Questions tagged [vegetation-index]

For questions about vegetation indices, which are measures of the relative abundance of vegetation. In the context of remote sensing and GIS, vegetation indices are usually encountered as a raster dataset.

18 questions with no upvoted or accepted answers
Filter by
Sorted by
Tagged with
2
votes
0answers
110 views

How to georeference multispectral raster without loss of data

I am trying to align two rasters made of data captured during same flight, but with separate cameras (drone - onboard, and Micasense RedEdge) and two separate gps devices (drone and another one ...
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
0answers
32 views

GEMI vegetation index calculation in ENVI

I want to calculate gemi index, but I can't write its formula in ENVI, this doesn't work. gemi formula is: (n(1−0.25n)−RED−0.1251−RED) n = ( 2 * ( NIR ^2 - RED ^2) + 1.5 * NIR + 0.5 * RED ) / ( NIR ...
1
vote
0answers
405 views

Calculating Surface Roughness from Land Cover Data/Land Elevation

I'm trying to create a surface roughness file over the continental United States in NetCDF format. I've surface elevation file of 200 meters resolution and land cover data of 30meters resolution. I'm ...
1
vote
0answers
221 views

Using output of unsupervised cluster analysis to train supervised classification for vegetation mapping?

I'm using Google Earth Engine to classify mangrove forests from Landsat imagery to calculate extent. Let's say I perform an unsupervised K-means cluster analysis on a Landsat scene to identify general ...
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
88 views

Using Band Math in R Creates Raster with Different Coordinate System?

I am trying to make a simple NDVI raster from a Landsat 8 image (containing bands 2-7). The Landsat image has a Coordinate System of NAD_1983_UTM_Zone_11N (and datum: D_North_American_1983). When I ...
1
vote
0answers
100 views

Method in QGIS to classify veg from HiRes geotiffs created in Pix4D?

I have 10 2D geoTIFF orthophotos (~2GB each, ~3km2 each, all 4.2cm/pixel) that I generated from Vis RGB 12MP images in Pix4D for a desert vegetation survey over 30km2 for a development. I need to ...
1
vote
0answers
131 views

QGIS: Extract rows of grape vines from inter-row vegetation using a 3D point cloud

I have some multi spectral imagery (raster data) from a UAV of vineyards in Victoria, as well as corresponding 3D point cloud (also raster) of the vineyard topography, based off ultrasonic sensing, ...
1
vote
0answers
208 views

Why are Landsat-8 derived NDVI values higher than SAVI values?

I have calculated NDVI and SAVI vegetation indices for a landsat-8 image. I am unexpectedly getting higher values for the NDVI than SAVI. What may be causing these unusual results? NDVI=0.46 SAVI=0....
0
votes
0answers
7 views

Issues calculating VARI from Sentinel L2A

I have a dataset of Sentinel-2 L2A imagery for which I am calculating the Visual Atmospheric Resistant Index (VARI). The bands that I am using (B2 = blue B3 = green B4 = Red) I am working in ArcMap. ...
0
votes
0answers
12 views

Vegetation detection of anthropic crops with Google Earth Engine

I am very new using Google Engine and I need to know how to detect only agricultural crops on slopes without them mixing with that natural vegetation on hills. I have tried different indexes (like ...
0
votes
0answers
35 views

How to average the NDDI index for a map in GEE

In previous codes I was able to generate the NDVI average, but since NDDI is a sub-index I would like to know if anyone would be able to generate this NDDI average in GEE https://code.earthengine....
0
votes
0answers
13 views

clred- edge index for canopy chlorophyll content

I want to use clred-edge chlorophyll index to extract canopy chlorophyll content (CCC) from Sentinel-2 But based on the various articles I've read, I have two questions Is there a numerical range ...
0
votes
0answers
23 views

ArcGIS - Band Arithmetic - VARI

I have a RGB raster image for which I need to calculate vegetation indices. I have chosen to use VARI from the "Band Arithmetic" options in the "Add Function" tool in the "Image Analysis" window. ...
0
votes
0answers
69 views

Understanding why MSAVI II values are outside the theoretical range

I am trying to understand why certain vegetation indices do not fall into the -1, 1 theoretical range. I generated Modified Soil Adjusted Vegetation Index II values in Google Earth Engine using ...
0
votes
1answer
85 views

Moisture Stress Index - how important is seasonal influence in a deciduous forest?

I want to calculate moisture stress index for a deciduous forest using the formula from the article 'Detecting vegetation leaf water content using reflectance in the optical domain' (Ceccato et al. ...
0
votes
2answers
322 views

Calculating vegetation indexes with GDAL raster calculator?

I want to calculate a few of vegetation indexes [ example: NDPI (red band-green band)/(red band + green band)] in a model with the GDAL raster calculator but I don't know how put the equation here: