diff --git a/src/main.cpp b/src/main.cpp
index 824e1a0..bf2fc46 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -17,6 +17,7 @@ CellMap produce_cellmap(HeightMap* heightmap, float z)
 {
     int length = (heightmap->width-1)*(heightmap->height-1);
     uint8_t *cells = (uint8_t *) CPLMalloc(sizeof(uint8_t)*length);
+    std::vector<Point> points;
     for (int i = 0; i<length; i++) {
         int y = i/(heightmap->width-1);
         int x = i%(heightmap->width-1);
@@ -24,7 +25,10 @@ CellMap produce_cellmap(HeightMap* heightmap, float z)
         (heightmap->get_pixel(x+1,y)>z)*2 +
         (heightmap->get_pixel(x+1,y+1)>z)*4 +
         (heightmap->get_pixel(x,y+1)>z)*8;
-        *(cells + i) = result;
+        if (result != 0 and result != 15 ) {
+            points.push_back(Point(x, y, result));
+            
+        };
     }
     
     return CellMap(heightmap->width-1, heightmap->height-1, cells, heightmap->reference_system, heightmap->geotransform);
@@ -180,5 +184,5 @@ int main(int argc, const char* argv[])
     auto cellmap = produce_cellmap(&map, 40);
     
     auto cellmaps = vector_cellmap(&map, 5);
-    write_output_file(cellmaps, "out.geojson");
+    //write_output_file(cellmaps, "out.geojson");
 }
\ No newline at end of file