Update docs/source/sentinel.rst

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Sentinel Hub
=====
QuartzMap supports dates, date ranges, and date comparison for Sentinel Hub.
QWC2 has a built in compare function that allows you to compare layers.
You can use either the Sentinel Hub QGIS plugin or standard WMS.
Below is an example of how to use this with Sentinel Hub NDVI data
Publish your map as normal:
1. Create Your QGIS Project using the Sentinel Hub QGIS Plugin
1. In QGIS, open the Project you wish to publish and start qgis2web
2. Create two layers with differing dates that you wish to compare:
2. FTP the map using FTP or use the "Upload" function to upload.
.. image:: images/sentinel-1.png
.. image:: images/sentinel-1.jpg
3. Publish your project as normal
QuartzMap will detect the date and range and use the start/end as default.
.. image:: images/sentinel-2.png
Users can then select data comparisons to view.
4. Under Map Tools, go to Layers and Legends
You can also limit the range via the Map setting as shown below
Tick the "Compare top layer" box
.. image:: images/sentinel-2.jpg.png
You can now use the slider to compare the dates:
You can also enable proxy of your Sentinel Hub url to protect the url.
.. image:: images/sentinel-3.png
.. image:: images/sentinel-4.png