diff --git a/CMakeLists.txt b/CMakeLists.txt
index 07f31aa..4367b9c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -5,7 +5,7 @@ project(
 find_package(GDAL CONFIG REQUIRED)
 
 add_executable(${PROJECT_NAME}
-	src/HeightMap.cpp src/CaseMap.cpp src/main.cpp
+	src/HeightMap.cpp src/CellMap.cpp src/main.cpp
 )
 find_package(OpenMP)
 if(OpenMP_CXX_FOUND)
diff --git a/src/CaseMap.hh b/src/CaseMap.hh
deleted file mode 100644
index e0a5a59..0000000
--- a/src/CaseMap.hh
+++ /dev/null
@@ -1,17 +0,0 @@
-#include <gdal/ogr_spatialref.h>
-#include <ogr_spatialref.h>
-#include <cstdint>
-/**
-    @brief stores the cases from marching squars for one elevation level
- */
-class CaseMap
-{
-    public:
-        uint8_t* cases; //!< pointer to the first case in the array. uint8_t is a 8 bit unsigned integer 
-        int width; //!< width of image in cases
-        int height; //!< height of image in cases
-        OGRSpatialReference reference_system;
-
-        CaseMap(int width, int height, uint8_t* cases, OGRSpatialReference reference_system);
-        int get_case(int x,int y);
-};
\ No newline at end of file
diff --git a/src/CaseMap.cpp b/src/CellMap.cpp
similarity index 51%
rename from src/CaseMap.cpp
rename to src/CellMap.cpp
index cc23b86..0284b7c 100644
--- a/src/CaseMap.cpp
+++ b/src/CellMap.cpp
@@ -1,19 +1,20 @@
 #include <cstdint>
 #include <gdal/ogr_spatialref.h>
 #include <ogr_spatialref.h>
-#include "CaseMap.hh"
+#include "contour_creator.hh"
 
-CaseMap::CaseMap(int width, int height, uint8_t* cases, OGRSpatialReference reference_system)
+
+CellMap::CellMap(int width, int height, uint8_t* cells, OGRSpatialReference reference_system)
 {
     this->width = width;
     this->height = height;
-    this->cases = cases;
+    this->cells = cells;
     this->reference_system = reference_system;
 
 }
-int CaseMap::get_case(int x, int y)
+int CellMap::get_cell(int x, int y)
 {
-    // all the cases are in an array of ints from left to right, top to bottom
+    // all the cells are in an array of ints from left to right, top to bottom
     int offset = ((this->width * y) + x);
-    return *(this->cases + offset);
+    return *(this->cells + offset);
 }
\ No newline at end of file
diff --git a/src/HeightMap.cpp b/src/HeightMap.cpp
index d2455e1..c8d7567 100644
--- a/src/HeightMap.cpp
+++ b/src/HeightMap.cpp
@@ -5,7 +5,8 @@
 #include "gdal/gdal_priv.h"
 #include <gdal/gdal_frmts.h>
 
