Questions tagged [ndvi]

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

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1answer
403 views

how to create C factor (RUSLE) map by using NDVI values?

I have a basic knowledge of GIS and arcgis sofware and I need to generate C factor (cover management factor of RUSLE) by using NDVI values. I know there is an exp formula but I dont know the steps to ...
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2answers
542 views

Calculating NDVI using Landsat 8- Cloud/Atmospheric Correction

System: Windows 7 Software: Arcmap 10.4.1 Data: Landsat 8, NDVI calculations I am attempting to calculate the NDVI values over my state over a period of 3 months. Naturally, there are going to be ...
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2answers
404 views

NDVI data for UK?

I am looking for monthly composite NDVI data for the UK between 2000 and 2013. The resolution is not so much of an issue. I am struggling to find relevant data and images for further processing in ...
2
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1answer
158 views

Make raster layer in ArcPy?

I am trying to calculate NDVI from rasters that I've downloaded with download rasters, clipping them with some features (selection_feature) that I'd split from an original archive. I am a begginer in ...
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1answer
239 views

Landsat level-2 NDVI valid range with saturation

I have Landsat level-2 NDVI tiles I am using in ArcMap 10.4.1.; however, the level-2 NDVI data in ArcMap ranges from -5,189 to +20,000. The spectral image product guide (which I've linked) says that ...
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1answer
157 views

Difference between types of Vegetation indices

I am currently comparing different types of Vegetation Indices, in this example I am using a NDVI formula and a TCARI formula. The NDVI result came out as expected with values ranging from +1 to -1. ...
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2answers
447 views

Using Landsat 5 TM 8-Day NDVI Composite?

I'm working in a project where I need the NDVI for some areas from Uruguay for the period 1988-1993, and I found this product "Landsat 5 TM 8-Day NDVI Composite" but I'm not sure of how it was ...
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1answer
2k views

Processing LANDSAT 8 data in R (using packages Raster, RSToolbox, etc.) in order to calculate NDVI and land cover classification? [closed]

I am analyzing several LANDSAT scenes from the LANDSAT 8 OLI mission (18 in total, all from Jan 2017 - cloud cover < 20%). I now want to calculate the NDVI and do some land cover classification on ...
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2answers
164 views

Is it possible to calculate NDVI using a landsat 8 .img file?

I have a mosaic image with this file extension (.img) When I use image analysis in arcmap.10.4 to calculate NDVI I get values the following values High: 3 Low : -5 NDVI values are supposed to be ...
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2answers
1k views

Calculate NDVI using ArcPy Spatial Analyst

My goal is to calculate NDVI using map algebra syntax. import arcpy from arcpy.sa import * red_band_raster = (r"C:\B3.tif") nir_band_raster = (r"C:\B4.tif") #Calculating NDVI float raster ...
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2answers
905 views

Planet NDVI calculation: ModuleNotFoundError: No module named 'rasterio'

I'm performing NDVI calculation on a Planet Scope 4 band image as per Planet's documentation The following block of code is what I wrote: Extract band data from original image in working directory ...
2
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1answer
253 views

Landsat Collection 1 Level-1 or Landsat Collection 1 Higher Level?

I want to use NDWI and NDVI index in my study for a time-series analysis using all products available (Landsat 5,7 and 8). Can I use the product Landsat Collection 1 Level 1 for my analysis or ...
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1answer
215 views

identification of Forest cover area by using eCognition Software

How to find forest cover area by using eCognition software? I'm trying to find vegetation by using NDVI in the ruleset but it takes vegetation too with the forest. Can I use any other filter along ...
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1answer
201 views

How to convert NoData values to other values for raster data?

I have a NDVI map from MODIS data for my AOI. When classified, i noticed that few of the pixels appear in " white" color and show no value. How do i classify these pixels and attache an appropriate / ...
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1answer
300 views

Why getting wrong NDVI values resulted from scaled reflectance in ArcMap?

I have made atmospheric corrections to my Landsat 8-OLI raster using 'ENVI FLAASH' having surface reflectance values scaled between 1-100. In ArcGIS I am using simple expression to compute NDVI ...
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0answers
184 views

Opening ENVI files in ArcMap?

I have calculated NDVI (vegetation index) in ENVI 5.2 and I saved it in TIFF format. Now I am trying to open it in ArcMap, but its not opening properly. The image is total black and the values are ...
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2answers
2k views

Do clouds reflect NIR/Red bands

When using Landsat 8 imagery to calculate NDVI, will the NIR and Red bands be affected by cloud cover? In other words, will clouds produce a wrong NDVI calculation?
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1answer
96 views

Cleaning up polygon generated from NDVI raster

So I have NDVI raster files for about 1000 acres of vineyards we manage. What I have done is created a model that takes the NDVi raster, reclassifies it to isolate out the areas of high vigor, then ...
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0answers
253 views

Stretching (rescaling) Raster (NDVI) Values between -1 and 1?

I am trying to equalize NDVI values for the same area temporally. For example 2014 LS8 NDVI values between -.12 and .007 while 2011 LS5 values between -.33 and.77. I would like to equalize each raster ...
2
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1answer
85 views

NDVI usage for ArcCollector and Crop Yield

So my question is as follows: I am a GIS tech for a large vineyard management company. Every year a real struggle of ours is getting a crop estimation (with +- %15 accuracy, company wants it to be +-%...
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0answers
496 views

How to export image on google earth engine for large area?

