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2 Replies and 2878 Views
Spectral Math 2878 2
Started by Deleted User
Hello,
Is spectral math possible in IDL If so, how I need to divide hyperspectral images by a white reference.
Thanks!
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2 |
2878 |
10 Feb 2017 10:47 AM |
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2 Replies and 2610 Views
Metadata update 2610 2
Started by Deleted User
Is it possible to update metadata of a raster file without exporting
I would like to change band names and save the raster without creating new file by ENVIRaster::Export.
After using the ENVIRasterMetadata::UpdateItem I cannot just save the raster with ENVIRaster::Save
It says: Raster is open for read. Please use Export Raster to save.
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2 |
2610 |
08 Feb 2017 02:59 AM |
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2 Replies and 2995 Views
Patterns and EPS output 2995 2
Started by Deleted User
Hello everyone,
I can't get IDL (8.5.1) to output any figure containing patterns correctly.
To illustrate my problem, we can use the code from the polygon manual page :
IDL Polygon
data = RANDOMU(s,51)*15-5
upper = data RANDOMU(s,51)*2 6
bottom = data - RANDOMU(s,51)*3 - 7
year = INDGEN(51) 1950
p = PLOT(year, data, XRANGE=&911950,2000&93, YRANGE=&91-15,20&93, $
YTITLE='Soil Heat Accumulation &91MJ m$^{-2}$&93', THICK=2)
poly = POLYGON(&91year,reverse(year)&93, &91upper,reve...
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2 |
2995 |
07 Feb 2017 08:19 AM |
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1 Replies and 2899 Views
Layer stacking from metadata 2899 1
Started by Deleted User
Hi everyone, I want to layer stack from the metadata file, is it possible I already read the metadata using this code:
pro landsat8
e = ENVI()
; Open a Landsat-8 file
file = 'F:\Citra\LANDSAT\\20140127\LC81190652014027LGN00\LC81190652014027LGN00_MTL.txt'
raster = e.OpenRaster(file)
; Landsat-8 images are stored in a five-element array.
; Multispectral bands from the OLI sensor are stored in
; the first array element. You do not need to perform this
; step with most mult...
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1 |
2899 |
06 Feb 2017 08:47 PM |
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2 Replies and 2683 Views
ENVIGainOffsetRaster 2683 2
Started by Deleted User
Dear Sir or Mam
I am using envi api programming with envi 5.3 and idl 8.5. But ENVIGainOffsetRaster doesn't work in my envi/idl programming. in other wods whenever I open it's result in my software, it's information about gain and offsets are empty. could you help me please
sincerely,
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2 |
2683 |
03 Feb 2017 10:28 AM |
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1 Replies and 2592 Views
LEGEND function 2592 1
Started by Deleted User
I'm using IDL 8.5.1.
I'm using the PLOT function, and making several curves in it (that is, invoking PLOT several times, using CURRENT to point to the original, and /OVER). In creating the legend, I'd like some parts of the legend to respect the Tex-Like typesetting that is now available in IDLs TEXT objects.
However, when I use the TARGET keyword to LEGEND, and appropriate mathematical construct in the NAME property of the plots, they are not typeset at all, just printed directly.
I can get ...
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1 |
2592 |
27 Jan 2017 07:47 AM |
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1 Replies and 2766 Views
Problem with idlpy executing a simple ENVI task 2766 1
Started by Deleted User
Hi all,
i have an working IDL code to elaborate the TOA reflectance reading the metadata file MTL.txt. The asset is Landsat 8.
Now, i am trying to execute the same code from python, using idlpy and IDL.run('expression') sintax.
Here my code:
from idlpy import IDL i also tryed from idlpy import *
passing parameters to IDL function
IDL.root_path = root_path the directory where the MTL.txt file is saved
IDL.TOA_Dir = TOA_Dir the directory where will be saved the toa_files
IDL.subdir = ...
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1 |
2766 |
24 Jan 2017 11:04 AM |
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1 Replies and 2815 Views
masking pixels in multiple bands that match range of values 2815 1
Started by Deleted User
I have a Landsat image with six bands stack stored into a single file (an array of three dimensions).
I want to create a mask for those pixels if all bands match a value “zero”.
I know how to do this in ENVI. MaskingàBuild maskà Options àImport Data Range then
determine data range (min and max values) and select “Mask pixel if all bands match range”.
Now can you tell me how I can translate this task in IDL
I have an array of (ns, nb, nb=6).
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1 |
2815 |
23 Jan 2017 08:55 AM |
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1 Replies and 2734 Views
JSON_SERIALIZE precision 2734 1
Started by Deleted User
JSON_SERIALIZE(x) will produce radically different output depending on the value of x.
For example:
IDL> a = 19.05
IDL> print, JSON_SERIALIZE(a)
19.04999923706055
IDL> a = 19.75
IDL> print, JSON_SERIALIZE(a)
19.75
Can anyone explain this enormous difference.
System settings Bug Not acceptable -- producing huge JSON file output when I am supplying 2-decimal place precision input.
C. Wallace
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1 |
2734 |
22 Jan 2017 09:26 AM |
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0 Replies and 2240 Views
detection of an abrupt change point(s) in a signal series 2240 0
Started by Deleted User
Hello, IDL colleagues:
I need to detect an abrupt change(s) in a signal series. The concept is similar to: "https://www.r-bloggers.com/a-simple-intro-to-bayesian-change-point-analysis/" or "https://de.mathworks.com/help/signal/ref/findchangepts.html". I cannot find any applicable IDL functions for my purpose. Does anyone have some comments or suggestions to me. Thanks a lot in advance.
