Remote sensing interpretation steps

Conventional interpretation steps are divided into three stages: initial interpretation, intermediate interpretation and final interpretation. At each stage, we should set special purposes and tasks, and establish a working idea from the outside to the inside and from the shallow to the deep. First of all, we should implement the idea of remote sensing geology, and we should not let remote sensing interpretation become a mere formality.

1. Preliminary translation

Using the newly synthesized remote sensing image to interpret the existing geological data, we can be familiar with and master the relationship between remote sensing image and basic geological structure. When there is a big discrepancy between the remote sensing image and the geological data, the contradiction will be reserved and left for on-site processing. At this time, it is necessary to provide the optimized position of measured geological (especially stratigraphic) profile, the selection of reconnaissance route and the suggestions on the setting of geological and mineral survey route, so as to provide important information for geophysical and geochemical exploration scanning surface as much as possible and realize rapid prospecting. In the orogenic belt with complex geological structure and poor topography, the application of remote sensing information to profile selection has achieved results that are difficult to obtain by conventional geological methods. For example, the selection of Carboniferous-Permian section, Kuusla-Jurassic section and Kalan-Gu Ni-Permian section in Qialong County is relatively successful, which provides a shortcut for systematic stratigraphic research. For example, the change of ore-bearing strata in Kalangu lead-zinc mine from the original Lower Carboniferous (or Upper Devonian-Carboniferous) to the Middle Devonian was first proposed by remote sensing information, and was confirmed by profile investigation and paleontological fossils.

2. Intermediate interpretation

This work is carried out simultaneously with field geological profile survey and route geological survey. Firstly, the division marks of lithostratigraphic units are established by comparing the measured stratigraphic sections, the identification marks of rock mass boundaries and alteration zones are established by combining magmatic rock sections, and the structural marks of folds and faults are established by combining route geological survey and tectonic geological sections. The prospecting criteria can also be determined from the structural poles in satellite images and mine engineering image data. In snow-covered mountainous areas and mountainous areas that people can't cross, in order to reduce geological gaps, remote sensing interpretation survey points or remote sensing geological survey routes are set up. The compilation of geological maps and mineral maps and remote sensing geological mapping are brought into synchronous orbit, which effectively improves the mapping quality of geological maps.

3. Final explanation

Entering the stage of indoor report writing, remote sensing geological research closely cooperates with strata, magmatic rocks, structures, geophysical and geochemical exploration and geological mapping. Infiltrate remote sensing geological information into the compilation of reports, systematically fill in and improve remote sensing geological observation record cards, and complete the compilation of remote sensing interpretation geological maps and reports.