Questions tagged [hyperspectral-sensor]
The hyperspectral-sensor tag has no usage guidance.
26
questions
8
votes
2answers
19k views
Difference between irradiance and radiance, remote sensing reflectance and water leaving radiance
I've been trying to lay my hands on textbooks, etc, that explain the differences between the remote sensing terms in lay man language.
radiance and irradiance
remote sensing reflectance and water ...
7
votes
2answers
2k views
How to get the wavelength values of bands from hyperspectral image?
I am trying to open and read a hyperspectral image using GDAL like below.
So after reading the data like this :
data = gdal.Open( filename )
then I can see the x, y, dim information of the dataset :...
3
votes
1answer
255 views
Resampling hyperspectral data to Landsat 5 TM bands
The convolution of hyperspectral data to Landsat 5 TM bands is done by using the spectral response function (SRF, or Relative Spectral Response [RSR]) of Landsat 5 TM sensor. The ranges of each valid ...
2
votes
2answers
321 views
Feature normalization (scaling) for Hyperspectral images
I have been straggling with the concept of feature normalization for the hyperspectral images. Respect to my problem I have attached a picture of my problem which clearly stands the issue which I have....
2
votes
1answer
90 views
R Code for Hyperspectral Indices
I am planning to use R to read hyperspectral images and calculate hyperspectral indices. There seems to be scripts available online, but mostly for multispectral images. For instance, this code for ...
2
votes
2answers
322 views
Making CIR imagery in QGIS
I want to compose a CIR image in QGIS. Images are part of sample dataset downloaded from Micasense website.
I built virtual raster out of Red, Green and NIR rasters but the output file color scheme ...
2
votes
2answers
47 views
High-resolution, hyperspectral satellite imaging?
I am hoping to expand my (biology-focused) research to include satellite data. For this, I'd need satellite imaging that includes multiple values in the visible spectrum (specifically, above 490nm) ...
2
votes
2answers
1k views
ENVI band math incorrect values
I'm attempting to calculate vegetation indices in ENVI 5.2 using level-2 AVIRIS data in band math.
The indices I'm working with are Vogelmann Red Edge 2, normalized difference red edge, and red edge ...
1
vote
1answer
684 views
TypeError: 'BilFile' object does not support item assignment
I want to use Python and Spectral library to open a hyperspectral image as ENVI file (.hdr + .dat), rewrite some bands and then save the file in the same format. I have problem with this:
"...
1
vote
0answers
42 views
Google Cloud Image exporting blurry and small tiff images
I'm trying to export a image from GEE. For some reason, I'm getting a very small image size that is only 21x30 in dimensions.
I'm trying to read it in Python and QGIS. Same problem in both platforms
...
1
vote
2answers
81 views
Using.divide to band math and output image is one color image using Google Earth Engine
When i used the.divide function to a previous substract of bands, my output result in the Map.addLayer is a totally full green square in the previously defined geometry.
I've used this similar code to ...
1
vote
0answers
50 views
Area under the spectral curve?
There is an existing similar question here that I have tried but didn't give me what I need.
I have an image with 20 spectral bands. How do I compute the area under the spectral curve that is ...
1
vote
0answers
96 views
6s atmospheric correction for hyper spectral data
I am trying to customize atmospheric correction for hyper-spectral data. Presently for Landsat I am using the i.atcorr GRASS GIS module. I want to know whether 6S atmospheric correction can be used ...
1
vote
0answers
102 views
When to rescale reflectance data to calculate vegetation indices
I'm attempting to calculate a number of vegetation indices using hyperspectral AVIRIS data in ENVI. Some of these indices are normalized, such as NDVI, whereas others are not, such as the Transformed ...
1
vote
0answers
48 views
white image while Trying to mosiac two hyperspectral data in ENVI
I am trying to mosaic two aviris-ng georefrenced hyoerspectral data but one of them become white in preview. so I am not able to mosaic the image.enter link description here
error ink
1
vote
0answers
436 views
Database of labeled hyperspectral imagery
Are there any datasets of hyperspectral imagery that can be used for AI training and classification, comparable to ImageNet? The Universitat de Valencia has one listed on their site, HyperLabelMe, but ...
1
vote
0answers
186 views
How to seperate class labels of hyperspectral images using R?
The image has different classes and different band, where the 220 bands are separated by the following code
library(RStoolbox)
library(raster)
library(rgdal)
library(caret)
library(...
1
vote
0answers
124 views
Software for matching spectral end members with spectral library
I am working with Moon Mineralogy mapper(M3) - hyper-spectral data and i am trying to match the endmembers obtained from M3 with RELAB spectral library. I have tried spectral analyst tool in ENVI but ...
0
votes
1answer
152 views
Using Hyperion with Google Earth Engine [closed]
I am trying to use Hyperion Data for my project, unfortunately even loading the Image Collection of Hyperion exceeds my maximum 2.5 GB Data Storage.
Hyperion has a revisitrate of 200 Days, so a one ...
0
votes
0answers
21 views
Extracting hyperspectral pixel values to shapefile?
I have developed a workflow for a question that might have an easier answer.
Say you have a hyperspectral image and a set of polygons overlapping the image. I want to extract all pixel values that ...
0
votes
0answers
11 views
Abundance maps sum to one constraint
I'm reading a paper titled "Coupled Nonnegative Matrix Factorization Unmixing for Hyperspectral and Multispectral Data Fusion" available here.
There's a line that I'm quoting from the paper here
...
0
votes
0answers
23 views
How to extract a panchromatic image from hyperspectral image
I'm new to the Remote Sensing domain and I'm working on Hyperspectral Pansharpening problem. I'm referring to the paper, "Hyperspectral Pansharpening: A review" (link). They have provided the code for ...
0
votes
0answers
30 views
FLAASH produces weird peaks
I am applying FLAASH to atmospherically correct and convert to reflectance a hyperspectral image acquired by our airborne system. The problem is that FLAASH (using ENVI) outputs an image where all ...
0
votes
0answers
19 views
Calculate mean of a column in ENVI
I have raster that looks like this:
I want to create from this raster new raster that will have only one row, when each pixel of this new row is mean value of the column.
I know how to do this in ...
0
votes
0answers
32 views
Atmospheric correction for AVIRIS hyperspectral data
I have recently started with hyperspectral image processing and analysis. I am developing a python tool for processing AVIRIS hyperspectral data.
I would like to know whether exists an open-source ...
-1
votes
1answer
32 views
R Code for Hyperspectral Band Selection Using Ensemble Method [closed]
I am looking for an existing R code that could do band selection using hyperspectral images. I have seen codes that do random forest for instance, but I hoping to use a code that does an ensemble of ...
