Questions tagged [correlation]

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

Filter by
Sorted by
Tagged with
0
votes
0answers
38 views

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"...
1
vote
1answer
51 views

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 ...
0
votes
1answer
76 views

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
1answer
26 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 ...
-1
votes
1answer
30 views

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
1answer
69 views

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 ...
0
votes
0answers
17 views

Calculating the correlation coefficient of one pixel with the surrounding pixels in same raster

I am working on a problem in which I have 20 years of daily data (raster). I have a point shapefile with 123 point locations. Now first I need to select the particular pixel on which the point ...
0
votes
0answers
16 views

What do the following eigenvalues/eigenvectors tell me regarding the bands in the following LANDSAT TM image?

I am struggling to understand the interpretation for eigenvalues for a false-color NIR LANDSAT TM image. The image is shown below. (Note: I'm using ENVI Classic, but this is a general question and not ...
0
votes
2answers
104 views

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 ...
1
vote
0answers
25 views

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 ...
0
votes
1answer
23 views

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 ...
0
votes
0answers
25 views

How does the resolution of two raster images affect their correlation?

My question is a bit theoretical. Imagine that I have two raster files (raster A and B). Raster A has grid cell size of 1 km and raster B has grid cell size of 100 m. I would like to like to estimate ...
0
votes
1answer
117 views

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 ...
0
votes
1answer
123 views

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) ...
2
votes
1answer
114 views

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 ...
0
votes
0answers
20 views

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 ...
0
votes
1answer
127 views

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 ...
0
votes
0answers
49 views

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 ...
1
vote
1answer
147 views

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 ...
1
vote
1answer
505 views

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 ...
-1
votes
1answer
849 views

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 ...
0
votes
1answer
36 views

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 ...
1
vote
2answers
1k views

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]); ...
0
votes
1answer
151 views

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
1answer
285 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 ...
-1
votes
2answers
962 views

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 ...
2
votes
0answers
249 views

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 ...
0
votes
2answers
3k views

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 ...
0
votes
1answer
1k views

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 ...
1
vote
1answer
6k views

How to do 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 ...
0
votes
1answer
327 views

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 ...
0
votes
1answer
1k views

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 ...
2
votes
0answers
395 views

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 ...
1
vote
1answer
1k views

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 ...
1
vote
1answer
401 views

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 ...
1
vote
2answers
104 views

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 ...
1
vote
0answers
185 views

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
1answer
474 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 ...
3
votes
3answers
658 views

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 ...
4
votes
1answer
3k views

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 ...
2
votes
0answers
39 views

minimum number of pixel points for regression on atmospherically corrected satellite images

I am performing atmospheric correction on a Landsat 8 image using different methods to check which one works best (in order to proceed with further/subsequent analysis). Wondering if it's okay to use ...
1
vote
1answer
211 views

Is there a spatial gradient in my data

I already posted the question here, but I thought that maybe it is a question for GIS as well. I have a grid with densities of one animal and would like to find out if there is a spatial gradient in ...
1
vote
0answers
876 views

R-Studio0.99, How to compute correlation between two rasters and serial correlation

I am using R.Studio0.99 version installed on my HP Laptop 4th generation (8GB RAM) windows 8 operating system and I know how to use R studio and some of the library to incorporate spatial data (raster,...
1
vote
1answer
46 views

Correlating 3 data sets and extracting information from each in ArcGIS for Desktop?

I am currently trying to find a way to correlate 3 separate datasets as point shapefiles. I would like to import all three shapefiles, and apply a 5 metre buffer to each point. Then, for each point,...
2
votes
1answer
122 views

Correlation of yield data within a buffer zone [closed]

Working with QGIS 2.12.1-Lyon, I am trying to compare one point (single shapefile) with multiple others that fall within a buffer zone of 10m i.e. comparing one shapefile with another. The end ...
1
vote
1answer
94 views

Correlating raster layers

I am trying to correlate contaminant data with other variables. For instance I want to see if high values of contamination coincide with topographic lows in my elevation raster (DEM). All the layers ...
3
votes
1answer
4k views

Doing spatial correlation between two layers on ArcGIS?

I have two datasets and I'm trying to determine the extent of their spatial relationship. I suspect they are closely related but I would like to produce a map output to illustrate this relationship. ...
9
votes
1answer
8k views

Spearman correlation between two rasters in R [closed]

I have two rasters of the same area. The only difference is that they were created using two different methods. I would like to compare them and see how correlated they are pixel by pixel. Any ideas ...
0
votes
0answers
684 views

How do I statistically compare two maps?

I need to statistically compare two maps in order to determine if the spatial distribution of the data is correlated or not. I have two files in ArcGIS XY location of foreign-owned firms XY location ...
12
votes
1answer
6k views

Calculating spatial correlation between features from two separate layers in QGIS

I am trying to determine whether the presence of large numbers of active duty military troops in an area is spatially correlated with higher/lower levels of violent crime. That is, are the areas ...