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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17 views

Generating envelope for Gcross function in R?

I am using R to generate envelope for the Gcross function. At first I used Gcross to generate the theoretical value together with true G(r) value with border correction, my codes are: Bind_ppp <- ...
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12 views

Determine the appropriate window size to scale the original point pattern [on hold]

I am new to the spatial statistics using R. I have a large point pattern, and I would like to apply model fitting to the local point pattern instead of the whole pattern. To do so, I need to ...
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1answer
67 views

R (spatstat, sp, sf): Grid a single polygon, divide, alphanumeric labels based on column/row

I am trying to take a polygon and add grid lines over top, then divide the polygon into many polygons based on the grids. I've accomplished this through st_make_grid() and raster::intersect(). The ...
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1answer
54 views

GeoPandas: Get distance from geom in tableA to a geom in tableB that matches attribute from tableA

UPDATE WITH SOLUTION (at bottom) Using GeoPandas I am trying to identify the distance between an election candidate's home address (Point) and the electoral district they are running in (Polygon). ...
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40 views

Multiple Spatial Point Patterns, create “average” heatmap

I am using R's spatstat package to analyze spatial patterns of objects across plant leaves. Let's say I have 10 leaves, each with corresponding X,Y coordinates of the objects and a window in the ...
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1answer
21 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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41 views

A second opinion about Spatial Autocorrelation

I wanted to get an opinion on my results from spatial auto-correlation. Normally one would see an asymptotic trend after the 'still' in a spatial auto-correlation curve which would imply that the ...
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1answer
21 views

Apply function from rgeos package to data sets

I am using gDistance function from rgeos package to calculate the nearest distance from points to a polygon. Originally I used for loop to calculate the distance for each row in my points data set, ...
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1answer
28 views

Convert ppp object to multitpe object

I am working on spatial point pattern analysis using R. I have two sets of coordinates, both defined inside a 32*20 region. I first convert two data sets to ppp objects: Tumor_CD8 <- ppp(...
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25 views

Showing Statistics for Multiple Attribute using 'Show Statistical Summary' tool in QGIS

I need on the fly statistic as I select point on canvas. What the tool does though is give you the statistic and the given value for the Attribute selected. What if I need the value of multiples ...
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1answer
32 views

Extracting basic statistics (raster data) from different latitudes using R? [closed]

I want to extract the mean, min and max stats from latitude -50 to 0 and from 0 to 50 etc. No idea how to do this. I would prefer using R for this as I have a lot of these to do.
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28 views

Proportion of polygon classes in each multi-ring buffers

I have a landcover map with many irregular polygons, with each polygon a uniform habitat type. I have a second shapefile of points, and a third shapefile with multi-ring buffers around those points. I ...
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2answers
95 views

Calculate coverage percentage of an area covered by shapefiles using GDAL? [closed]

I have thousands of shapefiles covering around the world. I need to calculate coverage percentage. For example, a pixel located in Hawaii was covered by 100 of all shapefiles, then this pixel value of ...
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1answer
57 views

Spatial statistics within a polygon in Google Earth Engine

I am wondering if the information provided in this exchange is still accurate. number of pixels inside a polygon in Google Earth Engine I am trying to calculate mean precipitation within a river ...
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29 views

Spatial autocorrelation coefficients interpretations

I have this result for SDM estimates in R with R2 of 54%. Is the lambda (= -2.04) which is the spatial autocorrelation coefficient a plausible value? I have read in a book that [Elhorst, 2014, P.14], ...
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15 views

Compare two forest loss classifications and fill missing years: accuracy assesment or correlation?

