|
|
|
|
|
|
8 Replies and 3785 Views
Replace negative and zero values for all bands in image 3785 8
Started by Deleted User
Hi,
I would like to replace all negative AND zero values with another value in an image with four bands. I attempted file math using the following expression: ((b1 le 0) * (-999)) ((b1 gt 0) * b1).
The above expression worked fine on replacing negative values with -999; however, in band 4 I am still seeing some zero values with multiple occurrences. These pixels should be -999 also. Obviously, I am missing or misunderstanding something about expressions and band/file math. Can anyone ...
|
|
|
|
8 |
3785 |
10 Oct 2012 03:40 PM |
|
1 Replies and 1135 Views
orthorectification Landsat 1135 1
Started by Deleted User
Dear users,
I'm making a orthorectification with ENVI 5.0, but I don't have the RCPs. I would like to know if it is possible to get the RPC of a LANDSAT image somewhere.
Thank you so much
|
|
|
|
1 |
1135 |
10 Oct 2012 09:08 AM |
|
2 Replies and 1017 Views
What height need for the RPC orthorectification process? 1017 2
Started by Deleted User
The Elev value specified in the Ground Control Points Selection dialog
for orthorectification in ENVI must be relative to the geoid height specified for the RPC orthorectification
process.
RPC orthorectification requires height above the ellipsoid.
What height we must write in the Ground Control Points Selection dialog
|
|
|
|
2 |
1017 |
10 Oct 2012 05:40 AM |
|
2 Replies and 1092 Views
to what extent does water affect co-registration? 1092 2
Started by Deleted User
I'm curious if water plays any role in the co-registration process for interferogram creation. Most of my research focuses on coastal zones undergoing subsidence in the United States (Texas, Louisiana Mississippi) and, as a result,large portions of the scene contain water.
This doesn't appear to be an issue with Envisat data but ERS2 data I'm beginning to wonder if this could be a problem. The SARscape help says that when it attempts to co-register scenes, it first creates 'mini interferogram...
|
|
|
|
2 |
1092 |
06 Oct 2012 05:22 AM |
|
1 Replies and 1291 Views
Orthorectification ASTER L1B and LANDSAT 1291 1
Started by Deleted User
My question is: How I accurately orthorectify ASTER Level 1B data and Landsat data L1G in ENVI 5.0
Thank you for your help.
|
|
|
|
1 |
1291 |
05 Oct 2012 02:02 AM |
|
1 Replies and 1043 Views
do you really need a minimum of 20 SLC's for an accurate persistant scatter in SARscape? 1043 1
Started by Deleted User
The help for persistent scatter (PS) states
"The coherence estimate can be considered "reliable", for the PS identification, using 20 input acquisitions or more "
This seems like an exceedingly high amount of inputs (in addition to the work required to focus all 20 scenes). When I use only 7 input SLC's and click the "estimate precision' it yields:
PRECISION (VELOCITY=1.37088 Height=1.5494e-014)
Given this precision estimate, wouldn't only 7 interferograms as in...
|
|
|
|
1 |
1043 |
04 Oct 2012 07:05 PM |
|
|
0 |
1078 |
04 Oct 2012 02:12 AM |
|
|
1 |
1164 |
04 Oct 2012 02:11 AM |
|
6 Replies and 1511 Views
Flaash 1511 6
Started by Deleted User
Hello, i am new ENVI user, and I am trying to use FLAASH module on RapidEye L3A image, but the results aren´t good, but I am not sure about the wavelengths and fwhm values because I haven't found the values
;
;ENVI FLAASH PARAMETERS TEMPLATE (4.7)
;Written Tue Oct 02 22:35:52 2012
;
; Project Parameters
enviacc.prj.radiance_file = C:\MONOGRAFIA C\ENVI2\62626
enviacc.prj.reflect_file = C:\MONOGRAFIA C\ENVI3\62626AC
enviacc.prj.filter_func_file = C:\Program Files\ITT\ID...
|
|
|
|
6 |
1511 |
03 Oct 2012 05:31 PM |
|
1 Replies and 1218 Views
ENVI 5.0 SP1 now available 1218 1
Started by Deleted User
In an ongoing effort to improve the usability and quality of our products we are pleased to announce the following software releases:
- E3De 3.1
- ENVI 5.0 SP1
- IDL 8.2.1
These new product versions introduce a significant amount of new functionality and improve both performance & stability. For additional information on the latest release of these software products please visit www.exelisvis.com.
