spatialpack's Introduction

Tools for assessment the association between two spatial processes

Tools to assess the association between two spatial processes. Currently, several methodologies are implemented: A modified t-test to perform hypothesis testing about the independence between the processes, a suitable nonparametric correlation coefficient, the codispersion coefficient, and an F test for assessing the multiple correlation between one spatial process and several others. Functions for image processing and computing the spatial association between images are also provided. SpatialPack gives methods to complement methodologies that are available in geoR for one spatial process.

Authors: Felipe Osorio and Ronny Vallejos with contributions of Francisco Cuevas and Diego Mancilla.

Project webpage: http://spatialpack.mat.utfsm.cl

Lastest binaries and sources for SpatialPack are availables from CRAN at: https://cran.r-project.org/package=SpatialPack

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Error in storage.mode(y) in UAV SAR backprojection image

Hi Everyone,

I have an UAV SAR backprojection image sample and I'd like to reduces the speckle noise using the denoise but doesn't work for me.

I try to do:

#Packages
library(raster)
library(datawizard)
library(SpatialPack)

# Open UAV SAR imagery small sample
UAV_SAR_BandC <- raster("https:/github.com/Leprechault/trash/raw/main/BandC_sample.tif")
UAV_SAR_BandC
# class      : RasterLayer 
# dimensions : 257, 337, 86609  (nrow, ncol, ncell)
# resolution : 0.2, 0.1999516  (x, y)
# extent     : 521061.4, 521128.8, 7320125, 7320176  (xmin, xmax, ymin, ymax)
# crs        : +proj=utm +zone=22 +south +datum=WGS84 +units=m +no_defs 
# source     : BandC_sample.tif 
# names      : BandC_sample 

# Rescale UAV SAR imagery to 0-255 using datawizard package
BandC  <- datawizard::rescale(values(UAV_SAR_BandC),to = c(0, 255))
values(UAV_SAR_BandC) = as.vector(BandC)
summary(UAV_SAR_BandC)
#         BandC_sample
# Min.        0.000000
# 1st Qu.     3.643145
# Median      8.204007
# 3rd Qu.    16.996258
# Max.      255.000000
# NA's        0.000000

# Denoise speckle UAV SAR imagery
UAV_SAR_BandC_filter <- denoise(UAV_SAR_BandC, type = "Lee", looks = 1, damping = 1)
# Error in storage.mode(y) <- "double" : 
#   no method for coercing this S4 class to a vector

Please, any help with this error?

Thanks in advance!

Documentation does not specify how input coordinates should be formatted/ distance is calculated for modified test.

modified.ttest gives different results when different coordinate formats are used and it is unclear what would be the most correct one because it is not specified how distances are calculated. In particular, it is unclear whether I can use LAT/LON or whether I need to use a project coordinate system to get accurate results.

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spatialpack's Introduction

Tools for assessment the association between two spatial processes

spatialpack's People

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spatialpack's Issues

Error in storage.mode(y) in UAV SAR backprojection image

Documentation does not specify how input coordinates should be formatted/ distance is calculated for modified test.

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