The area that i have been work have about 159695,938 km² and I am mapping the deforestion on this with NDVI. I had to use 2 years to remove all the clouds (eg. 2015-01-31 , 2016-12-31) using a reducer....
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1answer
2k views

Mask clouds in an ImageCollection google earth engine

Is It possible to create .median() Surface Refletance image (landSat 8 RS) without clouds before calculating the NDVI in goolge earth engine? I need to work with a year (eg. 2016-01-01, 2016-12-31), ...
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2answers
634 views

Calculate NDVI image from R and NIR channels and rescale it to 0-255

I have images of plants taken in Red(R) and Near End Infrared(NIR) field, I calculate the NDVI image per pixel using the below formula, NDVI = (R-NIR)/(R+NIR) , for all pixels, I get a range ...
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1answer
1k views

Mask clouds in LandSat 8 surface refletance image

I would like to know how to remove the clouds in a ImageCollection of LandSat 8 Surface Reflectance (SR) image and create a single image without clouds using google earth engine, to calculate NDVI. I ...
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1answer
394 views

calculate NDVI for several images

I want to calculate NDVI for 50 Landsat 7-TM images . I have done a stack layer for each band of 50 images using envi software and then calculate NDVI for the stack of two bands demanded in NDVI ...
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2answers
558 views

Analysing Landsat images using ERDAS IMAGINE and ArcGIS

I am trying to use the Theil-Sen analysis on the Landsat images to compute vegetation indices, help me figure out how to come up with the median from the Theil-Sen equation in ArcGIS, ERDAS IMAGINE or ...
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1answer
731 views

Image segmentation

I am performing a segmentation on an NDVI using the OTB mean shift segmentation on QGIS 2.18. The size of the image is about 15000*15000 with one band only and 8-bit. Since I do not want to use ...
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1answer
242 views

Landsat NDVI batch calculation

I want to perform a time series analysis of Landsat NDVI. I could not find a prepared product online (except in GE Engine but it is no possible to download). Thus I would like to calculate the NDVI in ...
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0answers
120 views

Creating Geotiffs MAPIR plugin? [closed]

I am trying to create Geotiffs on QGIS. I have images(RGB) from a dji phantom 4 pro and images(raw) from a MAPIR ndvi camera. However the two cameras used are not linked. I wanted to know if you ...
3
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1answer
164 views

How can we calculate the area of dense and sparse vegetation from NDVI image in QGIS?

I'm trying to obtain values of area covered by dense and sparse vegetation through NDVI classification. I'm using QGIS (2.18), ERDAS 2014 and ArcMap.
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1answer
4k views

Using a fixed palette range to plot an NDVI raster in R

I would like to plot an NDVI raster with rasterVis packages using the normalized colors from red to green. I don't understand how fix the color scale from 0 to 1 even if my raster value are between 0....
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0answers
48 views

What is the best way NDVI can be used for assessment of remediation level of ecosystem (after nuclear accident)?

I am thinking about ways to assess efficiency of various bioremediation methodologies and self-remediation of an ecosystem polluted with nuclear waste. I would like to use NDVI as an assessment ...
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1answer
79 views

Is it rational to compare vegetation indices derived from different Landsat sensors?

I am using images from two different sensors, Landsat 8 OLI (January 2017) and ETM+ (January 2007) to compute various vegetation indices. These indices involve RED and NIR band to scale vegetation ...
3
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1answer
1k views

Unable to create NDVI image using Python gdal package

I have Python 3 and all GDAL bindings installed on my Windows machine, so that when I run this: import numpy as np from sys import argv from osgeo import gdal, gdalconst I get no error messages. ...
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3answers
856 views

Processing landsat 8 to make NDVI in R

I want to do the NDVI with images landsat 8 in R, radiometric correction, radiance and reflectance, I make it from the models of the USGS (model here) But taking the image (ND) for the calculation of ...
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0answers
258 views

QgsRasterFileWriter.writeRaster() is crashing python program

I am doing ndvi analysis on a farm image. After ndvi I need to convert the image into Singleband pseudocolor image using following python code. def calculate(): file_name = CUR_DIR + "\...
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0answers
454 views

List of indices (e.g., NDVI) that can be calculated with satellite images [closed]

I'm looking for a list of published indices that can be calculated from satellite images and the corresponding formula for each: Some indicies, for example, would be: - NDVI: https://en.wikipedia....
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1answer
364 views

Calculating average NDVI for GPS coordinates using QGIS?

I have calculated the NDVI image and overlain GPS coordinates for a pack of wild animals over the top. I would like to calculate the average NDVI of all the GPS points, and then calculate the average ...
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0answers
40 views

Sudden errors intersecting NDVI raster data with overlapping polygons in GME

I am experiencing errors with Geospatial Modeling Environment (GME) that suddenly developed after things were working perfectly. Description of software installed: ArcGIS 10.3.1 for Desktop and ...
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0answers
717 views

Landsat level-2 data comparison

I'm doing a temporal analysis of NDVI and temperature over 17 years, necessitating data from Landsat 5,7, & 8. I'm interested in using level-2 Landsat data available from https://espa.cr.usgs.gov/...
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2answers
457 views

Why is a normalized parameter involving the Green band and Red band not used for Vegetation determination?

The green region reflects solar energy sufficiently well. So does the NIR region, much more than the green region, indeed. However, reflection in Green region is based on the chlorophyll concentration,...
2
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1answer
142 views

Which output data type to choose in QGIS SAGA Raster Calculator in Batch Mode?

I have 5 years of MODIS13Q1 NDVI .tiff images for time series analysis. I want to multiply all the images with the scale factor of 0.0001 before using them. In order to process all at once I try to ...
6
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1answer
853 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 ...
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1answer
288 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 ...
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1answer
318 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 ...
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1answer
154 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
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1answer
794 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 ...
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1answer
83 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....