sits_pred_sample

Many machine learning algorithms (especially deep learning)
use part of the original samples as test data to adjust its hyperparameters
and to find an optimal point of convergence using gradient descent.
This function extracts a fraction of the predictors to serve as test values
for the deep learning algorithm.

An end-to-end toolkit for land use and land cover classification
using big Earth observation data, based on machine learning methods
applied to satellite image data cubes, as described in Simoes et al (2021) <doi:10.3390/rs13132428>.
Builds regular data cubes from collections in AWS, Microsoft Planetary Computer,
Brazil Data Cube, and Digital Earth Africa using the Spatio-temporal Asset Catalog (STAC)
protocol (<https://stacspec.org/> and the 'gdalcubes' R package
developed by Appel and Pebesma (2019) <doi:10.3390/data4030092>.
Supports visualization methods for images and time series and
smoothing filters for dealing with noisy time series.
Includes functions for quality assessment of training samples using self-organized maps
as presented by Santos et al (2021) <doi:10.1016/j.isprsjprs.2021.04.014>.
Provides machine learning methods including support vector machines,
random forests, extreme gradient boosting, multi-layer perceptrons,
temporal convolutional neural networks proposed by Pelletier et al (2019) <doi:10.3390/rs11050523>,
residual networks by Fawaz et al (2019) <doi:10.1007/s10618-019-00619-1>, and temporal attention encoders
by Garnot and Landrieu (2020) <arXiv:2007.00586>.
Performs efficient classification of big Earth observation data cubes and includes
functions for post-classification smoothing based on Bayesian inference, and
methods for uncertainty assessment. Enables best
practices for estimating area and assessing accuracy of land change as
recommended by Olofsson et al (2014) <doi:10.1016/j.rse.2014.02.015>.
Minimum recommended requirements: 16 GB RAM and 4 CPU dual-core.

Gilberto Camara

sits

Satellite Image Time Series Analysis for Earth Observation Data
Cubes

Rolf Simoes

Felipe Souza

Lorena Santos

Pedro Andrade

Karine Ferreira

Alber Sanchez

Gilberto Queiroz

sits_pred_sample function

<dl><dt>pred</dt>
<dd>X-Y predictors: a data.table with one row per sample.</dd>
<dt>frac</dt>
<dd>Fraction of the X-Y predictors to be extracted</dd></dl>

Arguments

Gilberto Camara, <a href="/link/gilberto.camara%40inpe.br?package=sits&version=1.4.0" data-mini-rdoc="sits::gilberto.camara@inpe.br">gilberto.camara@inpe.br</a>

Author

Obtain a fraction of the predictors data frame — sits_pred_sample

<dl>

<dt>pred</dt>
<dd>X-Y predictors: a data.table with one row per sample.</dd>


<dt>frac</dt>
<dd>Fraction of the X-Y predictors to be extracted</dd>

</dl>

Gilberto Camara, <a href='mailto:gilberto.camara@inpe.br'>gilberto.camara@inpe.br</a>

sits_pred_sample: Obtain a fraction of the predictors data frame

Description

Usage

Value

Arguments

Author

Examples