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Questions tagged [statistics]

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

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3 votes
1 answer
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Missing values (NULL) handling in QGIS Statistics Panel

The handy Statistics Panel in QGIS 3.34.3-Prizren (accessible from the summation button) does not seem to recognize NULL values. I have a layer with about 10% NULL values but the Statistics Panel ...
john coleman's user avatar
0 votes
0 answers
33 views

GeoServer WPS RasterZonalStatistics missing out pixels

I am trying to get stats back on a raster for a given polygon. The raster is a 0.5 degree grid with each pixel having a numeric value The location of a point is determined by the top left corner in ...
user238743's user avatar
0 votes
0 answers
19 views

Spatial relationship between fast ice and frazil ice using heat maps

I used Google Earth Engine to create heat maps for both frazil ice frequency and fast ice frequency. This was done by classifying these ice types from MODIS images along the Victoria Land Coast in ...
Daniel's user avatar
  • 1
1 vote
1 answer
56 views

Make statistical expression for field calculator

I have a vector layer called 'Stations' and a table called 'Attitude' and a relation exists between the table's ('Attitude') "Staion_id" field and vector layer's ('Stations') "uuid"...
Redowan Sakib's user avatar
1 vote
1 answer
105 views

Find coordinates corresponding to max and min values using Python

I'm using GDAL and numpy so far in my Python program. I am able to get the max and min values of a band within a .grib2 file with: def getDataStats(grib2Filepath, bandNr): local_minimum = None ...
interwebjill's user avatar
2 votes
1 answer
118 views

QGIS - atlas print composer how to display mutiple values when adding attribute table?

I have this attribute table. I locked my atlas generator by county. For each, I want the statistics of all the cities that are in each county. For example : If the page of SICARIO is showed I want : ...
Sarah BOUTARD's user avatar
1 vote
0 answers
30 views

Zonal statistics

I am using Python on Visual Code Studio. Basically, I have two raster images, GHS SMOD (which classifies areas into 8 catergories of urban) and GHS POP (which uses world pop to calculate population). ...
Marziya Farooq's user avatar
0 votes
0 answers
74 views

Regarding Geographically Weighted Regression (GWR) for non-linear problems

I am new to this topic. I am referring to this Geographically Weighted Regression tutorial. From my understanding, GWR does a weighted regression to model the dependencies between exploratory and ...
gis_grad_student's user avatar
0 votes
0 answers
98 views

Histogram and Statistics not showing in ArcGIS Pro

I've been trying to calculate the histogram and statistics in ArcGIS Pro through Symbology. I've tried seeing the histogram of "create chart" (but it shows different results from Symbology's ...
Padrodi's user avatar
1 vote
0 answers
48 views

Different volume results in QGIS by using Raster Surface Volume and raster statistics

I have seen many questions similar to mine, but did not find an answer to my problem. I am using QGIS version 3.28.11-Firenze. I have a raster representing the difference between two DEMs on a fluvial ...
Sara's user avatar
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1 vote
1 answer
83 views

ArcGIS Pro: Area of certain land cover types for each main type (simplifiable?)

I have multiple areas with a unique ID (wetland sites) and now want to calculate the area of certain land cover types (grassland, woodland etc.) for each wetland site. I found a solution but am ...
Nepomuk's user avatar
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0 votes
0 answers
16 views

Creating table from distance raster

I have made a distance raster in ArcMap using the Euclidean Distance tool from one town to another that appears to be OK (see attached image). I'm trying to determine the distance from each parcel in ...
Dill's user avatar
  • 1
1 vote
2 answers
210 views

How to calculate the average elevation within a certain radius around a grid cell and apply the average to the grid cell in QGIS?

I have two layers in QGIS: a raster layer containing elevation, and a grid cell layer (polygon) containing 1km by 1km squares. I am trying to create a new layer where the elevation of each 1km by 1km ...
p1unge's user avatar
  • 109
0 votes
1 answer
64 views

Stats approximation by rasters in QGIS

Is there a way to "switch off" statistics approximation by rasters performed by QGIS? Approximated min and max values are automatically embedded into legend labels of rasters and I would ...
Jan Zachar's user avatar
1 vote
1 answer
80 views

Percentile values of a raster file are nan

I am trying to extract some statistics from all rasters in a directory and saving them into a CSV file using Python. The script works, but the results for all percentile values are always nan. Any ...
Isa's user avatar
  • 193
1 vote
2 answers
429 views

I want to test the statistical significance of the NDVI change in R

I have 20 Sentinel 2 satellite data for the period from 2017 to 2020, with 5 satellite scenes each for the months from May to September, covering one vegetation season. I am interested in whether the ...
Pebble's user avatar
  • 23
1 vote
1 answer
396 views

