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

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