{
 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# Get the 3D Pressure field from a hybrid-pressure coordinate FA file (and its surface pressure)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "execution": {
     "iopub.execute_input": "2025-01-13T11:34:57.688447Z",
     "iopub.status.busy": "2025-01-13T11:34:57.687993Z",
     "iopub.status.idle": "2025-01-13T11:34:58.011864Z",
     "shell.execute_reply": "2025-01-13T11:34:58.011383Z"
    }
   },
   "outputs": [],
   "source": [
    "# import & initialize epygram\n",
    "import epygram\n",
    "from epygram.geometries.VGeometry import hybridP_coord_and_surfpressure_to_3D_pressure_field\n",
    "epygram.init_env()\n",
    "\n",
    "import os\n",
    "INPUTS_DIR = os.path.join('..', 'inputs')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "execution": {
     "iopub.execute_input": "2025-01-13T11:34:58.014095Z",
     "iopub.status.busy": "2025-01-13T11:34:58.013889Z",
     "iopub.status.idle": "2025-01-13T11:35:00.215419Z",
     "shell.execute_reply": "2025-01-13T11:35:00.214892Z"
    }
   },
   "outputs": [],
   "source": [
    "# open resource in read mode\n",
    "r = epygram.open(os.path.join(INPUTS_DIR, 'ICMSHAROM+0022'), 'r')\n",
    "surfP = r.readfield('SURFPRESSION')\n",
    "hybridP_geo = r.readfield('S058TEMPERATURE').geometry.vcoordinate"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "execution": {
     "iopub.execute_input": "2025-01-13T11:35:00.217429Z",
     "iopub.status.busy": "2025-01-13T11:35:00.217267Z",
     "iopub.status.idle": "2025-01-13T11:35:00.222110Z",
     "shell.execute_reply": "2025-01-13T11:35:00.221517Z"
    }
   },
   "outputs": [],
   "source": [
    "surfP.sp2gp()  # field is spectral\n",
    "surfP.operation('exp')  # and log(Ps)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "execution": {
     "iopub.execute_input": "2025-01-13T11:35:00.223665Z",
     "iopub.status.busy": "2025-01-13T11:35:00.223474Z",
     "iopub.status.idle": "2025-01-13T11:35:00.292131Z",
     "shell.execute_reply": "2025-01-13T11:35:00.291666Z"
    }
   },
   "outputs": [],
   "source": [
    "p3D = hybridP_coord_and_surfpressure_to_3D_pressure_field(hybridP_geo, surfP,\n",
    "                                                          vertical_mean='geometric')\n",
    "# in AROME, the computation of pressure at mass-levels is a geometric average of the surrounding flux-levels pressures"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "execution": {
     "iopub.execute_input": "2025-01-13T11:35:00.294135Z",
     "iopub.status.busy": "2025-01-13T11:35:00.293987Z",
     "iopub.status.idle": "2025-01-13T11:35:00.298665Z",
     "shell.execute_reply": "2025-01-13T11:35:00.298333Z"
    }
   },
   "outputs": [],
   "source": [
    "p3D.data.shape"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  }
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