Re: [GRASS-user] Error while exporting
On Wed, May 18, 2011 at 10:29 AM, Glynn Clements gl...@gclements.plus.com wrote: Markus Metz wrote: The NULL value of the reclass map is not recognized as NULL value, but instead treated as a valid number. This seems to be a bug in the GRASS library, specifically in G_get_null_value_row() and has probably been around since GRASS 6.3. AFAICT, it has been around as long as G_get_null_value_row() has existed. G_get_null_value_row() returns the raw data, without any reclass applied. As it stands, this function probably isn't of much use. Remove? No, fix (as per r46323). Done in r46345, r46346. If you only care about whether a cell is null or non-null, reading and decoding the actual data is needless overhead. If you need to read the data anyhow, then use that rather than reading the null data a second time (the raw data is cached, but conversion and masking will be re-done). r.out.gdal was the latter case, so it shouldn't have been using that function. OGSF is also the latter case, and should be fixed. OGSF fixed in r46347 for trunk. This is an enhancement, no bug because [Rast|G]_get_null_value_row is fixed, so the OGSF change does not need to be backported. Markus M ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] mediawiki: recorded desktop sessions
Hi all, 2011/4/26 Hamish hamis...@yahoo.com: Aren wrote: embed Youtube videos on appropriate Mediawiki pages. this looks promising: http://www.mediawikiwidgets.org/YouTube I have installed mediawiki widget extension and create special template for including youtube videos [1]. See also wxGUI Modeler page for the usage [2]. Martin [1] http://grass.osgeo.org/wiki/Template:YouTube [2] http://grass.osgeo.org/wiki/WxGUI_Modeler#HowTo -- Martin Landa landa.martin gmail.com * http://geo.fsv.cvut.cz/~landa ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
RE: [GRASS-user] Convert Floating Point Raster to Integer Raster
Si. Os mande un correo ayer. Enviado desde mi Nokia -Mensaje original- De: Michael Morin Enviado: 19/05/2011 01:04:49 Para: grass-user@lists.osgeo.org Asunto: [GRASS-user] Convert Floating Point Raster to Integer Raster Techies, In ArcInfo I used to write .aml code to covert Floating Point Grids to Integer Grids. Doing this produced a .vat table in the new Integer grid thereby giving me elevation data which i could then used to develop painted DEMS. Question...? Would r.mapcalc or r.reclass be the tools I would use?..could someone share some example code how I would make this conversion? I will sum. Bonjour. Michael D. Morin mmo...@cassblue.com ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] Possible to model exatmospheric radiation with r.sun?
On Monday, May 16, 2011, Jonathan Greenberg wrote: Folks: I was wondering if there is a way to turn the atmosphere off in r.sun, and model a top of atmosphere radiation? --j Hi Jonathan, If you check out the metadata associated with the output from r.sun, you will find the following: (note the Extraterrestrial irradiance entry) r.info rad_beam.187 ++ | Layer:rad_beam.187 Date: Thu Mar 24 17:17:43 2011 | | Mapset: PERMANENT Login of Creator: dylan | | Location: ca630 | | DataBase: /home/dylan/grass | | Title: ( rad_beam.187 ) | | Timestamp: none | || | | | Type of Map: raster Number of Categories: 255 | | Data Type:FCELL | | Rows: 1396 | | Columns: 553 | | Total Cells: 771988 | |Projection: UTM (zone 10) | |N:4235950S:4221990 Res:10 | |E: 697230W: 691700 Res:10 | | Range of data:min = 4492.042 max = 7758.583 | | | | Data Description: | |generated by r.sun | | | | Comments: | | | | Day [1-365]: 187 | | Solar constant (W/m^2): 1367 | | Extraterrestrial irradiance (W/m^2): 1321.303439 | | Declination (rad):0.396193 | | Latitude min-max(deg):38.1250 - 38.2500 | | Sunrise time min-max (hr.): 4.72 - 4.72 | | Sunset time min-max (hr.):19.28 - 19.28 | | Time step (hr.): 0.5000 | | Linke turbidity factor: 3.0 | | Ground albedo:0.200 | | - | | | |r.sun -s elevin=ned10m aspin=aspect10m aspect=270 slopein=slope\ | |10m slope=0.0 lin=3.0 alb=0.2 beam_rad=rad_beam.187 day=187 step=\ | |0.5 dist=1.0 numpartitions=1 | -- Jonathan A. Greenberg, PhD Assistant Project Scientist Center for Spatial Technologies and Remote Sensing (CSTARS) Department of Land, Air and Water Resources University of California, Davis One Shields Avenue Davis, CA 95616 Phone: 415-763-5476 AIM: jgrn307, MSN: jgrn...@hotmail.com, Gchat: jgrn307 ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user -- Dylan E. Beaudette USDA-NRCS Soil Scientist California Soil Resource Lab http://casoilresource.lawr.ucdavis.edu/ ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
RE: [GRASS-user] Re: i.atcorr returns all NULL values
p192 r030 image of July 2003 of Italy (L5TM) successfully corrected for
band 1 and 2.
