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0 Replies and 1442 Views
Error in Internal Tables for Radiance Calibration of MSS images? 1442 0
Started by Deleted User
Greetings!
I believe this has something to do with the internal tables that are used for radiance conversion both in ENVI and IDL so I am posting this question to both fora:
I converted DN values of a Landsat 1 image (dated 1973-2-27) to radiance values. I used MSS_CALDOIT routine for this. I realized that, in converting the Band 4 DN values, IDL used 127 as QCALMAX rather than 63 as suggested by the EOSAT bulletin (August 1986). Is this an erroneous operation on the part of IDL (ENVI too...
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1442 |
20 Dec 2007 02:32 PM |
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0 Replies and 1360 Views
Aster DEM shift 1360 0
Started by Deleted User
Hy,
the dem file generated from a Aster georeferenced image, show a 300m about shift mainly in E--W direction.
Why
antonio zeoli
musoe nazionale antartide siena
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1360 |
20 Dec 2007 03:54 AM |
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0 Replies and 1418 Views
estimatiing net radiation using Landsat 7 1418 0
Started by Deleted User
Hi all,
I'm new to ENVI programming, but, not new programming in general. I'm trying to estimate
net radiation using Landsat 7 data, and I'm programming this in ENVI/IDL. I have found several ENVI routines that will help me out with this task. However, I think there is still much more that
I need to do.
I was wondering if anyone already had a program to estimate net radiation, or could tell me
if there was an easy way to program this issue.
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0 |
1418 |
18 Dec 2007 01:07 PM |
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1 Replies and 8987 Views
Calculating the Azimuth angle and the Zenith angle 8987 1
Started by Deleted User
Hello,
I’m trying to use Flaash to correct my image and I’m not sure about how to calculate the Azimuth angle and the Zenith angle that Flaash needs as input in the advanced settings. I know that the solar zenith is (90 – elevation angle) but the zenith angle that Flaash needs should be different because the help said that it should be between 90 and 180. I would be very grateful should somebody help me.
The information of my image is the following:
Product Image ID: 000
Sensor: IKONOS-2
...
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1 |
8987 |
17 Dec 2007 01:44 PM |
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1 Replies and 1576 Views
envi_stats_doit w/ mask 1576 1
Started by Deleted User
I have a multiband image file and a mask file for the multiband image. I am trying to use the mask with envi_stats_doit function (with m_id and m_pos)to get the basics (min, max, mean, std). I use the following command:
envi_doit, 'envi_stats_doit', comp_flag=1, fid=fid, dmin = min, $
dmax = max, std = stddev, mean = mean, dims=dims, pos=pos, $
m_id = m_id, m_pos=mpos
I get stats out, but the mask was not applied - my min values are 0 with above command. The 0s should be mas...
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1 |
1576 |
13 Dec 2007 12:35 PM |
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0 Replies and 1190 Views
blobs ROI 1190 0
Started by Deleted User
Hi,
There is an way of to get the blobs(islands) of a ROI (roi of same color) separately in a program.
thanks.
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0 |
1190 |
13 Dec 2007 11:01 AM |
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0 Replies and 1074 Views
Basic Classification Questions 1074 0
Started by Deleted User
Hello. I have two questions regarding a maximum likelihood supervised classification of an Landsat 5 island scene I'm performing. I'm still learning my way around ENVI, so these are basic questions.
1. In performing the classification, how do I 'deaden' or exclude a cloud area so that it is not involved in the classification algorithm, i.e. affects the rest of the image As it stands now, I have create a separate ROI for the clouds.
2. I just returned from this island and ground truth...
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1074 |
12 Dec 2007 09:34 PM |
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1 Replies and 1590 Views
Band names import ASCII 1590 1
Started by Deleted User
What is the format for import an ASCII to rename bands from header info
Edit attributes
band names
Import ASCII
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1 |
1590 |
12 Dec 2007 10:22 AM |
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0 |
1312 |
11 Dec 2007 10:35 AM |
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0 Replies and 1038 Views
photo rectification in batch mode? 1038 0
Started by Deleted User
part two of an earier question:
Are there ENVI batch mode versions of the 'build RPC' and 'orthorectify using generic RPC' tools
It would be very handy to generate some IDL/ENVI code to at least partially automate the rectification of many images...
Thanks!
Adam
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0 |
1038 |
05 Dec 2007 09:37 AM |
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1 Replies and 1346 Views
The Neural Net classifier 1346 1
Started by Deleted User
Hi, i want to do a neural net classifier, but i have a error 'Operands of matrix multiply have incompatible dimensions:,.'
I select the RIOs and push Classification->Supervised->Neural Net and don't touch anything.
I do something wrong
Where I can found a tutorial of this method
Somebody can helpme
Thanks
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1 |
1346 |
04 Dec 2007 10:38 AM |
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1 Replies and 1399 Views
aerial photo rectification without ground control 1399 1
Started by Deleted User
Hi all
I'll preface this with saying that I'm relatively new to ENVI, so I'm probably missing something quite simple. If so, great! And here's my problem:
I would like to rectify some aerial photographs, taken from a helicopter &91hence some pitch and roll is usually present&93. I have all the parameters needed for building an external orientation, since I know the latitude, longitude, altitude, pitch, roll and heading of the camera - everything required for omega/phi/kappa correction.
