2.0 Customising Your Map Layer Visualisation: How to Guide

Modified on Wed, 08 Feb 2023 at 01:54 PM

This article explains how to use the customisation feature of the Add Map Layer block.


How to customise your map layer visualisation


TABLE OF CONTENTS


Make sure you understand the Add Map Layer block

  • To visualise data on the map, you need to include an Add Map Layer block.
  • It is a dynamic block, so modifies its appearance depending on the other blocks within the workflow. 
  • For example, when you add it to a dataset container block with Sentinel 2 selected, the choices look like this:

  • You can choose to view only a single band or an RGB colour composite. 
  • For each of the three colour bands (RGB) the drop-down menu gives you a choice of which bands are available.
  • Once you have selected the bands, you can customise the brightness, contrast, scaling, etc, by clicking on the settings icon (the cog-wheel).

Customising when using multiple band visualisation (e.g. an RGB composite)

  • When you choose to view multiple bands, the colour of the image is defined by the proportional values of the RGB bands so choosing a colour palette is not relevant.  
  • You will be offered the choice to adjust the Contrast Options.
  • The Contrast Options are for defining the minimum and maximum value to scale your images. You are given the following choices:
    • Default Dataset Visualisation:  The minimum and maximum scaling is pre-defined as a generally good setting for the data selected.
    • Dataset Min and Max: The min and max scaling is set to the lowest and highest values within the dataset.
    • Mean +/- 1 Standard Deviation:  The min and max are defined by the mean of the data plus and minus the standard deviation of the data. (If the data are normally distributed this will include approximately 68% of all data).
    • Mean +/- 2 Standard Deviations: The min and max are defined by the mean of the data plus and minus two standard deviations of the data. (If the data are normally distributed, this will include approximately 95% of all data).
    • p90: Scales the data so that min=0 but with max set so that the scaling includes 90% of all the data. (This is used to ensure that infrequent but very high values don't bias the scaling). 
    • p98: Scales the data so that min=0 but with max set so that the scaling includes 98% of all the data. (This is used to ensure that very infrequent but extremely high values don't bias the scaling). 
    • Custom: This allows you to specify your own minimum and maximum value for each band.  This means that for each of the Red, Green and Blue channels, you can apply different scaling. 
  • Note that when analysing a time series, the contrast statistics are calculated for the middle image (by time) and then applied to all of the others. 
  • The transparency of a layer on the map is governed by a slider on the Areas of Interest box on the map window, not on the Add Map Layer block.





Customising when using a single band visualisation

  • When you choose to view only a single band, when you click on the settings icon you will see two options:
    • Choose Colour Ramp.
    • Contrast Options.
  • The Colour Ramp is a selection of pre-defined colour palettes.  Click on the drop-down menu to see the selection.
  • The Invert toggle switch reverses the direction of the palette so that the max and min are the other way around. 
  • The Contrast Options are for defining the minimum and maximum value to scale your images. You are given the following choices:
    • Default Dataset Visualisation:  The minimum and maximum scaling is pre-defined as a generally good setting for the data selected.
    • Dataset Min and Max: The min and max scaling is set to the lowest and highest values within the dataset.
    • Mean +/- 1 Standard Deviation:  The min and max are defined by the mean of the data plus and minus the standard deviation of the data. (If the data are normally distributed this will include approximately 68% of all data).
    • Mean +/- 2 Standard Deviations: The min and max are defined by the mean of the data plus and minus two standard deviations of the data. (If the data are normally distributed, this will include approximately 95% of all data).
    • p90: Scales the data so that min=0 but with max set so that the scaling includes 90% of all the data. (This is used to ensure that infrequent but very high values don't bias the scaling). 
    • p98: Scales the data so that min=0 but with max set so that the scaling includes 98% of all the data. (This is used to ensure that very infrequent but extremely high values don't bias the scaling). 
    • Custom: This allows you to specify your own minimum and maximum value.  
  • Note that when analysing a time series, the contrast statistics are calculated for the middle image (by time) and then applied to all of the others. 
  • The transparency of a layer on the map is governed by a slider on the Areas of Interest box on the map window, not on the Add Map Layer block.






 

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