I'm using QGIS 3.4.1, and I used Openlayers plugin to download several maps of my interest, and downloaded SRTM data and added as a raster layer. They are all aligned based on same CRS reference. Now, there are multiple different layers of maps and one raster layer in my project.
Here is the list of what I wish to do:
- I wish to print the square map of exactly 61.440km x 61.440km (61440m x 61440m) area of my choice.
- While printing, I wish to have 2048 pixel x 2048 pixel quality, this will give the map 1 pixel per 30m. Then print to 24bit bmp format file.
- I wish to get the 4 longitude / latitude coordinates for the 4 corner point of square map above.
Following is my question:
A. Regarding question 1&2, I'm trying to use "print composer". How can I only print 61.440km x 61.440km area of my interest from print composer?
I know that I can set "Item Properties" => "Extents", and set X min/max, Y min/max coordinate, but I don't know how to set those extent numbers to become 61.44km.
What are the formula or equation?
Or, are there any other good methods instead of using "Extents"?
B. What DPI setting should be chosen for 1 pixel per 30m?