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# Questions tagged [correlation]

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

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5k 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 ...
6k 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 ...
4k views

### Similarity between two raster maps

Having two raster maps as the examples below: We are interested in evaluating their similarities. As shown, they are not fully overlapping. We guess one way is to clip small one area from the bigger ...
3k views

### Scatterplot between two rasters in R?

I am very new in programming and I want to ask how can I make a scatterplot of two rasters in R and also get their correlation?
14k views

### How to do spatial correlation between two variables on ArcGIS 10.1?

I have two raster 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 ...
246 views

### Correlation between corn yield and planting speed using ArcGIS for Desktop or QGIS?

I have two maps that originally come from a harvester and a tractor as shapefiles: Corn Yield and Planting Speed. I would like to know what would be the best procedures to statistically answer the ...
2k 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 ...
2k views

### Scatterplot, correlation of dependence and r-square between two rasters

I have two rasters of the same region and of same resolution and I want to plot in a scatter plot their values and compute the best - fit line with r-square. Any idea how can I do this on Arcmap or ...
516 views

### How to disassociate roughness from slope

How to measure topographic roughness irrespective of slope in ArcGIS? I have used many methods to generate roughness layers, including TRI, VRM (which is supposed to be less correlated with slope), ...
1k views

### Which Statistical Test to use?

I aim to determine whether there is a correlation between terrain variables (elevation, aspect and slope) and structural information acquired in forest survey. I have used ArcMap's extract multi ...
421 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 ...
2k views

### Correlation between a raster and a point dataset

I have an interpolated surface (in raster form) with temperature values and I also have the measurements of temperature in certain locations that belong to the same region (with the raster). I want to ...
3k 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. ...
732 views

### How to infer a relationship between two spatial points using R

I am quite new to the area of spatial statistics, but I'm very interested. For learning and demo purposes, I've created three datsets. Dataset - Persons: This describes individuals at a certain ...
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 ...
110 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 ...
79 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 ...
167 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 ...
301 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 ...
38 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 ...
250 views

### Comparing/Correlating NDVI Rasters with other index Raster

So, I've created two rasters. One for NDVI and one for another index for surface water from the same orthorectified World-View 2 image. I can visually see how the indexes are inversely proportional. ...
508 views

### Difference between raster subsets as defined by another raster? [closed]

I wish to determine whether there is a relationship between slope and the Corine land cover class pastures. i.e. whether areas defined as pasture have a different slope to non-pasture areas. I've ...
93 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 ...
342 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 ...
1k views

### Finding correlation between point location and raster value

I have what I thought was a very simple problem but I think I may have over thought it... I have a population density raster and a point feature layer showing the locations of X (about 70 points). ...
42 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 ...
850 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 ...
252 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 ...
171 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 ...
45 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,...
88 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 ...
1k views

### Correlation analysis of two polygon shapefiles with nominal data

I am working on a research- trying to model vegetation types based on factors affecting their distribution. In that case I have observed a strong relation between vegetation and soil types, from just ...
837 views

### Testing correlation between two polygon features

I am working on a project looking at county boundaries for the state of California. I have 2 polygon datasets with this same geographic boundary, and these datasets, when mapped individually, visually ...
140 views

### Profile curvature and soil moisture correlation: issue in interpretation

I have a question related to the profile curvature values. In an article I was reading (reference provided at the bottom of this question), scholars have found a negative correlation between profile ...
137 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 ...
723 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,...
71 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 ...
263 views

### Correlation between point feature (disease) and elevation [closed]

I have a problem! How can I calculate the correlation between point feature and Dem raster? Hypothesis: disease prevalence in high altitude is more than low altitude. I must do this in ArcGIS 10 and ...
2k 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 ...
619 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 ...
944 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 ...
27 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 ...
116 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 ...
1k 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 ...
239 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 ...
18 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 ...
51 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 ...
22 views

### How to compare a TPI raster map (continuous variable) with a land-use raster map (wetlands - categorical variable)?

I want to compare two maps (covering the same area extent): a raster map of the Topographic Position Index (TPI) with values ranging from 0 to 100. This is a continuous variable. a raster map with ...