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1 Replies and 1413 Views Lat/Lon coordinates of each country of a worldmap  1413  1 Started by  Deleted User Hi, guys, I have a txt file with concentration data at each Lat-Lon on 1 deg resolution for world map. i know i can create a Geo Lat/Lon world map at 1 deg X 1 deg resolution but then how can i compare these 2 file to calculate the total concentration of each region like asia or countries like china, usa etc.. or if i could assign all the Lat/Lon according to countries or regions. could someone give me suggestions on how to proceed.
1 1413
25 Apr 2008 11:00 AM
1 Replies and 1874 Views RMSE  1874  1 Started by  Deleted User What units is the RMSE reported in when doing image-to-image registration in ENVI Pixels or meters Thanks!
1 1874
24 Apr 2008 03:48 PM
1 Replies and 1338 Views ENVI forest health tool  1338  1 Started by  Deleted User I am looking for some technical information about the ENVI forest health tool .how does it calculate different health classes Thanks Anu
1 1338
22 Apr 2008 01:16 PM
1 Replies and 1351 Views script to export image as individual bands?  1351  1 Started by  Deleted User Hello, I need to export multiple bands from an envi image as individual .bil or .asc files to use in a predictive modeling program (Maxent). Can ENVI export a multi-band file to multiple single band files, or has anyone written a script written that can do this -John
1 1351
22 Apr 2008 12:00 PM
1 Replies and 1383 Views GAINOFF_DOIT  1383  1 Started by  Deleted User when I use GAINOFF_DOIT routine as follow: ENVI_DOIT, 'GAINOFF_DOIT',dims=dims,fid=openfid,gain=reflectance_scales, offset=reflectance_offsets,out_name='I:\EXAMPLE\Image\out_ref',pos=0,r_fid=reffid reflectance_scales and reflectance_offsets are float arrays. The datatype of inputfile is Unsighted Int. why the datatype of the result image is Unsighted Int If I hope the datatype is float, What should I do
1 1383
21 Apr 2008 07:41 AM
1 Replies and 1220 Views The coordinate is not accurate!  1220  1 Started by  Deleted User Hello , I want to do georeference to MODIS data, but a headache bother me. First ,open the data, there are two ways to open MODIS 1B data(HDF) in ENVI software: 1. File -> open image file 2. File -> open external -> EOS -> MODIS I both have a try to do . Second step , I choose the menu of 'map' ,then click on ' georeference MODIS'. I have choosen the 'Geographic Lat/Lon' projection with bow-tie correction,then it did procession. but the coordinate of t...
1 1220
19 Apr 2008 11:58 PM
1 Replies and 996 Views Update views (ENVI)  996  1 Started by  Deleted User How can i, update the views (IMAGE ,SCROLL and ZOOM ) in my program after alter the data into file of an image (without close the views) rodrigo.
1 996
16 Apr 2008 04:33 PM
0 Replies and 1244 Views ArcGIS shape file and Envi  1244  0 Started by  Deleted User I have put random points on an image (.img format) and made a shape file. I want to extract pixel values of those random points. How is it possible please explain step by step. thanks
0 1244
16 Apr 2008 12:05 PM
1 Replies and 1136 Views ArcGIS shape file and Envi  1136  1 Started by  Deleted User I have put random points on an image (.img format) and made a shape file. I want to extract pixel values at those random points. How is it possible please explain step by step. thanks
1 1136
16 Apr 2008 12:05 PM
0 Replies and 1252 Views ROIs in multiple images  1252  0 Started by  Deleted User I want to create regions of interest in multiple images for subsequent classification (in all images at once using the same mean and covariance matrices) and exportation to ArcGIS. So far, I have always merged the geocoded images by creating a mosaic, but due to the size of the images this is no longer possible. I've tried all the hints I've found on the web and in the tutorials, but I can't seem to make it work. Thanks in advance, Wilfried Maps
0 1252
10 Apr 2008 11:53 AM
0 Replies and 1271 Views How to get stats from difference map  1271  0 Started by  Deleted User Hello. I ran the Compute Difference Map on a couple TM images to do a basic land cover change analysis (after atmospheric correction). I did this for the vis green, red and NIR bands. Is there a way to get any statistics behind the resulting change maps Similarly, how can I combine this image differencing method with the post-classification change analysis method to get a really intuitive analysis and possibly compare and contrast the two approaches for my dataset and study region Man...
