ILWIS3.8帮助文档.pdf-资料库

55d531db-221d-44f9-b318-98fa98d8052b.pdf-第1页.png

第1页 / 共46页

55d531db-221d-44f9-b318-98fa98d8052b.pdf-第2页.png

第2页 / 共46页

55d531db-221d-44f9-b318-98fa98d8052b.pdf-第3页.png

第3页 / 共46页

55d531db-221d-44f9-b318-98fa98d8052b.pdf-第4页.png

第4页 / 共46页

55d531db-221d-44f9-b318-98fa98d8052b.pdf-第5页.png

第5页 / 共46页

55d531db-221d-44f9-b318-98fa98d8052b.pdf-第6页.png

第6页 / 共46页

55d531db-221d-44f9-b318-98fa98d8052b.pdf-第7页.png

第7页 / 共46页

55d531db-221d-44f9-b318-98fa98d8052b.pdf-第8页.png

第8页 / 共46页

Practical Session Instructions Earth Observation of Water Resources (SEBS) Prof. Bob Su & M.Sc. Lichun Wang ITC, University of Twente The Netherlands (July 2013)

Contents Introduction .................................................................................................................... 1 Exercise 1: Preparing MODIS Level 1B data as input for SEBS .................................. 2 1.1 Preparing software for using MODIS products ................................................... 2 1.1.1 HDFView ...................................................................................................... 2 1.1.2 ModisSwathTool ........................................................................................... 2 1.2 Ordering and downloading the data ..................................................................... 3 1.3 Getting familiar with the MODIS data with HDFView tool ............................... 5 Exercise 2: Processing MODIS Level 1B data for use in SEBS for ILWIS .................. 9 2.1 Introduction .......................................................................................................... 9 2.2 Install ILWIS and BEAM software ..................................................................... 9 2.3 Main Processing Steps ....................................................................................... 10 2.3.1 Step I: Reprojecting MODIS Level-1B Data .............................................. 11 2.3.2 Step II: Importing GeoTIFF files into ILWIS raster files ........................... 15 2.3.3 Step III: Pre-processing Tools for SEBS .................................................... 17 2.3.4 Step VI: Running SEBS core module (Surface Energy Balance System) .. 29 2.4 References: ......................................................................................................... 34 Exercise 3: BEAM plug-in for SEBS .......................................................................... 37 3.1 Generating SMAC outputs in BEAM ................................................................ 37 3.2 Generating SEBS outputs .................................................................................. 39 3.2.1 SEBS requested meteorological and radiation input values ....................... 39 3.2.2 SEBS requested satellite input files ............................................................ 40 3.2.3 SEBS Landuse Parameters .......................................................................... 42 3.3 References .......................................................................................................... 43

WATER RESOURCES (SEBS) Exercise 1 Introduction This practical contains three exercises related to earth observation of water resources. These exercises were developed originally for the ESA-MOST Dragon programme advanced training course in land remote sensing. Exercise 1 deals with the preparation of MODIS Level 1B data as input for SEBS, which includes preparing software for reading MODIS products, ordering and downloading the MODIS Level_1B data, and viewing and getting familiar with the MODIS data products in HDF format. Exercise 2 leads you though the different steps in processing satellite data (e.g. MODIS Level-1B data) in the ILWIS system (Integrated Land and Water Information System, an open source Remote sensing and GIS system developed by ITC, University of Twente, downloadable from http://www.itc.nl/research_programme, following the ‘ILWIS - Remote Sensing and GIS software’ link). In a step by step procedure, this exercise enables you to derive land surface geophysical parameters and energy balance components, including evaporation rate. Exercise 3 describes similar steps as in Exercise 2 but using the BEAM software environment (http://www.brockmann-consult.de/cms/web/beam/). BEAM is an open-source toolbox and development platform for viewing, analysing and processing of remote sensing raster data. BEAM supports image data from Envisat's optical instruments, raster data formats such as GeoTIFF and NetCDF as well as data formats of other EO sensors from MODIS, AVHRR, AVNIR, PRISM to CHRIS/Proba. Various data and algorithms are supported by dedicated extension plug-ins. Similarly you go though the different steps in processing satellite data (e.g. AATSR Level-1B data) to derive surface geophysical parameters and energy balance components, including evaporation rate by using the SEBS plug-in. 1

