documentclass[margin=1cm]{standalone}

usepackage{pgfplots}
usetikzlibrary{3d}

pgfplotsset{compat=1.14}

begin{document}
    begin{tikzpicture}

    begin{axis}[%
    enlargelimits=false,
    axis equal,
    scale only axis,
    nodes near coords={pgfmathprintnumberpgfplotspointmeta},
    every node near coord/.append style={xshift=0pt,yshift=-7pt, black, font=scriptsize},
    ytick=empty,
    xtick=empty
    ]

    addplot[
    matrix plot*,
    point meta=explicit]
    table[meta=C]{
        x y C
0 0 0.0
0 1 0.0
0 2 0.3

1 0 0.0
1 1 1.0
1 2 0.0

2 0 0.0
2 1 0.0
2 2 .7
    };
    end{axis}
    end{tikzpicture}
end{document}