[GRASSLIST:4097] Re: BSQ import question
Markus Neteler
neteler at itc.it
Wed Aug 4 12:11:35 EDT 2004
(cc GDAL list, due to potential ENVI driver issues
ref:
http://xserve.flids.com/pipermail/gdal-dev/2004-May/005648.html
Sorry if you receive it twice.
)
[ The question was how to import a BSQ file into GRASS.
I'll suggest to create an ENVI hdr file ]
On Tue, Aug 03, 2004 at 09:20:36AM -0600, C.S. Cornuelle wrote:
> Yes, I know, use i.tape.other. :^)
>
> The problem (hopefully) is that I do not know some of the particulars
> which i.tape.other requires. The file to import is
>
> gl-latlong-1km-landcover.bsq
> from
> http://glcfapp.umiacs.umd.edu:8080/esdi/index.jsp
The global land cover file is at:
ftp://ftp.glcf.umiacs.umd.edu/glcf/Global_Land_Cover/Global/gl-latlong-1km-landcover/
Information
Image Size: 43200 Pixels 21600 Lines
Quantization: 8-bit unsigned integer
Output Georeferenced Units: LONG/LAT E019
Projection: Geographic (geodetic)
Earth Ellipsoid: Sphere, rad 6370997 m
Upper Left Corner: 180d00'00.00" W Lon90d00'00.00" N Lat
Lower Right Corner: 180d00'00.00" E Lon 90d00'00.00" S Lat
Pixel Size (in Degrees): 0.00833 Lon 0.00833 Lat
(Equivalent Deg,Min,Sec): 0d00'30.00"0d00'30.00"
UpLeftX: -180
UpLeftY: 90
LoRightX: 180
LoRightY: -90
-> note the Sphere!
This is relevant for the definition of the location.
See 'gl-latlong-1km-landcover.grasslocation.txt' attachment for details.
> Some of you are probably familiar with this. Assuming this, I
> have a few questions from GRASS 5.3.
[...]
> Any ideas? Has anyone worked with this data set? I'm running this on
> a linux box, if it matters.
Use r.in.gdal instead. It's way easier. You just have to generate
a BSQ ENVI header file, then import the map (find attached the file).
I hope I got that file right, following
http://glcf.umiacs.umd.edu/data/guide/fileformat/bsq.shtml
=> RSI ENVI 3.6
However, I didn't set bands = 14 but bands = 1
Now check with 'gdalinfo':
gdalinfo -mm gl-latlong-1km-landcover.bsq
Driver: ENVI/ENVI .hdr Labelled
Size is 43200, 21600
Coordinate System is:
LOCAL_CS["Geographic Lat/Lon",
UNIT["Meter",1]]
Origin = (-180.000000,90.000000)
Pixel Size = (0.00833333,-0.00833333)
Corner Coordinates:
Upper Left (-180.0000000, 90.0000000)
Lower Left (-180.0000000, -90.0000000)
Upper Right ( 180.0000000, 90.0000000)
Lower Right ( 180.0000000, -90.0000000)
Center ( -0.0000000, 0.0000000)
Band 1 Block=43200x1 Type=Byte, ColorInterp=Undefined
Computed Min/Max=0.000,13.000
IMHO the projection is not detected completely by GDAL,
or should it be LOCAL_CS?
If you prefer, you can also make it a GeoTIFF file,
fixing the projection description in this moment:
gdal_translate -a_srs '+init=esri:37008' \
gl-latlong-1km-landcover.bsq gl-latlong-1km-landcover.tif
gdalinfo -mm gl-latlong-1km-landcover.tif
Driver: GTiff/GeoTIFF
Size is 43200, 21600
Coordinate System is:
GEOGCS["unnamed ellipse",
DATUM["unknown",
SPHEROID["unnamed",6370997,1]],
PRIMEM["Greenwich",0],
UNIT[,0.0174532925199433]]
Origin = (-180.000000,90.000000)
Pixel Size = (0.00833333,-0.00833333)
Corner Coordinates:
Upper Left (-180.0000000, 90.0000000)
Lower Left (-180.0000000, -90.0000000)
Upper Right ( 180.0000000, 90.0000000)
Lower Right ( 180.0000000, -90.0000000)
Center ( -0.0000000, 0.0000000)
Band 1 Block=43200x1 Type=Byte, ColorInterp=Gray
Computed Min/Max=0.000,13.000
Then import:
(color table from
http://glcf.umiacs.umd.edu/data/landcover/data.shtml
)
r.in.gdal in=gl-latlong-1km-landcover.tif out=gl-latlong-1km-landcover
r.colors gl-latlong-1km-landcover col=rules <<EOF
0 000 000 000
1 001 100 000
2 001 130 000
3 151 191 071
4 002 220 000
5 000 255 000
6 146 174 047
7 220 206 000
8 255 173 000
9 255 251 195
10 140 072 009
11 247 165 255
12 255 199 174
13 000 255 255
EOF
d.mon x0
d.rast.leg gl-latlong-1km-landcover
Regards
Markus Neteler
-------------- next part --------------
ENVI
samples = 43200
lines = 21600
bands = 1
header offset = 0
file type = ENVI Classification
data type = 1
interleave = bsq
byte order = 0
map info = {Geographic Lat/Lon, 1.0, 1.0, -180.0, 90.0, 0.00833333333333, 0.00833333333333, sphere, units=Degrees}
band names = {
Band 1}
-------------- next part --------------
This is relevant for the definition of the
gl-latlong-1km-landcover location.
Please specify the coordinate system for location <sphere>
B Latitude-Longitude
you wish to specify a geodetic datum for this location?(y/n) [y] y
Please specify datum name
Enter 'list' for the list of available datums
or 'custom' if you wish to enter custom parameters
Hit RETURN to cancel request
> [nothing]
Please specify ellipsoid name
Enter 'list' for the list of available ellipsoids
Hit RETURN to cancel request
>sphere
Radius: 6370997
Location boundaries:
====== DEFAULT REGION =======
| NORTH EDGE:90N_______ |
| |
WEST EDGE | |EAST EDGE
180W______ | |180E______
| SOUTH EDGE:90S_______ |
=============================
PROJECTION: 3 (Latitude-Longitude) ZONE: 0
GRID RESOLUTION
East-West: 0:00:30___
North-South: 0:00:30___
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