Exercise 1 WATER RESOURCES (SEBS) By Lichun Wang, July, 2012 Exercise 1: Preparing MODIS Level 1B data as input for SEBS In this exercise we will apply various procedures to estimate evaporation from MODIS L1B products (L1B is radiometricaly calibrated, but not atmospherically corrected data). The tasks in this exercise are to perform: • Preparing the software for MODIS products • Ordering and downloading the MODIS Level_1B data • Viewing and Getting familiar with the MODIS data products (HDF datasets) used in this exercise 1.1 Preparing software for using MODIS products 1.1.1 HDFView HDFView is a tool for browsing and viewing the contents of HDF files. The software can be downloaded from http://www.hdfgroup.org/hdf-java-html/hdfview/ If not installed already, installed the package as follows: 1. Type hdfview_install_windows_novm.exe to install 2. Start from Start -> programs -> HDFView 2.8 -> HDFView 2.8 Note: Before the installation of the software, Java JDK1.5.0 (or higher) must be installed on your machine. 1.1.2 ModisSwathTool The Modis Reprojection Tool Swath allows you to reproject swath MODIS level-1 and level- 2 data products. It is free and can be obtained from: http://lpdaac.usgs.gov/landdaac/tools/mrtswath/index.asp In this exercise, assuming you have downloaded the software as the zip file MRTSwath.zip. 1. Unzip the MRTSwath software to a folder, for example, D:\MRTSwath directory. 2. Edit the ModisSwathTool.bat file in D:\MRTSwath\bin directory. You will need to update the MRTDATADIR to the MRTSwath data directory, the path to the Java executable, and the path to the ModisSwathTool.jar file. For example, the Java executable path is C:\Program Files\Java\jre1.5.0_11\bin, and the MRTSwath is installed in the D:\MRTSwath directory, the sample ModisSwathTool.bat file looks like as follows: - - set MRTDATADIR=D:\MRTSwath\data "c:\WINDOWS\system32\java.exe" –classpath "D:\MRTSwath\bin\ModisSwathTool.jar" mrtswath.ModisSwathTool Note that the blue statement is all on one line. Do not break this statement into multiple lines! 2

Exercise 1 WATER RESOURCES (SEBS) 3. Start MRTSwath with ModisSwathTool.bat from the D:\MRTSwath\bin directory, or to create a shortcut to MRTSwath, and click on the shortcut. 1.2 Ordering and downloading the data For this exercise, you will be using the following MODIS products, covering the Naqu site on the Tibetan plateau, China: MODIS calibrated L1B swath file: MODIS L1B file MOD021KM.A2008186.0430.005.2010188194504.hdf Geolocation L1A file: MOD03.A2008186.0430.005.2008186113434.hdf Corresponding to an overpass on July 4, 2008 (Julian day186), recorded at 04:30 GMT. You can order these products from NASA’s LAADS Web: http://ladsweb.nascom.nasa.gov/browse_images Figure 1.1 Overview of the web page for MODIS data downloads For downloading MODIS L1B product, Clicking on DATA filed, then clicking on Search for MODIS level 1, atmosphere and land products. The page that corresponds to this selection is shown in the picture below: 3

Exercise 1 WATER RESOURCES (SEBS) Figure 1.2 Overview of MODIS data search Select the following options for: Satellite/Instrument: Terra MODIS Group: Terra Level 1 Products Products MOD021KM – Level 1B Calibrated Radiances – 1km MOD03 – Geolocation – 1km Search Date and Time Start Date and Time: 04/07/2008 Time (UTC): 04:00:00 End Date and Time: 04/07/2008 Time (UTC): 05:00:00 Collection Selection 5 or 51 Special Selection Latitude/Longitude Search Area Type in Lat/Lon range Northern latitude: 35 Southern latitude: 27 West longitude: 86 4

WATER RESOURCES (SEBS) Exercise 1 East longitude: 95 Figure 1.3 Overview of selected MODIS data coverage Coverage Selection Day (containing day data only) Clicking on Search The search should find two images having the following names on your screen after some time: MOD021KM.A2008186.0430.005.2010188194504.hdf MOD03.A2008186.0430.005.2008186113434.hdf Note that July 4, 2008 is day-of-year 186. Note: You can preview the scenes. Clicking on Order Files Now Providing your e-mail address, and checking FTP pull option, and then clicking “Order”. After this is done you will receive an e-mail informing you that your order has been received. Within some time (it may take several hours, or one or two days), you will receive an e-mail with FTP details, with which you can download the data. Sometimes it can take quite some time to order the data. In order to speed up the exercise, the above two files are provided to you, which are located in the MODISL1B directory. 1.3 Getting familiar with the MODIS data with HDFView tool Run HDFView You can run the HDFView from 5

WATER RESOURCES (SEBS) Exercise 1 Start->Program Files->HDFView2.8 Open a file: You can either click the “open” button or select the “open” from the file menu. In the Open file pop up window, choose this file MOD021KM.A2008186.0430.005.2010188194504.hdf After you open this file, the structure of the file is displayed in the tree panel on the left side of the Main Window. View data content: Double click “MODIS_SWATH_Type_L1B”, and then double click “Data Fields” to see the content of the data fields (see picture below). Figure 1.4 Overview of the tree panel of the Main Window Examine the band attributes of the file: To view the attributes of data fields, you can right click an individual field e.g. EV_250_Agg1km_RefSB, in the context-menu, then select “Show Properties” menu, then in the pop up window, click on Attributes tab. The following figure shows an example of the information of the selected data field. 6

资料库

ILWIS3.8帮助文档.pdf

相关推荐

行业

热门标签

最新资料