Hi all, I'd like to ask who has experience with both SAGE2001 and GSLIB? SAGE2001 is a software application developed by Isaaks, the author of a book titled "An Intoductioin to Applied Geostatistics". It can detect the direction of anisotropy by brutal force. Attached is a screen shot of the model fitted by this application, which consists of 2 spherical structures, each having its own independent anisotropy defined. As you know, GSLIB's kriging programs make use of 3 ranges and 3 angles to define the anisotropy:
1. *aa_hmax:* the maximum horizontal range (Is this the major range?) 2. *aa_hmin:* the minimum horizontal range (Is this the median one?) 3. *aa_vert:* the vertical range (Is this the minor one and should it be shorter than the above two? GSLIB does not check the order of these 3 numbers.) 4. *ang1, ang2, ang3* Taking the first structure in the attached image as an example, could any of you having expertise in these 2 applications give me some guidance as to how the 3 ranges and 3 angles calculated by Sage are mapped to GSLIB's corresponding input parameters? Some software packages use major, median, and minor to denote the 3 ranges and requires that major > median > minor, different from GSLIB's definition for these 3 ranges. Many thanks in advance for your help! Regards, Yang