Best,
Adam O'Connor
Product Management Team
Exelis
Visual Information So...
|
|
|
|
1 |
1218 |
03 Oct 2012 12:18 PM |
|
1 Replies and 1296 Views
Cutting out ROI's 1296 1
Started by Deleted User
I have an NDVI image and want to cut out a RIO's, ive tried spatial subset via ROI but that just cuts out a square region around the RIO but it like the image to be cut completely to the irregular shape of the Roi. Sure there is a simple solution iv'e missed, Thanks.
|
|
|
|
1 |
1296 |
03 Oct 2012 07:29 AM |
|
|
0 |
1088 |
03 Oct 2012 07:26 AM |
|
2 Replies and 1263 Views
Error trying to generate random sample 1263 2
Started by Deleted User
Hello All-
As the title suggests, I'm trying to generate a random sample using an ENVI classification but receive the error "Illegal subscript range GT_CLASS_NAMES" after which the process bails. The header has been modified to clean up the class names, but does not contain any special characters--the longest class name is 10 characters.
Any insight
Thanks--
|
|
|
|
2 |
1263 |
02 Oct 2012 11:22 AM |
|
2 Replies and 1551 Views
Remote Desktop and ENVI 4.8 1551 2
Started by Deleted User
I'm trying to help someone set up the ability to connect to a Windows computer over Remote Desktop. I used to be able to do it all the time while I was at Brown, with no special settings or anything needed. Now, with Win7 and ENVI 4.8, something seems to have changed. When I connect remotely, I get a "Licence not found" error, but if I sit at the actual machine we're trying to access remotely, the license works perfectly. Is there something simple that I'm missing Anyone else had...
|
|
|
|
2 |
1551 |
30 Sep 2012 02:05 PM |
|
0 Replies and 1677 Views
dqwd 1677 0
Started by Deleted User
dwada
|
|
|
|
0 |
1677 |
29 Sep 2012 09:19 AM |
|
2 Replies and 1106 Views
Problem with clouds! 1106 2
Started by Deleted User
Hi everyone, Im doing some work using landsat data in a region of the Peruvian Amazon. Being a rainforest its obviously very cloudy which makes doing landcover classifications, which is my main aims very problematic. Has anyone got some good solutions to get over the cloud problem Thanks James
|
|
|
|
2 |
1106 |
28 Sep 2012 07:56 AM |
|
1 Replies and 1173 Views
Orthorectifying DEM from DEM 1173 1
Started by Deleted User
I have two DEMs, one (DEM1) containing more details than the other (DEM2). I warped DEM1 (warp) to DEM2 (base) to make the coordinate system match (correcting in x and y direction). Now the coordinates in the two DEMs matches but the elevations divert unequally over the DEM. I want to make DEM1 to match DEM2 in the z direction (elevation). I've tried using Rigorous Orthorectification but it doesn't seems to be the solutions as interior and exterior orientation for the 'Build RPC' is unknown. Is...
|
|
|
|
1 |
1173 |
26 Sep 2012 06:40 AM |
|
1 Replies and 1396 Views
Hyperion toolkit and ENVI5.0 1396 1
Started by Deleted User
Good Morning,
I am trying to use the Hyperion toolkit, but I have problems already at the installation step.
The User Guide points out that I need to place the hyperion_tools.sav and hyperion_wl_fwhm_bbl.txt files in my ENVI save_add and/or extensions folder and that the location of this folder will vary by operating system and ENVI version.
I am using ENVI5.0 (without the "" symbol indicated in the User Guide) Standard on a Windows platform, so according to the UG I should place t...
|
|
|
|
1 |
1396 |
25 Sep 2012 04:52 AM |
|
1 Replies and 1167 Views
How to use ROI to conduct supervised classification? 1167 1
Started by Deleted User
Hello,
I want to create 100 points using ROI so I can use them to conduct a supervised classification of an IKONSO image. I know ther area very well and can distinguish between grass, woody vegetation, agriculture, road, rivers. My question is:
When I am creating the ROI, should I create one ROI/category (25 points in ROI) or should I create 25 ROI for each category
Any help is greatly appreciated!
thank you
|
|
|
|
1 |
1167 |
24 Sep 2012 03:14 PM |
|
4 Replies and 1204 Views
Building Mask from classified image 1204 4
Started by Deleted User
Hello,
i am just trying to build mask for my already classified image (by Maximum Likelihood) for 3 crop types from total:6
for the purpose to conduct new classification with Neural Net, if i take as input my maximum likelihood classified image mask.
I know, that this is possible, from another thesis. But however i have no success with this. I used ROIs for mask. Is there any good way to mask out needed crop types to let them flow in Neural Net Classifier Thank you very much
|
|
|
|
4 |
1204 |
24 Sep 2012 09:52 AM |