Questions tagged [statistics]
Collecting and analyzing numerical data or making numerical summaries of data.
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6 views
Are there absolute minimum or maximum values for Sentinel-1 GRD images?
Sentinel satellite imagery has become a standard product for operational Earth observation. For the SAR case, this holds for Sentinel-1 ground-range-detected (GRD) imagery, in particular when terrain-...
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0answers
17 views
Parameters for BSL Package in R
I am using the landsat BSL (Bare Soil Line) package from R https://rdrr.io/cran/landsat/man/BSL.html, and I am wondering why the code sample is using llimit 0.005 and not 0.01:
BSL(band3, band4, ...
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0answers
40 views
Using statistics of entire raster band as variable or constant in QGIS raster calculator
I would like to automate the calculation of vegetation indices like the Excess Green Index from RGB orthomosaics that are 1.5-4gb in size. The ExG requires simple pre-processing to do. The steps are:
...
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1answer
46 views
Calculating Bare Soil Line using R?
I am using a package in R called BSL (Bare soil line), package is at https://rdrr.io/cran/landsat/man/BSL.html. I've used it successfully to run regression line for my soil study area but it is ...
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0answers
11 views
How extract image collection statistics with image image.reduceRegion in Google Earth Engine? [duplicate]
I am gonna to know that, how can I extract min and max of each image in this code? could everyone help me, please?
var modis = ee.ImageCollection("MODIS/006/MOD13Q1")
.filterBounds(geometry)
....
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1answer
34 views
Image Collection Statistics in Google Earth Engine?
How can I extarct mean of each image collection in google earth engine?
for example for this code:
var modis = ee.ImageCollection("MODIS/006/MOD13Q1")
.filterBounds(geometry)
.filterDate("2000-01-01",...
1
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0answers
30 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 ...
1
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1answer
37 views
QGIS find overall min/max
I have a variety of raster files from the exact same study area including different values (hourly mean radiant temperature). Is it possible to find out the overall min/max values (not each individual ...
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1answer
33 views
How to calculate the Min & Max value for a pixel from multiple Raster Images?
I have downloaded a Bunch of MODIS MOD13Q1.006 Images for my Study Area, covering a period of 4 years (same scene across time).
Now I want to calculate the Min & Max NDVI value for each Pixel, so ...
2
votes
1answer
46 views
Group multiple lines of data by country
I'm a novice with Carto and GIS generally. I have a data table with a few thousand lines of data. Each row of data has a country and a numerical value.
I'm trying to total the value by country ...
0
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1answer
22 views
ArcPy SummarizeWithin not availabe in ArcMap with Advanced license?
When running "arcpy.SummarizeWithin_analysis()" in PyCharm, I get an error saying the module isn't available. I've done "import arcpy" and I have ArcGIS Desktop 10.6 Advanced. It also doesn't show up ...
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0answers
69 views
Results of geometric intervals for data classifications don't make any sense
I am experimenting with different methods/algorithms to classify data and code them in Python - as QGIS has limited color classification methods. I have been struggling with geometric progression a ...
1
vote
1answer
66 views
What does percentile mean in simpleComposite of Google Earth Engine?
I was using 'ee.Algorithms.Landsat.simpleComposite' to composite images, but I'm not sure what does this 'percentile' parameter mean?
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0answers
35 views
Statistical analysis of polygons QGIS : find areas of statistical difference
I have polygons for the country divided into E.D. areas.
These polygons illustrate the average annual rainfall in their ED area.
Is there any way to statistically tell if one polygon area has a ...
1
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0answers
65 views
Choosing statistical method for determining different crop types? [closed]
Task: Determining different crop types from satellite imagery.
Tools at hand
Training data set which includes RGB, longitude and latitude, NDVI
and crop type for each pixel (10m by 10m)
Test data ...
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1answer
56 views
2
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1answer
127 views
What is a relevant geospatial modelling approach when no spatial autocorrelation is found?
Although I have found on StackOverflow all answers I ever had on GIS matters using R, ArcGIS and QGIS in the past, I am currently faced with one question I can't find an answer to online.
For my ...
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0answers
21 views
Class Statistics in eCognition
I have created three thematic classes using eCognition. I created these classes from a multiband raster with 5 bands.
Class 1 was created to include all values between value x and value y in band 1....
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1answer
56 views
correlation matrix and p-value in grass
I'd like to know if there is a way to obtain statistical significance and p-value for correlation coefficients calculated for different raster in grass with the command r.covar
All that I obtain is ...
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1answer
94 views
Getting image band statistics in Google Earth Engine code
What is the command to get the band statistics (min/max/etc.) for an image? I know I can do it for a region (using image.reduceRegion) but I want to have it for the whole image without defining a ...
3
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0answers
86 views
Performing multiple regression of time series data using R? [closed]
I am working with MODIS time series data, and I want to stack a stack object to prepare my data for multiple regression.
I have AMSR (soil moisture) as a response variable and I have some ...
1
vote
0answers
157 views
mclmcrrt78.dll error while calculating statistics for transects of shorelines [closed]
For analyzing the rate of change of shoreline over the period of 20 years, I installed DSAS version 4 extension to ArcGIS 10.4.
While calculating the statistics, the DSAStool calculated the intersect ...
1
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0answers
155 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 ...
2
votes
3answers
63 views
FME statistics on Tester Conditions
I'm using FME to look at a large directory and filter down through many factors to handle the data within the directory.
One of the stages I am working on is to search for companies that own the data....
3
votes
1answer
50 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
60 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
votes
3answers
885 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
718 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
vote
2answers
30 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
32 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
vote
1answer
273 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 ...
3
votes
4answers
353 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
vote
1answer
119 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 ...
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1answer
44 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
votes
1answer
80 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
votes
1answer
101 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
93 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
1answer
156 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
votes
0answers
172 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
vote
2answers
125 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
...
3
votes
1answer
411 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
votes
0answers
43 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-...
-2
votes
2answers
57 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
117 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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0answers
45 views
Establishing statistical associations between raster data in R?
Is it possible to establish statistical associations or relationships between raster data in R?
I have created two interpolated surfaces independently using a spatial binomial logistic regression ...
0
votes
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 ...
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1answer
103 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
votes
1answer
36 views
When polygons share boundaries, how to assign points which are very close to the boundary?
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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1answer
70 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
votes
1answer
139 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 ...
