Tepatnya resource modelling Pak Djuharlan, hex3. Pak Wahyudi, saya coba jawab sebisanya. Jawaban cepat pertanyaan Anda adl dengan grid (2D). Sebagai tambahan, resource modeling, apapun peranti lunak dan komoditas bahan galiannya, umumnya memperhatikan 3 hal berikut: 1. Algoritma (trend surface, kriging dan min curvature) 2. Data (jumlah data, pattern dan orientasinya) 3. Area pencarian (luasan, bentuk, orientasi, pembobotan/weighting) 4. Ukuran grid (ukuran cell, bentuk, orientasi)
Saran saya sebelum memulai pemodelan, pelajari saja dulu datanya sehubungan dgn poin2 di atas dan tools yg hrs digunakan sdh barang tentu geostatistik (spt yg dibilang Pak Djuharlan). Geostatistik adl alat/tools utk menentukan parameter2 yg digunakan dalam pemodelan di atas, misalnya apa algoritma yang cocok dipakai utk jumlah, pola dan data eksplorasi yg Anda punya, berapa besar ukuran dan bentuk grid yang optimum, dll. Untuk statistik deskriptif dari data yang Anda punya spt distribusi, rata2 aritmetik, histogram, sd, outliers, dll bisa pakai Excel saja tapi utk variogram setahu saya yg gratisan dan mudah digunakan cuma Variowin (googling saja, pasti ketemu). Kalau tdk salah di thn 2000 ada buku yang bagus dan praktis ttg hal ini, judul lengkapnya: Understanding Contouring: A Practical Guide to Spatial Estimation Using a Computer and Variogram Interpretation oleh Krajewski & Gibbs. Di dalamnya malah dilampirkan contoh-contoh "pseudo-features" kontur yg dihasilkan dari dataset yg sama namun menggunakan berbagai jenis metoda pemodelan. Ini berguna sekali utk novice resource modeller yg kadang bingung jika ketemu "bulls-eye": ini bener2 anomali atau salah memodel? Sayangnya punya saya sendiri sdh entah kemana nasibnya karena keseringan pindah-pindah tapi mungkin masih bisa Anda beli lewat Amazon. Dalam buku itu pengarangnya ada menulis demikian: "Explorationist conceive mineral deposits and contours in their minds and draw them with a hand guided by experience, data and aesthetics. Someday, computers will be programmed to do as well (Krajewski, 1984)." Semoga berguna dan silakan jika ada koreksi/tambahan. Salam, Noel On 25/07/07, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
Nah tuh, bahas lho masalah geostatistik ….. (kalau nggak salah). Regards/Salam, Md. Johaness Djuharlan - 003185 PT Freeport Indonesia Tembagapura 99930 "Keep Smile, makes your life easier" "Mangan ora mangan kumpul, kumpul karo mangan-mangan". Disclaimer: This email (including any attachments to it) is confidential, used for internal PTFI only. ________________________________ From: W. Adhiutomo [mailto:[EMAIL PROTECTED] Sent: Tuesday, July 24, 2007 10:54 PM To: iagi-net@iagi.or.id Subject: [iagi-net-l] Tentang Minscape... :-) Salam, Bapak-bapak, Ibu-ibu... Ada yang familiar dengan MIncom?? Aku mau nanya... Surface yang paling bagus untuk modeling geology apa ya?? Surface expression, grid, atau triangle... :-) Thanks. -- Regard, Wahyudi Adhiutomo Mobile: +62852 487 33499 Email: [EMAIL PROTECTED] ----- This email (including any attachments to it) is confidential and is sent for the personal attention of the intended recipient only and may contain information that is privileded, confidential or exempt from disclosure. If you have received this email in error, please advise us immediately and delete it. You are notified that using, disclosing, copying, distributing or taking any action in reliance on the contents of this information is strictly prohibited. -----
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