X
Search this forum:
Search
You are not authorized to create a new topic
Page 130 of 137 << < 128129130131132 > >>
Topics
 Replies
 Views
 Last Post
2 Replies and 1898 Views Statistics and null values  1898  2 Started by  Deleted User I am using the MODIS NDVI productwhich has a data range of -2000 to 10000 with a null value of -3000. When I run statistics on the file, or a classified image based on it, I keep getting a minimum value of -3000, not the real data values. I have set the 'Data Value to Ignore' parameter in the header file to -3000. Is there any way to exclude these values when calculating statistics The statistics are bad because it is creating mean values that are too low.
2 1898
25 Oct 2005 07:44 PM
0 Replies and 2005 Views how to display wavenumber & wavelength in Z-profile window in ENVI  2005  0 Started by  Deleted User Hi, I would like to display both wavenumber and wavelength on the X axis (top and bottom) of the Z-profile window in ENVI. I can import one of them say, 'wavenumber' for the bottom part but would like to know the additional changes needed for the ENVI header file to import the wavelength to be displayed on the top part of the axis. Y axis can be imported easily. ENVI header reads like this: ENVI description = { Create New File Result &91Sat Nov 10 13:11:40 2001&...
0 2005
24 Oct 2005 10:39 AM
0 Replies and 2089 Views spectral library  2089  0 Started by  Deleted User hi to all, I am applying some mathemaical expression on a spectral library with the help of band math. when I open the spectral library it shows a single band , but it has 242 bands. now my expression in band math wants to select two bands as input variable. Is someone tell me how could this be possible.....................
0 2089
23 Oct 2005 11:52 PM
0 Replies and 1946 Views Spectral Library  1946  0 Started by  Deleted User Hello: I have a spectral library created for my in ENVI, the data is ASCII. I want converted this data in a image or pixel for used the 'spectral feature fitted'. (SFF).
0 1946
23 Oct 2005 11:52 PM
0 Replies and 1939 Views 11 bit format  1939  0 Started by  Deleted User Some of the ASTER data can be delivered in 11 bit format. When ENVI imports this kind of data, it is written to a 16bit image channel Is it possible to specify 8bit as output band type thanks
0 1939
12 Oct 2005 04:19 AM
0 Replies and 2727 Views Sun glint removal from imagery  2727  0 Started by  Deleted User Greetings, I have some hyperspectral images over a water body that are affected by sun glint. Does anyone have any code or good ideas on how to remove or decrease the effect of the glint in my images. Appreciate any comments. Thanks Dan
0 2727
11 Oct 2005 06:41 AM
0 Replies and 1849 Views stretching  1849  0 Started by  Deleted User I have some MODIS chlorophyll data that I'm trying to visualize with a log stretch. But I have some problems finding out how. Can anyone help
0 1849
10 Oct 2005 04:00 AM
0 Replies and 2040 Views could someone tell me what is in ENVI 4.2 package ,how many ,I want to order one set.  2040  0 Started by  Deleted User I want to know detail of ENVI 4.2 package node locked license .how many are there.
0 2040
07 Oct 2005 08:51 AM
0 Replies and 1692 Views Process radar image  1692  0 Started by  Deleted User Could anyone please tell me how to process the radar image (CEOS format) into intensity / backscatter image I have the following files, but i do not know how to utilize them in order to process into intensity image. dat_01.001 lea_01.001 nul_dat.001 par_dat.001 vdf_dat.001 Thank you very much
0 1692
06 Oct 2005 08:43 AM
0 Replies and 2062 Views Import ENVI raster to ArcGIS  2062  0 Started by  Deleted User I want to import a large amount of ENVI rasters to an Oracle database using ArcCatalog via a ArcSDE-server. I have downloaded the DLL (ENVI Reader for ArcGIS 1.1 (Microsoft Windows NT 4.0, 2000, XP)) and installed it. This made ArcCatalog recognize the .dat-file and I can import it to the database. The problem is that I can not build statistics on the dataset and if I try to preview the dataset it is all white. Something has gone wrong here and I don´t know what to do. Can anyone please give me ...
0 2062
04 Oct 2005 04:36 AM
0 Replies and 2112 Views PCA statistics  2112  0 Started by  Deleted User When one computes statistics for Pricipal components Analysis, the matrix that appears for the eigen vectors has for column and row headings the name Band 1 band 2 etc up to the number of bands and components. Since both rows and columns headings are 'bands', which of the two (rows or columns) are the Principal components then Is it as traditionally written the columns or has ENVI got a different arrangement I want to compute the loadings for each band and I need to know whether the rows or th...
