Elie at 04:53, 31 August 2022

2022-08-31T04:53:56Z

← Older revision		Revision as of 00:53, 31 August 2022
Line 3:		Line 3:
	Output: [[:File:countries.data-int16-8640x4320]]		Output: [[:File:countries.data-int16-8640x4320]]

	Dependencies: [[~~:File~~:stb_image_write.h]]		Dependencies: [[Code:stb_image_write.h]]

			==Code==
	<syntaxhighlight lang="c">		<syntaxhighlight lang="c">
	// Converts NASA GPWv4 data (country indicator) from ASCII format to binary data (64-bit double-precision floating point 2D array)		// Converts NASA GPWv4 data (country indicator) from ASCII format to binary data (64-bit double-precision floating point 2D array)

Elie: Created page with "Input: gpw_v4_national_identifier_grid_rev11_2pt5_min.asc, extracted from :File:gpw-v4-population-count-rev11_2020_2pt5_min_asc.zip Output: :File:countries.data-int16-8640x4320 Dependencies: :File:stb_image_write.h // Converts NASA GPWv4 data (country indicator) from ASCII format to binary data (64-bit double-precision floating point 2D array) // To compile: gcc convert-nasa-countries.c -O -o convert-nasa-countries #define IN_F..."

2022-08-31T04:45:47Z

Created page with "Input: gpw_v4_national_identifier_grid_rev11_2pt5_min.asc, extracted from File:gpw-v4-population-count-rev11_2020_2pt5_min_asc.zip Output: File:countries.data-int16-8640x4320 Dependencies: File:stb_image_write.h <syntaxhighlight lang="c"> // Converts NASA GPWv4 data (country indicator) from ASCII format to binary data (64-bit double-precision floating point 2D array) // To compile: gcc convert-nasa-countries.c -O -o convert-nasa-countries #define IN_F..."

New page

Input: gpw_v4_national_identifier_grid_rev11_2pt5_min.asc, extracted from [[:File:gpw-v4-population-count-rev11_2020_2pt5_min_asc.zip]]

Output: [[:File:countries.data-int16-8640x4320]]

Dependencies: [[:File:stb_image_write.h]]

<syntaxhighlight lang="c">
// Converts NASA GPWv4 data (country indicator) from ASCII format to binary data (64-bit double-precision floating point 2D array)
// To compile: gcc convert-nasa-countries.c -O -o convert-nasa-countries

#define IN_FILE "data/gpw_v4_national_identifier_grid_rev11_2pt5_min.asc"
#define OUT_FILE "data/countries.data-int16-8640x4320"
#define INPUT_ASCII_DATA_START 131
#define INPUT_WIDTH 8640
#define INPUT_HEIGHT 4320

#include <stdio.h>

int main() {
FILE* in = fopen(IN_FILE, "r");
if (in == NULL) {
perror(IN_FILE);
return 1;
}
if (fseek(in, INPUT_ASCII_DATA_START, SEEK_SET)) {
perror(IN_FILE);
return 2;
}
FILE* out = fopen(OUT_FILE, "w");
if (out == NULL) {
perror(OUT_FILE);
return 3;
}
printf("Input: %s\nOutput: %s\n",IN_FILE,OUT_FILE);
int n=0;
int value=0;
while (!feof(in)) {
if (fscanf(in, "%d", &value) == 0) break;
if (!n) printf("%d\n",value);
if (fwrite(&value, sizeof(short), 1, out) == 0) break;
++n; if (!(n & 524288)) printf("wrote %d MiB\n", (n>>19));
}
fclose(in);
fclose(out);
printf("wrote %d numbers to %s\n", n, OUT_FILE);
return 0;
}
</syntaxhighlight>

Code:convert-nasa-countries.c - Revision history

Elie at 04:53, 31 August 2022