Why are some of the S-57 object classes separated into individual geometry layers (point, line, polygon)?
Answer – S-57 object classes contain multiple geometry types. For example, the WRECKS object class can contain point and polygon features. NOAA ENC Direct to GIS is built using ESRI’s ArcIMS software, which does not support multiple geometry types in individual layers. It is important to note that an S-57 object in NOAA ENC Direct to GIS can have point, line and polygon parts.
