Questions tagged [correlation]

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

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Calculating spatial correlation between two dataset 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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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 ...
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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 ...
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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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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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22 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 ...
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24 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 ...
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1answer
95 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 ...
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1answer
77 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) ...
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1answer
82 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 ...
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How to scatter plot the raster data of LST and NDVI?

From the scatter plots, the dry edge and wet edge is to be determined to calculate soil moisture. I have used the MODIS products of LST and NDVI for determining the soil moisture index.
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How to calculate Pearson correlation in ArcGIS for an erosion map and the controlling factors

I have 5 factors that I need to correlate with the resulting erosion map, my question is what are main steps to do this is it on ArcGIS first then on Excel or just in Excel in order to do the Pearson ...
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Correlation-Calculation with missing values

I want to do a pixel-based analysis to detect the crop-type over a year using HLS data. So far I managed to get curves for NDVI of different crop-types over a year and my data for each pixel. Since ...
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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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115 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 ...
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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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123 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 ...
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1answer
367 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 ...
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1answer
666 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 ...
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1answer
35 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 ...
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1answer
132 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 ...
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1answer
268 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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908 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 ...
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227 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 ...
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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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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 ...
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1answer
5k 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 ...
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1answer
311 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 ...
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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 ...
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378 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 ...
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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 ...
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1answer
379 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 ...
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2answers
102 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 ...
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172 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 ...
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1answer
451 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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2answers
608 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 ...
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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 ...
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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 ...
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1answer
200 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 ...
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862 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,...
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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,...
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1answer
120 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 ...
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1answer
93 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 ...
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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. ...
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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 ...
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620 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 ...
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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 ...
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76 views

Choosing the range of the correlogram with an irregularly shaped area

I am doing correlograms (Moran's I) between 125 plots. Those plots are located in large patches in my study area (see figure). The entire study area is approximately 2000 x 2000 m. I know that the ...
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1answer
82 views

Can I use areal mean pixel value in raster for input to Extract Values to Point tool

I have a dataset consisting of a point vector file (plant leaf area) overlaid and georeferenced to a raster file (soil moisture) that I want to use as inputs to the Extract Values To Point Tool in ...
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1answer
1k views

Correlation between raster values and vector point values

I will be using aerial photography/Object Based Image Analysis to separate plants in a field from their background, creating a polygon for each plant. I will then convert these polygons to point on ...