Questions tagged [spatial-statistics]

The field of study concerning statistical methods that use space and spatial relationships (such as distance, area, volume, length, height, orientation, centrality and/or other spatial characteristics of data) directly in their mathematical computations.

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31 views

Measuring average distance between two different attributes using QGIS

I am trying to show the statistical significance of two QuickOSM attributes - school location and fast food restaurants. I am then trying to relate that to overall obesity levels for boroughs in ...
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1answer
33 views

Statistical analysis for comparing natural environment to human settlement environment in QGIS [closed]

Within a larger area, I have a series of polygons (the area within the dotted lines), each of which represents the exploitation area of a prehistoric site. The backdrop for this analysis is another (...
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10 views

Visualizing link statistics in a graph-base network [closed]

I am new with QGIS. I have a graph-based network where the links have the following structure: I also have 4 datasets with link statistics as below: Any suggestions on how to evaluate these results ...
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55 views

How maxent's algorithm uses data to predicte distribution of species

Using the same list of occurrences with present and future bioclimatic variables (worldclim) I get two obviously different distributions. In the case of the future projection, I assume that the ...
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36 views

How to study the association between categorical rasterised environmental variables in R?

I have a set of environmental variables in raster format where I want to study the dependencies between them. To do so I was thinking of using association tests such as chi-squared test. I want to ...
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42 views

SPML (spatial panel models): Unbalanced panels

I am making spatial panel models from the splm library but I cannot make a fixed or random effects model because it comes out that it is an unbalanced panel. Data data and shp files Reproducible ...
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1answer
27 views

How to supply a weight matrix to focal_hpc in R

I'm using the function focal_hpc from spatial.tools in R to compute for each cell of a raster the average value (mean function) around windows of a specific size (3 cells x 3 cells). I used to perform ...
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2answers
48 views

Dividing Polygon into parts which have equal area using R

I have a Multipolygon and want to split it into parts with an equal area. How can I do it using R? my data: pol <-readOGR("/Users/Desktop/test.shp") pol_wkt <- wicket::sp_convert(pol) ...
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1answer
80 views

Comparison with different resolution rasters

The purpose is to compare the fractional snow cover of the coarser pixel to the binary snow cover (0 for no-snow and 1 for snow) of lower resolution pixels. Both the datasets are of the same area and ...
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1answer
40 views

Checking distribution of raster layer using ArcGIS Desktop

I am using ArcGIS Desktop. How do I see if my layer has a normal distribution in order to standardize it? I have calculated statistics, but have not been able to see how my data is distributed.
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If there is no spatial autocorrelation, should the spatial cluster detection be performed?

I have a regional count data of disease incidence. First, I calculated empirical Bayes estimate of standardized morbidity rate. Then I performed global Moran's I to check for spatial autocorrelation ...
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35 views

How could I classify every county in this US as flat, hilly, or moderate? [duplicate]

I'm looking for a VERY rough label for every county, so low-res data is fine here. Is there data on existing elevation change per county? Or should I get an elevation layer of the US and do a zonal ...
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How do I make a variogram of my model residuals in R?

I have a csv file containing LST values for several study sites, canopy cover for each study site, and impervious cover for each study site, and the geographic x/y coordinates for each study site. I ...
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25 views

Testing for spatial autocorrelation in residuals of OLS regression

I'm currently working on a dataset that is most likely to have spatial autocorrelation issues. In particular, I have observations at the region level and I'm trying to run a regression to check ...
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13 views

Use of internal weights for Weighted Overlay suitability modeling

I have derived 'external criterian weights/overall factor weights' applying Pairwise Comparison table. Similarly, pairwise comparison table was used to calculate 'internal weights' separately for each ...
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3answers
47 views

Using Python if/then codeblock to determine line segment lengths in ArcMap Field Calculator

Can anyone help me create a codeblock using an if/then statement through the Python parser in Field Calculator, to calculate the length of a line segment when the value of a different field is a ...
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18 views

Test for spatial uniformity of areal variable

Suppose we have data for uniform polygons with weight variable n and value variable x representing an average of observations within each polygon that looks like this: n x ...
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27 views

