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# Questions tagged [correlation]

A measure of the degree of linear association among a pair of variables.

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### Correlation analysis between large number of environmental rasters

I am trying to run a correlation test in R for 761 environmental rasters, but that seems to be too many to run at one time. For context, I have average monthly SST and CHL rasters over roughly 50 ...
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### Computing correlation coefficient between crime vs non-spatial data (such as no. of population) using ArcMap

I have a polygon divided in neighborhoods (barrios) which contains no. of crime (cases) per barrio. Also, in that polygon, there is a column for the total population of that barrio. Now, I want to ...
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### Correlating two space time layers

I have two point datasets, both showing the x,y location and date of separate events (1. environmental event,2. detection of bacteria). I'm trying to understand their spatial and temporal relationship....
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### Interpreting r.regression.multi

I cannot find a source that explains how to interpret the output of r.regression.multi. Can someone explain what the different lines mean; specifically how do I see if the results are significant? X=...
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### Partial correlation of more than two raster stacks

Is there a way to compute partial correlation between three raster stacks? I have 3 rasters namely SIF, SM and VPD. > SIF_stack class : RasterBrick dimensions : 360, 720, 259200, 10 (nrow, ...
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### Assess correlation between two variables in a polygon vector layer

I have a polygon vector layer, and for each polygon (representing administrative zones) I have 2 quantitative variables. My goal is to formally assess whether there is a correlation between those two ...
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### I cannot get the p-value from spearman's Correlation in Google Earth Engine

I am calculating a Spearman's correlation between two bands of an image collection dataset, but when I use the function to get it, it only outputs the correlation coefficients, but not the p-value. ...
3 votes
1 answer
483 views

### Resolution unit calculation

I'm quite new in the field of GIS, currently working with QGIS. I didn't find a simple overview of the connection/calculation of resolution units yet. Is it like this (pixel size for QGIS)? ~ 1km = ...
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### Spatial Cross Correlation between two rasters

I have two raster data land cover and carbon monoxide, and I wish to perform correlation analysis on the two datasets. I found an article online describing the method using RStudio. I have followed ...
1 vote
1 answer
490 views

### How to compute partial correlation of pixels in R

For example, I have 20 years'NDVI and temperature and precipitation rasters. At first,I computed the pearson correlation coefficent with those codes as belows. library(terra) library(Hmisc) ndvi <- ...
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### How can I prevent terra layerCor temp files filling all available diskspace?

I'm trying to analyze a subset of the Woldclim bioclimatic data (19 raster layers) that covers the Canadian Arctic. I'd like to see how correlated the layers are. When using the layerCor function from ...
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### QGIS point cluster correlation

Is there a way to (preferably in QGIS that I actually can use) analyze two sets of point layers and describe the correlation in the espective cummulations? For instance, I have points that experts ...
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### Correlation between two raster images with output as a raster in Google Earth Engine

I have two different rasters, one denoting the climatic parameter and the other denoting the drought impact. Now I want to estimate the correlation between these raster datasets; the output I want is ...
3 votes
1 answer
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### Correlation coefficient and R squared in Google Earth Engine

I want to calculate the correlation coefficient and R squared between two bands for two different images. How should I proceed? var s1_float = ee.ImageCollection("COPERNICUS/S1_GRD_FLOAT"...
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### Creating correlation chart in GEE

I want to create a correlation chart between LST and NDVI (with trendlines and R2 value inside the chart)for an area in Google Earth Engine (GEE). I tried many solutions (adding both images to image ...
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1 answer
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### Correlation analysis between bands in a RasterStack using Google Earth Engine

I am working with several variables in GEE and I would like to do a correlation analysis with them. I have constructed a Raster Stack with the variables and then I sampled the region with 10.000 ...
1 vote
2 answers
67 views

### Accurately estimating non-linear relationship between two rasters

I am wanting to estimate the relationship between two rasters in R, but am having some trouble thinking through how I should do it. I am providing a toy example. For example, suppose x (e.g. NDVI) is ...
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1 answer
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### How to analyze Pearson's correlation and VIF between raster layers using R?