I have a time series of forest loss rasters originating from two different classifications with some missing yearly data. Rasters represents forest loss (1) or no disturbance (0) in specific year. I ...
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1answer
84 views

Flow data distribution within features of overlapping layers

I want to improve/adjust/comprehend the formula (see below) that was used in my previous question: Transferring flows (connections + values) between polygons for calculating flow values of mobile data ...
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1answer
35 views

Point Feature Percentiles: National Rank vs Local Rank in ArcGIS

I have an idea in my head, but need assistance in how to process my data to get the answers I need. Restrictions: Where I work we use Esri products, and third-party packages and add-ins are ...
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18 views

Error: trying to get slot “polygons” from an object (class “data.frame”) that is not an S4 object

I am trying to join .csv file data to shape file data using @data slot. I am getting error "trying to get slot "polygons" from an object (class "data.frame") that is not an S4 object " Here is my ...
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48 views

Quantifying similarity between two independent areas?

I'm assessing areas for suitability for species relocations, so essentially I'm looking to quantify how similar a possible relocation site is to a source site in several metrics. The species may ...
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1answer
246 views

Hotspot analysis with geopandas? [closed]

Is it possible to perform a hotspot analysis (like the one you can do in ArcGIS - Getis-Ord Gi*) with Geopandas, or with any other Python library?
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48 views

Test the relationship between two point patterns

I have two point patterns obtained from medical images. Points are used to represent cell markers. By visualization, the point pattern A is extremely possible to be a subset of point pattern B. So is ...
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18 views

Determining spatial relationships between two non-homogenous spatial variables

I'm working on a problem to understand the relationship between two point-based datasets with different sampling patterns. We surveyed random subset of properties in a neighborhood for the presence ...
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1answer
79 views

Weighted mean of raster by polygons in R?

I have two rasters, raster_a and raster_b, and a shapefile, world_shapefile. Both rasters are of the world extent and overlay each other. What I want to do is to create a weighted average of raster_a,...
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54 views

Generating Pseudo-Absences in spatialEco?

I want to generate pseudo absences based on kernel density estimate from a linear feature spatial line layer, where pseudo absences have a higher probability of being sampled near a line. I have ...
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28 views

Raster statistics per latitude cross-section

I want a profile graph with biomass volume across a landscape's latitude. Im using ArcGis Pro 2.3.3. It's hard to explain so I'll provide a rough sketch of the desired result: The sketch shows a ...
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18 views

How long should a spatial mixed model with spaMM take?

I have a dataset that's about 5k lines long, with a binomial response variable, five continuous fixed effects, and one random effect with seven levels. I initially ran a model with glmer{lme4}: glmer....
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1answer
40 views

What does first requirement for LISA statistic mean?

According to Anselin, a LISA statistic have to satisfy two requirements: The LISA for each observation gives an indicator of the extent of significant spatial clustering of similar values around that ...
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1answer
45 views

What unit is returned by the ncf::correlog function?

I'm using the correlog function from the ncf package to figure out the distance between points at which spatial autocorrelation isn't detected. I was wondering what unit was being returned in the ...
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15 views

Comparing two spatial point processes (Cross K Function)

Suppose we have two spatial point process on the same space. One has $n_1$ points, the other $n_2$ points. I have been reading about statistically testing for independence, attraction or repulsion ...
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14 views

Simulating random field with power law distribution using ArcGIS Desktop?

As far as I know, there are a lot of methods developed for simulating 2D random field with Gaussian distribution, such as geostatistical method, Fourier transform, etc. But a lot of geoscientific ...
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37 views

Overcoming spatial bias in ArcMap or ArcGIS Pro?

I have a shapefile showing invasive plant locations but they mostly collected from more accessible places such as near roads or hiking trails. Is there a method to correct this bias in ArcGIS ...
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1answer
34 views

Counting the number of shared point within polygons [closed]

I have a set of points on a map, each with a unique location id, with one or more points within a number of polygons with unique polygon ids. I am trying to associate each location id with the number ...
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45 views

Raster correlation: Error (arg6) in raster.modified.ttest (R)

I am performing pairwise spatial correlation of 6 rasters using the raster.modified.ttest() function in R, as per this very useful post. I have consistently had the following error with my data; ...
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27 views

