Guadiana river delta bathymetry surveys from 1944 to 1992 (digitalization)

Digitalization of Guadiana river delta bathymetry. Data consists of vector points and lines (shapefile) with bathymetric values (z) as reference to Hydrographic Zero (Z.H.): 2 m bellow mean sea level, observed in Cascais tidal gauge, Portugal. It also has *.csv files (zxy) of the point data. Data was manually digitized from paper charts regarding the following surveys (month/year): ?/1944; may, june/1958; june/1967; may, june/1969; march, april/1973; april/1977; july/1982; april, may/1986; april/ 1988; july/august/ 1992. Original map scale is 1:5000. Digitalization o paper charts produced 0.67 m x 0.65 m cell size raster files. All data is projected to ESPG: 3763 (ETRS89 / Portugal TM06). Surveys were originally performed by Portuguese hydrographic authorities: Brigada Hidrográfica 4; MOPTC - DSF - DCME