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Questions tagged [correlation]

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

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1answer
23 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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0answers
16 views

Creating scatter plot between to images in QGIS,ENVI or GEE

I have two images , for each one I have created new calculated band. Now I want to create scatter plot and to create statistic for the correlation between the values of those two bands for those ...
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1answer
73 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
25 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
59 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
104 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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2answers
495 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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0answers
145 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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2answers
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 ...
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1answer
564 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
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 ...
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1answer
224 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
902 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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0answers
290 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
818 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
240 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
90 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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0answers
129 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
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1answer
331 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
379 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
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1answer
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 ...
2
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0answers
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 ...
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1answer
167 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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0answers
707 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
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,...
2
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1answer
109 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
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 ...
3
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1answer
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. ...
7
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1answer
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 ...
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0answers
426 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 ...
10
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1answer
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 ...
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0answers
68 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 ...
2
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1answer
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 ...
2
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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 ...
4
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1answer
244 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 ...
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2answers
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 ...
1
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1answer
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). ...
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2answers
501 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 ...
1
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1answer
811 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 ...
-1
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2answers
192 views

spatial relation between springs (points) and geological faults (polylines)

In ArcGis 10.1 (advanced license), I have digitized the geological faults (polylines) and the location of water springs (points). Since, relying on literature, there is a potential connection between ...
3
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2answers
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 ...
4
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1answer
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?
3
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3answers
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 ...
3
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1answer
505 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), ...
3
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2answers
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 ...
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0answers
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 ...
1
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1answer
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 ...
2
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0answers
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. ...
4
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2answers
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 ...
2
votes
1answer
721 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 ...