New Post: Convert shapefile to raster

Hi,

try to pass also the extent.

If you download dotspatial sources and open the vectortoraster.cs file you find the following code in the toraster method:

        public static IRaster ToRaster(IFeatureSet fs, Extent extent, double cellSize, string fieldName,
                                       string outputFileName,
                                       string driverCode, string[] options, IProgressHandler progressHandler)
        {
            Extent env = extent;
            if (cellSize == 0)
            {
                if (env.Width < env.Height)
                {
                    cellSize = env.Width / 256;
                }
                else
                {
                    cellSize = env.Height / 256;
                }
            }
            int w = (int)Math.Ceiling(env.Width / cellSize);
            if (w > 8000)
            {
                w = 8000;
                cellSize = env.Width / 8000;
            }
            int h = (int)Math.Ceiling(env.Height / cellSize);
            if (h > 8000)
            {
                h = 8000;
            }
           ......

you should test the following instructions to understand if the Toraster method will return to you the results you are looking for:

int w = (int)Math.Ceiling(env.Width / cellSize);
int h = (int)Math.Ceiling(env.Height / cellSize);

I didn't test it but I guess that
since your envelope height and width might be not a multiple of the cellsize you specified, it might turn out that the newly created raster will not have the discretization you want.

Have a look into the ToRaster method and see what it does to understand it. The cellsize is never used after the evaluation of w and h, hence I guess that the output raster cellsize is re-evaluated from w,h and the envelope.

A simple test would be to pass an envelope which has a width and height exactly multiple of the cellsize you want. Then the results should be what you are looking for.

Hope I've been clear

Oscar