Questions tagged [statistics]

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

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2answers
107 views

Getting statistics in cross sections at varying heights in LAS files?

I am looking to cross section my forest at varying heights. I have high return LAS data (8 points/m2 and average point spacing of 0.2m) and I am looking to do more than the simple 1, 2, 3 approach of ...
3
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1answer
79 views

Missing 0 values of a Rasterlayer prevent correct calculation with Zonal Statistics tool in Qgis

For my master thesis I want to calculate the mean percentage of sealed surface in some parks of Berlin. For this purpose I have a rasterlayer containing this data. In a previous step I already ...
0
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1answer
108 views

Calculate mean and std for 1 field in feature class Table (ArcGIS 10.4, arcpy)

I would like to calculate a mean and STD for one field in my feature class. I am python beginner. I have found great source calcualting mean and STD for multiple fields, however, the STD calculation ...
3
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3answers
2k views

What is the equivalent of summarize field in QGIS

In ArcMap, user can create a table that groups the field values using summarize field tool (as shown below) How can I create a table that summarizes field values in QGIS?
2
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2answers
1k views

Statistical comparison between different rasters using R?

I need to compare, statistically, different rasters with a pattern raster (in this case a Revised Universal Soil Loss Equation (RUSLE) raster). I used different methods to calculate the environment ...
1
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2answers
32 views

Calculate the mean for all the attributes of a zipcode? [closed]

I have a spreadsheet with two columns: Zipcode and Housing Price. Is it possible to calculate the average Housing Price per zipcode without manually using Excel commands per zip code?
2
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0answers
36 views

How to do power law test for DMSP/OLS nighttime Satellite data [closed]

I am working with DMSP/OLS satellite's (6 bit) nighttime light data to study the urban expansion of different cities in South Asia. I could not understand the Power law distribution method. I searched ...
1
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1answer
411 views

Map statistical significance in the difference of two raster maps

I have two raster maps that are the output of the same model (they describe the same variable) but ran with different parameters and I would like to assess if there is a statistically significance ...
4
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4answers
504 views

Populating polygon with most frequent point attribute using QGIS?

What I have is two features, a polygon showing wards, and a point shapefile showing properties which has an attribute detailing the type of consumer within the household, such as country living, urban ...
1
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1answer
176 views

Statistically comparing two spatially congruent continuous rasters?

First: Rasters are the same spatial resolution & extent and contain the same kind of information. Each pixel contains a probability value from 0-1. Sounds simple to compare. Conventional wisdom ...
0
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1answer
58 views

point count from in Inverse Distance weighting procedure - QGIS

I have conducted an interpolation using IDW procedure. I have vectorized the interpolation in order to be able to specify a 3 class clasification. I have additional point dataset indicating the ...
3
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1answer
237 views

Using arcpy.Statistics_analysis

I know that arcpy.Statistics_analysis is able to calculate the sum of Float fields. Now I have a gdb named yyy.gdb that contains a feature class named abc like this: where: abc contains 3 fields A,...
5
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1answer
130 views

Where is the “input point vector layer attribute” in the “Count Points in Polygon” in QGIS 2.18.9?

In older QGIS versions the Count Points in Polygon vector analysis tool had an "input vector layer attribute to aggregate" to perform a statistical analysis (sum, mean, min, max) on the counted points ...
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0answers
110 views

Comparing feature values between spatial points (same locations and variables - different surveys)

How can one (statistically) compare the feature values of one set of points against the feature values of a different set of points (within the same spatial extent)? I am aware of methods of ...
2
votes
2answers
387 views

How to view “quick” statistics for a table in ArcGIS Pro

In ArcMap i can view statistics describing the values in numeric columns of the attribute table by right-clicking the field name and then click Statistics: I cant find statistics like this in ArcGIS ...
2
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0answers
204 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 ...
1
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2answers
188 views

qgis2threejs height of cylinder based on column value

What i have: A csv file with coordinates (RT90) A Elevation layer What i want to do: In the csv I have some costs and I want the 3D cylinder to represent the costs. Higher cost=Higher cylinder ...
4
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1answer
877 views

Creating histogram for slope raster in QGIS?

I am looking at landslide distribution and I am wanting to look at the distribution of landslides on different slopes. Ideally, I am wanting to create a graph that displays the slope distribution for ...
2
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0answers
53 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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2answers
82 views

Finding total area and percentage of specific color band value from Orthomosaic?

I want to get statistics for a color band within an orthomosaic. Specifically I want to know what area or percentage area of the raster is above a particular value.i.e. band 2 > 60. I'd like to know ...
2
votes
1answer
133 views

Mode (Statistics) on mapping

I have a city map with digital boundaries. Each polygon has some numbers between 1 to 7. For example one of the polygon has 4,4,6,1,4,7,3,4,5,4,2 (the mode is 4 for this polygon). I wonder is there a ...
0
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1answer
31 views

How can I resample statistics from one set of districts to another?

I have statistical data for a certain region based on a subdivision of that region into districts (e.g. number of schools per district). Now I want to resample that data to a different subdivision of ...
0
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1answer
154 views

How to test for the difference in the statistical distribution of raster values in different zones?

I have a continuous raster that has been divided in 8 zones, and I'd like to compare if the distribution of pixel values in each zone is significantly different from each other. I thought I would use ...
3
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1answer
60 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 ...
0
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1answer
95 views

Analyzing spatial pattern in time using ArcMap?

