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1 Replies and 1218 Views
Gridding or interpolation 1218 1
Started by Deleted User
Hi all,
I have Longitude x latitude of temperature data sets.
Using this data I am able to plot the global map.
The size of the data set is
Longitue: 144 (0,2.5,5.0 ..... 357.5) and interval is 2.5 degree
Latitude=73 (-90,-87.5,-85.0,.....90.0) and interval is 2.5 degree
Temperature=144 x 73
I want to make a grid points of 10 x 5
longitude=0,10,20,....360. (10 degree interval)
latitude=-90.,-85.,-80,.....85,90 (5 degree intervals)
how to make 10 x 5 grid of the tem...
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1 |
1218 |
08 Jun 2007 08:09 AM |
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1 Replies and 1475 Views
Compiling and running *.pro file (Entropy Calculation) 1475 1
Started by Deleted User
Dear IDL forum,
I am a regular ENVI user who has little or no experience in IDL. I downloaded some IDL code for calculating the entropy value of an image.
http://astrosun2.astro.cornell.edu/research/projects/compression/entropy.html
I am now trying to compile and run the code in IDL but am having trouble with the usage:
I open and compile the *.pro file then run it using the following command.
entropy_value = entropy_func(my_image)
I then get the following error message :
Struct e...
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1 |
1475 |
04 Jun 2007 02:41 PM |
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0 Replies and 1118 Views
Contractual IDL positions 1118 0
Started by Deleted User
Hi,
I'm a seasoned (13 yrs) IDL programmer in the Medical/Microscopy imaging field.
Does anybody know of companiy(s) that use independent contractors for their IDL
programming needs
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1118 |
02 Jun 2007 01:05 PM |
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1 Replies and 1205 Views
Getting Fraction of diffuse light (Fdl)values from Skyl_lut.dat table 1205 1
Started by Deleted User
I have been thinking about calculating Actual albedo (Aa) with white sky albedo (Albedo_ws) and black sky albedo (Albedo_bs) retrieved from MODIS43 image for several days.
As many of you may know, MODIS43 images have only Albedo_ws and Albedo_bs info, and we need additional value, fraction of diffuse light (Fdl), to calculate Aa. If these values are ready we can calculate Aa this way.
Aa = Albedo_ws * Fdl Albedo_bs * (1-Fdl)
Fdl values are provided through the skyl_lut.dat table and...
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1 |
1205 |
02 Jun 2007 12:18 PM |
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1 Replies and 1113 Views
error from envi_stats_doit 1113 1
Started by Deleted User
Dear Forum,
I would like to derive some image stats and am having trouble with the 'envi_stats_doit' function.
here is the command line input that I have been using.
input_file = 'path to my floating point image'
envi_open_file, input_file, r_fid=input_fid
envi_file_query, input_fid, dims=dims, ns=ns, nl=nl, fname=fname, data_type=data_type
envi_doit, 'envi_stats_doit', fid=input_fid, dims=dims, comp_flag=1, dmin=dmin, dmax=dmax, $ mean=mean, stdv=stdv
print, 'Minimum ', dmin
p...
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1 |
1113 |
02 Jun 2007 08:47 AM |
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1 Replies and 1054 Views
cw_pdmenu event function not found 1054 1
Started by Deleted User
Hello
I have a strange problem, when I supply a name of the function
to the cw_pdmenu in the form flag\value\func_name,
the func_name is not found when I know it exists and
can be called directly.
what could be a problem
Thanks
LF
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1054 |
01 Jun 2007 10:59 PM |
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1 Replies and 1337 Views
starting IDL in auto/graphical mode and compression/decompression of jp2 images 1337 1
Started by Deleted User
I am new to IDL and ENVI. I obtained an evaluation license and the IDL 6.3 from ITTVIS...for Windows. I installed it in 32 bit and the operating system is XP Professional. May I request you all to advise me how to run the IDL in auto/graphical mode and also how to compress/decompress jp2 images.
Desu Subrahmanyam
India.
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1 |
1337 |
31 May 2007 10:26 AM |
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1 Replies and 1133 Views
concerning modal dialogues 1133 1
Started by Deleted User
Hi everyone,
I am working on a GUI right now whose purpose is to capture images from a detector. One of the things that this program does is run through a timed sequence (for example, a reset, then a user-specified integration time, then a read, etc). To keep the program functional during these timed sequences, I avoided using IDL's 'wait' commands and instead implemented widget timing, where you specify how long you want IDL to wait before calling a certain function or procedure. This allows...
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1 |
1133 |
30 May 2007 10:56 AM |
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1 Replies and 1482 Views
Is there any efficient way to downsampling? 1482 1
Started by Deleted User
Hi,
I want to know is there any efficienty way to do downsampling in IDL.
Our mayjor use is in xy-phase plot of particles in plasmas.
In the previous work, I just plot each particle as a .ps file. It makes the .ps file too large (about 600 MB).
