安装rgdal软件包是否也会在您的计算机上安装GDAL？

当我看包rgdal的文档时，它说

“R贡献的包rgdal可从CRAN获得，作为源包安装在具有完整构建序列和外部依赖性的平台上。”

GDAL是一个外部依赖项，所以我认为这意味着它将从CRAN下载并与包一起安装

当我将包rgdal加载到我的R工作区时，我收到以下消息：

 Geospatial Data Abstraction Library extensions to R successfully loaded
 Loaded GDAL runtime: GDAL 2.2.3, released 2017/11/20
 Path to GDAL shared files: C:/Users/andersonch/Documents/R/win-library/3.5/rgdal/gdal
 GDAL binary built with GEOS: TRUE 
 Loaded PROJ.4 runtime: Rel. 4.9.3, 15 August 2016, [PJ_VERSION: 493]
 Path to PROJ.4 shared files: C:/Users/andersonch/Documents/R/win-library/3.5/rgdal/proj
 Linking to sp version: 1.4-1 

同样，我会认为这意味着程序包连接到的GDAL有一个有效版本

但是，当我尝试使用gdalUtils包中的函数时，会收到以下警告消息：

Warning messages:
1: In gdal_setInstallation(ignore.full_scan = ignore.full_scan, verbose = verbose) :
  No GDAL installation found. Please install 'gdal' before continuing:
    - www.gdal.org (no HDF4 support!)
    - trac.osgeo.org/osgeo4w/ (with HDF4 support RECOMMENDED)
    - www.fwtools.maptools.org (with HDF4 support)

2: In gdal_setInstallation(ignore.full_scan = ignore.full_scan, verbose = verbose) :
  If you think GDAL is installed, please run:
gdal_setInstallation(ignore.full_scan=FALSE)"

这是否意味着我需要单独安装gdal