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Important

• Don't forget to check the CONTRIBUTING.md
• This issue is related to the feature/UI branch and so should the PR come from it (or make a new branch with prefix UI-) and it shall be merged into the develop branch.

Main issue gist

(original question asked in here in gis.stackexchange.com/questions/436671/

I am using Python, Google Earth Engine and Folium.

• Is there a way to stack layers by categories in Folium & Google Earth Engine (Python not JS editor)?
• I want to achieve something like leaflet.js "Leaflet.StyledLayerControl" plugin.

If not, then I just need a way to point out in the layer panel where each category starts by adding a simple title or a separator (like the default separator in Folium right under the first basemap layer)

Visuals

My results (native folium layer panel)	Wanted results (anything similar)
The default rendered Layer Control Panel in Folium produces layers stacked in two categories in the HTML file; "base_layers": single option basemaps (radio buttons). "overlays": all the other layers vector/raster (checkboxes)	I edited the HTML file inside the browser using the Developer Tools console to add elements as to show where each category starts. Anything resembling this result is what I want to achieve with Folium and GEE in python.

Here's an example of a Leaflet.js plugin that does something similar to what I want to achieve in python with Folium and GEE (see links at the bottom of the question):

The problem

• There's no way to customize the Folium Layer Panel to stack layers under a category
• There is no way to add a content to the Layer Panel, like a Header or text or a separator (even though you can see one automatically generated separator under the first two basemaps radio buttons by folium)

Tasks:

• Find a way to organize Folium layers into categories (separateed by a category title or separator div or else)
• Find a way to organize Google Earth Engine layers into categories (separateed by a category title or separator div or else)

NOTE:

As you know, modifying the resulting HTML file from Folium and GEE generated map is not an option as it is re-written every time we execute the python script, and it doesn't contain the elements of the layer control panel in the file itself but calls it from leaflet which ends up displaying a different file in the browser when it comes to the source code of the actual HTML file.

• Leaflet.StyledLayerControl GitHub repo
• Leaflet.StyledLayerControl Live Demo
• Leaflet plugins

Important

• Don't forget to check the CONTRIBUTING.md
• This issue is related to the feature/UI branch and so should the PR come from it (or make a new branch with prefix UI-) and it shall be merged into the develop branch.

Main issue gist

Currently using NASA SRTM Digital Elevation Data Version 4: (CGIAR/SRTM90_V4) which has a 90m resolution, it's been alright so far but a higher resolution imagery would improve the results greatly and gives better slopes aspects for a more accurate analysis and understanding of the terrain.

preview:

current looks of the NASA SRTM:

DEM (with hillshade) 90m	Slopes derived from same DEM

Important

• Don't forget to check the CONTRIBUTING.md
• This issue is related to the feature/imagery-analysis branch and so should the PR come from it (or make a new branch with prefix Imagery-) and it shall be merged into the develop branch.

Main issue gist

(original question asked in here in gis.stackexchange.com/questions/436671/

I'm trying to mosaic NDVI and NDWI layers into one layer using GEE (python). This is for having land part of the map covered by the NDVI results and the water part of the map covered by NDWI. All that in one layer.

Any idea how to make this work?

See here for reference: Google Earth Engine: Image Visualization

Visuals

Wanted result	Similar to
Mosaic of NDWI & NDVI as one layer	Mosaic of NDWI & False Color Composite

The problem

• Simply not working.
• No errors.
• "Mosaic: NDWI x NDVI" layer exist but not showing visuals.
• "Clipped: NDWI x NDVI" layer exist and only showing NDVI land part but in a grey scale colors, not original NDVI palette. The NDWI part of the mosaic is left out not showing.

my actual results-1 (problem)	my actual results-2 (problem)
Clipped mosaic of NDWI & NDVI as one layer Greyed out and no NDWI	Nothing shows on the map (Mosaic of NDWI & NDVI not working)

My approach

I first followed the official tutorial in GEE documentation (see here: https://developers.google.com/earth-engine/guides/image_visualization#mosaicking).

• Managed to reproduce the results and successfully mosaicked NDWI & FCC (false color composite) as one image layer.
• I tried to mosaic NDWI and NDVI but no results show up in that layer. No errors of execution in the console tho.