geeagri 1.0.1

Python tools for agricultural analysis powered by Google Earth Engine.

Welcome to geeagri

A Python package for agricultural monitoring and analysis using Google Earth Engine

• GitHub repo: https://github.com/geonextgis/geeagri
• Documentation: https://geonextgis.github.io/geeagri
• PyPI: https://pypi.org/project/geeagri
• Notebooks: https://github.com/geonextgis/geeagri/tree/main/docs/examples
• License: MIT

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Introduction

geeagri is a Python package that integrates the power of Google Earth Engine (GEE) with domain-specific agricultural analysis. It enables scalable processing, downloading, and visualization of satellite data for crop monitoring, yield estimation, and agro-environmental assessment.

This package builds upon geospatial tools like geemap and simplifies workflows for scientists, researchers, and policymakers working in agriculture. Whether you're interested in vegetation monitoring, drought assessment, phenology extraction, or productivity mapping, geeagri offers tools and prebuilt pipelines to make your analysis easier and faster.

geeagri is ideal for:

• Researchers working with satellite-derived agricultural indicators.
• Practitioners and analysts from development, environmental, and governmental organizations.
• Students and educators looking to learn remote sensing for agriculture.

For a complete list of examples and use cases, visit the notebooks section.

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Key Features

• Long-term Time Series Extraction — Retrieve satellite or climate time series from Google Earth Engine (GEE) for both point and polygon geometries.
• Image Patch Generation — Extract image tiles or patches from satellite imagery in GEE to support local-scale computer vision or deep learning model training.
• Multivariate Dimensionality Reduction — Transform complex multivariate datasets into a few principal components while preserving essential information using PCA.
• Harmonic Regression Analysis — Easily perform harmonic regression on vegetation or climate indices to study seasonal and periodic trends.
• Cloud-free Time Series Creation — Generate regular, gap-filled, and cloud-free time series from irregular satellite observations.
• Phenology and Smoothing Tools — Apply smoothing algorithms and extract phenological metrics (Start of Season, Peak of Season, End of Season) from high-resolution satellite data.

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Installation

conda create -n geeagri python=3.10
conda activate geeagri
pip install geeagri
# (Optional) Upgrade to the latest version if already installed
pip install --upgrade geeagri

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Example Usage

Example 1: Extract timeseries to point

import ee
import geeagri
from geeagri.extract import extract_timeseries_to_point

# Authenticate and initialize the Earth Engine API
ee.Authenticate()
ee.Initialize()

# Define point location (longitude, latitude)
lon, lat = -98.15, 30.50
point = ee.Geometry.Point([lon, lat])

# Load ERA5-Land daily aggregated climate dataset
era5_land = ee.ImageCollection("ECMWF/ERA5_LAND/DAILY_AGGR")

# Extract daily temperature, precipitation, and solar radiation time series
era5_land_point_ts = extract_timeseries_to_point(
    lat=lat,
    lon=lon,
    image_collection=era5_land,
    start_date="2020-01-01",
    end_date="2021-01-01",
    band_names=[
        "temperature_2m_min",
        "temperature_2m_max",
        "total_precipitation_sum",
        "surface_solar_radiation_downwards_sum",
    ],
    scale=11132,  # spatial resolution in meters (~11 km)
)

This example demonstrates how to use geeagri to extract daily climate variable time series (temperature, precipitation, and solar radiation) from the ERA5-Land dataset at a specific geographic point using the Google Earth Engine (GEE) Python API.

Output Plot:

Example 2: Create regular satellite timeseries

import ee
from geeagri.preprocessing import Sentinel2CloudMask, RegularTimeseries

# Authenticate and initialize the Earth Engine API
ee.Authenticate()
ee.Initialize()

# Define the bounding box
bbox = [-98.451233, 38.430732, -98.274765, 38.523996]
region = ee.Geometry.BBox(*bbox)

# Get cloud masked Sentinel-2 image collection
s2_cloud_masker = Sentinel2CloudMask(
    region=region,
    start_date="2020-01-01",
    end_date="2021-01-01",
    cloud_filter=60,
    cloud_prob_threshold=50,
    nir_dark_threshold=0.15,
    shadow_proj_dist=1,
    buffer=50
)

s2_cloud_masked = s2_cloud_masker.get_cloudfree_collection()

# Calculate NDVI
def calculateNDVI(image):
    ndvi = image.expression(
        "(NIR - Red) / (NIR + Red)",
        {"NIR": image.select("B8"), "Red": image.select("B4")},
    ).copyProperties(image, ["system:time_start"])

    ndvi = ee.Image(ndvi).rename("ndvi").clip(region)

    return ndvi


ndvi_col = s2_cloud_masked.map(calculateNDVI)

# Instantiate a 'RegularTimeseries' object
reg_timeseries = RegularTimeseries(
    image_collection=ndvi_col,
    interval=5,  # Interval (in days) between consecutive target dates
    window=45,  # Temporal window in days
)

# Get the regular timeseries
ndvi_regular = reg_timeseries.get_regular_timeseries()

This example demonstrates how to extract a regular, gap-filled NDVI time series from Sentinel-2 imagery using geeagri. First, a Sentinel2CloudMask object is created to mask clouds and shadows over a defined bounding box using thresholds for cloud probability, dark NIR pixels, and shadow projection. The cloud-masked images are then processed with a custom function to calculate NDVI for each image. Finally, a RegularTimeseries object generates a temporally consistent NDVI time series at a specified interval and temporal window. This workflow allows users to efficiently obtain high-quality, regular NDVI time series from raw Sentinel-2 imagery while handling cloud and shadow contamination.

Raw NDVI Time Series with Cloud Gaps:

Regular Gap-filled NDVI Time Series:

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