A remote sensing and image analysis software package produced by Exelis Visual Information Solutions (Exelis VIS).
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28 views
ENVI Header (.hdr) Wavelength Units and NDV?
Two ENVI Header (.hdr) questions, so I wrapped them together:
Any resource for information on what valid parameters for 'wavelength unit' are? I see a reference to the parameter and the need for a ...
4
votes
2answers
138 views
How to remove vehicles from an aerial photograph
I have an aerial photograph of an area. The image includes visible traffic signs and vehicles. How can I remove the vehicles from the image? Is it possible to do so in software like Erdas or Envi ...
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0answers
33 views
How to perform Neural Network Classification?
I'm using ENVI 4.8.There are some problems on parameters for Neural Network in Envi.(Envi-Classification-Supervised-Neural net)
There are 5 bands and 12 classes that i have used for my study .
The ...
3
votes
1answer
198 views
How to read/write ENVI metadata using GDAL?
I am trying to use GDAL to read and write images in ENVI format (for example a .bsq file with an associated .hdr file). The GDAL Formats Info page states "Starting with GDAL 1.10, all ENVI header ...
1
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2answers
49 views
ENVI to map composition
I'd like to print out 6 images in a single page. How can I do this using map composition tools in ENVI (6 images are year-to-year dynamic images with the same size and the same geo-referencing)?
...
1
vote
1answer
56 views
How to recode bands in which max value occur?
I have 2 raster images; ras1 (an image with max value) and ras2 (an image with 5 bands). Basically. ras1 image extracted from ras2 images. I'd like to find bands from ras2 in which max value occur and ...
2
votes
1answer
128 views
MOD 35 Cloud Mask HDF in ENVI
I am having difficulty getting ERDAS or ENVI to correctly read and display cloud mask attributes from MOD 35 HDF files. They files are displayed as 0-255, whereas I expected some kind of code 0, 1, ...
3
votes
2answers
100 views
ENVI BIL file algorithm logic
I have a 6 band Landsat image, RGB and 3 NIF bands. As far as the Band Interleaved by Line (BIL) method goes, the resulting image should have, and I quote ENVI manual:
the first line of the first ...
6
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1answer
190 views
How to remove clouds in High resolution Imagery(.5 mGeoeye)
i have imagery with high resolution .5m, large parts covered with clouds,so it's obscure many urban areas.
thank you.
2
votes
2answers
736 views
How to repair topology of a shapefile?
I performed an object-based image analysis using ENVI EX, and each of the classified features were exported as a shapefile. I transferred those shapefiles into ArcMap 10, and tried to intersect them ...
1
vote
1answer
392 views
ENVI Vegetation Index Calculator
I am attempting to input 4-band CIR imagery into ENVI's Vegetation Index Calculator and keep running into the same error: "Wavelengths must be defined to calculate vegetation indices".
I have ...
1
vote
1answer
137 views
How to remove pixel values below -1?
I have downloaded NDVI from MODIS website and pixel values go up to -3000 to 1. I want to remove all values below -1. How do I do this?
I am using ENVI 4.3
2
votes
1answer
92 views
Error while trying to upload a .bsq file to the geoserver
I am trying to upload a .bsq file (ENVIHdr Coverage Format) to the geoserver. While doing this I got an error message. I am using the "GDAL" Extension for the geoserver. The error message is: "Could ...
6
votes
0answers
76 views
Phenological event extraction in IDL
I’m doing phenological study using threshold method in IDL. I have a twelve-band image in 2005 (format is in .tiff not ENVI format). Twelve-band means that monthly images (Jan to Dec) have been ...
3
votes
3answers
713 views
Manually edit a raster to improve a classification?
I have a land cover classification derived from Landsat TM imagery - I created this classification using ENVI. I would like to edit individual and groups of cells in some areas of the classification ...
2
votes
2answers
378 views
Reading MODIS L1B into ENVI
I am working with MODIS Terra (and simultaneous ASTER) Level 1B swath data using ENVI and am having one of these "this should be easy" questions about the most direct way to get to geo-referenced ...
1
vote
2answers
204 views
How to import a multiband image into IDL?
I want to run mathematical calculation on monthly NDVI images from april to october. I stacked monthly NDVI images through april to october into an image (with 7 band) using ENVI. Now I wanna import ...
19
votes
5answers
1k views
OpenSource Remote Sensing Tools for Classifying Roofs
with envi image processing and classification tools, you can get roofs from images with some spectral value and then you can convert it some vector data for your app.
in python with OpenCV which have ...
0
votes
1answer
204 views
How to change the image size (column and row number) into the same size
I’m using IDL program. But I have a question how to convert different row and column number (row/col) to the same size of column and row number of 36 time series NDVI images. These images grouped into ...
3
votes
3answers
653 views
Problem with NDVI image value
I'm really happy to find this website. It is very helpful for the learners of Arcgis.
Now I wanna ask a question. When i open NDVI image in ENVI, its value is still within the range (-1 to 1). But ...
2
votes
5answers
846 views
Is there any batch process to get a single band image from stacked image
Can you help me to extract a single band image from stacked multiband image. Totally, 260 image has been stacked. When I do to this, it will take a long time. So I'd like to know there is any batch ...
3
votes
2answers
1k views
How to create an animation from raster data?
I have some NDVI and precipitation/temperature images at the monthly time step from Jan, 2005 to Dec, 2008. I need to create animation image to show the temporal change. How can I do this. Is it ...
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1answer
626 views
Image classification [closed]
How can I do classification based on NDVI image. What kind of process and model can do it?
Thanks a lot
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4answers
342 views
Extraction of monthly image from two-16 day images
I need to conbine two-16 day NDVI image into monthly NDVI image. To do this, what kind of function and formula are used in ENVI, ARCGIS or ERDAS?
Best regards,
5
votes
3answers
887 views
resize image resolution from 1000 m to 250 m
I'm beginner of ARCGIS and RS. I have many problems with the procedure. One of them is
I have NDVI images and Soil map. Both are at the different resolution: NDVI is 250 m. soil map is 1000 m. So I ...
5
votes
3answers
505 views
ENVI EX reviews?
Does anyone have a review of ENVI EX? I am wondering how well the Feature Extraction and Image Classification workflows function.
