Feature Groups Surface Tools series of tools for creating surfaces (Grids) from polyline and point data, converting Grids to contour polylines, building Thiessen polygons, and extracting values and zonal statistics from rasters Build Thiessen Polygons Builds Thiessen polygons from point features. Extract Raster Values Extracts input raster values at existing points as points attributes. Extract Raster Zonal Statistics Extracts statistics from raster datasets at zones defined by selected polygons. Density Calculates density rasters for point and polyline features in specified neighborhood. Convert Grid to Contours Converts raster data models (grids) to contour polyline features (relief isolines, for example) with specified parameters. Create Grid from Contours Creates grids from contour polylines. Create Grid from Points Creates grids from point data interpolating input points by values from selected attribute field.