Extract random effects from CARBayes output

We conducted a study at the U.S. census tract level looking at the relationship between environmental factors and social mobility in the ten largest U.S. cities. We used CARBayes::S.CARmultilevel in R ...
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1answer
116 views

How do I plot spatialpolygon dataframe layer on a leaflet map

I am not sure why this piece of code works library(leaflet) library(raster) adm <- getData('GADM', country='SGP', level=1) popup <- paste0("<strong>Name: </strong>", ...
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71 views

BIOMOD2: error message: Error in .local(sp, env, …) : object 'mask.tmp' not found

I am trying to model a plant species (composed by 298 occurrences) with BIOMOD2 using the consensus landcover as explanatory variables. However, R shows me an error message during the formatting of ...
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1answer
66 views

Calculating Moran's I for buffers of forest cover?

I'm trying to figure out if buffers I have created in ArcMap (measuring percent forest cover in a 1 km distance from a land use map within the buffer) around points at which I will be collecting ...
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1answer
39 views

Extracting vector/raster data for CSV data points [closed]

I am using QGIS and I have a CSV file of lat and long coordinates which represents presence points of a species in the USA. I also have vector (the state extents/names) as well as raster information (...
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1answer
47 views

Seeking ArcGIS Pro tool to calculate network distance from point to nearest line?

I am trying to calculate the network distance from a point to the nearest poly line feature as pointed in the image below. Is there any ArcGIS Pro tool that can calculate network distance?
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24 views

Understanding Local Moran's I Maps?

I want to better understand the local Moran's I chloropleth maps which show areas (zones) as either in high-high, high-low or low-low clusters. As I assume the "high"/"low" is just relative to the ...
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85 views

Rank-based Spatial Clustering in Python

I was wondering if there was any python (or R) packages out there that can do spatial clustering on ranked data? For each US state I spatially varying value for education rankings. For example, for ...
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2answers
30 views

Specifying which point buffers fall within a particualar land type (polygon)

I have a point buffer layer which represents tick occurrence and a polygon layer which represents landcover types (derived from Corine land cover). I want to define which point buffers (1km) fall ...
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23 views

How to create a surface layer from gridded point data of air temperature and Precipitation?

I want to aggregate monthly averages of temperature and precipitation over a 10-year period into weighted seasonal averages (DJF) for use in interpolation. I have downloaded Shapefiles for each month (...
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1answer
56 views

Measure distance for spatialLine in R returns bad value

I have this spatialLine in R: library(sp) library(maptools) library(SDraw) library(leaflet) x <- c(153.9, 152.67072,147.9879,144.25364,135.45557,116.03998,76.92708,45.10622,37.02522,36.76888,36....
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24 views

Using spatial clustering or statistical tools for attribute data

I have a data-set of well test results with attributes like iron and manganese concentrations. What are the best tools to try and determine if there are any spatial trends for each attribute? I would ...
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1answer
187 views

Plot trajectory in R

Does anyone knows a library/technique in R where you can plot a trajectory using multiple timesteps (points) where each point does have a lat/lon coordinate? I have this data x <- read.table("...
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0answers
8 views

Adding output value to attribute table of a feature class in model builder (ArcGIS 10.4)

I was doing spatial autocorrelation analysis in ArcGIS 10.4. So is there any way by which I can input the obtained Moran's index value in attribute table of other feature class if the objectID is ...
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1answer
53 views

Seeking ArcGIS TREND tool equivalent in R?

Arc features the TREND function with linear interpolation up to 12th order. Is there an equivalent approach in R (preferably) or python? I'm trying to de-trend a raster surface using polynomial ...
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0answers
56 views

Geographic scale of model and covariate significance using ArcGIS Spatial Analyst and R?

A few months back I created a spatial logistic regression model of terrestrial skunk rabies in Arizona/Colorado/New Mexico/Utah. A link to the project can be found here (https://docs.wixstatic.com/ugd/...