Questions tagged [ndvi]

Normalized Difference Vegetation Index is used to quickly identify vegetation and its condition in remotely-sensed data.

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6
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1answer
861 views

Viewing bands of landsat 8 images in QGIS for NDVI calculation?

I am trying to calculate NDVI values for sites I sampled with landsat 8 imagery. The equation is simple : NDVI = (NIR band - Red band)/(NIR band + Red Band) Now I understand that landsat 8 images ...
0
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1answer
294 views

Using scale and offset values of MODIS products

I'm working on NDVI data from MODIS_13Q1 product. As far as I know, NDVI data has scale and offset values. I used these values to get geophysical values of pixels. My problem is after processing ...
4
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1answer
322 views

Different values for NDVI from different techniques

I'm trying to calculate NDVI from Landsat 5 imagery. I'm using ArcMap 10.2.2. I know that the formula for NDVI is (VIS-INFRA)/(VIS+INFRA), where in Landsat 5 VIS= band 3 and INFRA= band 4. When I ...
2
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1answer
158 views

Georeferencing image for EarthExplorer?

I am quite new to QGIS and I am trying to do something which seems so simple but it won't work. I have looked for an answer and couldn't find any. So I dowloaded data imagery from EarthExplorer about ...
3
votes
1answer
808 views

NDVI image processing

I am trying to get a NDVI image from an RGB + NIR image captured by a modified Cannon S110 camera bought from Event38 along with a 3DR Iris+ drone link The image captured with the camera looks like ...
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3answers
3k views

Convert NDVI raster data to shapefile

I apologize in advance for my lack of knowledge. I don't know a great deal about working with this program, so I'm learning as I go. I am wanting to take the free Landsat data that I have downloaded ...
-1
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1answer
85 views

Creating composite band

I have land cover rasta data for the years 2000, 2010 and 2014. I would like to get the NDVI for each of the year. I have to generate the RGB first. I have tried the following things: 1. layer -> ...
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0answers
39 views

Error when using Raster Calculator in ArcGIS to compute NDVI, Process output is binary, limited to pixels that are either 0 or -1 [duplicate]

I am using WorldView-3 satellite images that have been orthorectified and corrected to sensor reflectance values to compute a set of normalized difference indexes, including NDVI in ArcGIS version 10....
0
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1answer
83 views

Mapping (Reverb) MODIS NDVI Data in Counties Polygons Shapefiles

I am quite new to GIS and I have downloaded header files from the reverb website. My main goal is to get the average NDVI based on a counties polygon shapefile.
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0answers
139 views

How to display data within a drawn polygon

I am using mapbox as my base layer and would like to implement a functionality as shown in this gif below, where if i draw a polygon , it reads from my geotiff file and display NDVI data. I would like ...
2
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0answers
73 views

Overlaying point data with NDVI layer with raster output (not graph)

I have point data, which are animal burrows, and a NDVI raster layer that shows plant productivity. I want to overlay these layers and determine if vegetation productivity is higher close to burrows (...
1
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1answer
730 views

multiply range of value NDVI of Modis product in Google Earth Engine

Modis product have range of value NDVI from -2000 to 10000, but I need this range of value modify on range from -0,2 to 1 This is my code for finding NDVI in region: var California = ee.Feature( //...
-2
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1answer
1k views

Calculation of average NDVI of area in QGIS?

I wish to calculate the average NDVI value of an area (polygon). Thus the average value of all pixel. How can this be done in QGIS?
3
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1answer
775 views

Performing per-pixel linear regression over multiple rasters with NoData?

I have a stack of 10 Landsat satellite images over the same area that I have calculated NDVI for. I want to calculate NDVI trend over time on a per-pixel basis. This means that for each pixel in the ...
3
votes
1answer
515 views

Better NDVI for Landsat 8?

I'm looking at NDVI changes for an area over 20 years. There seems to be a slight downward trend, however, upon switching from Landsat 5 in 2011 to Landsat 8 in 2013 I'm getting NDVI values that are ...
0
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3answers
224 views

Determining vegetation health on temporal scale using mean NDVI?

