Generating Frequency Image for an ImageCollection classified

[2021113691]

I have classified pixels of an ImageCollection into categories such as open water, partial water, land, cloud or shadow. How can I generate an image showing the frequency of pixels classified as open water and partial water, considering only the total count of pixels classified as open water, partial water, and land (excluding cloud or shadow) as the denominator?

[giswqs]

See https://geemap.org/common/#geemap.common.image_histogram

[2021113691]

I don't want to generate a histogram. Instead, I want to use the classification of pixels in an ImageCollection to generate an image similar to the one below.I want the generated Image to have two bands: one representing the frequency of pixels classified as open water, and the other representing the frequency of pixels classified as partial water (excluding those classified as shadow or cloud).Is there any way I can achieve my goals?

[giswqs]

Use the map function to create a collection of binary images. Then use sum to get occurrence.

collection.map(lambda img: img.eq(<CLASS-VALUE>)).sum()