introduction_to_evalscripts

Interactive Intro to Evalscripts

The notebooks in this repository give a solid intro to evalscripts.

To be able to follow along well in these notebooks a few requirements are necessary:

• Basic Knowledge of Remote Sensing
  • Sensors
  • Spectral Bands
  • Indices
• Basic Familiarity with Sentinel Hub
  • Collections
  • Processing API
  • Statistical API
• Basic knowledge of programming concepts
  • functions
  • variables
  • arrays
  • objects

The two notebooks cover the following topics:

1. Basic evalscripts

Link to notebook

• How to construct basic non-temporal evalscripts using the setup and evaluatePixel function.
• Covering sampleTypes and when to use which sample Type
• Format requirements when streaming data to a web application vs. downloading data for analytical use
• How Sentinel Hub deals with missing data (using the dataMask output) and how to assign no data values to the output when doing analytic work or set pixels transparent when streaming data visualizations
• Common issues to check when evalscripts don't return the expected output and how to throw errors to help with debugging

2. Multi temporal evalscripts

Link to notebook

• Covering the mosaicking options SIMPLE, TILE and ORBIT and what their differences are
• How to access the samples object in evaluatePixel when doing multi-temporal analysis
• Analysis:
  • cloud-free mosaics
  • maximum and mean NDVI composites
  • temporal NDVI differences