[GRASS-git] [OSGeo/grass] 4807e8: i.evapo.mh: fix radiation conversion factor (#5600)

[Jayneel Shah]

  Branch: refs/heads/main
  Home:   https://github.com/OSGeo/grass
  Commit: 4807e8257ea54727ad513802b44566ba3833243d
      https://github.com/OSGeo/grass/commit/4807e8257ea54727ad513802b44566ba3833243d
  Author: Jayneel Shah <80264736+jayneel-shah18 at users.noreply.github.com>
  Date:   2025-04-29 (Tue, 29 Apr 2025)

  Changed paths:
    M imagery/i.evapo.mh/mh_eto.c
    M imagery/i.evapo.mh/mh_original.c
    M imagery/i.evapo.mh/mh_samani.c

  Log Message:
  -----------
  i.evapo.mh: fix radiation conversion factor (#5600)

Previously, the radiation input (ra) was multiplied by 86.4, incorrectly boosting the energy input and resulting in overestimated evapotranspiration values.

This PR corrects the unit conversion:

Changes ra = ra * (24.0 * 60.0 * 60.0 / 1000.0); to ra = ra * (24.0 * 60.0 * 60.0 / 1000000.0);
This matches the correct SI conversion where 1 W/m² = 0.0864 MJ/m²/day



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