0 2112
03 Oct 2005 12:45 PM
0 Replies and 1989 Views Calculating statistics using a shape file  1989  0 Started by  Deleted User Hi! We have a shape file with a large number of polygons, and we'd like to use this file to calculate statistics from images. The data are all georeferenced using the same projections etc. To do this, I have converted the .shp files into evf vectors, and these then into ROIs. However, while all the polygons are translated into different ROIs. However, the name of each ROI is the same (namely, the name of the .evf file), so when I calculate statistics, there is no way to know which polygon is wh...
0 1989
28 Sep 2005 09:45 AM
0 Replies and 1781 Views Coarsening Image Resolution  1781  0 Started by  Deleted User Could someone tell me how to coarsen the spatial resolution of imagery (in this case, Quickbird imagery) Any help would be greatly appreciated.
0 1781
22 Sep 2005 01:44 PM
0 Replies and 2064 Views programming envi : how to create a DBF file with a boolean attribute ?  2064  0 Started by  Deleted User Hi. I can create a dbf file with the routine envi_write_dbf_file. But it is limited to numbers and strings. I need to do something similar with a boolean attribute. Is it possible Does anabody know a way to do that Thanks. Nicolas.
0 2064
19 Sep 2005 05:53 AM
1 Replies and 1716 Views correction in LUT table  1716  1 Started by  Deleted User I have been applied a ENVI built in function HIST_EXPORT_DOIT in my application because i want to change the DN value of my data by applying some manipulation on LUT . but i m unable to do it, Is there someone who tell me how to multiply each previus DN value by a factor by using LUT (look up table)
1 1716
15 Sep 2005 07:02 AM
0 Replies and 1775 Views comment integrer un code en C dans ENVI/how can I use C programes in envi  1775  0 Started by  Deleted User svp je voudrai savoir comment compiler des codes sources ecrites en C pour les utiliser dans envi, alors que les codes qu'on peut utiliser ont une extension .pro, dans le guide que j'ai il est possible mais comment
0 1775
13 Sep 2005 12:28 PM
1 Replies and 1876 Views lineaments  1876  1 Started by  Deleted User Hello! If anybody working on lineaments analysys in ENVI 4.1 and/or IDL 6.0
1 1876
29 Aug 2005 06:47 PM
1 Replies and 2003 Views mosaicking in ENVI  2003  1 Started by  Deleted User Greetings, I am mosaicking a georeference image and have it almost complete, but I would like to fill in the gaps between two of my images. I would prefer to use the cutline feathering option, however Im a bit frustrated by the procedure. I know I need to use a polyline annotation to define the area I want to 'cut out' but how do I figure out the where that area is exactly in my image. The tutorials are not helping me either, so any advice from someone with experience would be a lifesaver! ...
1 2003
29 Aug 2005 06:32 PM
0 Replies and 1804 Views Silica mapping/Determining the Gaussian Minimum  1804  0 Started by  Deleted User Anybody read... Mapping variations in weight percent silica measured from multispectral thermal infrared imagery—Examples from the Hiller Mountains, Nevada, USA and Tres Virgenes-La Reforma, Baja California Sur, Mexico, S.J. Hook et al. / Remote Sensing of Environment 95 (2005) 273–289 ... It mentions that 'The weight percent silica value for a given pixel depends on wavelength position of the minimum of the best fit Gaussian to the emissivity spectrum.' I'd like to apply this ...
0 1804
28 Aug 2005 12:04 AM
0 Replies and 1579 Views Exportation of DEM  1579  0 Started by  Deleted User I imported a Geotiff DEM(SRTM) into ENVI and as there were some bad cells(values of 32567) I used the `Replace bad value` routine and I would now like to export the DEM from ENVI. It seems that the options are limited. What software will read an ENVI modified DEM file I tried to import the file into GlobalMapper as it does appear to accept ENVI DEM files but the software did not accept the modified DEM. It did originally accept the raw DEM geotiff with the bad values. Any suggestions wou...
0 1579
24 Aug 2005 08:23 PM
You are not authorized to create a new topic
Page 130 of 137 << < 128129130131132 > >>