The following script works well in GRASS GIS Trunk SVN.
Please try.
#!/bin/bash
echo Part 0 (Import in GRASS GIS)
echo RUN from the MTL.txt directory and within the GRASS environment
echo ---
echo It will create for *.[1-7] images from r.in.gdal
echo image=DN
# DEM file name
dem=dem
r.mapcalc expression=dem=5.0
# r.in.gdal input=$dem output=$dem
for file in L5*.TIF
do
out=$(echo $file | sed
's/\(.*\)_\(.*\)_B\(.*\)0.TIF/\1\_\2\.\3/g')
echo $out
r.in.gdal --overwrite input=$file output=$out
done
echo Part 1 (After DN)
echo ---
echo It will create for *.toar.* images from i.landsat.toar
echo image=top of atmosphere reflectance
for L5_MTL_file in L5*_MTL.txt
do
L5_prefix=$(echo $L5_MTL_file | sed 's/\(.*\)_MTL.txt/\1/')
i.landsat.toar -t input_prefix=$L5_prefix\.
output_prefix=$L5_prefix\.toar. metfile=$L5_MTL_file sensor=tm5
done
echo Part 2 (After TOAR)
echo ---
echo It will create for *.surf.* images from i.atcorr
echo Atmospherically corrected image=surface reflectance
#-
# For i.atcorr scripting
#-
vis_list=(10 10 8 9.7 15 8 7 10 10 9.7 12 9.7 7 12 12 12 3 15 12 9.7 6
15)
vis_len=${#vis_list[*]}
echo $vis_len
i=0
# Location of parameter file
root=~/
# Basic script for i.atcorr for L 5 TM
#Geometrical conditions (L5TM)
geom=7
#Sensor height (satellite is -1000)
sens_height=-1000
#Atmospheric mode
atm_mode=6 #us standard 62 (for lack of more precise model)
#Aerosol model
aerosol_mode=1 #continental
#satellite band number (L5TM [25,26,27,28,29,30])
satbandno=25 #Band 1 of L5TM is first to undergo atmospheric correction
for file in $(g.mlist type=rast pattern=*.toar.1)
do
#Here we suppose you have altitude (DEM) and Visibility (VIS) maps
ready
#---
r.mapcalc expression=visibility=${vis_list[$i]} --overwrite
# Dummy visibility value for atcorr param file
vis=12
#Increment i
i=$(echo $i + 1 | bc)
#Altitude dummy value (in Km should be negative in this param file)
#(overwritten by DEM raster input)
alt=-1.200
# L5 basename as stored in GRASS GIS and used by i.landsat.toar
L5basename=$(echo $file | sed 's/\(.*\)\.\(.*\)\.\(.*\)/\1/')
echo $L5basename
#---
# Please change as you need
#---
#datetime of satellite overpass (month, day, GMT decimal hour)
echo Input: GMT (i.e. 6.30)
read gmt
#mdh=6 03 6.30
monthday=$(echo $L5basename | sed 's/\(.*\)_...\(.*\)/\2/')
day=$(echo $L5basename | sed 's/\(.*\)_.\(.*\)/\2/')
month=$(echo ($monthday - $day) / 100 | bc)
mdh=$month $day $gmt
echo $mdh
# Central Lat/Long
north=$(g.region -p | grep north | sed 's/north:\ \(.*\)/\1/' | bc)
south=$(g.region -p | grep south | sed 's/south:\ \(.*\)/\1/' | bc)
east=$(g.region -p | grep east | sed 's/east:\ \(.*\)/\1/' | bc)
west=$(g.region -p | grep west | sed 's/west:\ \(.*\)/\1/' | bc)
Lat_nonproj=$(echo (($north - $south)/2.0) + $south | bc )
Long_nonproj=$(echo (($east - $west)/2.0) + $west | bc )
echo $Long_nonproj $Lat_nonproj tempfile.txt
Long=$(m.proj -o -d input=tempfile.txt | sed
's/\(.*\)|\(.*\)|\(.*\)/\1/')
Lat=$(m.proj -o -d input=tempfile.txt | sed
