Questions tagged [statistics]

Collecting and analyzing numerical data or making numerical summaries of data.

56 questions with no upvoted or accepted answers
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162 views

Web mapping API popularity

Are there any online statistics for the popularity/usage of web mapping APIs? A diagram would be sufficient, if it can be published in a paper. I have only found one source: https://trends.builtwith....
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1answer
69 views

Assigning points which are very close to the boundary when polygons share boundaries?

For traffic crashes, the data points are mostly mapped on roadways. Meanwhile, Census uses roadways (centerlines) as boundary for geographic areas like ZIP Code Tabulation Areas (ZCTAs). I'm trying ...
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40 views

Finding closest anticorrelated polygon or automate what is learned in semivariogram?

I am trying to do spatial autocorrelation of sorts based on a layer of polygons of mean rainfall data. I want to see how rainfall deviates from a certain point on the landscape. Essentially, I want to ...
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422 views

Why are my raster mean and standard deviation -1?

I have a set of about 25 rasters whose descriptive statistics I have been examining. The data in the rasters were calculated in Python and the rasters were created using Python-GDAL. In all but one ...
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21 views

Getting TIN Statistics in ArcGIS Pro with 3D Analyst

I'm trying to get basic descriptive statistics from a TIN layer (MIN, MAX, MEAN, STD) to compare it to IDW interpolation data of the same study area, but can't seem to figure out how to retrieve ...
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54 views

Calculating share of overlapping areas via aggregate function in a virtual field

I'm trying to calculate the shared area for several overlapping areas. I need a dynamic solution in order to get automatically calculated statistics when drawing new polygons. The target area is in ...
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0answers
228 views

Computing stats with data ignore values - ENVI classic

I'm using ENVI classic (5.4.1) and trying to compute basic statistics from a Landsat-8 scene. When I mask out certain pixels (water set to 'No Data', for instance) the built-in ENVI statistics still ...
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60 views

One-dimensional data in spatstat

I have data of one-dimensional points (locations in a straight line). I want to check if the cluster poisson process models or Cox models are a good fit for the data. Since my data only has x-...
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52 views

Aggregating census tracts and reducing Coefficients of Variation?

I am working on a project that maps out poverty rates (ACS data) by census tract. Many of the tracts have CV's that are just too high for our study and I am hoping for find a sound methodology in ...
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0answers
39 views

Basic statistics function on certain attributes stops at 6% on certain layer in QGIS?

I am trying to use the basic statistics function in QGIS on an attribute in a vector shapefile but it reaches 6% and then gets stuck and does not load anymore. It works fine on other layers/other ...
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180 views

Zonal statistics error: 0-d arrays can't be indexed

How can I fix the error 0-d arrays can't be indexed? This message appears after the tentative to use the algorithm Qgis Zonal Statistics. Detail: the algorithm worked very well several times and then ...
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403 views

Bivariate Mapping (running a single variable regression and mapping r-squared value)

I am hoping to produce a bivariate map displaying the correlation between two variables (specifically percent SNAP participation by county against several social variables). I would like to produce ...
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106 views

Joining two fields after calculating?

I have been working with two layers and I am trying to join them and turn them into a raster data. The first layer is a watershed layer which I have assigned each shed a location from the center point ...
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703 views

How do I create a leader line for a label in my bar graph in ArcMap?

I am displaying a bar graph of various tornado watches and warnings along with the actual tornado touchdowns themselves. Since the tornado touchdowns are such a small number compared to the large ...
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1answer
44 views

How can you use scikit-learn to do PCA on a 9 band raster image?

I would like to do a PCA on a 9band raster image to reduce the total number of inputs bands to 3. However, I'm not able to do it as I don't think I understand what sklearn is doing in its PCA. Some ...
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16 views

Calculating Nth percentile from table in ModelBuilder of ArcMap

I am trying to build a complex tool, using ModelBuilder and I am new at this. I have two feature classes full of polygons. The first contains 1300 polygons, dividing a city in zones (ex: residential, ...
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12 views

How to calculate line raster intersection statistics in ArcGIS Pro

Years ago, I lived by Hawth's Analysis Tools for spatial ecology. Since then I've been having to figure out how to duplicate the functions in ArcGIS 10.x and now ArcGIS Pro 2.5.0. In this case I am ...
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37 views

Count of majority value for each cell?

