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0 Replies and 1720 Views creating a mean image  1720  0 Started by  Deleted User I'm looking for a simple way to average multiple images that have different missing data in each image. I've tried SUM DATA BANDS, as well as Band Math, but i still run into the same problem. With SUM DATA BANDS, i can't exclude missing data. With Band Math i was able to add all the data i wanted but then i couldn't average it correctly. Missing data has a value of either 254 or 255, so i wrote: (B1 LT 250) *B1 (B2 LT 250) *B2...... for 8 bands. However, when i divide the whole thing by 8 at t...
0 1720
18 Jan 2006 09:51 PM
0 Replies and 1699 Views creating a mean image  1699  0 Started by  Deleted User I'm looking for a simple way to average multiple images that have different missing data in each image. I've tried SUM DATA BANDS, as well as Band Math, but i still run into the same problem. With SUM DATA BANDS, i can't exclude missing data. With Band Math i was able to add all the data i wanted but then i couldn't average it correctly. Missing data has a value of either 254 or 255, so i wrote: (B1 LT 250) *B1 (B2 LT 250) *B2...... for 8 bands. However, when i divide the whole thing by 8 at t...
0 1699
18 Jan 2006 09:51 PM
0 Replies and 1499 Views sbc payments  1499  0 Started by  Deleted User greetings, could we please redeem our points for an Olive Garden gift card, Thank you Norma Brown
0 1499
18 Jan 2006 07:35 PM
0 Replies and 1626 Views Topographic Features question  1626  0 Started by  Deleted User Hi there -- I'm trying to use topography feature extraction to get a map of local 3 x 3 image maximum (e.g. 'peaks') -- I'm noticing that 'close' values (even with the slope tolerance set to 90 and curvature to 0.000) sometimes result in adjacent pixels being classified as peaks -- since a peak is, by definition, a pixel with all neighbors lower than it, and there are NOT equal values in these adjacent 'peaks', I'm a bit stumped as to what might be going on. On a related note, what, exactly,...
0 1626
18 Jan 2006 02:35 PM
0 Replies and 1659 Views Images co-Registration problem  1659  0 Started by  Deleted User Happy New Year! I have tried to co-registered the images, however, the 'map info' of those co-registered images were gone after I re-opened them again in the 'avaliable band list' Therefore, I have to do all the analysis at once before I shut the software. However, even I coregistered the images, I cannot link them together. I am 100 sure that both images cover the same area and with same coordiante system. However, the system pops up an error ' There is no common data with which to l...
0 1659
14 Jan 2006 01:21 PM
0 Replies and 1568 Views Landsat 5 calibration Post May 5, 2003  1568  0 Started by  Deleted User Can anyone tell me if ENVI 4.1 incorporates the change in Landsat 5 offsets and biases in their automated radiance and reflectance calibration tool for post- May 5, 2003 images Does the tool use a lookup table or read information directly from the image header Thanks in advance. Inga
0 1568
03 Jan 2006 10:08 AM
0 Replies and 1636 Views sauvgarde d'images en TIFF sans dégrader l'ecriture des toponymes (envi 3.4)  1636  0 Started by  Deleted User bonjour, est-ce qu'il est possible d'enregistrer une image avec des toponymes et avec son habillage quickmap en les gardant tels qu'il sont, car à chaque sauvegarde en TIFF, la qualité de l'habillage et des toponymes se dégrade, lorsque en insere l'image dans un document ou lors de l'impression
0 1636
03 Jan 2006 07:04 AM
0 Replies and 1644 Views post-classification operation  1644  0 Started by  Deleted User Hello all, I need to implement some post-classification operation over an image that covered by vector GIS layer of land-use polygons. In new classification image each polygon should belong to the class of biggest pixel group within given polygon. Anybody have an idea where I should start Thank you in advance Michael
0 1644
02 Jan 2006 01:51 AM
0 Replies and 1649 Views Calibrating Landsat ETM for surface temperature extraction: some questions  1649  0 Started by  Deleted User Hi Folks, Merry Chistmas. I have been using the Landsat ETM calibration tool in ENVI for the primary purpose of extracting surface temperature from the thermal band 6. The result has returned unusally low surface temp values. So: does the spectral radiance need to be processed further to get correct values I have been calibrating just the thermal band, is this legitimate Is it better to process the high gain (band 62) or the low gain (band 61) data Some help with this and maybe some ap...
