2009-11-03 21:41:13 UTC
We are trying to grid various marine parameters contained in ordinary tab-separated tables. The records contain lat, lon and various usual ocean station parameters. There are missing values, ranging from a very few for common parameters (e.g. temperature) to very many for rarely measured quantities (e.g. neon). It is very inconvenient to strip out separate XYZ tables for each parameter, so we would like to grid directly from the entire tables. The table to points shape process goes quite smoothly. But when we try to grid, we find that if we have used -99999 for the missing values, then Saga does not recognize this as a "no data" cell, and proceeds to use the huge negative value in calculations. If we have used completely empty fields for missing values, then Saga calculates the value as zero. We've tried all the gridding algorithms, except kriging. Can anybody tell us what we're doing wrong, or what else we need to do?