's/\(.*\)|\(.*\)|\(.*\)/\2/')
echo $Long_nonproj $Lat_nonproj
echo $Long $Lat
for bandno in 1 2 3 4 5 7
do # Generate the parameterization file
echo $geom- geometrical
conditions=Landsat 5 TM $root/param_L5.txt
echo $mdh $Long $Lat - month day hh.ddd longitude latitude
(\hh.ddd\ is in decimal hours GMT) $root/param_L5.txt
echo $atm_mode- atmospheric
mode=tropical $root/param_L5.txt
echo $aerosol_mode- aerosols
model=continental $root/param_L5.txt
echo $vis - visibility [km] (aerosol
model concentration), not used as there is raster input
$root/param_L5.txt
echo $alt - mean target elevation above sea
level [km] (here 600m asl), not used as there is raster input
$root/param_L5.txt
echo $sens_height- sensor height (here,
sensor on board a satellite) $root/param_L5.txt
echo $satbandno - 'i'th band of TM
Landsat 5 $root/param_L5.txt
# Process band-wise atmospheric correction with 6s
cat $root/param_L5.txt
echo i.atcorr -r input=$L5basename.toar.$bandno elevation=$dem
visibility=visibility parameters=$root/param_L5.txt
output=$L5basename.surf.$bandno range=0,1 rescale=0,1 --overwrite
i.atcorr -r input=$L5basename.toar.$bandno elevation=$dem
visibility=visibility parameters=$root/param_L5.txt
output=$L5basename.surf.$bandno range=0,1 rescale=0,1 --overwrite
satbandno=$((satbandno+1))
Re: [GRASS-user] Possible to model exatmospheric radiation with r.sun?
Jonathan Greenberg wrote: I was wondering if there is a way to turn the atmosphere off in r.sun, and model a top of atmosphere radiation? I wonder if it enough to keep the cloud coefficients (i.e. coefbh, coefdh r.rescale'd GRIB files) at the default clear-sky conditions, and set the Linke coefficient at lin=1.00. then compare how well the direct beam result matches the solar constant? (aka the see what happens experimental approach) Hamish ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
[GRASS-user] Classifying single landcover
Hi all! For my work I am interested in identifying a single kind of vegetation from LANDSAT Images. If I use signature file with just one signature class(I take many training sites all over the area), the classified image with i.maxlik appears full pink. On the other hand if I randomly pick training sites for one more class(water) and have two classes in the signature file this does not happen. So I am wondering will it not be possible to use a single class's signature sites for supervised classification. Thanks and regards, Chethan S. ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
[GRASS-user] Synchronizing two displays
Hi list, I'm using the latest GRASS 7 svn update, and I wonder if it there is an option to synchronize two displays? Indeed, I can open as many displays as I want (FileMap display New) but what would be great, to compare layers, would be to force each display window to show the same spatial extent. Cheers, Pierre -- Scientist Landcare Research, New Zealand ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