I’m calculating NDVI for Bryce Canyon National Park over many years. I want to find if the vegetation in this area is becoming less healthy due to drought and heat stress over the years. When I ...
1
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1answer
216 views

Can you apply Maximum Likelihood classification to NDVI? [closed]

Can the ML be applied to an NDWI image? Or is it a separate means of classifying that is only applied on 2 or more bands? The problem I am actually facing is that without knowing that this could be a ...
0
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1answer
153 views

Incorrect values of NDSI index after TOA correction

I would like to calculate NDSI index (Normalized-Difference Snow Index) which basically is the same as NDVI but presents snow not vegetation :). As in NDVI the range of values for NDSI should be <-...
1
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1answer
297 views

Calculating plant proportion Landsat

I have this paper. In equation 2 they are calculating surface emissivity. I want to ask what is 𝑷v plant proportion? https://www.researchgate.net/file.PostFileLoader.html?id=...
6
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1answer
3k views

Calculating Landsat 7 NDVI images using QGIS

I have Landsat 7 images from 2011 to 2016 for my agricultural studies. First I corrected the slc-off problem of band 3 and band 4. Then I calculated the NDVI using both the raster calculator and the ...
4
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1answer
1k views

landsat NDVI time series plot in R, based on point or pixel

I am using R language and I would like to create a NDVI time series plot, NDVI vs time, based on irregular intervaled landsat images. I have found a method to create a raster stack and plot the ...
2
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1answer
259 views

Why do UAV-derived NDVI values fall far outside -1 to 1 range after empirical line calibration?

This question was marked as being a duplicate of Landsat8 NDVI values not in the -1 to 1 range but I've posted my question because: I am not using Landsat; and there was no explanation of how to ...
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0answers
381 views

Unable to retrieve NDVI coloured images to local storage using Google Earth Engine API

I am currently developing an application which requires LANDSAT NDVI coloured images to be retrieved to local storage. to carry out the task i wrote a script in python using earth engine API (source ...
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1answer
352 views

Getting Landsat NDVI data processed with LEDAPS on USGS earthexplorer

I am trying to download NDVI values from Landsat on the earthexplorer. I read there were higher-quality NDVI series processed with the so-called LEDAPS algorithm. The page from the LEDAPS website ...
0
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1answer
148 views

NDVI for orthoimagery in ArcGIS 10.3

I am working on orthoimagery which I got from drone (UAV). I am wondering if it is possible to create NDVI map from it. I was following the steps as described in this tutorial: NDVI in ArcGIS I ...
4
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2answers
302 views

How to reduce number of raster bands of a RGB picture?

For my Master Thesis in Ecology I want to calculate an NDVI Index. The tricky part is, that I don't have sattelite pictures with bands and so on, but RGB pictures. The pictures where taken with a ...
4
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1answer
2k views

Finding correlation between two rasters in ArcGIS for Desktop?

I am working with a NDVI image and a an interpolated yield map in ArcGIS 10.3.1. They are both projected in the same coordinate system and the cell sizes are equal. I interpolated the yield harvester ...
4
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2answers
2k views

Raster calculator error: Invalid Layer: GDAL provider Cannot open GDAL dataset

I'm attempting to create an NDVI raster using a multiband image from a Parrot Sequoia. It's got only 4 bands instead of 5 so I'm using the following setup for creating the NDVI .tiff: However, I get ...
3
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1answer
1k views

Pixel-wize trend analysis of an irregular time series stack of NDVI rasters in R

I'm interested in doing a pixel-wize trend analysis of a series of NDVI images from Landsat in R. The problem is that my images are not exactly happening at regular intervals. But decent imagery of ...
1
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2answers
156 views

NDVI values obtained with different sensors

In a research paper with NDVI values, differences were found for the same pixel between Landsat 5, Landsat 8, MODIS or Sentinel made after the corresponding atmospheric corrections. Can this be right? ...
2
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0answers
227 views

Supervised Classification Plugin QGIS: change input image; use another raster layer

I'm doing supervised classification on a sugar cane field for identifying vegetation, soil, and soil and litter. The plugin is only taking in the GeoTiff taken from the multispectral camera we used (...
0
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1answer
430 views

How to calculate Percentages of NDVI Classes

I Have calculated the NDVI Using Landsat. I Classify it by threshold value of 0.25 I Then made 5 classes. Now i want to calculate the percentages of each class individually. please reckon me process.
0
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1answer
393 views

What are the spectral indices that use addition of Landsat 8 bands for finding vegetation?

