I wonder if anyone here with a good knowledge of S57 format internals can help me out on this issue.
OGR S57 parser seems to work quite well with most charts in NOAA ENC data set. However, I found a feature on one of the charts that puzzles me (to be specific, the chart is US5CA92M, the feature RCID is 1167 in current chart edition). This is a polygon-based feature which is defined such that, as read by OGR, the outer polygon ring does not enclose inner rings (it is essentially "on the side"). The first inner ring is what you would consider the outer ring in OGR definition, if you were to visualize this polygon. This in turn causes all sorts of issues (in particular in any code that assumes the entire polygon to be enclosed in the outer ring). So, my question is - is it that S57 standard allows for multiple outer rings for polygons and so this is not handled in OGR because OGRPolygon is defined that way? Is it an error in S57 data, something that chart makers did? Or is it, perhaps, something in DDF encoding that is not read correctly by the iso8211 module? Any help on this would be appreciated. --Mike _______________________________________________ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
