metric in jgw

[Emil Persson]

Standard definition

• Line 1: length of a pixel in the x direction (horizontal)
• Line 2: angle of rotation (is usually 0 or ignored)
• Line 3: angle of rotation (is usually 0 or ignored)
• Line 4: negative length of a pixel in the y direction (vertical)
• Line 5: x coordinate at the center of the pixel in the top left corner of the image
• Line 6: y coordinate at the center of the pixel in the top left corner of the image

Exported jgw from map.army

0.0000044592292941606866
0
0
-0.0000023768476109421204
14.283600636748986
57.79152388992712

I wonder what metric line 1 and 4 is in your JGW/PGW exports. And how and if i can convert it to Pixels per meter

[www.map.army]

Hi,

thank you for your message and great to hear that you are using https://www.map.army.

The new optional JGW and PGW exports are in an experimental state. We do follow the definition found on wikipedia: https://en.wikipedia.org/wiki/World_file

Regarding your question on the unit line 1 and 4:
The units of the numbers are WGS84 degree / pixel. So, the matrix transforms point on image into a point of WGS84 space.

Please do not hesitate to contact us should you have further questions on https://www.map.army.

Best Regards
Martin from the map.army team