Exercise-02-polsar.ipynb

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   "cell_type": "markdown",
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   "source": [
    "### Import Python pakcages for reading and plotting files some samples "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "id": "260352fd",
   "metadata": {},
   "outputs": [],
   "source": [
    "from pathlib import Path\n",
    "import numpy as np\n",
    "import pprint\n",
    "import warnings\n",
    "warnings.filterwarnings(\"ignore\")\n",
    "\n",
    "# Reading RAT files and geo plotting\n",
    "import xarray as xr\n",
    "import geopandas as gpd\n",
    "\n",
    "# plots \n",
    "import matplotlib.pyplot as plt\n",
    "import seaborn as sns\n",
    "import matplotlib.colors as colors"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "id": "933ae3ce",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "0 /projects/data/03-polsar/slc_16afrisr0107_Phh_tcal_test.rat\n",
      "1 /projects/data/03-polsar/slc_16afrisr0107_Phv_tcal_test.rat\n",
      "2 /projects/data/03-polsar/slc_16afrisr0107_Pvh_tcal_test.rat\n",
      "3 /projects/data/03-polsar/slc_16afrisr0107_Pvv_tcal_test.rat\n"
     ]
    }
   ],
   "source": [
    "rootpath = Path('/projects/data')\n",
    "polsar_data = sorted(list( rootpath.glob('./03-*/slc*.rat')))\n",
    "\n",
    "for idx, file in enumerate(polsar_data):\n",
    "    print(idx, file)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "id": "053b42b1",
   "metadata": {},
   "outputs": [
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       "</style><pre class='xr-text-repr-fallback'>&lt;xarray.DataArray (y: 9984, x: 3772)&gt;\n",
       "[37659648 values with dtype=complex64]\n",
       "Coordinates:\n",
       "    band     int64 1\n",
       "  * y        (y) float64 0.5 1.5 2.5 3.5 ... 9.982e+03 9.982e+03 9.984e+03\n",
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       "Attributes: (12/18)\n",
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       "    ...                ...\n",
       "    file_type:         ENVI Standard\n",
       "    header_offset:     1000\n",
       "    interleave:        bsq\n",
       "    lines:             9984\n",
       "    samples:           3772\n",
       "    sensor_type:       DLR F-SAR</pre><div class='xr-wrap' hidden><div class='xr-header'><div class='xr-obj-type'>xarray.DataArray</div><div class='xr-array-name'></div><ul class='xr-dim-list'><li><span class='xr-has-index'>y</span>: 9984</li><li><span class='xr-has-index'>x</span>: 3772</li></ul></div><ul class='xr-sections'><li class='xr-section-item'><div class='xr-array-wrap'><input id='section-12404ef4-04b3-400a-bd3a-1a8b1f4c19f0' class='xr-array-in' type='checkbox' checked><label for='section-12404ef4-04b3-400a-bd3a-1a8b1f4c19f0' title='Show/hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-array-preview xr-preview'><span>...</span></div><div class='xr-array-data'><pre>[37659648 values with dtype=complex64]</pre></div></div></li><li class='xr-section-item'><input id='section-61991fdc-cdb1-4e0a-a9ea-71ef56479a8e' class='xr-section-summary-in' type='checkbox'  checked><label for='section-61991fdc-cdb1-4e0a-a9ea-71ef56479a8e' class='xr-section-summary' >Coordinates: <span>(3)</span></label><div class='xr-section-inline-details'></div><div class='xr-section-details'><ul class='xr-var-list'><li class='xr-var-item'><div class='xr-var-name'><span>band</span></div><div class='xr-var-dims'>()</div><div class='xr-var-dtype'>int64</div><div class='xr-var-preview xr-preview'>1</div><input id='attrs-66d9d473-48f9-4acc-b64b-cfaefb978928' class='xr-var-attrs-in' type='checkbox' disabled><label for='attrs-66d9d473-48f9-4acc-b64b-cfaefb978928' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-4e785f54-bd53-4c1e-9b7c-d7c76e74d97d' class='xr-var-data-in' type='checkbox'><label for='data-4e785f54-bd53-4c1e-9b7c-d7c76e74d97d' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'></dl></div><div class='xr-var-data'><pre>array(1)</pre></div></li><li class='xr-var-item'><div class='xr-var-name'><span class='xr-has-index'>y</span></div><div class='xr-var-dims'>(y)</div><div class='xr-var-dtype'>float64</div><div class='xr-var-preview xr-preview'>0.5 1.5 2.5 ... 9.982e+03 9.984e+03</div><input id='attrs-4e628932-bf47-4a91-999f-5cd37fb69446' class='xr-var-attrs-in' type='checkbox' disabled><label for='attrs-4e628932-bf47-4a91-999f-5cd37fb69446' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-62b0249d-a972-4131-a6f8-62ed4d64ca47' class='xr-var-data-in' type='checkbox'><label for='data-62b0249d-a972-4131-a6f8-62ed4d64ca47' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'></dl></div><div class='xr-var-data'><pre>array([5.0000e-01, 1.5000e+00, 2.5000e+00, ..., 9.9815e+03, 9.9825e+03,\n",
