Sometimes things will change

Geotiff format records sptial information as well as the spectral information in a single file. For example, EO1 hyperion remote sening data are saved as this format. Sometimes we find that the georeference of EO1 hyperion data is not accurate as we expect. The most case is that it offsets from the real location, so it needs to be moved to the accurate place without changing map projection. Registration the geotiff file is one approach to fix the problem, but it requires accurate ground control points, and also may induce errors into the original data due to the second projection. Here I introduce how to shift the geotiff’s coordinates directly through modifing its metadata.

Visit geotiff official website and download a GUI software which is able to read and write geotiff metadata.
(1) Read the metadata into a txt file.
(2) Open the txt file with Notepad, and you can see the Tagged_Information and corner coordinates. Modify the numbers you want. For example, if map projection is UTM 15 zone, then the upper left corner coordinates are 635385.000 (Lon) and 3360015.000 (Lat). Increaing Lat number the map will shift to north and Lon number to the east. Similarly, decreasing the corresponding numbers will shift to the south and the west, respectively.
(3) Write the text file into the orignal geotiff image, and it will shift to new location you want.

#include <stdio.h>
#include <stdlib.h>
 int main(void)
{
  printf(”Hello, world\n“);
  return EXIT_SUCCESS;
}

To see more languages, visit “Hello world!” project at
http://www2.latech.edu/~acm/HelloWorld.shtml