MODIS数据在遥感领域广泛使用，对于新手而言，其特有的坐标系让人摸不着头脑。当新手好不容易理解了坐标系，并使用简单的仿射变换矩阵做了投影转换，却发现投影转换后的tif影像不够精确，进一步使用数据时就会受到影响。

好在NASA官方提供的HEG(HDF-EOS To GeoTIFF Conversion Tool)工具，方便用户对HDF-EOS对象重定格式、重新投影和执行拼接/拼接和裁剪操作。它还可以重定格式和重新投影一些SMAP、VIIRS和SRTM产品。加上其直观的操作界面(虽然很丑)，或者简单的命令行模式，为新手带来福音。

HEG是MRT工具的替代版本，其运行流程具有很大的相似性，对于熟悉MRT工具的老手们，很容易转换到HEG。

每个人对数据的处理需求都有差别，今天先整理分享HEG安装方法。下载软件包。HEG的官方网站已迁移至新的位置HEG官方网站，感兴趣的可以看管网介绍内容，如果没兴趣也不要紧，点击Download，进入下载界面。官方提供了Windows、Linux、MacOS三种操作系统的适配版本，以及用户说明书，选择自己适合的版本下载即可，我使用的是Linux版本，就下载hegLNX64v2.15.Build9.8.tar.gz。

近期重新安装的时候，发现官网上无法正常下载，最后是留学在外的朋友帮忙下载的，现在分享给大家，含Linux和Windows版本的软件以及用户手册。HEG软件网盘链接如下：

提取码：j9xp

2. 安装之前，需要检查系统的java环境是否满足，一般都会有自带的，如果没有，需要自行安装java环境。

#查看java版本

java -version

# 查看java安装路径

which java

linux系统安装java环境，参考:万猫学社：详解在Linux系统中安装JDK​zhuanlan.zhihu.com

3. 然后解压安装包，会生成heg.tar和install两个文件。接着输入./install，运行安装程序;

tar -xzvf hegLNX64v2.15.Build9.8.tar.gz

./install

3. 安装过程中，根据提示，需要指定安装位置和java位置，最后随便输入一个用户名即可大功告成。

HDF-EOS To GeoTIFF Conversion Tool (HEG) Installation

----------------------------------------------------------

To install the HEG Tool:

1. The heg.tar file must be present in the current directory.

2. You must know the directory path where the HEG is to be installed.

3. You must know the path to the Java bin directory on your system.

Do you wish to proceed with the HEG v2.15 Build 9.8 installation? [y/n]

y

Where would you like to install HEG?

IMPORTANT NOTE:

Be sure to give an absolute directory path, without special characters.

For example: /home/faculty/jsmith/heg

To install HEG in a subdirectory of the current directory, just press the ENTER key.

Enter the HEG directory path:

Directory does not exist. Create /software/heg? [y/n]

