visa

1.0.0

Vegetation Imaging Spectroscopy Analyzer

0packages depend

2.5Kdownloads / year

3.2%test coverage

12/13checks pass

Overview

About

Maintained by Kang YuFirst published 2021-04-202 releasesCRAN page ↗GitHub ↗

Provides easy-to-use tools for data analysis and visualization for hyperspectral remote sensing (also known as imaging spectroscopy), with a particular focus on vegetation hyperspectral data analysis. It consists of a set of functions, ranging from the organization of hyperspectral data in the proper data structure for spectral feature selection, calculation of vegetation index, multivariate analysis, as well as to the visualization of spectra and results of analysis in the 'ggplot2' style.

Install

R (CRAN)pak (dev)Ubuntu (r2u)Fedora (COPR)openSUSE (OBS)

install.packages("visa", repos = "https://cloud.r-project.org/")

Installs the current CRAN release. Prebuilt binaries on Windows and macOS.

if (!requireNamespace("pak", quietly = TRUE))
  install.packages("pak", repos = "https://cloud.r-project.org/")
pak::pak("kang-yu/visa")

Development version from kang-yu/visa. Installs pak first if it is not already available.

Release

# enable cranapt (r2u) if it is not already set up, then install
grep -rqs r2u.stat.illinois.edu /etc/apt/sources.list /etc/apt/sources.list.d/ \
  || curl -fsSL https://raw.githubusercontent.com/eddelbuettel/r2u/master/inst/scripts/add_cranapt_noble.sh | sudo bash
sudo apt install -y r-cran-visa

Fast Ubuntu binaries via r2u (no compilation). The cranapt setup runs once and is skipped when it is already enabled.

bspm (used by r2u) also needs make: sudo apt install make

# enable the iucar/cran COPR if it is not already present, then install
ls /etc/yum.repos.d/*iucar*cran*.repo >/dev/null 2>&1 \
  || sudo dnf copr enable -y iucar/cran
sudo dnf install -y R-CRAN-visa

RPMs from the iucar/cran COPR, rebuilt from CRAN.

For install.packages() integration in R, also: sudo dnf install R-CoprManager

# add the autoCRAN OBS repo (Tumbleweed) if it is missing, then install
zypper -q lr | grep -qi autoCRAN \
  || sudo zypper addrepo https://download.opensuse.org/repositories/devel:/languages:/R:/autoCRAN/openSUSE_Tumbleweed/devel:languages:R:autoCRAN.repo
sudo zypper install -y R-visa

RPMs auto-built from CRAN on openSUSE OBS (Tumbleweed).

Health

CRAN checks

1NOTE12OK

Failing flavors

NOTE r-devel-linux-x86_64-debian-gcc

Slowest check: 4.7 min · r-devel-linux-x86_64-fedora-clang

Code health

Yes

Tests · ratio 0.02

3.2%

Coverage · measured lines

100%

Documentation · exports

Dependencies · direct

Check history

NOTE2026-08-01
12 OK · 1 NOTE · 0 WARNING · 0 ERROR · 0 FAILURE
OK2026-06-09
13 OK · 0 NOTE · 0 WARNING · 0 ERROR · 0 FAILURE
ERROR2026-06-08
12 OK · 0 NOTE · 0 WARNING · 1 ERROR · 0 FAILURE
OK2026-03-10
14 OK · 0 NOTE · 0 WARNING · 0 ERROR · 0 FAILURE

Documentation

READMEYes · 150 wordsVignettesYes · dynamicpkgdown siteNoNEWSYes · 100% structuredCode of conductNoContributing guideNo

Examples that run: 58%
Documented parameters: 100%
Return-value docs: 80%
References docs: 0%

Downloads

2.5K

CRAN downloads in the past year

Rank #16,898 · ~7/day · ~209/mo

Releases R versions

Daily download trend is not available in this view yet.

20630 days

63990 days

2.5K1 year

Compare downloads with other packages →

Also on93 r2u

Repository

GitHub ↗ kang-yu/visa

3Stars

2Forks

0Open issues

0Open PRs

2Releases

208Commits

2Contributors

208 commits · Last activity 2025-03-31

Stars over time

2025-06-18 · 32026-07-07 · 3

Repository practices

Upstream repositoryBeta

7 development-tooling and community-health practices detected across 5 families in the upstream repository

Checks run against github.com/kang-yu/visa on 2026-07-31.

Continuous integration (3)

GitHub ActionsTravis CIAppVeyor

Reproducibility and dev environment (1)

data-raw/

CRAN release process (1)

cran-comments.md

Lint, format, editor (1)

RStudio project

Show all practices

Coverage (1)

Codecov

How this is detected·Detection ruleset v1 (2026-07-18)

Dependencies

Declared dependencies

12 external dependencies (excludes base and recommended)

Depends (1)

R >= 3.5.0

Imports (9)

ggplot2 ggpmiscmethodsmagrittrMatrixplot3D plotly reshape2 RColorBrewer

LinkingTo (0)

none

Suggests (5)

devtools testthat knitr rmarkdown stringi

Enhances (0)

none

Dependency license breakdown →

Reverse dependencies

0direct

0indirect

Nothing depends on this yet.

Code & Tests

Datasets

People & History

People (1)

Maintainer (1)

Kang Yu

Author, Maintainer

Authors (1)

Kang Yu

Author, Maintainer

Package Timeline

2 releases. Pick two to compare their code metrics. R releases are shown for context.

R
R 4.6.0 released · 2026-04-24
R
R 4.5.0 released · 2025-04-11
1.0.0Latest
2025-03-19 · current release · diff ↗
R
R 4.4.0 released · 2024-04-24
R
R 4.3.0 released · 2023-04-21
R
R 4.2.0 released · 2022-04-22
R
R 4.1.0 released · 2021-05-18
0.1.0
2021-04-20
R
R 4.0.0 released · 2020-04-24

Package metadata

First published: 2021-04-20
Total releases: 2 / 5 yrs
License: GPL-3 OSI
Minimum R: ≥ 3.5.0
Bundled data: 125 KB / 2 files
Download size: 223 KB
Installed size: not tracked yet
With dependencies: not tracked yet

Report a problem with this page →