{
 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# Convert profiles vertical coordinate from Hybrid-Pressure to pressure"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "execution": {
     "iopub.execute_input": "2025-01-13T11:35:02.091983Z",
     "iopub.status.busy": "2025-01-13T11:35:02.091760Z",
     "iopub.status.idle": "2025-01-13T11:35:02.656635Z",
     "shell.execute_reply": "2025-01-13T11:35:02.656103Z"
    }
   },
   "outputs": [],
   "source": [
    "%matplotlib inline\n",
    "# for figures in notebook\n",
    "\n",
    "# import & initialize epygram\n",
    "import epygram\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": "2025-01-13T11:35:02.658702Z",
     "iopub.status.busy": "2025-01-13T11:35:02.658496Z",
     "iopub.status.idle": "2025-01-13T11:35:02.802603Z",
     "shell.execute_reply": "2025-01-13T11:35:02.802127Z"
    }
   },
   "outputs": [],
   "source": [
    "r = epygram.resources.meta_resource(os.path.join(INPUTS_DIR, 'ICMSHAROM+0022'), 'r', 'CL')  # CL = CombineLevels\n",
    "# in a \"CL\" meta-resource, fields are to be grabbed through a GRIB2 nomenclature\n",
    "t_as_grib2 = dict(discipline=0, parameterCategory=0, parameterNumber=0,  # this is temperature\n",
    "                  typeOfFirstFixedSurface=119)  # hybrid-pressure levels"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "execution": {
     "iopub.execute_input": "2025-01-13T11:35:02.804454Z",
     "iopub.status.busy": "2025-01-13T11:35:02.804243Z",
     "iopub.status.idle": "2025-01-13T11:35:05.393154Z",
     "shell.execute_reply": "2025-01-13T11:35:05.392653Z"
    }
   },
   "outputs": [],
   "source": [
    "# read as 3D\n",
    "t3d = r.readfield(t_as_grib2)\n",
    "t3d.sp2gp()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "execution": {
     "iopub.execute_input": "2025-01-13T11:35:05.395252Z",
     "iopub.status.busy": "2025-01-13T11:35:05.395063Z",
     "iopub.status.idle": "2025-01-13T11:35:05.407071Z",
     "shell.execute_reply": "2025-01-13T11:35:05.406526Z"
    }
   },
   "outputs": [],
   "source": [
    "# extract profiles\n",
    "profiles = []\n",
    "for position in [(6.1,46.2), (6.8,45.8), (6,46.5)]:\n",
    "    profgeo = t3d.geometry.make_profile_geometry(*position)  # make a V1D geometry at that position\n",
    "    profiles.append(t3d.extract_subdomain(profgeo))  # extract subdomain corresponding to the geometry of the profile"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "execution": {
     "iopub.execute_input": "2025-01-13T11:35:05.408695Z",
     "iopub.status.busy": "2025-01-13T11:35:05.408497Z",
     "iopub.status.idle": "2025-01-13T11:35:05.790485Z",
     "shell.execute_reply": "2025-01-13T11:35:05.789835Z"
    }
   },
   "outputs": [],
   "source": [
    "# plot with level as vertical coord\n",
    "fig = ax = None\n",
    "for p in profiles:\n",
    "    fig, ax = p.plotfield(labels='Temperature @ ({}, {})'.format(p.geometry.grid['longitudes'][0],\n",
    "                                                                 p.geometry.grid['latitudes'][0]),\n",
    "                          over=(fig, ax))  # superpose profiles"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## and now on a Pressure z-axis"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "execution": {
     "iopub.execute_input": "2025-01-13T11:35:05.792338Z",
     "iopub.status.busy": "2025-01-13T11:35:05.792172Z",
     "iopub.status.idle": "2025-01-13T11:35:05.962004Z",
     "shell.execute_reply": "2025-01-13T11:35:05.961489Z"
    }
   },
   "outputs": [],
   "source": [
    "# for the conversion, we need Surface pressure\n",
    "ps = epygram.open(r.resource.container.abspath, 'r').readfield('SURFPRESSION')\n",
    "# Ps is spectral and ln(Ps)\n",
    "ps.sp2gp()\n",
    "ps.operation('exp')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "execution": {
     "iopub.execute_input": "2025-01-13T11:35:05.964278Z",
     "iopub.status.busy": "2025-01-13T11:35:05.964050Z",
     "iopub.status.idle": "2025-01-13T11:35:05.969792Z",
     "shell.execute_reply": "2025-01-13T11:35:05.969332Z"
    }
   },
   "outputs": [],
   "source": [
    "from epygram.geometries.VGeometry import hybridP2pressure\n",
    "\n",
    "for p in profiles:\n",
    "    ps_local = ps.getvalue_ll(p.geometry.grid['longitudes'][0],\n",
    "                              p.geometry.grid['latitudes'][0])\n",
    "    # create the P vertical coordinate\n",
    "    p.geometry.vcoordinate = hybridP2pressure(p.geometry.vcoordinate,\n",
    "                                              ps_local,\n",
    "                                              vertical_mean='geometric')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "execution": {
     "iopub.execute_input": "2025-01-13T11:35:05.971851Z",
     "iopub.status.busy": "2025-01-13T11:35:05.971490Z",
     "iopub.status.idle": "2025-01-13T11:35:06.122404Z",
     "shell.execute_reply": "2025-01-13T11:35:06.121686Z"
    }
   },
   "outputs": [],
   "source": [
    "fig = ax = None\n",
    "for p in profiles:\n",
    "    fig, ax = p.plotfield(labels='Temperature @ ({}, {})'.format(p.geometry.grid['longitudes'][0],\n",
    "                                                                 p.geometry.grid['latitudes'][0]),\n",
    "                          over=(fig, ax))  # superpose profiles"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  }
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