Hi,
I'm trying to write and read multispectral, well actually only
dual-wavelength pulses and points in SPD files with python. But I have a
question about the indexing of the pulses and points as well as getting
pulses and points at specific locations of one wavelength.
I checked out Pete's paper on SPD format. The SPD treats each wavelength as
a separate pulse. Then all pulses at the two wavelengths will stack
together in the "DATA"->"PULSES". But I don't find clear explanation about
how the spd will index multiple wavelengths. I think SPD does it
automatically by checking out the SCANLINE and SCANLINE_IDX of each pulse
and the simultaneous pulses of different wavelengths have the same SCANLINE
and SCANLINE_IDX. Then one indexing dataset can give you all pulses of all
wavelengths. Then when I read spd file of dual wavelengths, say I read a
row in the spatial index, does it give me all the pulses at both
wavelengths? Then I can pick out the wavelength of interest by myself. But
what about getting the points associated with those pulses? I guess I could
get the point indices from those select pulses of one wavelength but then
the indices of the points won't be a continuous chunk in the
"DATA"->"POINTS". Then I would loop through the select pulses of one
wavelength and generate a list of point indices from PTS_START_IDX and
NUMBER_OF_RETURNS. But this sounds so troublesome and inefficient. Is there
any better way to do it in SPDlib? Or other suggestion for python?
Thanks,
Zhan.
--
Zhan Li, 李展;
Earth & Environment, Boston University, USA;
2008 - 2011, in Chinese Academy of Sciences, China;
2004 - 2008, in Nanjing University, China;
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