Average Kernel Density as Dependent Variable in Regression

I have point pattern dataset and I estimated a kernel surface from it. I want to use a census tracts average kernel density as a dependent variable in regression analysis. Is OLS appropriate or should ...
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1answer
51 views

Alternatives for the Emerging Hot Spot Analysis/Mann-Kendall statistic (less than 10 time steps)

I came across ESRI's Emerging Hot Spot Analysis (Space Time Pattern Mining toolbox) and really like what it does. Unfortunately for me, it relies on the Mann-Kendall statistic which apparently needs a ...
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19 views

What is Percentage of Spatial Connectivity - Spatial Weight Matrix

Generate Spatial Weight Matrix tool in ArcMap and ArcGIS Pro has an output item as "Percentage of Spatial Connectivity". I am wondering how this is calculated and what it represents. This is ...
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11 views

Statistical measure to express confidence of colocalization hotspots

I am new to analyzing spatial data and I am having trouble refining the following problem formulation: I have 4 species, captured in 4 separate channels (plotted below). I would like to identify spots ...
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17 views

How to calculate hot and cold spots using ArcGIS

I have to calculate the GiZScores to Dengue incidences in District wise.This should be done using ArcGIS software by using Getis Ord GIS tool. But the problem is that I have to use climatic factors (...
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30 views

Why does function raster.Zscore in package spatialEco not work in R after installing?

I want to calculate the z-scores for a rasterstack. I downloaded the package spatialEco from https://cran.r-project.org/web/packages/spatialEco/index.html Now it is not possible to write and run the ...
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22 views

Is there an R function for creating neighbors list from polygons based on both proximity and adjacency (contiguity)?

I am trying to perform hotspot analysis on non-contiguous US shapefile (48 states plus Alaska and Hawaii) using Getid Ord G stat (at the county level). In order to use getid Ord G, I need to create 1. ...
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33 views

Is there an R function for creating spatial weight matrix for “spatial difference in differences” method?

I am trying to apply "spatial difference in differences" method in R for a US county's block groups (n block groups) over 2 different times (2000 and 2015). In order to do this spatial ...
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26 views

Accounting of strength of spatial autocorrelation between some grocery stores in distance 500 meters

I'm analyzing sales one supermarket chain and I want to know how other neighborhood stores influence on turnover store. I have data about other stores and their location. As a result, I need to get ...
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21 views

Comparing results of cross K-L functions for point patterns

Given marked point patterns with types a, b, and c, spatstat in R allows to easily calculate cross K(a,b) and L(a,b) functions. Envelopes can be used to estimate the significance at a given alpha (0....
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12 views

Controlling for 1st order effect when testing for spatial association between points of two different patterns

Background I have a follow-up question relative to a question I asked long time ago link to earlier question. I am asking a new question since this is something new, even though it builds on the ...
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1answer
53 views

R: calculating overlap between two standard deviational ellipses

Aim Calculating the area of overlap of two standard deviational ellipses in R and work out their intersection and union. Tool to be used calc_sde() from the 'aspace' package: calc_sde() Question ...
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1answer
210 views

Computing annual spatial (zonal) statistics of a NetCDF file for polygons in shape-file [closed]

I have a NetCDF-file containing annual GDP data for Africa. I also have a shape-file containing provinces in Africa as polygons. I now want to compute statistics (ie. mean, sum, ...) per polygon ...
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1answer
115 views

Convert raster to polygons, crop, reproject

I wish to map a high-resolution grid of population counts of Korea and extract from it the Seoul Capital Area (SCA) at the same level of resolution. The population data comes in two forms: raster (...
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22 views

Performing IDW interpolation with an output weighted by a different variable

I'm relatively new to spatial analysis. I'm trying to create an IDW map for SPI. However, I'm "correcting" the SPI so it gives a different value based on elevation. For example: Point A on the map ...
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1answer
46 views

QGIS 3: equivalent tool/plugin of ArcMap's Spatial Join within a Distance

I would like to do a join by location between two point layers in QGIS 3 (3.4.10, Coruña). I would like to get the mean (or median) value of an attribute all the points of point layer 2 within a 5 ...
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17 views

