ESRI grid is a grid based point format.
If common converter settings have coordinate minimum and maximum values defined, they are checked during reading. If the conversion contains some coordinate transformation, the minimum and maximum coordinate limits and possible line filtering file shouls be in final result coordinate system.
If the grid size id given, grid filtering is used. All points are read to lightweight point construct, ordered according coordinates and filtered so, that only one point is left to each square. Point height is either grid minimum, maximum or average.
Tolerance Z setting can be used for height tolerance. If point height differences withing grid square are larger, square is divided to smaller quarters until all point heights are inside given tolerance. Right side field of Grid size setting determines the minimum grid size. Squares smaller than that are not divided to quarters.
Simple test filtering, that reads rows and columns from the file with given interval.
Line filtering works with vector file containing breaklines and the fetch distance. The upper field contains the fetch distance and the lower field vector file, which should be in 3D binary format. Filtering checks all breaklines in the given file. If the line is closed area, points inside it are accepted. Otherwise points within given fetch distance from the line are accepted. If file name is given as * (asterisk), the active file in element list us used.
ncols 1250 nrows 1250 xllcorner 2442500.000 yllcorner 6797500.000 cellsize 2 NODATA_value -999.999 104.507 104.609 104.701 104.811 104.950 105.156 105.354 105.290 105.386 ... 107.927 107.919 107.862 107.790 107.784 107.653 107.053 106.055 104.942 ... 103.580 103.549 103.533 103.534 103.594 103.595 103.603 103.822 104.326 ... 104.294 104.375 104.489 104.585 104.623 104.467 103.936 103.202 102.427 ... 106.801 106.975 107.224 107.502 107.672 107.745 107.740 107.865 108.114 ... 102.181 101.992 101.833 101.709 101.614 101.519 101.333 101.173 101.103 ...
See also: Common special settings