en Specific documentation Technical and coding aspects Projections, grids and model resolutions ? | OPML ? The rotated/tilted Mercator geometry is introduced. The associated computations are developed. These computations involve formulae for : the direct geometric transform, the reverse geometric transform, the quantities associated to Coriolis force, the map factor, the transformation of (…) Projections used in ALADIN & AROME limited area models (LAM): Generality & description of the code (access to French version, pour version française) This document describes the Fortran package for the management of the “geometry” of the ALADIN & AROME LAM. This “geometry” is a (…) Map of ARPEGE horizontal resolution (in km) Truncature T358C2.4 T538C2.4 T799C2.4 for the whole sphere zoomed over Europe Vertical levels cast in Pressure coordinates for all the atmosphere zoom at the tropopause 46 versus 60 levels 46 versus 70 levels (…) This document explains the new projection routines with an emphasis on bugfixes at the level of Cycle 29.t2 to 30.t1. It explains : the new ‘cadre’ for ALADIN files, use of NCADFORM key, in depth description of parameter setup and checks in sufpg1, … Both English and French documentions (…) Projections in ALADIN by Jean-Daniel Gril, June 2002 : the different projections in ALADIN : secantes, tangentes, stereographic, polaire, … the formulae Annex : Lambert(1) and Lambert(2) This procedure ‘surgery’ is determining the number of longitudes for each latitude of a gaussian reduced grid, defined by : the number of latitudes NDGL, the maximum number of longitudes NDLON, the truncation NSMAX. The job is split in 2 parts : first part is the computation of the (…) This procedure defines the two corners (SW and NE) of a subgrid Aladin, given : the native grid parameters, the approximative SW subgrid corner (in degrees) : ZLONU & ZLATU the number of points of the subgrid (for C+I) : IDLUXU & IDGUXU The files location is on andante: (…) Source.