0 1649
27 Dec 2005 11:52 PM
1 Replies and 1492 Views make the image more clearly  1492  1 Started by  Deleted User I want to find the number of the car in the picture. Of course I want the help from you! Maybe you can help me find the method to deal with it, or you can help me contact with the specialists in the field. Thousands of thanks. the picture is: http://gucd.bokee.com/inc/20051206_151549_080P.jpg
1 1492
22 Dec 2005 02:06 AM
0 Replies and 1467 Views SIR-C ceos data format  1467  0 Started by  Deleted User Dear ALL, I would like to read my SIR-C data which are in ceos format. I got the data on disk and not on tape. Does anyone known how I can read them ENVI offers an option but it only to read ceos fromat from tape. Regards, Charles
0 1467
19 Dec 2005 02:27 PM
0 Replies and 1632 Views toggle linked display with 1 button mouse  1632  0 Started by  Deleted User Running ENVI on MacOSX: Should I be able to cycle through linked displays with a 1-button mouse I can't discover how to emulate 'MB1 MB2', the combination needed to toggle through linked displays. MB2 is itself emulated by pressing Option key with a mouse click (ie with MB1). Pressing Option or Command keys while clicking the mouse emulates 2nd or 3rd mouse buttons just fine - but how is the simultaneous clicking of two buttons emulated
0 1632
18 Dec 2005 02:40 PM
0 Replies and 1524 Views Segmentation / Unmosaik  1524  0 Started by  Deleted User Hi all, someone knows any way to segment an image as unmosaiking For example if you have as image and you want tu cut it on 4 sub-images with a overlapping area ... but not doing manually. I think that the solution is program it, anyone have another idea thanks José Manuel Lattus
0 1524
18 Dec 2005 06:45 AM
0 Replies and 1651 Views Segmentation / Unmosaik  1651  0 Started by  Deleted User Hi all, someone knows any way to segment an image as unmosaiking For example if you have as image and you want tu cut it on 4 sub-images with a overlapping area ... but not doing manually. I think that the solution is program it, anyone have another idea thanks José Manuel Lattus
0 1651
18 Dec 2005 06:45 AM
0 Replies and 2051 Views Modis mod13q1 NDVI processing  2051  0 Started by  Deleted User Hi folks, I'm pretty new to ENVI and was wondering if I could have some help in processing Modis NDVI products in preperatin for MM5 modelling. Have got them reporjected etc. but data values are very high for NDVI. Read some where I need to divide values by 10 000, how do i go about this for the whole band Thanks Graeme
0 2051
15 Dec 2005 02:30 AM
2 Replies and 1610 Views ASTER Radiance on ENVI 4.2?  1610  2 Started by  Deleted User Good morning I'm searching for the command 'ASTER radiance' on the new release of ENVI 4.2 but I don't find it. In prevoius versions (4.0) this command was present in preprocessing > calibration > ASTER menu. Have you some supplemental info's Thank you Enrico
2 1610
14 Dec 2005 08:48 AM
0 Replies and 1791 Views help on Image/spectral math  1791  0 Started by  Deleted User I want to do a simple ratio of image(*, cols, rows) over spectral (*) using ENVI. I have a IDL code as below, but it does not work through band math function. Any help will be appreciated it. function atmc, b1, s1 ; do the ratio of image to atmos correction spectra imgdim=size(b1,/dimensions) cols=imgdim&911&93 rows=imgdim&912&93 for i = 0, rows -1 do begin for m = 0, cols - 1 do begin result = b1(*, m, i) / s1(*) endfor endfor return, result end
0 1791
12 Dec 2005 06:17 PM
0 Replies and 1980 Views Geological Data Extraction using ENVI  1980  0 Started by  Deleted User Dear ENVI users, Do any one of you know how to use ENVI for geological data extraction. Are there some special function in ENVI to extract geological data from Landsat ETM data. Do any one know about special IDL scripts or ENVI built-in function or module that help us to extract geological data from Landsat ETM data.. Thanks ALI
0 1980
10 Dec 2005 02:40 AM
0 Replies and 1556 Views truly bonehead question - extracting raster values at point locations  1556  0 Started by  Deleted User OK, now I feel like a bonehead and a severe newbie to ENVI... I need to extract the value of a raster band at 7000ish points that I have in a shapefile. How Thanks!
0 1556
08 Dec 2005 09:50 PM
0 Replies and 1709 Views help - classification error on mosaicked data  1709  0 Started by  Deleted User hello, i need some urgent help here, the problem i'm having is that after i've mosaicked my data strips using the 'feathering' method, and run classification on the whole mosaicked data, I got an error message - some sort of 'array error' - the classification was halted at 90. but, if i mosaicked without using feathering, i can run the whole mosaicked data without this error. But i need to use data with mosaicked (feathering) due to better image quality. anyone had encountered simil...
0 1709
08 Dec 2005 08:37 PM
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