MODISMRT投影转换工具使用说明_MRT转换投影

MODIS

MRT

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MODIS Reprojection Tool

User’s Manual

Release 4.0

February 2008

Land Processes DAAC

USGS Earth Resources Observation and Science (EROS) Center

in collaboration with the

Department of Mathematics and Computer Science

South Dakota School of Mines and Technology

MRT_Users_Manual.doc Page 1 8/26/2009

Table of Contents

Table of Contents ............................................................................. 2

Introduction ...................................................................................... 4

MODIS Reprojection Tool Capabilities ........................................... 5

MODIS Data Products .............................................................................. 5

Map Projections ......................................................................................... 5

ISIN-Enhanced GCTP ............................................................................... 5

Spectral subsetting ..................................................................................... 5

Spatial subsetting ....................................................................................... 5

Resampling ................................................................................................. 6

ISIN Shift .................................................................................................... 6

Datum Conversions .................................................................................... 6

Data Types .................................................................................................. 7

File Formats ................................................................................................ 7

Corner Coordinates ................................................................................... 7

3-Dimensional and 4-Dimensional Data Products .................................. 7

Format Conversion .................................................................................... 8

Mosaic Tool ................................................................................................. 8 

Platforms ..................................................................................................... 8

Interfaces ..................................................................................................... 9

MODIS Reprojection Tool Installation .......................................... 10

Automatic Installation ............................................................................. 11

Automatic Installation Instructions for Unix Platforms ........................................................................ 12

Automatic Installation Instructions for Windows Platforms ................................................................ 13

Manual Installation .................................................................................. 14

Manual Installation Instructions for Windows Systems ....................................................................... 15

Adding a Shortcut Icon in Windows ...................................................... 16

Building the MRT .................................................................................... 17

Parameter Files ............................................................................... 20

Log File ............................................................................................ 21

Datum Conversions ........................................................................ 21

Handling Input and Output Datums ...................................................................................................... 21

Datum Conversions .............................................................................................................................. 22

Bounding Tiles................................................................................ 23

Metadata .......................................................................................... 26

MODIS Reprojection Tool Command-Line Interface ................... 27

Command-Line Options .......................................................................... 28

MODIS Mosaic Tool Command-Line Interface ............................. 31

MODIS Reprojection Tool GUI ....................................................... 33

Resampling ............................................................................................... 33

MRT_Users_Manual.doc Page 2 8/26/2009

Introduction

The Terra Moderate Resolution Imaging Spectroradiometer (MODIS) was launched into

space as part of NASA’s Earth Observing System platform in December 1999. In

addition, Aqua MODIS was launched in May 2002. The objective of MODIS is to

provide a comprehensive series of global observations of the Earth’s land, oceans, and

atmosphere in the visible and infrared regions of the spectrum.

These observations are

critical for studies of climate, vegetation, pollution, global climate change, and many

other important economic and environmental issues.

The MODIS Reprojection Tool (MRT) was originally developed to support the first post-

launch MODIS products (version 001 and 003) which were projected to the Integerized

Sinusoidal (ISIN) mapping grid and stored in HDF-EOS (Hierarchical Data Format –

Earth Observing System).

Current version 004 and 005 MODIS data are released in the

Sinusoidal (SIN) projection and retain the HDF-EOS file format. The MRT supports all

MODIS versions and projections.

The MODIS Reprojection Tool is software designed to help individuals work with

MODIS data by reprojecting MODIS images (Level-2G, Level-3, and Level-4 land data

products) into more standard map projections. If desired, the user may reproject only

selected portions of the image (spatial subsetting) and only selected image bands (spectral

subsetting). The software outputs MODIS data in file formats that are supported by

existing software packages (raw binary and GeoTIFF) as well as HDF-EOS. The MODIS

Reprojection Tool runs on several platforms, including Sun Solaris workstations, SGI

IRIX workstations, Linux, 64-bit Linux, Microsoft Windows, and Mac OS X. The look

and feel of the software is retained across the different platforms.

The heart of the MODIS Reprojection Tool is the resampler and mrtmosaic, executable

programs that may be run either from the command-line or from the MRT Graphical User

Interface (GUI). The GUI is an easy, user-friendly way to run the MODIS Reprojection

Tool. However, individuals with intensive data processing requirements are advised to

investigate the more powerful command-line interface, which allows background

processing of large MODIS data files when the system load is light. This User’s Manual

describes how to run the resampler and mrtmosaic both from the command-line and from

the GUI.

More information about MODIS may be obtained on the Web at http://modis.gsfc.nasa.gov/.

More information about HDF and HDF-EOS may be obtained on the Web at http://hdf.ncsa.uiuc.edu and

http://hdfeos.gsfc.nasa.gov

, respectively.

MRT_Users_Manual.doc Page 4 8/26/2009

MODIS Reprojection Tool Capabilities

MODIS Data Products

The MODIS Reprojection Tool currently allows the user to reproject all gridded

(Level-2G, Level-3, Level-4) MODIS Land data products. Support for swath (Level-1

and Level-2) data products is available in the MRTSwath application.

Map Projections

The MODIS Reprojection Tool allows the user to reproject to and from the following

map projections:

• Albers Equal Area

• Equirectangular

• Geographic

• Hammer

• Integerized Sinusoidal

• Interrupted Goode Homolosine

• Lambert Azimuthal

• Lambert Conformal Conic

• Mercator

• Molleweide

• Polar Stereographic

• Sinusoidal

• Transverse Mercator

• Universal Transverse Mercator

ISIN-Enhanced GCTP

As part of this software, the Generalized Cartographic Transformation Package (GCTP)

was modified to incorporate the Integerized Sinusoidal Projection.

Spectral subsetting

Any subset of the input bands may be selected for reprojection. The default is to reproject

all input bands. (Note: the term “band” is used interchangeably with the HDF-EOS term

“Scientific Data Set” or “SDS” throughout this document.)

Spatial subsetting

Two corners (upper left and lower right) of a rectangle in input/output space may be

specified. These corners may be given as coordinates in input latitude and longitude,

input line/sample pairs, or output projection coordinates. If specifying line/sample pairs

specify as (start line, start sample) and (end line, end sample), using a zero-based

coordinate system where the upper left corner is (0, 0). When specifying input lat/long or

input line/sample, the other two rectangle corners (upper right and lower left) are

computed automatically in input space. Then all four corners are reprojected into output

space, using the specified map projection and datum. Finally, a minimum-bounding

rectangle is computed that contains the four reprojected points, in output space. All points

MRT_Users_Manual.doc Page 5 8/26/2009

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2019-06-29

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