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1 |
1482 |
29 May 2007 06:26 PM |
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1 Replies and 2746 Views
Making .sav files useful with other languages 2746 1
Started by Deleted User
Hello,
I have two structures saved in an IDL .sav file. Do you guys know how I can import this data to MATLAB. When I try, it says that .sav file is a proprietary format. I have a few IDL procedures that play with the data, and I'd like to port them to MATLAB. If it's not possible, can you suggest how I should go about saving these structures to a format that MATLAB would be able to read (preferably I would like the form of the structures preserved so that I won't have to think up new ...
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1 |
2746 |
25 May 2007 12:43 PM |
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1 Replies and 1340 Views
New to IDL 1340 1
Started by Deleted User
I am new to IDL , i wanted to learn IDL and develop tool which help me to calculate the mean and variance and also convert radiance to reflectancee.
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1 |
1340 |
24 May 2007 02:52 PM |
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0 Replies and 1657 Views
IDL 6.4 is available 1657 0
Started by Deleted User
IDL 6.4 is now available for download. For more information about the
new features, visit http://www.ittvis.com/idl/whatsnew.asp.
Bill Okubo
IDL Product Manager
ITT Visual Information Solutions
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1657 |
24 May 2007 01:32 PM |
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1 Replies and 1191 Views
read/write text files?? 1191 1
Started by Deleted User
Hi,
This is fairly an easy problem that I unfortunately do not know the
answer to. I find myself with the same problem several times, and don't know
of an elegant way of addressing it:
I have a bunch of images. 6 sets of 10 repeated images. I need to
calculate the mean and variance of 1 pixel in each set and plot them.
I know how to read each pixel and obtain mean and variance. The
question I have is handling all these files as they are separate. I
have right now, calculated my mean ...
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1 |
1191 |
22 May 2007 07:12 PM |
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1 Replies and 1216 Views
Question on MODIS albedo processing with IDL-'Spawn' statement 1216 1
Started by Deleted User
Hi, everyone! I am back to ask a question on albedo processing with IDL.
I am dealing with MODIS43 for processing albedo. As most of you may know, however, MODIS43 only provides black sky albedo (BSA) and white sky albedo (WSA). We need to calculate actual albedo based on these values.
Recently I downloaded the look up table (sky_lut.dat) and several source codes from ...
http://www-modis.bu.edu/brdf/userguide/tools.html
However, these files are written in C. Because I am not famili...
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1216 |
16 May 2007 11:34 PM |
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1 Replies and 1182 Views
XINTERANIMATE from netCDF 1182 1
Started by Deleted User
I would like to know how to read data from netCDF and animate the resuls using XINTERANIMATE. The data is for surface water ponding depths.
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1 |
1182 |
15 May 2007 11:14 AM |
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1 Replies and 1059 Views
To extract a region from a fits image 1059 1
Started by Deleted User
Hi, everyone!
Does somebody know a tool to extract a region from a 'fits' image In addition, the region cut has to 152 degrees tranversal.
Thanks
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1 |
1059 |
14 May 2007 11:26 AM |
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1 Replies and 1172 Views
problem: versionmajor 1172 1
Started by Deleted User
the error is :
Conflicting or duplicate structure tag definition: VERSIONMAJOR.
who can show me the reason
thank you very much
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1172 |
12 May 2007 04:17 PM |
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3 Replies and 1472 Views
IDL6.2 on Mac os X 10.4.9 1472 3
Started by Deleted User
Hi.
I have installed IDL6.2 on my MacBook (intel, tiger 10.4.9).
There is an warning as :
IDL> x=findgen(101)*(0.01*2.0*!pi)
IDL> y=sin(x)
IDL> plot,x,y
X windows protocol error: BadRequest (invalid request code or no such
operation).
I don't know how to do with this problem.
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3 |
1472 |
10 May 2007 01:42 AM |
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2 Replies and 1508 Views
Java Class.forName() Problem 1508 2
Started by Deleted User
Hi
I'm experimenting with the IDL-Java bridge but I'm having problems with Class.forName() - it throws a ClassNotFoundException always.
In the default IDL configuration I can run the urlread.pro example no problem, so the JVM Classpath seems OK. However, if I then construct a java.lang.Class object and invoke:
jClass->forName, 'URLReader'
it fails with a ClassNotFoundException.
Any ideas please
James
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1508 |
09 May 2007 03:09 PM |
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3 Replies and 1366 Views
Add a 1:1 diagonal line in a plot in IDL...? 1366 3
Started by Deleted User
Goodday, Everyone.
I am writing a classical scientific paper comparing MODIS-retrieved data with ground measured data. I found several papers on this. Almost all of those papers have figures with 1:1 diagonal lines, and I want to draw this with IDL.
First, I tried this with a simple data file. First column is ground- measured air temperature, second column is MODIS-retrieved/processed air temperature.
dat.txt
-4.2 -1.4
0 2.7
2.8 6.9
5.3 4.1
3.8 ...
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1366 |
08 May 2007 11:41 PM |