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CMakeLists.txt

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+project(inf205 CXX)
+cmake_minimum_required(VERSION 3.0)
+
+find_package(GDAL CONFIG REQUIRED)
+
+set(EXAMPLE_NAME read_tiff)
+add_executable(${EXAMPLE_NAME}
+	read_tiff.cpp
+)
+
+
+target_link_libraries(${EXAMPLE_NAME} GDAL::GDAL)

read_tiff.cpp

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+#include <array>
+#include <cstddef>
+#include <gdal/gdal.h>
+#include "gdal/gdal_priv.h"
+
+#include <errno.h>
+#include <iostream>
+#include <iterator>
+
+#include <stdfloat>
+#include <thread>
+#include <vector>
+/*
+class HeightMap
+{
+    public:
+        float* data;
+        int x_size;
+        int y_size;
+
+        HeightMap(int x_size, int y_size);
+};
+
+HeightMap::HeightMap(int x_size, int y_size, char* filepath) {
+    this->x_size = x_size;
+    this->y_size = y_size;
+    this->data = (float *) CPLMalloc(sizeof(GDT_Float32)*x_size*y_size);
+
+
+}
+*/
+int main(int argc, const char* argv[])
+{
+    if (argc != 2) {
+        return EINVAL;
+    }
+    const char* pszFilename = argv[1];
+
+    GDALDatasetUniquePtr poDataset;
+    GDALAllRegister();
+    const GDALAccess eAccess = GA_ReadOnly;
+    poDataset = GDALDatasetUniquePtr(GDALDataset::FromHandle(GDALOpen( pszFilename, eAccess )));
+    if( !poDataset )
+    {
+        std::cout << "Error :/"; // handle error
+    }
+    std::cout << poDataset->GetDriverName();
+    
+
+    double        adfGeoTransform[6];
+    printf( "Driver: %s/%s\n",
+            poDataset->GetDriver()->GetDescription(),
+            poDataset->GetDriver()->GetMetadataItem( GDAL_DMD_LONGNAME ) );
+    printf( "Size is %dx%dx%d\n",
+            poDataset->GetRasterXSize(), poDataset->GetRasterYSize(),
+            poDataset->GetRasterCount() );
+    if( poDataset->GetProjectionRef()  != NULL )
+        printf( "Projection is `%s'\n", poDataset->GetProjectionRef() );
+    if( poDataset->GetGeoTransform( adfGeoTransform ) == CE_None )
+    {
+        printf( "Origin = (%.6f,%.6f)\n",
+                adfGeoTransform[0], adfGeoTransform[3] );
+        printf( "Pixel Size = (%.6f,%.6f)\n",
+                adfGeoTransform[1], adfGeoTransform[5] );
+    }
+
+    float *buffer;
+    auto poBand = poDataset->GetBands()[0];
+    
+    int x_size = poBand->GetXSize();
+    int y_size = poBand->GetYSize();
+
+
+    buffer = (float *) CPLMalloc(sizeof(GDT_Float32)*x_size*y_size);
+    poBand->RasterIO( GF_Read, 0, 0, x_size, y_size,
+                    buffer, x_size, y_size, GDT_Float32,
+                    0, 0 );
+    
+    for (int i = 0; i < x_size*y_size; i++)
+    {
+        buffer+=sizeof(GDT_Float32);
+        if (*buffer)
+        {
+        std::cout << *buffer<<"  "<<i<<"\n";
+        }
+    }
+    std::cout << "🤡"<<*buffer;
+}