I have 30 raster layers (.tiff) on oceanic and climatic environmental variables from all over the world downloaded from global databases. I need to analyze the relationship that may exist between ...
2 votes
1 answer
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### Calculating spatial correlation between two datasets using ArcMap and Spatial Analyst

I am using ArcMap and the Spatial Analyst extension. I am trying to find a correlation between my raster datasets. For example, for Net Primary Production (NPP) model I used too many input datasets ...
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2 answers
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### Pixel based Correlation for 2 Rasters

I was working with Pollution data from OMI i.e. NO2 & O3. I need to find the correlation between the two rasters. I need pixel-based correlation, but in ArcGIS Pro, I could only find point-based ...
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1 vote
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### How to do a Correlation of various Raster Data and show the result in a Correlation Matrix

I am doing spatial correlation of soil Data sets. I did various Kiriging Interpolations with the krige function. The output was cut to a target raster to have the same raster size for all Kriging ...
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1 answer
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### Error while exporting plots results from cor function in a for loop over subfolders

I'm trying to plot the results from cor function that is running over multiple subfolders that contain TIF files. The process I have followed so far didn't work. It seems there is a problem while ...
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1 answer
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### How to correlate NDVI and Land Surface Temperature in QGIS? [closed]

I'm looking for ways to correlate the NDVI values and the land surface temperature values that I have on QGIS. I'm kind of new at using these kinds of programs. I'm working on a thesis and for my ...
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1 answer
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### Correlating Worldclim data with vif function in R

I want to corelate 19 variables from Worldclim V2.0 using the vif test. There's no ready code like for V1 so I wrote a code below but I'm facing one error. I'm new to R. library (raster) library(usdm) ...
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2 votes
1 answer
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### Calculating correlation between points and raster values with missing points (need missing as 0s) (QGIS)

I feel like this should be easy but I'm struggling. I have a raster data set of Topographic Wetness Index (TWI) and a point data set of crop yield. I want to see how TWI and yield are correlated by ...
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### How to output a raster of special case's distribution with regard to overall distribution?

For example, the crime scenes are unevenly distributed in a city. Each case's scene can be represented as a point. Thus, we can generate a raster map, which shows the crime scenes' density in this ...
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### Add corresponding MODIS LAI band to Sentinel-1 log(VH/VV) data in Google Earth Engine

I am trying to determine the correlation between Sentinel-1 log(VH/VV) data and the corresponding MODIS 4 day LAI product. For the first step, I am trying to add the corresponding LAI data as a band ...
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### Correlation between a nominal and a continous rasters in R

I have two rasters of which one has nominal scale and the other has continuous scale. I used rasterCorrelation() function from spatialEco package in R and got a sensible map as well. But as one raster ...
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1 vote
1 answer
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### Finding significant co-occurrence between data points

I'm rather new in the field and I'm looking for advice in a problem. I have a data set of several data points, each with category, latitude and longitude. How can I find if there is a significant ...
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1 answer
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### How to select one band in image using rasterio

I have two different images and I want to select one specifi band from each one of them and calculate regression between them. Each one of those bands is a result of calculation I did (in the first ...
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1 answer
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### Calculating pairwise Spearman's correlation coefﬁcients for multiple raster layers in R [closed]

I have six raster datasets with matching resolution and extent. I want to analyze the relation between those rasters by calculating pairwise Spearman's correlation coefﬁcients for all combinations ...
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1 answer
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### Assessing if two variables (measured at point locations) covary in space?

