I am looking for a method/prog/library(java) to interpolate points from a shapefile to a grid (file). I have seen arcgis can do that but i am looking for something free.
More specific: i have shapefiles(256 or more files) with points, those points have a value of temperature. Now i want to make a file with the values of a grid converted out of this points. The interpolation method is not very important for this project. The grid would be something of 10x10.
I would like to do this in java and iterate over the files and convert them to grids. I presume there is a java library that can do this.