FW: [Gdal-dev] MODIS Level 1B earth-view (EV) products
Norman Vine
nhv at cape.com
Thu May 22 13:10:44 EDT 2003
> -----Original Message-----
> From: Robert Wolfe [mailto:robert.e.wolfe.1 at gsfc.nasa.gov]
> Sent: Thursday, May 22, 2003 11:59 AM
> To: Norman Vine
> Cc: Wayne Esaias
> Subject: Fwd: FW: [Gdal-dev] MODIS Level 1B earth-view (EV) products
>
>
> Norman,
>
> Your right, the datum/ellipsoid we use is WGS84. Two references you can
> use are the ATBD and our recent MODIS geolocation paper:
>
> Nishihama, M., Wolfe, R. E., Solomon, D., Patt, F. S., Blanchette, J.,
> Fleig, A. J., Masuoka, E. (1997), MODIS Level 1A Earth Location Algorithm
> Theoretical Basis Document Version 3.0, SDST-092, Lab. Terrestrial Phys.,
> NASA Goddard Space Flight Center, Greenbelt, MD.
>
> ==> on the web at
> http://modis.gsfc.nasa.gov/data/atbd/atbd_mod28_v3.pdf
> see pages 3-8 and 3-36.
>
> and
>
> Wolfe, R. E., M. Nishihama, A. J. Fleig, J. A. Kuyper, D. P. Roy, J. C.
> Storey and F. S. Patt, Achieving sub-pixel geolocation accuracy
> in support
> of MODIS land science, Remote Sens. of Env., 83 (1-2): 31-49, Nov. 2002.
>
> ==> see page 35, end of second column.
>
> I hope this helps,
>
> -Robert Wolfe
>
> *--------*---------*---------*--------*---------*--------*
> Robert E. Wolfe
> MODIS Land Science Team Support
> GSFC: Code 922, Bld. 32, Rm. S036G Raytheon ITSS
> p. 301-614-5508 f. 301-614-5269 4400 Forbes Blvd.
> e. robert.e.wolfe.1 at gsfc.nasa.gov Lanham, MD 20706
> *--------*---------*---------*--------*---------*--------*
>
Robert
This helps a lot, thank you very much !
FYI I am working on a method to automate run time updating
of the BMV texture using GDAL see
http://www.andesengineering.com/BlueMarbleViewer/
Also note that thanks to Andrey et al GDAL now provides
*cross-platform* < Unix, Mac, Win32 > methods that should
facilitate using MODIS data
for example to get a tiff image of the CZS pigment from
MODOCL2A.A2000341.1705.004.2002171004055.hdf
one can use the general purpose gdal_translate tool, or easily
create your own with the library if a C or Python programmer
ie
% gdal_translate -of GTiff -ot UInt16 \
HDF4_SDS:MODIS_LIB:MODOCL2A.A2000341.1705.004.2002171004055.hdf:0 test.tif
Input file size is 1354, 2030
0...10...20...30...40...50...60...70...80...90...100 - done.
and a Tiff image with the pertinent metadata stuffed into
the Header Tags is created :)
The metadata can be seen using the gdalinfo tool
or any tool capable of reading Tiff tags
i.e
% gdalinfo test.tif
Driver: GTiff/GeoTIFF
Size is 1354, 2030
Coordinate System is `'
Metadata:
Miami Format=10
Number of bands=17
Number of samples per record=1354
............
LONGNAME=MODIS/Terra Ocean Color Derived Products Group 1 5-Min L2 Swath
1km Day
Long_name=Chlorophyll-a + pheopigment (fluorometric, empirical)
Scale_type=y= Slope * x + Intercept;
Slope=0.002
Intercept=-5
Name=Pigment
Units=mg/m^3
Quality_Bits=25-26
Corner Coordinates:
Upper Left ( 0.0, 0.0)
Lower Left ( 0.0, 2030.0)
Upper Right ( 1354.0, 0.0)
Lower Right ( 1354.0, 2030.0)
Center ( 677.0, 1015.0)
Band 1 Block=1354x3 Type=UInt16, ColorInterp=Gray
Cheers
Norman
==============================
> >User-Agent: Microsoft-Entourage/10.1.1.2418
> >Date: Thu, 22 May 2003 10:08:50 -0400
> >Subject: FW: [Gdal-dev] MODIS Level 1B earth-view (EV) products
> >From: Wayne Esaias <wayne.e.esaias at nasa.gov>
> >To: Robert Wolfe <robert.e.wolfe.1 at gsfc.nasa.gov>
> >CC: <nhv at cape.com>
> >
> >robert - could you please direct
> >Norman to the appropriate place for this
> >information. Norman attended the UNH
> >Ocean Workshop, and is doing some really
> >cool stuff.
> >thanks,
> >Wayne
> >
> >
> >Dr. Wayne E. Esaias
> >Oceanographer
> >Code 971 Oceans and Ice Branch
> >Goddard Space Flight Center
> >Greenbelt MD 20777
> >301-614-5709
> >
> >--
> >
> >
> >------ Forwarded Message
> >From: "Norman Vine" <nhv at cape.com>
> >Reply-To: <nhv at cape.com>
> >Date: Wed, 21 May 2003 13:46:23 -0400
> >To: "Wayne Esaias" <wayne.e.esaias at nasa.gov>
> >Subject: FW: [Gdal-dev] MODIS Level 1B earth-view (EV) products
> >
> >Hi
> >
> >I am wondering if there is some official documentation for the
> >coordinate system used in the MODIS products for the Latitude
> >and Longitude fields.
> >
> >FYI
> >We are working on improving MODIS support in the GDAL library
> >< Geospatial Data Abstraction Library >
> >http://www.remotesensing.org/gdal/
> >
> >Thanks
> >
> >Norman Vine
> >Woods Hole, Ma
> >
> > > -----Original Message-----
> > > From: gdal-dev-admin at remotesensing.org
> > > [mailto:gdal-dev-admin at remotesensing.org]On Behalf Of Andrey Kiselev
> > > Sent: Wednesday, May 21, 2003 1:00 PM
> > > To: gdal-dev at remotesensing.org
> > > Subject: Re: [Gdal-dev] MODIS Level 1B earth-view (EV) products
> > >
> > >
> > > On Wed, May 21, 2003 at 12:20:11PM -0400, Norman Vine wrote:
> > > > > 2. I dont know what coordinate system (datum and
> ellipsoid) used for
> > > > > MODIS L1B GCPs. If somebody can point me to appropriate
> > > documentation,
> > > > > please, do it.
> > > >
> > > > I am 'reasonably sure' it is WGS84 but I can't seem to find a
> > > reference for
> > > > this
> > >
> > > I'm also sure in this, but it is nowhere explicitly stated...
> > >
> > >
> > > --
> > > Andrey V. Kiselev
> > > Home phone: +7 812 5274898 ICQ# 26871517
> > > _______________________________________________
> > > Gdal-dev mailing list
> > > Gdal-dev at remotesensing.org
> > > http://remotesensing.org/mailman/listinfo/gdal-dev
> > >
> >
> >
> >------ End of Forwarded Message
>
More information about the Gdal-dev
mailing list