local_chunk_extract

Computes statistical summaries for a given spatial feature (<code>sf_chunk</code>)
from an Earth Engine <code>ee$ImageCollection</code> over a specified date range.
This function extracts values for a specific band and applies a chosen
reducer.

internal

Simplifies the creation, management, and updating of local databases using data extracted from 'Google Earth Engine' ('GEE'). It integrates with 'GEE' to store, aggregate, and process spatio-temporal data, leveraging 'SQLite' for efficient, serverless storage. The 'geeLite' package provides utilities for data transformation and supports real-time monitoring and analysis of geospatial features, making it suitable for researchers and practitioners in geospatial science. For details, see Kurbucz and Andrée (2025) "Building and Managing Local Databases from Google Earth Engine with the geeLite R Package" <https://hdl.handle.net/10986/43165>.

Marcell T. Kurbucz

geeLite

Building and Managing Local Databases from 'Google Earth Engine'

Bo Pieter Johannes Andrée

local_chunk_extract function

<dl><dt>sf_chunk</dt>
<dd>[mandatory] (sf) An sf data frame containing geometry.</dd>
<dt>imgs</dt>
<dd>[mandatory] (ee$ImageCollection) The Earth Engine image
collection to extract statistics from.</dd>
<dt>dates</dt>
<dd>[mandatory] (character) A vector of date strings corresponding
to images in the collection.</dd>
<dt>band</dt>
<dd>[mandatory] (character) The name of the band to extract.</dd>
<dt>stat</dt>
<dd>[mandatory] (character) The statistical function to apply
(e.g., "mean").</dd>
<dt>stat_fun</dt>
<dd>[mandatory] (ee$Reducer) The Earth Engine reducer function.</dd>
<dt>scale</dt>
<dd>[mandatory] (numeric) The spatial resolution in meters for
reduce operations.</dd></dl>

Arguments

Extract Statistics Locally for a Single Geometry Chunk — local_chunk_extract

<dl>

<dt>sf_chunk</dt>
<dd>[mandatory] (sf) An sf data frame containing geometry.</dd>


<dt>imgs</dt>
<dd>[mandatory] (ee$ImageCollection) The Earth Engine image
collection to extract statistics from.</dd>


<dt>dates</dt>
<dd>[mandatory] (character) A vector of date strings corresponding
to images in the collection.</dd>


<dt>band</dt>
<dd>[mandatory] (character) The name of the band to extract.</dd>


<dt>stat</dt>
<dd>[mandatory] (character) The statistical function to apply
(e.g., "mean").</dd>


<dt>stat_fun</dt>
<dd>[mandatory] (ee$Reducer) The Earth Engine reducer function.</dd>


<dt>scale</dt>
<dd>[mandatory] (numeric) The spatial resolution in meters for
reduce operations.</dd>

</dl>

local_chunk_extract: Extract Statistics Locally for a Single Geometry Chunk

Description

Usage

Value

Arguments