I want to apply Mann-Kendall test to NDVI of Sentinel 2 data in R

I have 20 Sentinel 2 satellite scenes from 2017 to 2020 with the months from May to September to cover the growing season. I calculated the NDVI of each scene and intersected it with my area of ...
Pebble's user avatar
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0 votes
0 answers
36 views

Same formula but different result in Google Earth Engine

Earlier, I asked Calculating statistical values from set of point values in Google Earth Engine regarding extraction of MNDWI values using sample points, which got resolved. But in that code, I am ...
CESCRA IARI's user avatar
0 votes
1 answer
68 views

Calculating statistical values from set of point values in Google Earth Engine

I have calculated MNDWI index. I have a set of sample points (collected over the waterbodies in Google Earth Engine platform itself) which I have used to extract the MNDWI values. Now I want to ...
CESCRA IARI's user avatar
-2 votes
1 answer
51 views

Summary statistics for a set of polygons [closed]

I have a set of a few millions polygons on which I'd like to compute summary statistics. I do know that what is relevant will depend on my needs, but I wonder if there is some agreed upon summary ...
cpa's user avatar
  • 119
2 votes
2 answers
119 views

Calculating the average of one field dependent on another in QGIS

I have a land use shapefile, which has a column: labelled "LU_1", categorising different areas quite broadly (9 categories total, they are numbered 1-7, U and V). There's also a field with ...
OFLO's user avatar
  • 21
1 vote
0 answers
142 views

QGIS Data Plotly widgets not installing correctly [closed]

I'm using QGIS 3.28.6 Firenze and installed the most recent version of Data Plotly. I'm trying to create a histogram with statistics of some data, and all the Data Plotly widgets don't show up when I ...
Ellabella234's user avatar
0 votes
1 answer
65 views

Spatial Interpolation of Point Layer with Count and Associated P-Value

Here's quick synopsis of the data I have. I have a dataset of just under 100 points with most points being coincident with several other points resulting in roughly 15 unique locations. Each point ...
TreeGIS's user avatar
  • 126
0 votes
2 answers
72 views

QGIS Report Slope Results

How could I report information about a raster result? In this case I have done slope analysis, and have reclassified it into 5 values for particular slopes. Now I am wondering if I can report ...
Jed C's user avatar
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1 vote
1 answer
99 views

QGIS raster statistics from information panel different to Raster Layer Statistics algorithm

I am wondering why the raster layer statistics presented in the Information panel are different to those calculated using the Raster Layer Statistics Algorithm? I note the line STATISTICS_APPROXIMATE=...
Saj's user avatar
  • 107
1 vote
0 answers
31 views

QGIS Statistic only for intersected areas

I would like to derive statistics (especially "mean") from a column of a layer, but only for those areas, that intersect with polygones of another layer. Is there an expression that can ...
Mat Thias's user avatar
0 votes
0 answers
100 views

Global surface water/ How to compare area of latest image to older images and generate histogram

Based on the Global surface water script, I would like to compare the water decreasing per year and plot a histogram for the area lost per year. I know that there is a dataset that goes by monthly ...
Rene's user avatar
  • 1
1 vote
1 answer
85 views

QGIS: Median for Raster layer zonal statistics

I want to know the median value of Raster A based on the value-defined areas of raster B. Using the Raster layer zonal statistics, I receive "only" value of sum, min, max and average. I used ...
weltraumkojote's user avatar
0 votes
1 answer
125 views

Spatial statistics -- geographically weighted regression

I have some count data (electric vehicle chargers). I'm trying to model its relationship with % of cars that are electric within an area. They show linear correlation. Normally I would use Poisson ...
Lord_Verulam's user avatar
1 vote
0 answers
120 views

QGIS Zonal Histogram failure on high resolution multispectral orthomosaics

I'm trying to run zonal histograms on high resolution multispectral orthos collected via drone. I'm trying do do vegetation assessments on crop, and when I run the QGIS zonal histogram function it ...
Jesse Lawrence's user avatar
4 votes
0 answers
210 views

Different minimum value in QGIS symbology options "singleband pseudocolor" and "Paletted/Unique values"

I want to color a TIF and manually add the max and min values to the opposite ends of a color gradient. However, different methods give me different min values for the TIF (the max is always 1). The ...
Wruke's user avatar
  • 41
1 vote
0 answers
60 views

Statistical test to assess significant difference in landcover selection

I have GPS collar data that I have used extract values to points through ArcGIS Pro on MODIS landcover data. From this I have a record on the number of times the animal has been in each landcover ...
Chelsea_VictoriaS's user avatar
1 vote
1 answer
272 views

Download and evaluate historical OpenStreetMap data

objective: I want to download historical OSM data for Germany and check the number of new added nodes, ways, relations within a certain time range (01.01.2007 to 01.02.2007). Afterwards I want to ...
Max Uellendahl's user avatar
0 votes
1 answer
908 views

