Water bodies detection based on NDWI and otsu threshold v2.0.0¶

Water bodies detection based on NDWI and otsu threshold applied to Sentinel-2 COG STAC items

This software is licensed under the terms of the Creative Commons Attribution-ShareAlike 4.0 International license - SPDX short identifier: CC-BY-SA-4.0

2022-09-01 - 2026-10-10T21:46:39.161 Copyright EO Application Packaging - > https://github.com/eoap

Project Team¶

Authors¶

Name	Email	Organization	Role	Identifier
Doe, Jane	jane.doe@acme.earth	ACME	N/A	None
Doe, John	john.doe@acme.earth	ACME	N/A	None

Contributors¶

The are no contributors for this project.

Mastering Earth Observation Application Packaging with CWL¶

Mastering Earth Observation Application Packaging with CWL can be found on https://eoap.github.io/mastering-app-package.

Runtime environment¶

Supported Operating Systems¶

The are no Supported Operating Systems specified for this project.

Requirements¶

detect_water_body¶

CWL Class¶

Workflow

Requirements¶

Inputs¶

Id	Type	Label	Doc
`aoi`	Polygon: `type`: enum: `Polygon` `coordinates`: `array` of `array` of `array` of double `bbox`: `array` of double	Area of interest	GeoJSON Polygon defining the area to crop; raster pixels outside the polygon are masked.
`epsg`	enum: `4326`	Coordinate reference system	EPSG code
`bands`	`array` of enum: `green` `nir` `nir08`	NDWI bands	bands used for the NDWI
`item`	URI: `value`: string	STAC item	STAC item

Steps¶

Id	Runs	Label	Doc
node_crop	`#crop`	Crop bands	Crop the selected bands to the area of interest.
node_normalized_difference	`#norm_diff`	Compute NDWI	Compute the normalized difference water index from the cropped bands.
node_otsu	`#otsu`	Detect water bodies	Apply the Otsu threshold to produce a binary water body mask.

Outputs¶

Id	Type	Label	Doc
`detected_water_body`	File	Detected water body	Binary raster mask produced by the nested water body detection workflow.

OGC API - Processes¶

When detect_water_body Workflow is exposed through OGC API - Processes - Part 1: Core, inputs and outputs fields below represent the interface of the getProcessDescription API.

Inputs¶

Outputs¶

UML Diagrams¶

Activity diagram¶

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Component diagram¶

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Class diagram¶

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Sequence diagram¶

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State diagram¶

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Run in step¶

node_crop

crop¶

CWL Class¶

CommandLineTool

Inputs¶

Id	Option	Type
`item`	`--input-item`	URI: `value`: string
`aoi`	`--aoi`	Polygon: `type`: enum: `Polygon` `coordinates`: `array` of `array` of `array` of double `bbox`: `array` of double
`epsg`	`--epsg`	enum: `4326`
`band`	`--band`	enum: `green` `nir` `nir08`

Execution usage example:¶

crop \
--input-item <ITEM> \
--aoi <AOI> \
--epsg <EPSG> \
--band <BAND>

Run in step¶

node_normalized_difference

norm_diff¶

CWL Class¶

CommandLineTool

Inputs¶

Id	Option	Type
`rasters`	`--rasters`	`array` of File

Execution usage example:¶

norm_diff \
--rasters <RASTERS>

Run in step¶

node_otsu

otsu¶

CWL Class¶

CommandLineTool

Inputs¶

Id	Option	Type
`raster`	`--raster`	File

Execution usage example:¶

otsu \
--raster <RASTER>