y

.....Making directory /software/heg

.....Moving heg.tar to /software/heg

.....Untarring heg.tar

README

bin/HEG

bin/HEG.jar

bin/gdtif

bin/hegtool

bin/resample

bin/subset_stitch_grid

bin/subset_stitch_swath

bin/swtif

bin/subsample_grid

bin/locatemodistile

bin/HEConvert

bin/ncconvert

data/conus.las

data/conus.los

data/counties.IDX

data/counties.txt

data/datum.txt

data/File_Sinusoidal_projection_SW.pdf

data/Geoggrid_world.jpg

data/MCF_file

data/nad27sp

data/nad27sp_be

data/nad27sp_le

data/nad83sp

data/nad83sp_be

data/nad83sp_le

data/sinusoid_world.jpg

data/spc.IDX

data/spc.txt

data/spheroid.txt

data/states.IDX

data/states.txt

data/User_Strebe_WikimediaCommons.pdf

TOOLKIT_MTD/bin/

TOOLKIT_MTD/bin/winnt98/

TOOLKIT_MTD/bin/winnt98/pgs-dev-env.ksh

TOOLKIT_MTD/database/

TOOLKIT_MTD/database/common/

TOOLKIT_MTD/database/common/TD/

TOOLKIT_MTD/database/common/TD/leapsec.dat

TOOLKIT_MTD/database/common/CSC/

TOOLKIT_MTD/database/common/CSC/earthfigure.dat

TOOLKIT_MTD/database/common/CSC/utcpole.dat

TOOLKIT_MTD/database/common/EPH/

TOOLKIT_MTD/database/common/EPH/sc_tags.dat

TOOLKIT_MTD/database/common/CUC/

TOOLKIT_MTD/database/common/CUC/udunits.dat

TOOLKIT_MTD/database/common/CBP/

TOOLKIT_MTD/database/common/CBP/de200.eos

TOOLKIT_MTD/include/

TOOLKIT_MTD/include/PGS_tk.h

TOOLKIT_MTD/include/PGS_IO_L0_Wrap.h

TOOLKIT_MTD/include/PGS_CUC.h

TOOLKIT_MTD/include/makefile.CM

TOOLKIT_MTD/include/PGS_PC.h

TOOLKIT_MTD/include/PGS_AUX.h

TOOLKIT_MTD/include/PGS_IO_Gen_Wrap.h

TOOLKIT_MTD/include/PGS_PC.f

TOOLKIT_MTD/include/PGS_EPH.h

TOOLKIT_MTD/include/PGS_PC_Prototypes.h

TOOLKIT_MTD/include/PGS_MEM1.h

TOOLKIT_MTD/include/PGS_tk.f

TOOLKIT_MTD/include/PGS_TDF.h

TOOLKIT_MTD/include/PGS_math.h

TOOLKIT_MTD/include/makefile.cpp

TOOLKIT_MTD/include/PGS_TD_Prototypes.h

TOOLKIT_MTD/include/CUC/

TOOLKIT_MTD/include/CUC/utscan.h

TOOLKIT_MTD/include/CUC/makefile.CM

TOOLKIT_MTD/include/CUC/udunits_prototypes.h

TOOLKIT_MTD/include/CUC/odlparse.h

TOOLKIT_MTD/include/CUC/odldef_prototypes.h

TOOLKIT_MTD/include/CUC/odldef.h

TOOLKIT_MTD/include/CUC/udunits.h

TOOLKIT_MTD/include/CUC/utprivate.h

TOOLKIT_MTD/include/CUC/makefile.cpp

TOOLKIT_MTD/include/CUC/odlinter.h

TOOLKIT_MTD/include/CUC/makefile.CM.cpp

TOOLKIT_MTD/include/CUC/udposix.h

TOOLKIT_MTD/include/CUC/utparse.h

TOOLKIT_MTD/include/CUC/udalloc.h

TOOLKIT_MTD/include/makefile.CM.cpp

TOOLKIT_MTD/include/cfortran.h

TOOLKIT_MTD/include/PGS_MET.f

TOOLKIT_MTD/include/PGS_IO.h

TOOLKIT_MTD/include/PGS_TD.f

TOOLKIT_MTD/include/PGS_IO.f

TOOLKIT_MTD/include/PGS_MEM.h

TOOLKIT_MTD/include/PGS_TYPES.h

TOOLKIT_MTD/include/PGS_SMF.f

TOOLKIT_MTD/include/PGS_TD.h

TOOLKIT_MTD/include/PGS_IO_Gen.h

TOOLKIT_MTD/include/PGS_IO_L0.h

TOOLKIT_MTD/include/PGS_MET.h

TOOLKIT_MTD/include/PGS_SMF.h

TOOLKIT_MTD/include/PGS_CBP.h

TOOLKIT_MTD/include/PGS_CSC.h

TOOLKIT_MTD/include/tk_proto.h

TOOLKIT_MTD/lib/

TOOLKIT_MTD/lib/sgi32/

TOOLKIT_MTD/lib/sgi32/libPGSTK.a

TOOLKIT_MTD/lib/linux32/

TOOLKIT_MTD/lib/linux32/libPGSTK.a

TOOLKIT_MTD/lib/sun5/

TOOLKIT_MTD/lib/sun5/libPGSTK.a

TOOLKIT_MTD/lib/sun5.8/

TOOLKIT_MTD/lib/sun5.8/libPGSTK.a

TOOLKIT_MTD/lib/winnt98/

TOOLKIT_MTD/lib/winnt98/libPGSTK.a

TOOLKIT_MTD/runtime/

TOOLKIT_MTD/runtime/configfile.dat

TOOLKIT_MTD/src/

TOOLKIT_MTD/src/PGS_MET_GetSetFileIdName.c

TOOLKIT_MTD/src/PGS_MET_GetPCAttr.c

bin/images/downarrow.gif

bin/images/uparrow.gif

bin/findoutputgridcorners

bin/libjhdf5.so

bin/libjhdf.so

bin/HEG_Batch_Tool_Unix

bin/sinusoid_world.jpg

bin/Geoggrid_world.jpg

bin/geotiff_to_netcdf

-- Untar executed successfully! --

Where is your java bin directory located?

IMPORTANT NOTE:

Give an absolute path, without special characters.

For example: /usr/java/bin

Enter the path to your java bin directory:

/usr/bin

-- Found /usr/bin/java! --

.....Testing java version.

openjdk version "1.8.0_252"

OpenJDK Runtime Environment (build 1.8.0_252-b09)

OpenJDK 64-Bit Server VM (build 25.252-b09, mixed mode)

***********************************************************************

* IMPORTANT! The Java version must be 64 bit and 1.8 or greater. *

* *

* If your Java version is less than 1.8, ask your sysadmin to install *

* the latest version of Java, and reinstall HEG. Also if your java is *

* 32-bit, the HEG GUI Field image viewing will fail. *

***********************************************************************

Please enter a username to be used internally by HEG, (e.g. BOB):

user

*****************************************************************

* Congratulations! You have successfully installed *

* HDF-EOS To GeoTIFF Conversion Tool (HEG) v2.15 Build 9.8 on your system! *

*****************************************************************

To start HEG, type "HEG" at the command line in the

following directory:

/software/heg/bin/

4. 安装完成后，配置环境变量。除了给系统PATH添加HEG的bin目录之外，还需要配置MRTDATADIR、PGSHOME、MRTBINDIR三个目录，可参考下列我的例子。

export HEG_ROOT=/software/heg

export PATH=$HEG_ROOT/bin:$PATH

export PGSHOME=$HEG_ROOT/TOOLKIT_MTD

export MRTDATADIR=$HEG_ROOT/data

export MRTBINDIR=$HEG_ROOT/data

5. 运行，输入HEG，可以弹出界面，是不是很丑？不过其功能是很强大的，具体使用方法参考userguide了。

比较粗糙的总结，纯属为了给自己作个笔记，同时与各位交流学习。