Skip to main content

Questions tagged [savi]

The Soil-Adjusted Vegetation Index (SAVI) is a modification of the Normalized Difference Vegetation Index (NDVI) designed to correct for the influence of the soil backscatter in the NDVI signal. The tag is intended for questions about calculating or analyzing SAVI data.

Filter by
Sorted by
Tagged with
0 votes
1 answer
269 views

How to calculate LAI for Landsat image collection with SAVI?

I am a beginner in GEE. I am trying to create a model for SEBAL in GEE. I am stuck in a problem with LAI using SAVI. There is a problem with laio :(intermediate value).subtract is not a function *...
Bokhir Alikhanov's user avatar
0 votes
1 answer
3k views

Calculating Soil Adjusted Vegetation Index (SAVI) in Google Earth Engine

I want to calculate the SAVI in Google Earth Engine. I am using the formula as below: ((NIR-Red)/(NIR+Red+0.5))*1.5 The value range should come between -1 to 1. I am using Sentinel 2 image. But after ...
Swadhina Koley's user avatar
1 vote
1 answer
1k views

SAVI time-series chart on Google Earth Engine

I've been trying to generate time-series indexes charts and print it on the panel, but the SAVI index chart ends up looking just the same as the NDVI chart, besides, the range is wrong (0 - 1.5). Here ...
Fernanda Naressi Grandinetti's user avatar
2 votes
1 answer
137 views

Soil Adjusted Vegetation Index in ArcPy

I am attempting to run the SAVI function (found within the Spatial Analyst module) in ArcPy. However, this function is not showing up for me regardless of there being multiple ArcGIS pages with code ...
Katie B.'s user avatar
5 votes
1 answer
1k views

Why vegetation index, NDVI or SAVI is not working in the desert?

Could anyone explain why the vegetation indices are not working in the desert region? I used Landsat 8 image which has been already radiometric/atmospheric corrected. I want to see the fractional ...
Kyoko's user avatar
  • 55
3 votes
1 answer
6k views

Exporting data with different data types in Google Earth Engine. How to make data consistent to download?

I am working with Sentinel-2 data in GEE and I added NDVI and a specific SAVI as new bands to an Image. I had an error downloading 6 bands (RGBI, and VIs) because the data type is not the same: Error:...
Josep Pinyol's user avatar
3 votes
1 answer
7k views

Calculate MSAVI (Modified Soil-adjusted Vegetation Index) in Google Earth Engine

How do you write the MSAVI formula in JavaScript function for Google Earth Engine? I am trying to calculate the MSAVI as a function. The aim is to map the result over a Sentinel-2 composite and not a ...
loloj0's user avatar
  • 390
0 votes
0 answers
522 views

Google Earth Engine: Linear Regression problem to download the image

I made this code to get a Linear Regression using the function SAVI in my own collection but it is not working. Does anyone know why? // Simple regression of year versus NDVI. // Define the start ...
Juan TB's user avatar
  • 393
5 votes
1 answer
2k views

How to apply a Cloud Mask in a collection?

I am trying to apply a mask cloud in a SAVI collection (LANDSAT) to get a chart with time variations between pixels. var region = table3 Map.addLayer(table3) var col = ee.ImageCollection('...
Juan TB's user avatar
  • 393
1 vote
1 answer
866 views

How to use conditional statement to reclassify raster in ArcGIS?

I have a raster whose values range from -1.4 to 1.4. I want to reclassify this to range only between -1 and 1. So all values less than -1 should get a value of -1 and all values greater than 1 should ...
Salman's user avatar
  • 736
0 votes
2 answers
921 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 ...
cecil chams's user avatar
0 votes
3 answers
388 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 ...
Vanludvig's user avatar
  • 147
1 vote
0 answers
295 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....
Swapnil's user avatar
  • 11