All Questions
25 questions
0
votes
1
answer
267
views
I am using BFAST to do a time series analysis of LST and I am getting NaN errors
This is the blog post I refer to, https://philippgaertner.github.io/2018/04/bfast-preparation/, and the author's code is as follows:
# NDVI data
data(tura)
selected_pixel <- 90 represents a ...
- 1
0
votes
1
answer
194
views
Projection problem with VIIRS-SNPP Deep Blue Aerosol data in R
I am having some trouble with VIIRS/SNPP Deep Blue Aerosol (DBA) product in R. After post-processing the data, I am not being able to obtain the data in the region of interest (ROI), hence I checked ...
- 100
2
votes
1
answer
405
views
Create Function to a RasterStack
This is the function that I want to create:
Erosivity_Factor = 1.74 * log[sum(montly²/annual)]+1.29
I have solved it using a loop:
# Reproducible RasterStack with 12 layers
Monlty<- stack(lapply(1:...
1
vote
0
answers
385
views
MSAVI vs NDVI for deserts
I calculated NDVI (Normalised Difference Vegetation Index) and MSAVI (Modified Soil Adjusted Vegetation Index) for a desert environment, where most of the vegetation is shrubs with some trees using ...
- 1,244
2
votes
1
answer
309
views
Remote sensing product's raster extent not agreeing with specified projection in R
I want to plot remote sensed sea ice concentration data for Antarctica, in Program R. The product website (http://cersat.ifremer.fr/data/products/catalogue) says the data are in Antarctic polar ...
- 25
2
votes
2
answers
5k
views
Extract cell values and coordinates from raster using a polygon in R
I'm trying to extract cell values and coordinates from raster using a polygon in R. I have multiple raster layers with different types of values, all within the same extent. I have multiple polygons ...
- 21
1
vote
1
answer
229
views
How to modify MODIS subset function to download product for a specific region and time period?
I am trying to assess the land cover change that has occurred over East Asia over last 18 years only in winters (Oct-Jan) for which I want to use MOD13Q1 dataset of modis from 2000-2018. I am using ...
- 335
-1
votes
1
answer
6k
views
Select pixel values in a raster using R
I'm trying to select some cell values in a raster MODIS. Follow my problem:
I have to filter these values to mask after it: 32767,32766,32765,32764,32763,32762,32761
I've used this code to one value:...
- 11
0
votes
0
answers
340
views
Cloud detection in various scenes in R
I have 99 LS8 scenes (mountainous terrain) and before processing them any further I would like to mask out cloudy and snow pixel since they might mess up the topographic correction I have to apply. My ...
- 137
2
votes
2
answers
2k
views
R: Display single band raster in true color
I have a static image of a Bing maps tile (Mercator EPSG: 3857) with satellite overlay in PNG format. I read the PNG as a raster and georeferenced it in R by setting the corner coordinates using the ...
- 433
0
votes
0
answers
86
views
Averaging MODIS 8-day LST for each pixel in a region to generate annual mean LST [duplicate]
I have downloaded 8-day MODIS LST products (MOD11A2) for the whole year of 2011 and is there any method in R to extract those pixels in clear sky conditions with emissivity error < 0.01 and LST ...
- 31
3
votes
1
answer
1k
views
Calculation of fractional cover for each vegetation class at 30-m resolution matching MODIS swath in R
Currently I have a Landsat land cover map with 30-m resolution and I want to calculate the fractional cover for each vegetation class (forests, grasslands and croplands etc.) matching MODIS swath and ...
- 31
0
votes
2
answers
977
views
Stop WriteRaster in a for loop in R
I just picked up R this summer.
I created a nested for loop so that nls() will be performed in 24 raster layers and a new file will be created to save the data.
In this example, I have a raster ...
- 13
1
vote
3
answers
1k
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 ...
- 316
2
votes
1
answer
1k
views
Unable to writeRaster for signature "rasterPCA", "character"
I am currently trying to obtain two rasters that are the Principal component axes 1 and 2 for a list of bioclimatic variables that I am using. I am using the rasterPCA() function that exists in the ...
- 1,342
0
votes
2
answers
1k
views
Accuracy Assesment in R
I there a way to calculate the accuracy of a classified image (users-, producers accuracy, Kappa) in R, assuming I have a two columns matrix. On of the columns would contain the values that came out ...
- 3,460
1
vote
1
answer
2k
views
Remove raster pixel in R
This is the 32 year trend NDVI (raster data)
I would like to remove the green grids data by using R (the green pixel value is larger than 0.03)
and this one is R code that i use but i cannot remove ...
- 51
5
votes
1
answer
504
views
Loop NDVI calculations for hyperspectral datacubes in R
I am writing a script for the processing of different hyperspectral datacubes. The datacubes contain flight lines that I've recorded with a UAV. In total there are 10 flight lines that need to be ...
- 301
1
vote
2
answers
241
views
Improves performance on R working with raster files
I´m trying this code to look for NA and negative pixel values and replace it for 0. But it´s too slow. Any tip for improve the performance of it?
"all.files" is a list of address of the images. "r1" ...
- 419
0
votes
1
answer
350
views
Extracting Data from Raster based on Aspect Raster file
I have 2 rasters, ones shows aspect and another shows date of snow thaw. I want to extract the date of snow melt based on values from the aspect raster. For example I want all the snow thaw dates from ...
- 57
10
votes
3
answers
6k
views
Remove clumps of pixels in R
I would like to remove isolated pixels (or clumps of pixels <9) from my raster image.
library(raster)
# create some raster data
r <- raster(ncols=12, nrows=12)
set.seed(0)
r[] <- round(runif(...
- 3,386
7
votes
2
answers
11k
views
How to write every raster from a list of rasters?
I have created a list of rasters - "norm" and run a several loops. Now I would like to write every created raster from "norm" (containing 1 layer) into one raster, having its specific name.
# I can ...
- 3,386
10
votes
1
answer
8k
views
Importing multiple stacked raster images in R?
I would like to import all multiple mosaic rasters (each mosaic is composed by 7 layers) from indicated folder into my R. Then access them as single multilayers rasters.
So I did:
# read all mosaics ...
- 3,386
3
votes
0
answers
472
views
R: Can raster predict function pass to predict.rfsrc (a prediction function in a parallel verion of RandomForest)?
It seems that raster predict function can pass to predict.randomForest by setting the "type='response'". I am using a parallel version of randomForest package called the "randomForestSRC" and I am ...
- 31
2
votes
1
answer
1k
views
Running Random Forest Classification on WorldViev-2 image in R - problem
I have a problem with performing RF in R for a WorldView-2 Scene. I've never ever before used R for remote sensing classification, so I simply followed what is written here.
I've loaded scene (8-band ...
- 23