converting tiff from ascii

I have rainfall data in

lat lon Rainfall
34.67 87.56  79
34.68 87.56  90
Now I want to convert it in .tiff image format.How can I do this.

Answer 1

[Image Analyst]

Loop over lat and lon and convert them into a row or column, then assign the value, maybe like

maxCols = ceil(max(100 * lon));
maxRows = ceil(max(100 * lat));
rainfallImage = zeros(maxRows, maxCols, 'uint8');
for k = 1 : length(lat)
    col = round(100 * lon(k));
    row = round(100 * lat(k));
    rainfallImage(row, col) = Rainfall(k);
end
imshow(rainfallImage, []);
colormap(hot(256));
colorbar;
imwrite(rainfallImage, 'RainFallImage.tif');