Many to one relationship with the MapCat table. Contains one record for EACH StreamNet subbasin (circa 1990) represented on the plot.
| Field Name | Field Description | Data Type | Field Size* | MapID | The map or image ID, foreign key to table MapCat | int | 4 | Subbasin1990ID | Subbasin code defined in 1990 by NPCC | smallint | 2 | RankID | The rank describing the geographic scope of Map relative to Subbasin1990. | tinyint | 1 |
*The text datatype pre-allocates only 16 bytes. Size represents actual bytes for all other data types.