getExif.ipynb

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  {
   "cell_type": "code",
   "execution_count": 1,
   "id": "2c942b69",
   "metadata": {},
   "outputs": [],
   "source": [
    "from PIL import Image\n",
    "import PIL.ExifTags as ExifTags"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "5dfe6f45",
   "metadata": {},
   "source": [
    "## 修正したプログラム"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "id": "02320aef",
   "metadata": {},
   "outputs": [],
   "source": [
    "def get_gps(fname):\n",
    "    im = Image.open(fname)\n",
    "    # EXIF情報を辞書型で得る\n",
    "    exif = {\n",
    "        ExifTags.TAGS[k]: v\n",
    "        for k, v in im._getexif().items()\n",
    "        if k in ExifTags.TAGS\n",
    "    }\n",
    "    # GPS情報を得る --- (*2)\n",
    "    gps_tags = exif[\"GPSInfo\"]\n",
    "    gps = {\n",
    "        ExifTags.GPSTAGS.get(t, t): gps_tags[t]\n",
    "        for t in gps_tags\n",
    "    }\n",
    "    \n",
    "    # 変更箇所\n",
    "    conv_deg = lambda v : v[0] + (v[1] / 60.0) + (v[2] / 3600.0)\n",
    "    \n",
    "    lat = conv_deg(gps[\"GPSLatitude\"])\n",
    "    lat_ref = gps[\"GPSLatitudeRef\"]\n",
    "    if lat_ref != \"N\": lat = 0 - lat\n",
    "    lon = conv_deg(gps[\"GPSLongitude\"])\n",
    "    lon_ref = gps[\"GPSLongitudeRef\"]\n",
    "    if lon_ref != \"E\": lon = 0 - lon\n",
    "        \n",
    "    return lat, lon"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "id": "7e427460",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "(36.62291111111111, 138.24255277777777)"
      ]
     },
     "execution_count": 3,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "fname = 'XX.JPG'\n",
    "get_gps(fname)"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "e26c3164",
   "metadata": {},
   "source": [
    "## 応用編：フォルダ内の全ファイルのEXIF情報を取得し，geojson形式で出力"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "7e999049",
   "metadata": {},
   "outputs": [],
   "source": [
    "import os\n",
    "import glob\n",
    "import pandas as pd\n",
    "import geopandas as gpd\n",
    "import numpy as np"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "d13af66e",
   "metadata": {},
   "source": [
    "###  ファイルリストを取得"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "38c4bf23",
   "metadata": {},
   "outputs": [],
   "source": [
    "path = r'C:\\\\Users'\n",
    "fnames = glob.glob(path + '\\\\*.JPG')"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "39239ce1",
   "metadata": {},
   "source": [
    "### 位置情報を取得し，GeoDataFrameに格納"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "68127473",
   "metadata": {},
   "outputs": [],
   "source": [
    "coords = [get_gps(f) for f in fnames]\n",
    "c = np.array(coords)\n",
    "\n",
    "df = pd.DataFrame({\n",
    "'lat':c[:,0] ,'lon':c[:,1]\n",
    ",'filename':[os.path.basename(f) for f in fnames]\n",
    ",'fullpath': fnames\n",
    "})\n",
    "\n",
    "geometry = gpd.points_from_xy(df.lon, df.lat, crs=\"EPSG:4326\")\n",
    "gdf = gpd.GeoDataFrame(df, geometry=geometry)"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "3556888b",
   "metadata": {},
   "source": [
    "### geojson形式で出力"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "5a15dc59",
   "metadata": {},
   "outputs": [],
   "source": [
    "out = gdf.to_file('photo.geojson', driver='GeoJSON')\n",
    "del out"
   ]
  }
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