使用 C 语言计算 TIFF 文件中的填挖方量

#include <stdio.h> #include <stdlib.h> #include <tiffio.h>

#define ROWS 327 #define COLS 486 #define PIXEL_SIZE 5

int main(int argc, char* argv[]) { TIFF *tif; float *data; uint32 width, height; uint16 bits_per_sample, samples_per_pixel; tsize_t strip_size; unsigned long long total_fill_volume = 0, total_cut_volume = 0; int i, j;

if (argc < 2) {
    fprintf(stderr, 'Usage: %s <input file>\n', argv[0]);
    exit(1);
}

tif = TIFFOpen(argv[1], 'r');
if (!tif) {
    fprintf(stderr, 'Error opening TIFF file\n');
    exit(1);
}

TIFFGetField(tif, TIFFTAG_IMAGEWIDTH, &width);
TIFFGetField(tif, TIFFTAG_IMAGELENGTH, &height);
TIFFGetField(tif, TIFFTAG_BITSPERSAMPLE, &bits_per_sample);
TIFFGetField(tif, TIFFTAG_SAMPLESPERPIXEL, &samples_per_pixel);

if (width != COLS || height != ROWS || bits_per_sample != 32 || samples_per_pixel != 1) {
    fprintf(stderr, 'Invalid TIFF format\n');
    exit(1);
}

strip_size = TIFFStripSize(tif);
data = (float*) _TIFFmalloc(strip_size);
if (!data) {
    fprintf(stderr, 'Error allocating memory\n');
    exit(1);
}

if (TIFFIsTiled(tif)) {
    fprintf(stderr, 'Can not read scanlines from a tiled image.\n');
    exit(1);
}

for (i = 0; i < height; i++) {
    TIFFReadScanline(tif, data, i, 0);
    for (j = 0; j < width; j++) {
        float elevation = data[j];
        if (elevation > 0) {
            total_fill_volume += (PIXEL_SIZE * PIXEL_SIZE * elevation);
        } else {
            total_cut_volume += (PIXEL_SIZE * PIXEL_SIZE * (-elevation));
        }
    }
}

printf('Total fill volume: %llu cubic meters\n', total_fill_volume);
printf('Total cut volume: %llu cubic meters\n', total_cut_volume);

_TIFFfree(data);
TIFFClose(tif);

return 0;

}