I am analyzing a dispersion of unemployement rate at municipality level in Czechia between 2002 and 2016. I have chosen LISA analysis which identifies high-high and low-low clusters. Now I would ...
0
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1answer
194 views

Getting Negative values in Regression based Biomass model!

I am using Multi Linear Regression (stepwise method) to estimate above ground biomass. Different spectral indices and other variables mostly derived from Landsat 8 OLI are used to check potential ...
1
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1answer
1k views

Getting multiband raster's min and max values with Python in QGIS?

Is there anyway to have access to minimum and maximum pixel values from multi-band raster using Python in QGIS? This is QGIS and I loaded 3 different bands as rasters. If there's a way to have access ...
1
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0answers
35 views

Selecting max values from list of raster layer and attaching raster source of max value using ArcGIS Desktop? [duplicate]

I have three raster layers (a,b,c) and I am wondering if I can extract the maximum values AND attach the limiting raster(s) that contribute to the maximum value as illustrated. What I can do so far is ...
1
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0answers
62 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....
-2
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1answer
692 views

Calculating mean of raster layers in ArcMap

I used cell statistics in ArcMap to produce mean raster file out of 6 rasters but cloud and no data areas is obvious in result. How can I homogenize my raster?
0
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1answer
99 views

arcp.Statistics_analysis error 000800

I'm trying to use arcpy.Statistics_analysis using a feature layer as the input and a long int field ("MaxOID5" for the field summary so I can get the max value. arcpy.env.workspace = r"C:\data\mydata....
0
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1answer
142 views

ArcGIS Server - statistics report is empty

Services on our DEV server are slow and I would like to figure out why using the statistics reports in ArcGIS Server Manager. But the reports I see are empty, unlike those in our TEST, ACC and PROD ...
5
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1answer
121 views

Calculating Statistics Based on Expression in QGIS?

Is it possible to calculate the sum of polygon areas based on whether or not it has a value in another column? For example: In column 2 I have the area of polygons. I want to calculate the area of ...
3
votes
2answers
457 views

Getting the maximum value of a vector field per each unique value of another vector field using PyQGIS?

I have a vector layer with two columns: Code (string) and Area (float/double). The column Code includes some repeated values. I'd like to evaluate for each unique value of Code the maximum value of ...
3
votes
1answer
370 views

Export Raster Information to Excel for statistical analysis

I want to make some statistical analyses on a raster. For this I do not need the spatial information. I just need to have a list with every cell value that I can open in Excel. I tried exporting my ...
4
votes
1answer
262 views

QGIS: Displaying total length of lines in print composer legend

In the print composer (also in the layer selector) I can choose to automatically display the amount of objects in that category in square brackets. That is useful for point features/layers. But in the ...
1
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0answers
28 views

Statistics in properties different from statistics in attribute table (Arc) [duplicate]

I have generic signed integer raster downloaded from the ORNL DAAC. https://daac.ornl.gov/NACP/guides/NBCD_2000.html It is a single band raster. I looked at the statistics in the properties of the ...
1
vote
1answer
264 views

How do I calculate area error probability of a polygon with knowledge of point errors

I have a polygon, representing a glacier, which is defined by over 3000 points. This polygon is digitised from an accurate orthophoto. I also have a polygon of said glacier digitised from Landsat. In ...
2
votes
1answer
78 views

How many random points are needed to statistically describe a DEM?

I'm running some statistical comparisons between several DEMs (SRTM, ASTER, ALOS...) through GRASS-GIS and Python. Dealing with millions of cells is not very practical, so I thought I could compare ...
1
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0answers
58 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 ...
1
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1answer
116 views

Exporting Statistics tab in MapInfo

I'm trying to calculate the average house price within different sized buffers using MapInfo. I have thousands of properties on my map as points (in one layer) and around 60 different sized buffers. ...
1
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0answers
2k 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] ...
1
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0answers
58 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 ...
12
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1answer
2k views

Plotting bar charts on maps in R?

I'm using plotrix in R to plot a state level map of the US. It has an excellent function floating.pie to put pie charts on each state. I'm wondering if there are similar functions within the plotrix ...
0
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1answer
23 views

Define location and name of cell statistics output

I have a list containing 3 rasters. Running the cell statistics operation on this results in a raster in the default database. My work involves getting the numbers in the count column. I don't want to ...
2
votes
0answers
55 views

select 8 rows in the table and calculate statistics for them, then select next 8 in the same table and calculate statistics for them [closed]

I have a large table which structure looks like that: This is just to show you what I want to achieve, because my original table has nearly 1 million records. Now imagine that I have temperature ...
1
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2answers
2k views

Calculate raster statistics per polygon in a polygon feature class

I have a raster layer representing land cover which has three categories of pixels: natural, semi-transformed and transformed. I have a polygon feature class where each polygon delineates a ...
0
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1answer
93 views

Geonetwork catalog dataset statistics

I want to get some statistics about my geonetwork catalog. Things I would like to know are total dataset count dataset count for different format types (e.g. CSV, WMS, etc.) dataset count that is ...
2
votes
1answer
165 views

How to Track Individual Layer Usage Within Map Service?

I have a public-facing web mapping application (flex-based), and I need to get the usage/statistics on the layers that people are using, however, a lot of these layers are one of many within a map ...
3
votes
2answers
1k views

How to create Raster statistics with GDAL externally?

If I want to create a GDAL PAM statistics file with the command gdalinfo -stats from a GRIB file, e.g. needed for DynamicColorMapping, GDAL only creates the statistics internally inside the sourcefile....