Spatially constrained multivariate clustering

What's the current methodology for clustering geospatial data by features? Not in ArcGIS - rolling my own in a different framework. Example: I have some demographic dataset. Let's say this contains ...
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1answer
23 views

Statistical method to quantify the accuracy of point clusters

I have coordinates of about 13 points from different pictures in UTM. Per point I can have 2, 3, 4 or 5 coordinates of these points from 2, 3, 4 or 5 pictures. I would like to quantify the quality of ...
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24 views

Measure of “Matchingness”/Correlation between polylines [closed]

I am working with two layers of polylines that represent different modeled/representative approaches to summarizing aircraft radar tracks. I am curious if, beyond just visually inspecting them, if ...
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51 views

ArcMap - error 000728 field does not exist within table

I'm trying to join the table from Excel (my calculation about one region in Poland) to my shapefile (which contains whole Poland map and different calculations, so I need to attach a new table to be ...
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1answer
74 views

Writing a for loop in r to process multiple rasters with quantiles values

I am trying to get R to read a folder containing raster files, and then in a foor loop, extract quantile values from each of the raster to enventually process each raster with a substraction involving ...
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1answer
30 views

Missing data in SpatialPolygonDataFrames R: error in Moran.plot

I'm trying to use Moran.plot on a SpatialPolygonDataFrame (the world map from the rworldmap package) consisting of 234 elements in R. My database contains 81 countries, so there are 162 codes in the ...
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22 views

How to evaluate the statistic significance in the Neighbour Nearest Test?

I'm reviewing a scientific article to be publish. I tried to evidence that pathogens collected from different geographic areas clustered. I used Nearest Neighbour test to prove it. However, I've ...
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26 views

What is the difference between spatial heterogeneity and spatial nonstationarity?

Until recently I though both terms refer to the same concept. Most scientific literature seems to use these terms also interchangibly. However, here the authors say: Spatial heterogeneity refers ...
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1answer
56 views

Use of Getis Ord and Moran's I

I have dataset with around thousand geocoded datapoints, each having specific pollutant and its value assigned to it (so it is all in one dataset, some of the datapoints(stations collecting data) are ...
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2answers
120 views

How to obtain elevation differences between point and raster cell in R

I have an empty raster and point shapefile (points = black dots in the image). For the analysis I use a Digital Elevation Model (DEM) with the same extent and cell size as the empty raster. I would ...
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1answer
41 views

How to interpret spatial random permutations against the observed value of the statistic (PySAL)

I have a map for which I calculate the value of the Global Moran's I. With the use of PySAL, there is also an option to do a computational inference. The result of such analysis is shown below. From ...
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12 views

How do I summarize and analyze the attribute data for samples in a vector layer?

First of I am not well versed in GIS.I have a vector layer with biological data in the rows for microbial species. Every row has the species name of the microbe and then genomic data, GPS coordinates,...
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1answer
90 views

Statistic for measuring (local) autocorrelation of ordinal data

I have a spatial data set with a bunch of variables in nine-level ordinal scale. I want to calculate (local) spatial autocorrelation for each of these ordinal scale variables. I've been using ...
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1answer
34 views

Implementation of multiple-point statistics in GIS

Is there any implementation of multiple-point statistical algorithms in GIS? at least for spatial interpolation. code for instance.
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1answer
540 views

Average radius of city size?

Do any geographers on here have an estimate of the mean and median city radius sizes? I'm trying to optimize some Google Places API queries [e.g.] and this information would be helpful for that ...
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0answers
43 views

What is missing in my spatial lag equation model?

I worked it in GeoDa but I think something is missing. What is the right equation for a spatial lag model? In my understanding to predict a variable Y is as follows: Y = w_t_homi100 + CONSTANT + ...
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1answer
147 views

Calculating field AVG from B layer 3 nearest points to each A layer point

I wonder how to calculate statistics (in my case average) of one point layer field (let say B layer) and assign them to each point of A layer. Statistics should be calculated from 3 nearest B layer ...

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