= SIGMA.TXT = == Description == This text file is essentially a copy of the most recently made ICQ shape file [[SHAPE.TXT]] that includes an additional column of sigma values. '''SIGMA.TXT''' is made by [[densify]] and is located in the [[SHAPEFILES]]/ directory. Here is a sample '''SIGMA.TXT''' file: {{{ 512 0.00810 0.19764 0.13333 0.29844E-01 0.00871 0.19742 0.13360 0.28206E-01 0.00932 0.19721 0.13386 0.27425E-01 0.00994 0.19700 0.13414 0.27743E-01 0.01055 0.19677 0.13441 0.28415E-01 0.01116 0.19655 0.13466 0.31917E-01 0.01177 0.19633 0.13493 0.31631E-01 0.01239 0.19615 0.13521 0.28469E-01 0.01300 0.19594 0.13549 0.28856E-01 }}} The output values are: '''Line 1''' - Q (resolution). This gives the number of nodes for i and j. Multiple Q by 6 coordinate vector spaces to fill out the entire region. (!) Q*Q*6 is the total number of nodes, and line entries in this file. (!) A Q of 512 is the largest that we represent. It contains 1.5 million vertices and is 56 MB uncompressed. '''Lines 2 and following''' - The location of a vertex in i, j, k space (Cartesian coordinates). '''Column 1''' - Position in x '''Column 2''' - Position in y '''Column 3''' - Position in z '''Column 4''' - Sigma values - JRW edit: densify.f doesn't read INIT_LITHOS.TXT, and multiplies a value by 1000 right before writing out SIGMA.TXT, so I'm fairly confident that the units are always meters. ---------- ''(Compiled by TC)'' ''(Updated by JRW)'' CategoryFiles CategoryOutputFiles