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Eric E Palmer edited this page Oct 23, 2026 · 1 revision

surface_imager

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. (!) This code was developed for the Mercator Project (LASER Program). The code uses Gaskell's basic infrastructure and data files.

Description

surface_imager takes a bigmap and generates a surface image as if you are standing on (or near) the surface. It is designed to have a 100mm focal length lens and generate a 1024x1024 image.

Input Files

  • none

Input stdin

  • Bigmap name
  • Location of the point of view (x, y, z). X and Y are pixel positions within the map. Z is in meters above the surface.
  • Direction that you are looking (azimuth and elevation - in degrees). Zero azimuth is looking due north. Zero elevation is looking at the horizon.
  • Sun position (azimuth and elevation - in degrees). Zero azimuth has the Sun due north. 90 elevation is the Sun straight up.

Here's a sample input:

{{{ 123456 1733 1393 10 90, 0 60, 30 <- low sun angle

}}}

Output

  • IMAGE.pgm - The output image. Normally, it is 1024x1024 of the field of view (about 24 degrees square).

CategoryPrograms CategoryMercator

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