...
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1 |
1399 |
27 Nov 2007 06:57 PM |
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2 Replies and 1580 Views
missing RPC coefficients with ASTER 1580 2
Started by Deleted User
Hi, all!
A problem again!
I must do an orthorectification and an atmospheric correction (with FLAASH) on my ASTER L1B images.
First I use FLAASH. To do this I have to use 'layer stacking' previously. But then when it comes to orthorectify my image, the RPC coefficients had disappeared (visibly because of the layer stacking operation).
Moreover, it seems impossible to orthorectify before FLAASH (see my previous post).
Please help me if you can.
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2 |
1580 |
27 Nov 2007 12:15 PM |
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1 Replies and 1508 Views
Error building RPCs for orthorectification of Level 2 ASTER products 1508 1
Started by Deleted User
When using the ENVI plugin 'build_ast_l2_rpcs.sav' I get an error that says: 'Variable is undefined: INCREMENTS' when I try to build the RPCs for various AST_04 Brightness Temperature images from 2000 to 2007. Is there any way to correct for this problem
Thanks,
Anna
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1 |
1508 |
26 Nov 2007 07:20 PM |
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0 Replies and 1286 Views
Avoid interpolation 1286 0
Started by Deleted User
Hi all,
I have a very simple question about an ENVI procedure. Does anyone know how to avoid the interpolation where the data are missing with the ENVI_GRID_DOIT procedure
ENVI_DOIT, 'ENVI_GRID_DOIT', X_PTS = XYZ&910,*&93, Y_PTS=XYZ&911,*&93,
Z_PTS=Result&910,*&93, OUT_DT=5, PIXEL_SIZE=pixel_size , $
OUT_NAME='Skewness', O_PROJ=defProj, INTERP=0, R_FID=r_fid
Thanks in advance.
Antoine C.
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1286 |
26 Nov 2007 01:44 PM |
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1 Replies and 1218 Views
failure to install license 1218 1
Started by Deleted User
Hi,
I had acquired a HASP dongle licence and had successfully installed it on a 32-bit winxp system. Recently, I wanted to migrate to another platform, 64- bit windows 2003. However, after installation, IDL was unable to find the specified HASP and entered into the seven-minute demo mode. Despite many tries, the same problem remain unsolved.
Any advice as to what could have gone wrong
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1 |
1218 |
25 Nov 2007 11:07 AM |
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2 Replies and 1356 Views
Error using FLAASH with ASTER image 1356 2
Started by Deleted User
Hi everybody,
I get this message error while using the FLAASH atmospheric correction with ASTER images:
ACC error:
IDL error: -551
OPENR: Error opening file. Unit: 100
File: C:\RSI\IDL63\products\envi43\filt_func\aster.sli.hdr
in context: avrd: No nonblank pixels found
calls:
ACC_AVRD ACC_HYPER2 ACC_ACC ENVI_ACC_EVENT ENVI_FLAASH_PROCESS_MANAGER $MAIN$
System error string:
Le fichier spécifié est introuvable.
(In english: specified file not found)
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2 |
1356 |
22 Nov 2007 06:46 AM |
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1 Replies and 1496 Views
Writing to HDF-EOS files in ENVI4.3 1496 1
Started by Deleted User
Hi,
I have been trying to modify a geofield in a MODIS HDF-EOS file with the following code:
(infile is a string with the location of the .hdf)
nswath = eos_sw_inqswath(infile, swath_list)
swath_name = strsplit(swath_list, ',', /extract)
fid = eos_sw_open(infile, /rdwr)
swath_id = eos_sw_attach(fid, swath_name&910&93)
geofield_count = eos_sw_inqgeofields(swath_id, geofield_list, geofield_ranks, geofield_types)
geofield_names = strsplit(geofield_list,...
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1 |
1496 |
20 Nov 2007 05:36 PM |
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1 Replies and 1244 Views
HSI Mosaic with null values 1244 1
Started by Deleted User
Hello
I created a mosaic of hyperspectral data from multiple flightlines and set the background value to zero for each individual line. Now when I open the virtual mosaic, only a few portions of the mosaic actually have spectra - all others have a value of zero. I think what I am asking is how do I include only valid information into the mosaic, while leaving out NaN values
Thanks
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1 |
1244 |
16 Nov 2007 02:11 PM |
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2 Replies and 1365 Views
On creating plots 1365 2
Started by Deleted User
Greetings and Happy Friday! I am trying to plot some spectral curves. My question: In ENVI 4.3, how do you keep the spectral profile that you plotted from changing in the event that you want to collect another profile from another part of the image, i.e. change the spatial location in the zoom window I have already tried un-checking the collect spectra option. I would appreciate assistance and look forward to hearing from someone. In the meantime, all the best!
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2 |
1365 |
16 Nov 2007 02:05 PM |