Run a for loop in R to calculate monthly mean from an Excel sheet

I want to calculate the seasonal mean from monthly long-time temperature data. series<-data$Temperature p=5 new=NULL for(i in 1:length){ ydata<-series[((i-1)*p+1):(i*p)] yavg<-mean(ydata) ...
Tirthankar Ghosh's user avatar
2 votes
0 answers
154 views

How to address NA in pixel regression (local computation) with R terra package

For example, I have five NDVI TIFFs and five precipitation TIFFs. I used the code provided by Robert (https://stackoverflow.com/questions/63831287/extracting-p-values-from-lineair-regression-on-raster-...
jackywang's user avatar
  • 309
2 votes
1 answer
138 views

Calculate percentage of points within land cover classes QGIS

I am working on a project for my university and this is my first solo project. I have a land cover classification with 6 classes. I also have a set of points that are recorded sightings of a mammal we ...
Kora Lae's user avatar
2 votes
1 answer
114 views

Seeking faster alternative to arcpy.Statistics_analysis?

I'm using arcpy.Statistics_analysis to count records and it takes about 30/35min for a table with about 6.8 million records, in a bigger script, this is a big chunk of the whole time. The result of ...
FTeixeira's user avatar
1 vote
2 answers
354 views

How to use ArcPy SearchCursor, with a where clause, to return string formatted response with values

I am using an ArcPy Search Cursor to return the rows of a specified field within a shapefile. The for loop iterates through the feature class and returns the value of the rows in a formatted string as ...
Ryan Mags's user avatar
3 votes
0 answers
219 views

Statistical summary of points in a polygon (QGIS)

Is there any method for calculating the average, largest value, etc. (chosen statistic value) of points within polygons and giving the calculated value to the polygon?
Koko's user avatar
  • 31
0 votes
0 answers
92 views

Getting percentage of parcels covered by slope polygon file using ArcGIS Pro without using Identity?

I've read the other similar stack questions and they weren't helpful, as in the processes didn't work or there was some ambiguous field references that may have contributed to my confusion and error. ...
Scott Jordan's user avatar
3 votes
1 answer
197 views

Dynamic stats in the decoration title lable, by time stamp, in QGIS

I am trying to create a visualisation method of simple stats using the title label in QGIS canvas. I need to observe temporal changes in the stats, so I have tried to specify a dynamic chunk of text ...
Evanilton E S Pires's user avatar
0 votes
0 answers
145 views

Chi-square between rasters

I have two rasters (both with 10 m * 10 m resolution, for an area of approx. 1 000 km2) with the following variables. Both are categorical. A) Habitat type with 9 different classes. B) Soil moisture ...
kalopteryx's user avatar
1 vote
0 answers
375 views

Calculate statistics for multi bands

I would like to compute statistics for a multiband raster. How can I process? This is my code: python if os.path.isfile(_tmp_path_raster): dataset_raster = gdal.Open(_tmp_path_raster, ...
sarah1904's user avatar
2 votes
1 answer
102 views

QGIS starts a query "ST_SummaryStatsAgg()" on PostGIS3.0 for a raster and needs more than 10min to load

I am working on a test-server (RAID6) implementing PostgreSQL/PostGIS with vector and raster support. The aim is a big database sharing different data types including high resolution (0.5m, also 0.1m; ...
gisp's user avatar
  • 21
2 votes
2 answers
624 views

Finding average value of field within selected set of points using ArcPy with ArcGIS Pro

I have a large set of points in my map and a few masks which create a grid system. I want to find the average value of one field for all the points within each grid square. I already figured out a ...
Zachary Graves's user avatar
0 votes
1 answer
308 views

Do you need to factor in projection into area calculation in Google Earth Engine (GEE)?

I'm interested in calculating the area I have classified of a certain class. Do you need to account for projection to assess class area or can you run the following code and it will be accurate? I'm ...
user14005574's user avatar
1 vote
2 answers
1k views

Finding max value in field using ArcPy

I have a table and I want to find max and min value in specified field (f1) with their names. I used this code but I only could print max and min values in f1. How can I print their names Like the ...
Mohammad hassan moayyedian's user avatar
1 vote
1 answer
711 views

Calculating mean of full pixels within a box in ArcMap or ArcGIS Pro?

I am trying to calculate the mean of pixels within a boundary. I am able to find the mean using the calculate Statistics and Zonal Statistics as a table GP tool in ArcMap. But, the issue is I would ...
Yogesh Chavan's user avatar
0 votes
1 answer
141 views

How to find if a non-random subsample of a raster is significantly different from the raster using ArcGIS 10.7

I am attempting to find a way to test if the values from a non-random sample of my raster values is significantly different from the raster values as a whole. In this case, I have extracted values for ...
YamCham's user avatar
  • 123
0 votes
1 answer
188 views

adjust visualization parameters as parametric values

i want to define visualization parameters for maps as codes in main coding space not as import record for this, i want to calculate the min and max values of image and set them in visualization ...
Solmaz's user avatar
  • 149

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