I have a number of (point) locations at which two variables are measured. The two variables proves correlated (when using Spearman's r; the direction of the correlation is irrelevant here). How can ...
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2 votes
2 answers
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### Pearson correlation of two 1D array in Earth Engine

This GEE documentation addressed the correlation chart of two bands over a region. // Define an arbitrary region of interest. var sanFrancisco = ee.Geometry.Rectangle([-122.45, 37.74, -122.4, 37.8]); ...
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### Preparing raster Image for correlation in ENVI 5.5

I am working with two raster image of the same location with the same extent, both projected to the same coordinate system and having the same cell size. I want to correlate the raster value on the ...
0 votes
1 answer
457 views

### Correlating Point Samples and MODIS SST in Google Earth Engine

I've got a dataset of ~60 points that we've taken during a series of oceanographic cruises where we were sampling, among other things, sea surface temperature. I'm interested in comparing these point ...
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2 answers
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### Correlation between raster pixels within each polygon

I have two raster layers with the same extent, CRS, and resolution, and a shapefile consisting of a number of polygons. I would like to calculate the Pearson correlation between the two rasters within ...
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2 votes
0 answers
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### Classify / section line or group of points according to shape (with shapely objects)

Is there any python module/function that classifies/sections a shapely line according to the shape the line forms? If not, I could do it with the positions of the points that form the line. I would ...
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2 answers
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### Pixel correlations from two raster datasets in R

I am having trouble calculating the pixel by pixel correlation coefficient between two datasets. My current code takes in two folders full of rasters and creates two independent raster stacks. These ...
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1 vote
1 answer
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### Correlation/relationship between map layers in R?

I have a point shapefile concerning asthma instances, a point shapefile concerning rainfall, and a polygon shapefile with population information i.e gender, ages etc. I would like to research if ...
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2 votes
1 answer
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### Doing spatial correlation between two sets of rasters in R

I have two sets of rasters from 2001-2016. Obviously, these two are correlated to each other but I want to produce a map showing the degree of their correlation. The Correlation Coefficient will be ...
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1 answer
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### Using a template matching correlation image to extract lines

I need to measure the length of the rows which are visible in the images. I have used template matching with a portion of the row as the template. Along a row, there will be matches which are ...
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1 answer
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### Pearson correlation in R?

I have two different parameters raster data, Which are temperature (X) and precipitation (Y). For temperature (X) and precipitation (Y), each parameters have 12 data files (Tiff format). I want to ...
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### Exploring the association between two variables on QGIS

I am doing a project on primate electrocutions. I have primate population density data - in the form of point data for each troop, and in the attribute table I have the total number of monkeys for ...
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1 answer
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### Test Statistic, p-value interpretation for Local Moran's I [closed]

I am using Local Moran's I in the spdep in R. See this question: https://stackoverflow.com/questions/44104008/spatial-autocorrelation-between-time-series-in-r?noredirect=1#comment75251231_44104008 ...
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1 vote
1 answer
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### Autoregressive parameter from autocorrelation using R

I was wondering how to get autoregressive (AR) parameter ("rho") from an autocorrelation plot using R. Below I generated a correlated data and then provided a simple approach to produce an ...
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1 vote
2 answers
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### Correlating number values with text values from different fields in ArcMap?

I need to create a vector layer for representing the geology of an area. I have the geological map, a raster file. I made some polygons and I named them in the attribute table, but I don`t want to ...
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### How to test for correlation between two point data sets

I want to determine if there is a correlation between weed plant species density and habitation (buildings). Both data sets are points. The weed species has an 'abundance value' (i.e., one point may ...
1 vote
1 answer
638 views

### ArcGIS- Band collection statistics tool correlation less than -1?

I am trying to work out the correlation coefficient using band collection statistics in ArcGIS 10 between 2 rasters (a sea surface temperature raster and a storm genesis density raster created using ...
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3 votes
3 answers
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### Correlation between layers

I am trying to determine the relationship between multiple factors (slope(from dem-raster), aspect(from dem-raster), proximity to settlements (buffers-polygon)) with fire events(point data, with date ...
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4 votes
1 answer
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### Finding correlation between two rasters in ArcGIS for Desktop?

I am working with a NDVI image and a an interpolated yield map in ArcGIS 10.3.1. They are both projected in the same coordinate system and the cell sizes are equal. I interpolated the yield harvester ...
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