       "       9.9835e+03])</pre></div></li><li class='xr-var-item'><div class='xr-var-name'><span class='xr-has-index'>x</span></div><div class='xr-var-dims'>(x)</div><div class='xr-var-dtype'>float64</div><div class='xr-var-preview xr-preview'>0.5 1.5 2.5 ... 3.77e+03 3.772e+03</div><input id='attrs-380522c3-a31f-4269-90da-4fc92ddde799' class='xr-var-attrs-in' type='checkbox' disabled><label for='attrs-380522c3-a31f-4269-90da-4fc92ddde799' title='Show/Hide attributes'><svg class='icon xr-icon-file-text2'><use xlink:href='#icon-file-text2'></use></svg></label><input id='data-81f690a5-70b8-4a0f-9aeb-fb2e4a11b3ca' class='xr-var-data-in' type='checkbox'><label for='data-81f690a5-70b8-4a0f-9aeb-fb2e4a11b3ca' title='Show/Hide data repr'><svg class='icon xr-icon-database'><use xlink:href='#icon-database'></use></svg></label><div class='xr-var-attrs'><dl class='xr-attrs'></dl></div><div class='xr-var-data'><pre>array([5.0000e-01, 1.5000e+00, 2.5000e+00, ..., 3.7695e+03, 3.7705e+03,\n",
       "       3.7715e+03])</pre></div></li></ul></div></li><li class='xr-section-item'><input id='section-ca882ebb-b705-4584-8bad-aba790354c74' class='xr-section-summary-in' type='checkbox'  ><label for='section-ca882ebb-b705-4584-8bad-aba790354c74' class='xr-section-summary' >Attributes: <span>(18)</span></label><div class='xr-section-inline-details'></div><div class='xr-section-details'><dl class='xr-attrs'><dt><span>transform :</span></dt><dd>(1.0, 0.0, 0.0, 0.0, 1.0, 0.0)</dd><dt><span>res :</span></dt><dd>(1.0, -1.0)</dd><dt><span>is_tiled :</span></dt><dd>0</dd><dt><span>nodatavals :</span></dt><dd>(nan,)</dd><dt><span>scales :</span></dt><dd>(1.0,)</dd><dt><span>offsets :</span></dt><dd>(0.0,)</dd><dt><span>bands :</span></dt><dd>1</dd><dt><span>byte_order :</span></dt><dd>0</dd><dt><span>complex_function :</span></dt><dd>Magnitude</dd><dt><span>data_type :</span></dt><dd>6</dd><dt><span>default_bands :</span></dt><dd>1</dd><dt><span>description :</span></dt><dd>SLC AFRISR0107 T1P1H0_R5P1H0</dd><dt><span>file_type :</span></dt><dd>ENVI Standard</dd><dt><span>header_offset :</span></dt><dd>1000</dd><dt><span>interleave :</span></dt><dd>bsq</dd><dt><span>lines :</span></dt><dd>9984</dd><dt><span>samples :</span></dt><dd>3772</dd><dt><span>sensor_type :</span></dt><dd>DLR F-SAR</dd></dl></div></li></ul></div></div>"
      ],
      "text/plain": [
       "<xarray.DataArray (y: 9984, x: 3772)>\n",
       "[37659648 values with dtype=complex64]\n",
       "Coordinates:\n",
       "    band     int64 1\n",
       "  * y        (y) float64 0.5 1.5 2.5 3.5 ... 9.982e+03 9.982e+03 9.984e+03\n",
       "  * x        (x) float64 0.5 1.5 2.5 3.5 ... 3.77e+03 3.77e+03 3.772e+03\n",
       "Attributes: (12/18)\n",
       "    transform:         (1.0, 0.0, 0.0, 0.0, 1.0, 0.0)\n",
       "    res:               (1.0, -1.0)\n",
       "    is_tiled:          0\n",
       "    nodatavals:        (nan,)\n",
       "    scales:            (1.0,)\n",
       "    offsets:           (0.0,)\n",
       "    ...                ...\n",
       "    file_type:         ENVI Standard\n",
       "    header_offset:     1000\n",
       "    interleave:        bsq\n",
       "    lines:             9984\n",
       "    samples:           3772\n",
       "    sensor_type:       DLR F-SAR"
      ]
     },
     "execution_count": 3,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "ds = xr.open_rasterio(polsar_data[0]).squeeze()\n",
    "ds"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "f8f6d81d",
   "metadata": {},
   "source": [
    "## Plot RAT file  (Pol: HH) "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "id": "39f886de",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "application/vnd.jupyter.widget-view+json": {
       "model_id": "9bc2cda980ee481b8ee00ce27d9a34e6",
       "version_major": 2,
       "version_minor": 0
      },
      "text/plain": [
       "Canvas(toolbar=Toolbar(toolitems=[('Home', 'Reset original view', 'home', 'home'), ('Back', 'Back to previous …"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    },
    {
     "data": {
      "text/plain": [
       "<matplotlib.image.AxesImage at 0x7fcfa14b3070>"
      ]
     },
     "execution_count": 4,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "%matplotlib widget\n",
    "np.abs(ds).plot.imshow(cmap=\"gray\", \n",
    "                                 norm=colors.LogNorm(vmin=np.abs(ds).min(), vmax=np.abs(ds).max()))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "bb585e03",
   "metadata": {},
   "outputs": [],
   "source": []
  }
 ],
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