I ran 10 classifications (Random Trees) in ArcMap. Each time the output will be somewhat different. I have made a final map based on the majority value of each pixel using cell statistics (majority). ...
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30 views

Summing Attributes based on ID Field using ArcGIS Desktop?

I'm trying to sum attributes based on if their ID matches the ID of other attributes in the feature class. To explain further, each road has it's own Replacement Cost and Section Number as well as a ...
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41 views

Discrepancy in values between Summed Line Lengths and Clip in QGIS

I have a polygon vector layer containing four polygons, corresponding to four Protected Areas in a state in India. a line vector corresponding to all the rivers in that state. Desired output: I want ...
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217 views

Reprojecting raster using QGIS?

I'm currently working on MODIS satellite product "MOD16A2" which provides regular 500m's resolution pixel of evapotranspiration. I basically need to extract from the map the mean value of different ...
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66 views

arcpy.Statistics_analysis for multivalue parameter

I made this script to calculate the sum for a selected field after a query definition is defined. I have some issues now, to do with a multivalue field. The code is: import arcpy Layer1 = arcpy....
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60 views

Raster multivariate regression

I am looking for advice on how to set up a multivariate regression using raster data. My dependent variable is the location of firms in a specific industry. My independent variables are: lease rates ...
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3k views

Trying to link ZIP code to core-based statistical area

I have a dataset downloaded from the IRS reporting AGI by ZIP code (link: irs.gov). However, I'm interested in tying each ZIP code to statistical areas (whether it's [a] primary statistical area, [b] ...
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60 views

Two different outputs form QGIS basic statistics

I have two separate line layers, each with a length attribute column. When I compute basic statistics on the first layer's column, it works as expected, producing Mean, StdDev, and so on : But ...
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269 views

Summary statistics from feature iterator and select by location - missing selected feature name. Arcmap 10.2

I'm trying to calculate summary statistics for a subset of a point feature, based on selecting by location. I'm using a feature selection iterator to get statistics for each polygon feature in the '...
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132 views

Per-pixel Descriptive Statistics through multiple Raster layers

I'm looking for computing different descriptive statistics through a set of raster layers. I need to make it with a python script capable of running into a standalone tool within the QGIS. To do so ...
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301 views

Explaining different results from Ordinary Kriging and Universal Kriging?

When using either methods to create a surface from the same set of observations, these surfaces differ from each other. Visually it can be seen in the differences of the following contours (...
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39 views

Statistical bias arising out of only comparing US census block groups that have not changed (been split) over time?

Census Block Group ("CBG") study areas are notorious for changing over time. Even from 2009 to 2013, about 10-25% of the CBG's in South Carolina have not remained consistent over that time. Seeing ...
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121 views

Raster Area within a Polygon

using ArcGIS, I have a layer of overlapping polygons and a raster grid underneath. The raster is not a continuous grid - the cells are spread out. I simply need to calculate the total area of the ...
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732 views

Invalid drop item: Calculate statistics

I have a number of rasters that I need to calculate histograms for. These are continuous rasters from 0 to 294.208 - many decimal places. I need to be able to classify the histogram down to at least ...
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388 views

Road traffic database sample?

I would like to do some experiments on a traffic forecasting neural network and I need some real traffic data to run the network. My question is where can I download some real traffic statistics data ...
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37 views

Metrics of change between vector datasets

I have an old and a new set of parcel data which I'm looking to compare. I'm looking to compare changes in individual parcel geometries, so boundary/corner adjustment. Currently each parcel we have ...
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99 views

Plotting N-S and E-W Profile of Land Surface Temperature (LST) Across Land Use types in ArcGIS for Desktop?