NDVI is found out using the division of subtraction and addition of bands. Is there a simpler index for finding out vegetation(or other physical characteristic)? For example, DVI=NearInfraRed-Red is a ...
1
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2answers
596 views

Using ArcGIS Raster Calculator to calculate MSAVI2 based on Landsat 8 OLI bands 4 and 5

I would like to calculate a Modified Soil-Adjusted Vegetation Index 2 on the basis of Landsat 8 OLI imagery, bands 5 (NIR) and 4 (RED), using the Raster Calculator. The formula should be: I have ...
8
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2answers
1k views

Why is there a difference between NDVI using Sentinel 2, in ArcMap & QGIS?

I have been trying to calculate the NDVI for a scene using Sentinel 2 bands 4(red) & 8(NIR). I first did it in ArcMap and then QGIS. In both softwares, I used the raster calculator and included ...
3
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1answer
2k views

Extracting LANDSAT time-series data by polygon using Google Earth Engine?

importing the landsat 5 TM 32-day NDVI composite data set. I have made it as far as drawing a polygon of my ROI and extracting from a different data set, a global land cover map (ESA/...
2
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0answers
508 views

Pixel based Regression

I have 80 .tif files, and each pixel value represents NDVI. The whole stack of images is a time-series. I want to run a regression for each pixel using NDVI and time. I have tried to approach this ...
0
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1answer
694 views

How to compare EVI values with NDVI values?

I have been doing NDVI (Landsat 4-5) analysis for my research area for some time now. I recently decided to try out EVI (MODIS). But the EVI values I get are a bit different from NDVI. For example ...
1
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1answer
514 views

How to remove cloudy pixel from MODIS NDVI (MOD13Q1)

I am using MODIS NDVI product (MOD13Q1) for the vegetation changes study. I want to remove cloudy or bad pixel from MODIS NDVI data. I am not getting any suitable method or software or any program to ...
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0answers
45 views

ArcMap MODIS NDVI for district in India? [closed]

I am working on 159 HDF files for the India subcontinent. I am trying to get min, max, standard deviation from the different districts of India using shapefiles. How do I make all the HDF files to ...
0
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1answer
633 views

Obtaining something like NDVI value from Sentinel-1 product

Is there a way to get the some data about biomass from sentinel-1 product? Then try to convert it to NDVI value. Maybe have some way to get RGB value?
3
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2answers
1k views

NDVI analysis of LANDSAT 8 imagery in QGIS

I am trying to run an NDVI classification of 2015 multispectral LT8 imagery in QGIS to assess the quality of vegetation cover in regards to habitat suitability for a primate species in northern ...
1
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2answers
884 views

How to define season by month and average data

I have 10 year NDVI data i.e. two values per month. I would like to average values within a season e.g Season A (January, February and March) per year and plot a graph. y axis=average ndvi value, x ...
2
votes
1answer
542 views

Splitting multiband raster into multiple bands using ArcGIS ModelBuilder? [duplicate]

I'm using the ModelBuilder functionality in ArcGIS, and would like to take a raster that contains 4 bands, clip it with a polygon and then make NDVI from the clipped file. To do that, I need access to ...
3
votes
1answer
159 views

How to represent seasonal variability in a single global NDVI map?

I have twelve monthly MODIS datasets for a 1 year period (http://neo.sci.gsfc.nasa.gov/view.php?datasetId=MOD13A2_M_NDVI&year=2015) and wish to combine all the data into a single map highlighting ...
1
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1answer
234 views

Pixel based 10 year NDVI time series

I would to do pixel based 10 year NDVI time series analysis using MODIS data. I’ve 3 seasons in a year. Should I average all values in the study area per season?
1
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0answers
62 views

Find densest point in satellite agriculture map [closed]

I have a .tiff image file with 3 bands. I want to write a program, (python opencv?), that will find the first N densest points in the region. Densest, meaning the point with the most of its own ...
0
votes
1answer
721 views

NDVI anomaly calculation in ArcMap 10.2

I am trying to calculate NDVI anomalies for three years satellite images in ArcMap 10.2. I am doing it by using formula: [{(NDVImax_2000) - (mean_NDVImax)} / (mean_NDVImax + NDVImax_2000)] * 100 I ...
1
vote
1answer
312 views

time-series analysis

I have 46 MODIS NBAR images of the same area (time-series). How can I get seven (1 for each band) multilayer (46 layer) images, for the further FastICA analysis? According to the results of the paper, ...
2
votes
1answer
137 views

Is there a standard color palettes for the spectral indices?

Is there a standard color palette (or most commonly used in publications and other materials) for the spectral indices?