|
|
|
|
|
|
3 Replies and 1215 Views
ERS2 interferogram generation: ERS2 orbital = failure 1215 3
Started by Deleted User
I'm having a problem when I try and create an interferogram (with DEM) using ERS2 and the precise orbits. Suprisingly, I can create an interferogram with the 2 generated SLC's when i don't use the precise orbital data during the focusing process. However, when I use precise orbital data it will focus the data without problem but when I try and form an interferogram it fails during the co-registration process and I get this error in the log (last few lines):
Amplitude cross corr: NOT ENOUGHT ...
|
|
|
|
3 |
1215 |
23 Sep 2012 08:54 AM |
|
2 Replies and 1132 Views
Is this the right forum for questions about SARscape? 1132 2
Started by Deleted User
I've posted a few questions regarding SARscape in the last couple of weeks and have received no response. In hindsight, these questions were quite basic. so I don't believe that it was due to the question posed. This leads me to believe that perhaps this forum is not for SARscape.
Is this in fact correct If this is the case, please let me know if there is a forum dedicated to SARScape. Thanks!
|
|
|
|
2 |
1132 |
20 Sep 2012 02:07 PM |
|
1 Replies and 1399 Views
processing SAR data for sea ice 1399 1
Started by Deleted User
I have several questions:
1. Is it reasonable to think that I can process some ERS-1 data to detect leads in sea ice without the SARScape module I don't need any capacity for interferometry or polarization analysis.
2. I am having some trouble calibrating the ERS data to sigma nought. In order to calculate the backscatter coefficients, I need a DEM. But, I am interested in looking at the sea. should I just create a DEM full of zeros I don't really want to do any terrain correction sinc...
|
|
|
|
1 |
1399 |
19 Sep 2012 02:16 PM |
|
3 Replies and 1090 Views
Saving classified satellite images as grids for ArcGIS 1090 3
Started by Deleted User
Hello,
i have tried all options in ENVI to save my classified satellite images as grids. I have used: 1) overlay grid lines and save and 2) Main menu-File-Save as- ArcGIS geodatabase....but the problem is, that i have to be able to open then in ArcGIS the ATTRIBUTE TABLES from the grids, but it was still without success. Is there any appropriate way to saving classified satellite images (raster datasets, i think they are diskret) as GRID to work then with the VATs (value attribute table) Thank...
|
|
|
|
3 |
1090 |
17 Sep 2012 03:28 AM |
|
1 Replies and 1387 Views
Biomass Estimation 1387 1
Started by Deleted User
Hi,
I would appreciate if anybody share me the steps to estimate above ground biomass. I have landsat MS image.
Regards,
Partha Ghosh
|
|
|
|
1 |
1387 |
11 Sep 2012 04:51 AM |
|
1 Replies and 1273 Views
ENVI 5 Spectral Profile 1273 1
Started by Deleted User
I'm playing around a bit with ENVI 5.
The previous ENVI had a spectral profile that allowed one set an averaging window. Is that possible in ENVI 5
|
|
|
|
1 |
1273 |
07 Sep 2012 11:22 AM |
|
1 Replies and 1238 Views
Map Layout in ENVI 5 1238 1
Started by Deleted User
I am not getting below mentioned option on the new GUI of ENVI 5.
1. How to create map layout (with border, grid, north arrow scale etc.)
2. How to perform attribute query
Let me know If there is any way to resolve the issues without ENVI Classic and ArcGIS
|
|
|
|
1 |
1238 |
06 Sep 2012 09:51 AM |
|
1 Replies and 1259 Views
completely black intensity/power output in SARscape 1259 1
Started by Deleted User
Not sure what's causing this but after multilooking the data I get completely black (i.e. no features) when I load the output into the available bands list. I've processed 3 different Envisat ASAR image mode data and they all create completely black screens after multilooking. I get no errors after multilooking the data and the process appears to complete with no problems.
Any ideas
|
|
|
|
1 |
1259 |
05 Sep 2012 01:08 AM |
|
1 Replies and 1141 Views
Heads up re Landsat files 1141 1
Started by Deleted User
I discovered today that thanks to the USGS metadata format update on August 29, the new Landsat metadata files (*MTL.TXT) are not readable by ENVI via the "open Landsat GeoTIFF with Metadata" function. They do, however, include the old format MTL files as "*MTLold.txt", which are readable by ENVI. They've also modified the actual filenames to match the subdirectory names in which the data are distributed. Yes, this means you may have to update your code if it involves openi...
|
|
|
|
1 |
1141 |
04 Sep 2012 01:28 PM |
|
5 Replies and 1564 Views
Separability indices ENVI 5? 1564 5
Started by Deleted User
Greetings
I am new to ENVI 5 and have searched the documentation tirelessly. I cannot locate any separability index calculators (m-statistic, transformed divergence etc) for classified images. This was easy to do in ENVI 4.8, I assume it still is.