I am working on my final year thesis and I need to plot the seasonal North-South and East-West profile of land surface temperature (LST) across various land use types. I have been able to extract ...
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0answers
269 views

How to export raster into ascii without losing the statistics?

I had a problem in Mike Urban with a difference between a DEM (Digital Elevation Model) and a 2D overflood model and the support group requested me to remove the difference because the problems were ...
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262 views

Mann-Whitney U test for rasters

I'm doing a Mann-Whitney U test to compare two very large samples (sample size 1 = 13250; samlple size 2 = 38871) originating from a shapefile with 52121 features. I know t-tests are not recommended ...
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426 views

Reshape Matrix and perform Zonal Statistics in Matlab

I have 2 grids: 1) n by m - at 100m 2) n*10 by m *10 - at 10m. These grids cover the same area. I have to perform zonal statistics at scale of grid no.2. Cell value of grid no.1 is cumulative for ...
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765 views

QGis Grid statistics for polygons error - Module caused access violation!

I'm trying to calculate statistics for a raster layer using an overlaying polygon layer, I'm using SAGA "Grid Statistics for polygons" function, but it returns an error, sadly.. So in the sextante log ...
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1answer
2k views

Extract values from raster by using polygons

I am working with multiple raster files that cover all of united states. The file format of the rasters - GeoTIFF. I have around 100 geotiffs that I need to process. Then I have another shapefile with ...
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14 views

How to find all cells within a neighborhood with slopes towards the center?

I would like to iteratively go through each cell in a raster in arcGIS that meets criteria (already established as per below description) and find the percentage of cells in a several km neighborhood ...
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27 views

Calculating rates and classifying polygons with specific values using ArcGIS Pro

I am still relatively new to GIS, especially ArcGIS Pro. I am working on a project where I am trying to find the rate of car crashes along major roads in different census blockgroups. In this ...
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19 views

Does GWR only work with point data?

I'm currently working on a dataset where observations are only given very general location information, eg. counties they are in, the whole dataset is on country level scale. I used OLS to analyze and ...
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0answers
15 views

Nan values when classifying with Natural Breaks (Jenks)

When using the Natural Breaks classification mode, "nan values" often appear in the classes (see picture below). The nan values may disappear when I change the number of classes back and forth, but ...
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23 views

Summary Statistics with non-unique Case Field

Is there an elegant way to run summary statistics and only keep a field if it matches the statistical test? For example, I have some points, and distances from these points to several polygons. I run ...
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136 views

Converting distance from km to degrees (WGS84)?

Is there an equation in which I can convert distance in kilometers into degrees? I am performing a Kriging analysis and when I am measuring the distance between the input points (for LAG and Major ...
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0answers
57 views

Image Statistics Import in Google Earth Engine?

I've wrote this code for Nitrogen Index. but it returns error. how can I solved this? code link: https://code.earthengine.google.com/ff6954984a933d11580d2717ba59670e error massage: Layer 2: Layer ...
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2answers
38 views

Standard deviation or standard error, which is right to present along with average as error bar?

I have monthly sea surface temperature data set for 1 year. I need to present seasonal average as bar chart and error bar to show deviation in each season. for example, season 1 = nov+dec+jan+feb/4 ...
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29 views

Statistic validation for spectral trajectories/trend from ground truth dataset

I'm doing an extraction of spectral trajectories for disturbed forest pixels using multitemporal (single scene for 20 years) Landsat Surface Reflectance products. Usually, forest disturbances are ...
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25 views

ERROR in R - it cannot support the vector

I did use the function crop and mean for 434 rasters in Rstudio. Each one is very big, it corresponds almost like 1/4 of Brazil. Now I want to calculate the standard deviation between these 434 ...
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100 views

Calculate Bare Soil Line Intercept using R

I am using an R package called BSL (Bare soil line), package is at https://rdrr.io/cran/landsat/man/BSL.html. The BSL package uses R's lmodel2 function (https://cran.r-project.org/web/packages/lmodel2/...