# Projections, grids and model resolutions

## Articles in this section

### Rotated/Tilted Mercator Projection (2011)(Projections, grids and model resolutions)

Sunday 25 September 2011
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 vectors (...)

### Geometry package for ALADIN & AROME LAM (Dec 2009)(Projections, grids and model resolutions)

Thursday 10 December 2009 by
Sommaire Projections used in ALADIN Les projections utilisées (...)

### Graphics about possible future discretizations and resolutions in Arpège and Aladin-France (April 2007)(Projections, grids and model resolutions)

Tuesday 3 April 2007 by
Sommaire Map of ARPEGE horizontal (...) Vertical levels cast in (...) Vertical levels cast in (...)

### New geometry routines for ALADIN (January 2006)(Projections, grids and model resolutions)

Thursday 19 January 2006
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 are (...)

### Les différents types de projection utilisés dans ALADIN (2002)(Projections, grids and model resolutions)

June 2002
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)

### SURGERY : to determine a gaussian reduced grid (1999)(Projections, grids and model resolutions)

1999
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 Legendre (...)

### SUBGRID : to define parameters of an ALADIN subgrid (1999)(Projections, grids and model resolutions)

1999
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: (...)

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