-#include "HeightMap.hh"
+#include "contour_creator.hh"
+
 
 HeightMap::HeightMap(const char* filepath) 
 {
@@ -42,4 +43,4 @@ float HeightMap::get_pixel(int x, int y)
     int offset = ((this->width * y) + x);
     //std::cout << "  offset: " << offset << " " << x << ","<< y;
     return *(this->data + offset);
-} 
+}
\ No newline at end of file
diff --git a/src/HeightMap.hh b/src/HeightMap.hh
deleted file mode 100644
index 94d2112..0000000
--- a/src/HeightMap.hh
+++ /dev/null
@@ -1,17 +0,0 @@
-#include <gdal/ogr_spatialref.h>
-/**
-    @brief stores the contents of a tif file with float32 values
- */
-class HeightMap
-{
-    public:
-        float* data;
-        int width; //!< width of image in pixels
-        int height; //!< height of image in pixels
-        float min; //!< Minimum value in image
-        float max; //!< Maximum value in image
-        OGRSpatialReference reference_system;
-
-        HeightMap(const char* filepath);
-        float get_pixel(int x,int y);
-};
\ No newline at end of file
diff --git a/src/contour_creator.hh b/src/contour_creator.hh
new file mode 100644
index 0000000..f9ca8b7
--- /dev/null
+++ b/src/contour_creator.hh
@@ -0,0 +1,35 @@
+#include <gdal/ogr_spatialref.h>
+#include <gdal/ogr_spatialref.h>
+#include <ogr_spatialref.h>
+
+/**
+    @brief stores the contents of a tif file with float32 values
+ */
+class HeightMap
+{
+    public:
+        float* data;
+        int width; //!< width of image in pixels
+        int height; //!< height of image in pixels
+        float min; //!< Minimum value in image
+        float max; //!< Maximum value in image
+        OGRSpatialReference reference_system;
+
+        HeightMap(const char* filepath);
+        float get_pixel(int x,int y);
+};
+
+/**
+    @brief stores the cells from marching squars for one elevation level
+ */
+class CellMap
+{
+    public:
+        uint8_t* cells; //!< pointer to the first cell in the array. uint8_t is a 8 bit unsigned integer 
+        int width; //!< width of image in cells
+        int height; //!< height of image in cells
+        OGRSpatialReference reference_system;
+
+        CellMap(int width, int height, uint8_t* cells, OGRSpatialReference reference_system);
+        int get_cell(int x,int y);
+};
\ No newline at end of file
diff --git a/src/main.cpp b/src/main.cpp
index c09b23a..cf980c1 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1,5 +1,4 @@
-#include "HeightMap.hh"
-#include "CaseMap.hh"
+#include "contour_creator.hh"
 #include <gdal/ogr_api.h>
 #include "ogrsf_frmts.h"
 #include <iostream>
@@ -11,10 +10,10 @@
 #include <gdal/gdal_frmts.h>
 #include <omp.h>
 
-CaseMap produce_casemap(HeightMap* heightmap, float z)
+CellMap produce_cellmap(HeightMap* heightmap, float z)
 {
     int length = (heightmap->width-1)*(heightmap->height-1);
-    uint8_t *cases = (uint8_t *) CPLMalloc(sizeof(uint8_t)*length);
+    uint8_t *cells = (uint8_t *) CPLMalloc(sizeof(uint8_t)*length);
     for (int i = 0; i<length; i++) {
         int y = i/(heightmap->width-1);
         int x = i%(heightmap->width-1);
@@ -22,37 +21,37 @@ CaseMap produce_casemap(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;
-        *(cases + i) = result;
+        *(cells + i) = result;
     }
     
-    return CaseMap(heightmap->width-1, heightmap->height-1, cases, heightmap->reference_system);
+    return CellMap(heightmap->width-1, heightmap->height-1, cells, heightmap->reference_system);
 
 
 }
 
-std::vector<CaseMap> vector_casemap(HeightMap* heightmap, int interval)
+std::vector<CellMap> vector_cellmap(HeightMap* heightmap, int interval)
 {
     int num_contours = (heightmap->max - heightmap->min)/interval;
-    std::vector<CaseMap> vector_contours;
-omp_set_num_threads(12);
+    std::vector<CellMap> vector_contours;
+    omp_set_num_threads(12);
 
-#pragma omp parallel
-{
-    std::vector<CaseMap> vec_private;
-    #pragma omp for
-    for (int i = 1; i <= num_contours; i++) 
+    #pragma omp parallel
     {
-        vec_private.push_back(produce_casemap(heightmap, heightmap->min + interval*i));
-        std::cout << "Execute thread " << omp_get_num_threads() << " ";
+        std::vector<CellMap> vec_private;
+        #pragma omp for
+        for (int i = 1; i <= num_contours; i++) 
+        {
+            vec_private.push_back(produce_cellmap(heightmap, heightmap->min + interval*i));
+            std::cout << "Execute thread " << omp_get_num_threads() << " ";
+        }
+        #pragma omp critical
+        vector_contours.insert(vector_contours.end(), vec_private.begin(), vec_private.end());
+
     }
-    #pragma omp critical
-    vector_contours.insert(vector_contours.end(), vec_private.begin(), vec_private.end());
-
-}
-    return vector_contours;
+        return vector_contours;
 }
 
-void write_output_file(std::vector<CaseMap> casemaps, const char *filepath)
+void write_output_file(std::vector<CellMap> cellmaps, const char *filepath)
 {
 
     const char *pszDriverName = "ESRI Shapefile";
@@ -78,7 +77,7 @@ void write_output_file(std::vector<CaseMap> casemaps, const char *filepath)
 