Best regards,
Chia-Hsiang Yang
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0 |
2240 |
20 Jan 2017 12:02 PM |
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0 Replies and 2261 Views
How execute idl .pro filefrom another .pro file 2261 0
Started by Deleted User
Hello,
I need to execute a .pro file from inside another .pro file.
And one more question: can i execute every idl command line instruction (idl, ENVI api, envi classic api) using the idlpy module using the IDL.run('instruction') sintax
Thank you for any feedback.
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0 |
2261 |
12 Jan 2017 09:58 AM |
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2 Replies and 2065 Views
How delete a specific record from an ESRI Shapefile in IDL 2065 2
Started by Deleted User
Hello,
i need to delete a specific feature from a shapefile using IDL but i do not find any usefull tool or function. That is my simplified code:
myshape = OBJ_NEW('IDLffShape', file);
Get the number of entities so we can parse through them
myshape->GetProperty, N_ENTITIES=num_ent;
Parsing through the entities
FOR x=0, (num_ent-1) DO begin ;
Get the Attributes for entity x
attr = myshape->GetAttributes(x)
IF attr.ATTRIBUTE_0 EQ 'Roi_Test_v2 &91RECORD=2&93' THEN BEG...
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2 |
2065 |
12 Jan 2017 08:52 AM |
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0 Replies and 2278 Views
OpenRaster Error 2278 0
Started by Deleted User
Hi All,
I'm getting a silly error when I try to inital a raster result after running a task. I'm currently using ENVI 5.3 IDL 8.5.
Below is my code. The error happens after the first file in filelist, its the second one in the batch that hangs up on e.openraster().
The error is: Attempt to call undefined method: 'IDL_LONG::OPENRASTER'. Very weird and a bit frustrating because it runs beauifully on the first image but bombs on the scecond, I have 50 imgs to batch through this pro.
pro sieveC...
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0 |
2278 |
11 Jan 2017 03:18 PM |
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1 Replies and 2592 Views
"Dummies" guide to IDL 2592 1
Started by Deleted User
My grandchildren want to use a couple of my IDL licenses, and for the sake of harmony I do not want to be their initial tutor. ;-)
Is their anything resembling an IDL Dummies guide available please
Thanks,
Ian
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1 |
2592 |
09 Jan 2017 11:18 AM |
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1 Replies and 2387 Views
license error 2387 1
Started by Deleted User
I just reposted IDL 8.5 on my MAC Pro workstation running OS X El Capitan and I have received my new license.dat file but am unable to get the license activated. When I double click on the LicenseWizard an xQuartz windows opens but closely immediately and when i try to use the command line prompts i get the following errors.
bash-3.2$ cd /Applications/exelis/idl85/bin
bash-3.2$ . ./idl_setup.bash
bash-3.2$ sudo ./lmgrd_install
Password:
bash-3.2$ sudo ./exelislicense
IDL Version 8.5,...
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1 |
2387 |
04 Jan 2017 02:42 PM |
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1 Replies and 2385 Views
ENVI_DEFINE_MENU_BUTTON 2385 1
Started by Deleted User
Hello,
I try to add a button to the ENVI classic menu system from a defined procedure. I put the procedure files within the save_add directory but that didn't work, I can't have the defined button on the ENVI menu. I have ENVI 5.3 version.
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1 |
2385 |
28 Dec 2016 03:48 PM |
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1 Replies and 2067 Views
Getting Lat/Lon from object based map function 2067 1
Started by Deleted User
In direct graphics I could use the CONVERT_COORD function to return the lat/lon, in degrees, of a pixel after I had set a map projection in MAP_SET.
The new object-oriented MAP function shows provides a ConverCoord method but what it returns is a mystery. For example if I set a map with:
m = map('Mercator', limit=&9159, -170, 74, -135&93, dimensions = &91640, 640&93)
and then query the coordinates near the center I get
print, m.convertcoord(320,320,/device,/to_data) ...
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1 |
2067 |
27 Dec 2016 03:35 PM |
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1 Replies and 2074 Views
3D mesh visualizations new graphics 2074 1
Started by Deleted User
Hi!
Currently I'm using old routines like SCALE3 & POLYSHADE to visualize a 3D surface mesh in IDL. Is there a way to do this using the new graphics methods If not, wouldn't that be a nice feature for an upcoming release
Thanks!
Wouter
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1 |
2074 |
21 Dec 2016 05:50 AM |
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1 Replies and 2083 Views
Keyword syntax for ENVI_FX_RULEBASED_DOIT 2083 1
Started by Deleted User
We are using ENVI_FX_RULEBASED_DOIT to classify large TIF files into preselected classes. We need to speed up the processing time by not exporting the vector attributes. What is the syntax for suppressing EXPORT_VECTOR_ATTRIBUTES When we don't include that Keyword the vector attributes are exported anyway.
Thank you!
envi_doit, 'envi_fx_rulebased_doit', $
fid=fid, pos=pos, dims=dims, $
r_fid=r_fid, merge_level=80.0, $
scale_level=10.0, $
rule_filename=ru...
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1 |
2083 |
20 Dec 2016 09:45 AM |
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1 Replies and 2447 Views
Floating illegal operand With BuildMosaicRaster 2447 1
Started by Deleted User
Hello,
I am building a mosaic for half a dozen hyperspectral rasters using the BuildMosaicRaster task. As this process executes I get the following warning:
Program caused arithmetic error: Floating illegal operand
Upon completion, the mosaic is missing an entire raster. I am guessing this error is related to a mathematical operation that is producing a number outside the acceptable range for a floating point - perhaps division by something very close to zero Is that correct If so, how...
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1 |
2447 |
19 Dec 2016 08:45 AM |