Work with QGIS
==============

QGIS supports Drag and Drop feature to load files. 
You can simply drag the orthoimage into QGIS, 
as well as the shapefile obtained from GRID

.. figure:: res/qgis/shapefiles.png
   :align: center
   :width: 500

Right click on the shapefile layer, and choose ``property`` to define the layer.
In the tab of ``Symbology``, users can design how to show the border.
Our example use red solid line to draw borders without filling any color.

.. figure:: res/qgis/border.png
   :align: center

In the tab of ``label``, users can further config the way to show plot IDs.

.. figure:: res/qgis/label.png
   :align: center

It's also possible to take advantage of GRID outputs. 
In the tab of ``Symbology``, 
and select ``Graduated`` in the very top drop-down menu.
Then in the drop-down menu of ``Value``, 
select a feature you'd like to visualize.
In this example, we use NDVI as indicators.
Then click ``classify`` button to generate the heat map.

.. figure:: res/qgis/fill.png
   :align: center

Visualize data in a heatmap allows us to evaluate the spatial variation 
between different plots.

.. figure:: res/qgis/inspect.png
   :align: center