     OGRLayer *poLayer;
 
-    poLayer = poDS->CreateLayer( "contours", &(casemaps[0]).reference_system, wkbPoint, NULL );
+    poLayer = poDS->CreateLayer( "contours", &(cellmaps[0]).reference_system, wkbPoint, NULL );
     if( poLayer == NULL )
     {
         printf( "Layer creation failed.\n" );
@@ -94,25 +93,25 @@ void write_output_file(std::vector<CaseMap> casemaps, const char *filepath)
         printf( "Creating Name field failed.\n" );
         exit( 1 );
     }
-    for (int j = 0; j < casemaps.size(); j++)
+    for (int j = 0; j < cellmaps.size(); j++)
     {
-        CaseMap* casemap = &casemaps[j];
-        for (int i = 0; i<casemap->height*casemap->width; i++) {
-            if (*(casemap->cases + i) != 0 && *(casemap->cases + i) != 15)
+        CellMap* cellmap = &cellmaps[j];
+        for (int i = 0; i<cellmap->height*cellmap->width; i++) {
+            if (*(cellmap->cells + i) != 0 && *(cellmap->cells + i) != 15)
             {
-                int x_int = i%casemap->width;
-                int y_int = casemap->height*casemap->width - i/casemap->width;
+                int x_int = i%cellmap->width;
+                int y_int = cellmap->height*cellmap->width - i/cellmap->width;
                 double x = double(x_int);
                 double y = double(y_int);
 
                 OGRFeature *poFeature;
 
                 poFeature = OGRFeature::CreateFeature( poLayer->GetLayerDefn() );
-                poFeature->SetField( "Name", *(casemap->cases + i) );
+                poFeature->SetField( "Name", *(cellmap->cells + i) );
 
                 //OGRSpatialReference local;
 
-                //auto poCT = OGRCreateCoordinateTransformation( &local, &casemap->reference_system );
+                //auto poCT = OGRCreateCoordinateTransformation( &local, &cellmap->reference_system );
                 
                 /*
                 if( poCT == NULL || !poCT->Transform( 1, &x, &y ) )
@@ -138,7 +137,7 @@ void write_output_file(std::vector<CaseMap> casemaps, const char *filepath)
     GDALClose( poDS );
     /*
     OGRDataSourceH datasource = OGR_Dr_CreateDataSource(OGRGetDriverByName("GeoJSON"), "contour.geojson", new char*);
-    OGRSpatialReference reference_system = casemap->reference_system;
+    OGRSpatialReference reference_system = cellmap->reference_system;
     OGRLayerH layer = OGR_DS_CreateLayer(datasource, "contour", &reference_system, wkbLineString25D, new char*);
     
     auto feature = OGR_F_Create(OGR_L_GetLayerDefn(static_cast<OGRLayerH>(layer)));
@@ -155,20 +154,20 @@ int main(int argc, const char* argv[])
     std::cout << "x: " << map.width << "    y: " << map.height << "\n";
     std::cout << "max: " << map.max << "    min: " << map.min << "\n";
     
-    auto casemap = produce_casemap(&map, 40);
+    auto cellmap = produce_cellmap(&map, 40);
     /*
-    for (int y = 0; y < casemap.height; y++)
+    for (int y = 0; y < cellmap.height; y++)
     {
-        for (int x = 0; x < casemap.width; x++)
+        for (int x = 0; x < cellmap.width; x++)
         {
-            if (casemap.get_case(x, y) && casemap.get_case(x, y)!=15) {
-                std::cout << x << ","<< y << "=" << casemap.get_case(x, y) << " ";
+            if (cellmap.get_cell(x, y) && cellmap.get_cell(x, y)!=15) {
+                std::cout << x << ","<< y << "=" << cellmap.get_cell(x, y) << " ";
             }
         }
        //std::cout << "\n";
     }
     */
     
-    auto casemaps = vector_casemap(&map, 5);
-    write_output_file(casemaps, "out.shp");
+    auto cellmaps = vector_cellmap(&map, 5);
+    write_output_file(cellmaps, "out.shp");
 }
\ No newline at end of file