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NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
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Hi Mark- > > The problem is that your latitudes change direction at the 52 point: > I am guessing you meant longitude. No, I meant latitude (second number). Notice that before point 51 the values are increasing, but then they start decreasing. > > > > [48]: 18.218628,-87.33871,5673.8726 > > [49]: 12.376205,-87.41195,5656.7305 > > [50]: 6.261139,-87.45691,5609.3237 > > [51]: 0.0,-87.47207,5539.839 > > [52]: -6.261139,-87.45691,5506.035 > > [53]: -12.376221,-87.41195,5472.393 > > [54]: -18.218628,-87.33871,5419.2974 > Yes, these values are correct and they make sense. > > > where I would expect them to change at the 103 point since yc is > > dimensioned to be 102. Am I missreading that? Is this an artifact > > of the pole? > > It is not as much as it is changing direction at point 52 as it is > crossing the prime meridian at this location (further up in the data it > crosses the dateline at point 52). I have attached an image which shows > the projection from this dataset with the map and lat/lon lines. The image didn't come through, could you resend. I understand the crossing of the prime meridian - it's the change in latitude direction that I don't understand. Perhaps he picture will make it clearer. > I am not certain as to why one would expect the longitude direction to > change at the 103 point. Well, not change direction so much as start over at the first longitude again. Same with latitude. Don Ticket Details =================== Ticket ID: XWV-899527 Department: Support IDV Priority: Normal Status: Open