Petroglyph J27 Khatm Al Melaha, Kalba, Sharjah

Natural Version with Paint, Petroglyph J27 Khatm Al Melaha, Kalba, Sharjah. Strange Design, might be natural from rock breakage. Likely Neolithic or earlier. [Fossati 2019 Messages from the Past: Rock Art of the Al-Hajar Mountains (Oman)]. Khatm Al Melaha is an archaeological site on the coast of the Oman Sea near Kalba in Sharjah, UAE. It is one of the largest rock art sites in the UAE. Over 175 stones with petroglyphs were documented and close to 400 motifs were identified. Every rock with a glyph was given an ID number and a GPS coordinate. In total 25455 terrestrial photographs, 5244 drone photographs, 44 drone videos, and 182 GPS points (+/- 1cm) were done in a single day. Petroglyphs were identified using Radiance Scaling in Meshlab, materials lighting in Substance Painter, and by changing conditions in Sketchfab. Some carvings were completely invisible when viewing. Drawings were done only when a line could be identified using one of these techniques. Reality Capture and Substance Painter Source: Objaverse 1.0 / Sketchfab带彩绘的天然岩画（Petroglyph）J27，发现于阿联酋沙迦卡尔巴的哈特姆·阿尔·梅拉哈（Khatm Al Melaha）。其纹饰怪异，或由岩石自然破裂形成，年代大概率属于新石器时代或更早。[引自Fossati 2019年《来自过去的讯息：哈杰尔山脉岩画（阿曼）》] 哈特姆·阿尔·梅拉哈（Khatm Al Melaha）是阿联酋沙迦卡尔巴附近阿曼海沿岸的一处考古遗址，同时也是阿联酋境内规模最大的岩画遗址之一。 该遗址已记录超过175块带有岩画的石材，共识别出近400处纹饰。每一块带有刻画痕迹的岩石均被分配唯一编号与GPS坐标。单日累计完成25455张地面摄影照片、5244张无人机航拍照片、44段无人机航拍视频，以及182个精度为±1厘米的GPS测点。 岩画的识别借助MeshLab中的辐射缩放（Radiance Scaling）功能、Substance Painter的材质光照模拟功能，以及Sketchfab的环境参数调整功能实现。部分刻画痕迹在常规视角下完全不可见，仅当通过上述任一技术可识别出线条时，才会进行绘图记录。 Reality Capture与Substance Painter 数据集来源：Objaverse 1.0 / Sketchfab