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阅读：2666回复：2
[求助]请问光谱角法分析（SAM）的详细用法
<P>我只想问问光谱角法分析（SAM）的用法，别的无所谓。</P>
<P>请那位仁兄肯不吝赐教，多谢多谢！！</P> <P>上面的参数全用的是缩写，有些不是太明白的。</P> |
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1楼#
发布于：2005-12-30 19:15
看看说明阿<BR>
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2楼#
发布于：2007-04-25 12:39
<P>说明？与SAM窗口的不符。郁闷。</P>
<P><br> <P>Name Prompt Count Type</P> <P>FILI Database Input File Name 1-64 Char<br>DBIW Database Input Window 0-4 Int<br>DBIB Database Input Bitmap 0-1 Int<br>SPECFILE Spectrum Library File Name 1-64 Char<br>DBOC Spectral Angle Output Channels 0-1024 Int<br>DBCLASS Output Classification Channel 1-1 Int<br>SAMTHRES Angle Threshold in Degree 0-1 Real<br>ANGSCALE Output Scaling Factor for Angle 0-1 Real<br>RTLEVEL Radiometric Transformation Level 0-1 Int<br>DBIC Database Input Channel List 0-1024 Int<br>WLENINT Wavelength Interval 0-2 Real<br>VALONLY Valid Bands Only: YES/NO 0-3 Char<br>REPORT Report Mode: TERM/OFF/filename 0-64 Char</P> <P>Perform a mineral classification of a reflectance data set derived<br>from an AVIRIS hyperspectral image, and a set of laboratory-measured<br>mineral reflectance spectra.</P> <P>1. Using the Focus Spectra Plotting panel, Extract the reference<br>spectra) from splib04b.spl and write them in SPCB (USGS binary)<br>format to file ref04b.spl. The spectra of interest are the<br>following: </P> <P> file record description<br> number<br> ----------- -----------<br> 27 Alunite GDS83 Na63<br> 28 Alunite GDS82 Na82<br> 135 Dickite NMNH106242<br> 185 Halloysite NMNH106237<br> 241 Kaolinite CM9<br> 243 Kaolinite KGa-2 (pxyl)<br> 296 Montmorillonite SWy-1<br> 297 Montmorillonite SAz-1</P> <P>2. Using PCIMOD Add channels to the reflectance data (stored in<br>cupref.pix) that will hold the between-spectra angles (8 32R<br>channels) and the classification results (one 8U channel): </P> <P> EASI>FILE="cupref"<br> EASI>PCIOP="ADD"<br> EASI>PCIVAL=1,0,0,8<br> EASI>RUN PCIMOD</P> <P>3. Using SAM, perform the classification. Constrain the<br>classification to involve only the wavelength range that contains<br>absorption features for the reference spectra. Plots of the<br>reference spectra show this range to be within 800 to 2500nm. </P> <P> EASI>FILI="cupref.pix"<br> EASI>DBIW= | process entire image extent<br> EASI>DBIB= |<br> EASI>SPECFILE="ref04b.spl<br> EASI>DBCLASS=1 | newly added 8U channel is channel 1<br> EASI>DBOC=226,-233 | newly added 32R channels are channels 226 to 233<br> EASI>SAMTHRES=5 | based on trial and error<br> EASI>ANGSCALE= | no scaling<br> EASI>RTLEVEL= | use full r.t. sequence<br> EASI>DBIC= | no channel restriction on bands to use<br> EASI>WLENINT=800, 2500 | restrict bands to use to those in [800,2500nm]<br> EASI>VALONLY="yes" | use only bands with "valid" and "bmask" quality<br> EASI>report="sam.txt"</P> <P>SAM creates the following output report in sam.txt: </P> <P> SAM Spectral Angle Mapper V9.0 EASI/PACE 11:10 26Mar2003 <br><br> Name Code Channel Pixels Image<br> --------------------------------------------------------------------------------<br><br> Alunite GDS83 Na63 =a ABSREF950 (res 1 226 0 0.00<br> Alunite GDS82 Na82 =a ABSREF950 (res 2 227 897 0.07<br> Dickite NMNH106242 =a ABSREF950 (res 3 228 0 0.00<br> Halloysite NMNH106237 =a ABSREF950 (res 4 229 10 0.00<br> Kaolinite CM9 =b ABSREF950 (res 5 230 1 0.00<br> Kaolinite KGa-2 (pxyl) =b ABSREF950 (res 6 231 179 0.01<br> Montmorillonite SWy-1 =b ABSREF950 (res 7 232 57217 4.22<br> Montmorillonite SAz-1 =b ABSREF950 (res 8 233 5 0.00<br> <br> NULL (unclassified) 1296175 95.70<br> --------------------------------------------------------------------------------<br><br> Total: 1354484 100.00</P> [此贴子已经被作者于2007-4-25 12:44:23编辑过]
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