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Questions tagged [savi]

Savi is an acronym for the Soil-Adjusted Vegetation Index

3
votes
1answer
135 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 ...
0
votes
1answer
289 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: ...
2
votes
1answer
616 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 ...
0
votes
0answers
168 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 ...
4
votes
1answer
1k 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('...
0
votes
1answer
232 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 ...
0
votes
2answers
501 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 ...
0
votes
3answers
214 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
vote
0answers
177 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....