Questions tagged [statistics]
Collecting and analyzing numerical data or making numerical summaries of data.
4
votes
1answer
23 views
Using lidR to count number of pulse returns at different intervals?
I am trying to get the number of pulse at different height interval.
I have used the lidR package to do this before with the code below but it seems that recent update in the package breaks my code. ...
2
votes
1answer
50 views
Zonal statistics basic output
I have been using the zonal statistics tool to quantify the variability of slopes around archaeological sites.
I have noticed in some experiments that there are differences between the mean and the ...
0
votes
2answers
25 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
...
0
votes
0answers
10 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 ...
0
votes
1answer
29 views
Create mean raster stack from raster stack
I am trying to create a mean stack image(1 panchromatic layer) from a stacked tiff image(13 panchromatic layers). How do i go about doing this?
My code:
from osgeo import gdal
import numpy as np
#...
2
votes
1answer
43 views
Calculating Length of Lines within polygon (buffered area) using QGIS?
I created a buffer around points and then merged these buffers to eliminate overlaps. Now I want to calculate the exact length of tracks within this area. It might be the case that at some points the ...
0
votes
0answers
11 views
Why the Masking in ENVI does not give different statistical result
I want to run statistical band correlation of an image in ENVI. The image has been masked with polygon of interest, and shows no-data value outside the polygon. I expected that it calculated only the ...
1
vote
0answers
19 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 ...
2
votes
0answers
44 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 ...
0
votes
0answers
12 views
QGIS Group Stats - no option to add columns showing “first” value
I have a bunch of lines that have a phase name, and then a type. So like "Phase 1" and "12in Water". I have many phases and types in this dataset, and want to list the items in each phase, and the ...
1
vote
2answers
31 views
Calculate raster statistics for polygons in a polygon feature class
I have a DEM across my study area where symbology has been changed to show elevation changes in 100m intervals.
I have a polygon feature class where each polygon delineates a landslide.
My landslide ...
1
vote
1answer
29 views
Calculating incoming net radiation using Google Earth Engine?
I am a beginner with GEE and I am trying to calculate the incoming net radiation for that I need the square inverse of relative earth sun distance using the expression dr = 1 + 0.033*cos(J*2*pi/365) ...
0
votes
0answers
23 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 ...
0
votes
1answer
31 views
Counting attribute value based on location using ArcGIS Pro?
I have a school district polygon divided up by neighborhood, and I am trying to determine the number of students from each grade per neighborhood. The student point file contains an attribute with ...
1
vote
2answers
69 views
Calculate the percentage of a Line passing through Polygons
I have a polygon layer of a region (100% coverage, no overlaps) and a line layer in the same region.
I want to calculate for each line to which percentage it crosses certain polygons.
I have seen ...
1
vote
1answer
40 views
Classifying fields and getting statistics in ArcMap? [duplicate]
I am using ArcMap 10.6.
I have a table with country data. I am interested in Asia only, so I created a new layer (and shapefile). Several countries have missing data, which was filled with the same ...
0
votes
1answer
27 views
Comparing multiple means in ArcMap?
I have two fields of LU_Name and BETW.
Is there any tool which compares the means of BETW in different groups based on the LU_Name nominal field and reports their significant correlation?
0
votes
0answers
18 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 ...
0
votes
1answer
45 views
Maximum Value Within Area
I have a large set of points and need to determine the individual point with the maximum value for a given attribute within 12 km quadrants and extract these to a separate shp. Currently, I have ...
-3
votes
2answers
32 views
Get stats from a shape inside another shape
I have a big shapefile with many features.
Then I have a another shape of less size, wich is in the same space that the first shape.
I need to get stats (area, %) from the first shape that only match ...
0
votes
0answers
53 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/...
1
vote
1answer
79 views
Using Statistics by category in QGIS?
I use the "statistics by category" tool from QGIS to learn what grain yields I got from different combinations of scenarios like:
Soil A + Hybrid A + Planting Date A = Yield n
Soil B + Hybrid A + ...
0
votes
0answers
37 views
R circular statistics on a raster time series
I have a raster time-series with values from 1 to 36 representing 10 days (dekads) timesteps and NA values.
I need to calculate the average and the standard deviation, taking into account that ...
-1
votes
1answer
47 views
Sum attributes of feature that occurs multiple times within a layer
I am trying to add up the total contributing drainage area of multiple stormwater BMP's that are located on the same parcel for a layer that contains tens of thousands of parcels. I performed a one-to-...
1
vote
1answer
131 views
Differences between Operations Dashboard for ArcGIS and Power BI? [closed]
We are looking for a possibilty to show some live statistics and calculation over geodata (the developement on some retail markets ) and want to see what is suitable. I have tried Power BI and have ...
0
votes
0answers
21 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-...
0
votes
0answers
40 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, ...
1
vote
1answer
102 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 ...
2
votes
1answer
172 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
vote
0answers
36 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
vote
1answer
156 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 ...
0
votes
1answer
169 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
50 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
votes
1answer
50 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 ...
1
vote
1answer
161 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?
0
votes
0answers
57 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
vote
0answers
84 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 ...
-5
votes
1answer
96 views
2
votes
1answer
185 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 ...
0
votes
0answers
29 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....
1
vote
1answer
106 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 ...
0
votes
1answer
209 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
votes
0answers
126 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
234 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
vote
0answers
179 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
87 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....
1
vote
2answers
92 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
votes
1answer
64 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
votes
1answer
93 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
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?
