain can not only cause false anomalies, but also cover up the real anomalies caused by ore bodies or target geological bodies underground. If the data is processed and interpreted according to the horizontal (or monoclinic) terrain, it will inevitably cause certain errors, and even lead to completely wrong results. Misleading ...

AI Technical Summary

Problems solved by technology

These practices are basically qualitative explanations and cannot fundamentally solve the problem

[0004] Later, some scholars used some analytical calculation methods to study the influence of terrain, and some inversion software also developed the terrain correction function, but based on the principle, it is based on the distribution of the terrain to the static current, and the normal shape is corrected according to the terrain, which is not a real sense. Terrain correction does not make any changes to the magnitude of the resistivity value affected by the terrain, but only changes the shape of the anomaly, which does not achieve the purpose of real terrain correction in essence, and the results of the apparent resistivity anomaly obtained are not the objective existence of geological bodies. Rather, it cannot qualitatively, semi-quantitatively, or quantitatively judge and explain abnormalities

Images