Call for contributions to algorithm modules (GEE applications)

[giswqs]

Geemap is adding a collection of algorithm modules dedicated to various GEE applications, such as surface water, vegetation, agriculture, hydrology, urban, weather, climate, land cover, image processing, machine learning, deep learning, among others. One example is the RivWidthCloud module for extracting river centerline and width, which has been integrated into geemap (see river.py and #682).

I welcome your contributions, suggestions, comments, and pull requests. Links to papers, source codes (JavaScript/Python), repos are also welcome.

[giswqs]

A potential module for coastline extraction.
References:

• https://code.earthengine.google.co.in/c06179ff6575c0cedd66fa1cca6e4022
• https://twitter.com/spatialthoughts/status/1448307878935203842
• https://github.com/gee-community/ee-packages-py/blob/main/eepackages/utils.py#L52

[touldimos]

Generally, your work is really impressive.

I want to do a suggestion for the SRTM (30x30m) NASA dataset: It would be nice having the option to display SRTM in contours and export them (the contours), for a specific area of interest, in shapefile. I have implemented a Python script but it cannot handle large areas.

Linkedin: Dimos Touloumidis
email: touldimos@gmail.com

[giswqs]

@touldimos Here is an example for creating contour lines in Earth Engine. For exporting a large vector dataset, you need to use Google Drive. I will see if I can add a function to geemap regarding this.

• https://mygeoblog.com/2017/01/28/contour-lines-in-gee/
• https://code.earthengine.google.com/131539135fe5bd1f7b34a11620927dd0
• https://groups.google.com/g/google-earth-engine-developers/c/MnzY1suzhdQ/m/mxKXt1bdAQAJ

[touldimos]

Yes, I am aware of that script. Thanks for the immediate response.

I thought it would be a nice addition to geemap. :)

[giswqs]

@touldimos I have added a contour function (generating raster contours) to geemap. See the notebook example. Unfortunately, GEE does not support image.reduceToVectors(geometryType='polyline'). There is no way to convert an image to polyline vector at the moment. See this thread.

[touldimos]

Thank you very much! Let's hope that it will be a future addition for GEE too.

[giswqs]

Inland Water Body Mapping Using Multitemporal Sentinel-1 SAR Data

• Marzi, D., Gamba, P., 2021. Inland Water Body Mapping Using Multitemporal Sentinel-1 SAR Data. IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing 14, 11789–11799. https://doi.org/10.1109/JSTARS.2021.3127748
• Code: https://code.earthengine.google.com/c5cbade5ffe8b7efaff7cb2a74da068b

[ErikSeras]

Sentinel-2 Cloud Masking with s2cloudless
https://developers.google.com/earth-engine/tutorials/community/sentinel-2-s2cloudless

[giswqs]

Sentinel-2 Cloud Masking with s2cloudless https://developers.google.com/earth-engine/tutorials/community/sentinel-2-s2cloudless

Thanks for the suggestion. It has a Colab example available. You are welcome to adapt the example and submit a pull request to geemap.

https://colab.research.google.com/github/google/earthengine-community/blob/master/tutorials/sentinel-2-s2cloudless/index.ipynb