On the southwestern border of the motherland and on both sides of the Zuojiang River, there are steep rock walls formed by karst. On the cliffs, Luoyue people left their feat - Zuojiang Huashan Rock Painting .
Luo Yuexian used hematite as the base to make special pigments for drawing. has simple style, extensive brushstrokes, large scale, and magnificent scenes. The social life of two thousand years ago slowly unfolded in a scroll composed of thirty-eight rock paintings.
According to research, the painting era of Huashan rock painting can be traced back to in the fifth century BC. After hundreds of years of continuous improvement, it finally formed an amazing masterpiece.
In 2016, Huashan rock painting was rated as [ World Cultural Heritage ]. Everyone is wondering how this picture was painted, so high from the river, and the picture was sunken in the rock. What was the content of the painter's painting at that time? It was a religious sacrificial activity or a depiction of war scenes. There has been no conclusion yet on the discussion.
karst mountains are spectacular but also fragile. Natural weathering and erosion of flowing water are increasingly threatening the preservation of rock paintings. Thousands of years of wind and rain have caused many rock paintings to peel off, or are covered by stalactites . records and protection of Huashan rock paintings are imminent .
In 1985, an expert team copied the rock paintings and sat on the boat to find a small stool to depict them based on vision. Another way is to draw on Gaopi opposite the mural, because the hull sways with the waves, and Gaopi is very far from the rock paintings. The two methods of will inevitably produce errors .
△ Expedition team inspected
△ Expedition team artists were in Linmo rock painting images
With the development of drone close-up photogrammetry technology , surveying and mapping research on Huashan rock paintings and other monuments no longer requires surveying and mapping personnel to risk their lives to climb cliffs and cross mountains and ridges to find suitable observation perspectives.
△The inspection team is measuring rock paintings
. Now, we can record and store all of it through digitization, which is conducive to the restoration and repair of cultural relics in the future .
When the filming team came to the scene to conduct a three-dimensional surveying and mapping of Huashan rock paintings, the entire surveying and mapping of was divided into two steps:
The first step is that controls the drone to collect a rough terrain from it. This rough terrain is mainly collects certain overlapping photos manually, and finally modeling using modeling software.
With the help of efficient aerial survey of the drone, many mountain photos from different angles were collected in just ten minutes. used these high-definition images with spatial position information to synthesize these high-definition images through software to , and a rough Huashan digital three-dimensional model was born.
The second step in field aerial photography is to plan a refined modeled route based on this rough model. The route can also be set according to the concave or convex parts of the mountain.
Setting the route is completed and a new waypoint flight mission is created, and you can see the drone automatically perform the route and collect various data.
Import all data into cloud earth three-dimensional reconstruction cloud platform , and computers can complete automatic three-dimensional refined modeling.
users create high-precision digital archives on the cloud and earth, and clearly present the magnificent details of Huashan rock paintings.
not only helps with more efficient archive research, but also can measure the rock paintings and mountain structures to analyze cultural heritage protection plans in a targeted manner.
