Howto use ArmA 3 Terrain Builder to import huge monster satellite texture / mask in smaller sized tile images.

Problem: You have 40960 x 40960 resolution satellite images and those are extremely tough to edit and import into terrain builder.
Solution: slice up the huge images to 4 smaller 20480 x 20480 pieces and import them one by one.

BTW If you want to test this, you can import same satellite image more than once, when you do it second time it shows up in layer manager → raster as “<filename> -1” name, second same image import appears as “<filename> -2” etc. Also you don't have to use large 20480 x 20480 image, you can take even 1024 res image and import that, you stretch it over the wanted area in terrain builder layer settings.

This example uses 40960 x 40960 satellite resolution, but you can use it to smaller sizes too (or larger I guess? heh). We assume your satellite tiles are 20480 x 20480 resolution and there are 4 of them to be joined as one 40960 resolution final satellite image.

Basically your tile resolution will be added to the easting / northing coordinates. Easting by default is 200000 so you add 40960 to it which comes to 240960 value. Northing is bit easier as its zero, you simply add your tile size as-is there where necessary.

Satellite Mask

1. file → import → satellite mask, choose your bottom left corner tile
2. type easting: 200000, northing 0 and 40960 as size
3. file → import → satellite mask, choose your bottom right corner tile
4. type easting: 240960, northing 0 and 40960 as size
5. file → import → satellite mask, choose your top left corner tile
6. type easting: 200000, northing 40960 and 40960 as size
7. file → import → satellite mask, choose your top right corner tile
8. type easting: 240960, northing 0 and 40960 as size

Satellite Texture

1. file → import → satellite image, choose your bottom left corner tile
2. type easting: 200000, northing 0 and 40960 as size
3. file → import → satellite image, choose your bottom right corner tile
4. type easting: 240960, northing 0 and 40960 as size
5. file → import → satellite image, choose your top left corner tile
6. type easting: 200000, northing 40960 and 40960 as size
7. file → import → satellite image, choose your top right corner tile
8. type easting: 240960, northing 40960 and 40960 as size