Can someone point me in the right direction
Best
Dan
|
|
|
|
5 |
1564 |
02 Sep 2012 11:58 AM |
|
1 Replies and 1450 Views
Assigning bands in Band math expression 1450 1
Started by Deleted User
I am processing multiple Landsat data for my research. I would like to perform dark object subtraction on each image then calculate NDVI from the output. Does anyone know if there is a way of grabbing the bands from the dark object subtract result and use them in the Band math expression I have already done the dark object subtract part but I need to continue with the NDVI calculation.
M
|
|
|
|
1 |
1450 |
02 Sep 2012 08:30 AM |
|
2 Replies and 1196 Views
Clouds and atmospheric correction 1196 2
Started by Deleted User
Hi there,
I have a few Landsat images (ETM and TM) which I want to use for landcover classifications. At the moment, I am trying to atmospherically correct them using the FLAASH module, but I have a few questions about the process.
Firstly, a couple of my images have some thick white clouds (not a lot, and not in my area of interest) - will these affect the outcome of the atmospheric correction, and should I try to mask them or remove them prior to carrying out the atmospheric correction in F...
|
|
|
|
2 |
1196 |
29 Aug 2012 08:54 AM |
|
3 Replies and 1320 Views
FLAASH adjacency effect 1320 3
Started by Deleted User
Hi! Anyone could tell me which is the extension of adjacency effect considered in FLAASH module Is a fixed value or is a function of spatial resolution of sensor
Thank you in advance!
Laura
|
|
|
|
3 |
1320 |
24 Aug 2012 08:21 AM |
|
1 Replies and 1189 Views
TRANSFORM MODIS EMISSIVITY IN KELVIN 1189 1
Started by Deleted User
Hello,
How i can transform emissivity values fom MOD11A2 (band 31 and 32) in Kelvin i already try the operation (b1*0.02) which is recommended in many papers to get the data value in Kelvin, but my values are two low to bel K, so can someone tell me the right procedure to get the temperature in K units
Best regards
Maria
|
|
|
|
1 |
1189 |
24 Aug 2012 07:16 AM |
|
1 Replies and 2824 Views
How to extract the pixel values in a certain shapefile by ENVI? 2824 1
Started by Deleted User
I have produced a coherence map (INSAR), and imported it into ENVI with geographical info.Every pixel of coherence map has its own DN value as coherence.
Then, I loaded another Landsat TM image into ENVI with the vectors (evf)as masks to distinguish different kinds of land types and uses(like vegetable ,urban and water).
Now I need to extract the values in each vector(shape),(like I have to gather all the coherence of water ) and export them out as an array in the format like txt or xls fo...
|
|
|
|
1 |
2824 |
22 Aug 2012 02:42 AM |
|
2 Replies and 1339 Views
Is the elevation of the relative DEM relative to the ellipsoid? 1339 2
Started by Deleted User
Hi,
I used the DEM Extraction Modules to extract a DEM from the ASTER L1A data without GCPs, that is a relative DEM.
Is the elevation of the DEM relative to the WGS-84 ellipsoid And if so, how could I convert the elevation to the height relative to EGM96 geoid
Thank you very much.
Yuzhe
|
|
|
|
2 |
1339 |
21 Aug 2012 03:10 AM |
|
4 Replies and 1029 Views
Image Processing in IDL 1029 4
Started by Deleted User
Hi,
Is it possible to execute all the image processing functionalities of ENVI in IDL For example if I want image atmospheric correction using FLAASH algorithm in IDL ...... is it possible or I wanto to run Spectral Angel Mapper algorithm in IDL .... is it possible.
Any help will be highly appreciated.
Regards,
Partha Ghosh
|
|
|
|
4 |
1029 |
20 Aug 2012 05:37 AM |
|
2 Replies and 1277 Views
Mosaic images using the max value between images 1277 2
Started by Deleted User
Hello-
I was wondering if there is a way to mosaic overlapping images that have a range of negative values that need to ignored in order for the mosaic to work correctly. For example, some of my images have more than one negative value. I would like to set the mosaic to just choose the maximum value of overlapping images, but I haven't seen this as an option.
Thank you
-al
|
|
|
|
2 |
1277 |
15 Aug 2012 09:48 AM |
|
6 Replies and 1446 Views
Combining multitemporal classified scenes using band math 1446 6
Started by Deleted User
Dear Forum,
my question, very important for my thesis, is:
what is the right operation to tip in band math tool, if i want to combine 4 RapidEye classified scenes as multitemporal scenes from different dates ( the rule images of them) in one envi classification file
Thanks a,lot!!
|
|
|
|
6 |
1446 |
15 Aug 2012 02:14 AM |
|
1 Replies and 2140 Views
How to define projection for an image with arbitrary projection (pixel-based) 2140 1
Started by Deleted User
Hello,
I am trying to define a projection for an image that has an arbitrary projection (pixel based). I have read from some forums that arbitrary projection means that it doesn't have any projection at all.
I have tried "Convert Map Projection" but it doesnt work as it dont have an initial projection to convert it from. I have also read that layerstaking will not work. I still tried to put on top of the list the projection I want to copy in layer stacking, and yes it didn't work.
...
|
|
|
|
1 |
2140 |
13 Aug 2012 09:21 AM |