Target-based terrestrial laser scan registration extended by target orientation

In almost all projects, in which terrestrial laser scanning is used, the scans must be registered after the data acquisition. Despite more and more new and automated methods for registration, the classical target-based registration is still one of the standard procedures. The advantages are obvious: independence from the scan object, the geometric configuration can often be influenced and registration results are easy to interpret. When plane black-and-white targets are used, the algorithm for estimating the target center fits a plane through the scan of a target, anyway. This information about the plane orientation has remained unused so far. Hence, including this information in the registration does not require any additional effort in the scanning process. In this paper, we extend the target-based registration by the plane orientation. We describe the required methodology, analyze the benefits in terms of precision and reliability and discuss in which cases the extension is useful and brings a relevant advantage. Based on simulations and two case studies we find out that especially for registrations with bad geometric configurations the extension brings a big advantage. The extension enables registrations that are much more precise. These are also visible on the registered point clouds. Thus, only a methodological change in the target-based registration improves its results.

Kajian pengaruh faktor batuan terhadap fragmentasi batuan overburden hasil peledakan berdasarkan model Kuz-Ram

Distribusi fragmentasi hasil peledakan dipengaruhi oleh beberapa faktor ialah massa batuan, jenis bahan peledak, jumlah bahan peledak yang digunakan, deskripsi massa batuan didalam faktor batuan pada daerah penelitian yaitu powdery dan blocky. Penelitian ini berfokus pada pengaruh factor batuan terhadap fragmentasi hasil peledakan overburden.Metode yang digunakan pada penelitian ini adalah pengamatan secara langsung dilapangan untuk mendapatkan gambaran mengenai kondisi situasi aktual seperti keterdapatan rock mass description (RMD), joint plane spacing (JPS), joint plane orientation (JPO), specific gravity (SGI), hardness. Pada penelitian faktor batuan hanya nilai RQD yang memiliki pengaruh sangat besar dalam peledakan. Analisis faktor batuan terhadap fragmentasi batuan menggunakan perangkat lunak Split Desktop 2.0 untuk menghitung hasil fragmentasi aktual hasil peledakan sedangkan untuk teoritis menggunakan metode model Kuz-Ram. Berdasarkan kajian nilai rock quality designation terhadap fragmentasi batuan hasil peledakan didapatkan nilai fragmentasi 80 cm ≥ 80% dikatakan ideal, hasil fragmentasi pada 2 lokasi penelitian dengan kegiatan peledakan 6 kali ialah 93,61%, 87,68%, 90,91% (powdery) dan 72,68%, 74.56%, 76.04% (blocky) untuk perhitungan model Kuz-Ram. Jadi pada satu lokasi penelitian masih di jumpai hasil distribusi fragmentasi yang kurang bagus dengan ukuran saringan 80 cm ≤ 80%, yaitu pada deskripsi massa batuan blocky. Kata Kunci: factor batuan, fragmentasi batuan, hasil peledakan, massa batuan