0 1271
09 Apr 2008 08:47 PM
1 Replies and 1292 Views Problem with ENVI_SETUP_HEAD with INHERIT option  1292  1 Started by  Deleted User I have two images (TIFF)... 1) original_image 2) final_image And I want that the final_image inherits the original_image map info. But when I use the ENVI_SETUP_HEAD routine with the INHERIT option my final_image is shifted 8 pixels to the right in correspondence to the original_image. The code I am using is more or less the following... ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ; Get the size of the original image ENVI_OPEN_FILE, original_image_path, r_fid = original...
1 1292
09 Apr 2008 08:12 AM
1 Replies and 1468 Views Avoid authomatic ASTER calibration  1468  1 Started by  Deleted User Dear all I'm searching for a solution to avoid the automatic ASTER calibration (see at http://www.ittvis.com/services/techtip.aspttid=4114&pv=yes) to conserve the original 8bit unsigned pixel values. Some suggestions Thanks a lot Enrico
1 1468
09 Apr 2008 07:39 AM
1 Replies and 1272 Views Display DEM in meters  1272  1 Started by  Deleted User Hello, i've generated a DEM from the bands 3N and 3B of an ASTER image using the tool DEM Extraction Wizard. I defined myself some GCPs (X Y Z coordinates) all around the studied area. My problem is that the generated DEM is displayed in gray values and i need it in meters. Is there any way to convert it or maybe did i miss a step during processing I wish you can help me, Charles
1 1272
04 Apr 2008 09:33 AM
0 Replies and 1402 Views How to merge EVF and DBF files? Or merge IDL structure variables into one?  1402  0 Started by  Deleted User I have 4 sub-images each one with one EVF and one DBF file. The 4 images are slightly overlapped in some areas. I can merge the EVF into one but I'm having some dificulty in creating a unique DBF file. The ENVI help is no help at all... How do I do this It seems that ENVI only writes DBF files and doesn't read them... For each sub-image I also have structures variables with the DBF attributes. How do I join this structures from the several sub-images into only one final image The ...
0 1402
03 Apr 2008 06:02 AM
1 Replies and 1135 Views Landsat and Envi FLAASH  1135  1 Started by  Deleted User Dear all I want to correct a Landsat image using FLAASH. But Im not sure about what I have to do with de viewing geometry parameters. In Flaash the zenith angle and the azimuth angle can be modified, I think that Landsat use a nadir viewing geometry, so the zenith angle is 180, is it correct. Besides I have to set the zenith angle but I dont know if the angle is the sun azimuth or the sensor azimuth. In the image header appear the sun azimuth, is that the angle I have to use. Would ...
1 1135
02 Apr 2008 06:25 AM
0 Replies and 2089 Views Need for help in Support Vector Machine (SVM) Classification  2089  0 Started by  Deleted User I'm working on classifications of very high spatial resolution Quickbird (agricultural plot) and I would like to use SVM classification with the software ENVI. I encounter some difficulties and I would like to know if somebody could help me. In the literature (C-W. HSU, C-C. CHANG and C-J. LIN, A practical Guide to Support Vector Classification, 2008), the RBF kernel is first considered. A simple scaling on the data must have been previously conducted. How can we do this scaling in concrete ter...
0 2089
01 Apr 2008 03:26 AM
1 Replies and 1766 Views Covariance matrix  1766  1 Started by  Deleted User Hello forum, Generally a covariance is statistical measure of the tendency of variables to move or vary together. So I would like to ask about the meaning of values in covariance matrix that I produced for certain ROI over multispectral image.
1 1766
01 Apr 2008 03:02 AM
1 Replies and 1592 Views ENVI_get_roi_data  1592  1 Started by  Deleted User Dear all, I want obtain the image data within a region(saved as evf file ,only 1 polygon) ,such as pixel values,so I writed the program like this: ;open a file and get info label_file = envi_pickfile(title='Please select a Label file') envi_open_file,label_file, r_fid=label_fid envi_file_query, label_fid, ns=ns, nl=nl ;open evf fine evf_fname = 'a1.evf' evf_id = envi_evf_open(evf_fname) envi_evf_info, evf_id, num_recs=num_recs for i=0L, num_recs-1 do begin r...
1 1592
30 Mar 2008 01:32 PM
0 Replies and 1465 Views Raster to vector- batch processing  1465  0 Started by  Deleted User Hello, everyone I am a junior user of ENVI programming, I try to transter a raster image to a vector file. The Raster to Vector function in ENVI only can transfer specified DN value to a vector file. I want use batch processing to transfer the whole image to a vector file in which different DN values are in different layers. But I can not find a suitale ENVI routine to realize the tranformation in ENVI programming, how can I realize this Many thanks!
0 1465
27 Mar 2008 08:01 AM
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