Questions tagged [zonal-statistics]

Zonal statistics summarize the values of one raster within the zones of another dataset (either raster or vector) and output the results as a raster (for a single statistic) or table (for multiple statistics).

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48 views

Reducing tree cover area from Hansen in GEE yields me areas larger than the feature itself

I am trying to calculate the tree cover in Maine (by county) using the reduceRegions() tool. I based my code on this thread. I am interested in areas in square km. The output of my code yields, though,...
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1answer
263 views

Zonal Statistics of Unique Patches (Clusters)

How do you calculate the number of occurrences of a category that occur in each cluster using Google Earth Engine? My goal is to figure out the percentage (or # of pixels) of each landcover type that ...
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1answer
1k views

Calculating NDVI per region, month & year with Google Earth Engine?

I want to calculate the mean NDVI per region (admin level 3, also called woreda), month and year. So my end result would look something like this: regions year month NDVI ------------------...
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Can't select vector layer QGIS Zonal Statistics

I'm running QGIS 3.4.0 on Ubuntu 18.04.1. I have a raster layer and a vector layer from a .shp file in the same CRS. When The window pops up for zonal statistics, I can select my raster layer but ...
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128 views

Memory errors when doing Zonal Statistics on a multi polygon shapefile in Python

I want to calculate the mean NDVI with the EthNdvi.tif file for each zone (there are around 650 admin zones) in the the woreda shapefile. I'm having some issues with running the following lines of ...
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1answer
2k views

Using ZonalStats in QGIS 3.0.2

I'm using the above mentioned QGIS version, and it somehow does not include ZonalStats plugin. I installed ZonalStats 0.0.4, but plugins now says this is designed for QGIS 1.7.2-1.99 and does not work ...
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2answers
444 views

Getting a masked raster with no NAs and sum pixels within overlaying polygon?

I have done an IDW interpolation in R for precipitation data following the routine of Manny Gimond (https://mgimond.github.io/Spatial/interpolation-in-r.html) to get precipitation inside a catchment. ...
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1answer
238 views

Statistics of NDVI mean by shapefile using GEE [closed]

I am new researcher using GEE and want to use a shapefile (e.g.,Provincial boundaries) to achieve NDVI mean of each province using GEE, how should we do it? code: // Create a mosaic of Landsat 5 ...
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50 views

PyQGIS: Zonal statistics not being written due to too many digits

I am using Python in QGIS to calculate zonal (sum) statistics for an array of raster layers using the following code: polygonLayer = QgsVectorLayer('E:/folder/' + 'gadm0.shp','','ogr') ...
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39 views

Obtaining Non-Summary Zonal Statistics from Raster Data

I am using ArcMap 10.5.1. The data I am looking for are zonal statistics from a raster using polygon-defined zones. I can use the Zonal tools to calculate summary statistics, but I am looking for the ...
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1answer
120 views

Add a common property to all sub-features of a feature collection in Earth Engine

I am new to earth engine and am struggling with a very simple task. I want to calculate the average NDVI for the counties of Maine for the month of January 2018. I manage to do so but, before ...
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1answer
359 views

Standard deviation for percentiles interval in Google Earth Engine

I'm working on a GEE script aiming to extract DEM-based elevation statistics for regions defined by polygons. Specifically, I want to obtain the mean, median, standard deviation, and min/max values of ...
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1answer
139 views

Combining zonal statistics of multiple rasters into a single table ArcGIS Pro

I have a collection of 22 raster images from which I need to find the min, max, and mean, and put the results from each image into a single combined table. This question is very similar to what I am ...
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2answers
681 views

Calculating statistics per area for categorical raster using R?

I am working with the area of New York City (NYC) in ArcGIS 10.1. I have a landcover raster map with several different land cover categories. What I am trying to do is to build up a table in which, ...
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2answers
303 views

“Zonal” Statistics Using Line Features

I would like to find the minimum, maximum and (weighted?) average value of the raster cells intersected by a line (vector) layer. This is similar to what common "Zonal Statistics" tools do, but they ...
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2answers
233 views

Calculate average value from netcdf

I have precipitation data from NOAA in a NetCDF format. I imported that into ArcGIS as a raster layer. Now I see that I can only get the precipitation value for one year at a time. I need to ...
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101 views

Perform zonal statics with the Rcaller in FME-desktop

I am trying to use the Rcaller in FME to perform zonal statistics. input: shapefile and a Geotiff I read that the Rcaller reads the input data as a dataframe when it is imported into the Rcaller (R)...
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2answers
672 views

Plotting and analyzing extracted elevation data in R?

I have a shapefile of county boundaries for New York state and elevation data downloaded through the elevatr package. library(elevatr) library(raster) library(sf) library(USAboundaries) counties <...
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2answers
49 views

Calculating Zonal Statistics outside of polygon using ArcGIS Desktop?

Is there a way to calculate zonal statistics outside of polygon? I want to extract the mean values outside of the polygon. In this case, instead of calculating for the land, I want to use the ocean. ...
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0answers
155 views

Zonal statistics multiple band raster [closed]

I have a raster which is a yearly time series, it is created with 30 raster. It is saved then as a raster with multiple bands. I am trying to calculate the zonal statistics of all the bands at once. ...
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102 views

Zonal Statistics As Table with Very Small Polygon

I was given one single band NDVI raster and a shapefile with multiple very small polygons. The raster has a resolution of 3m. On the other hand, the small polygons on the shapefile are square shaped ...
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2answers
374 views

QGIS Zonal Statistics returns empty?

Does anyone familiar with the QGIS Zonal Statistics tool know why stats calculations might return empty? Inputs DEM for South Carolina: http://dnr.sc.gov/GIS/descdem.html A vector shapefile: https://...
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1answer
199 views

Zonal stats for complete pixels qgis

I am trying to extract zonal statistics from raster imagery using polygons in QGIS 3.2.1, but I only want to use values from those pixels that are completely included in the polygons, ¿how to do this? ...
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42 views

Putting raster values in polygons ArcGIS

I'm trying to extract values from a raster file dataset (called land_use) to polygons (in a file called Hydro_buff) that I have created. I read a few questions on that topic but some other issues come ...
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45 views

Calculating area of pixles for certain Aspect value per specific area?

I am using ArcGIS 10.6. I have the aspect (raster file) for the roof of buildings at the city scale. Now I want to calculate the area of each aspect group per building. I tied zonal statistics, zonal ...
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37 views

Zonal statistics tool excluding some features in ArcMap? [duplicate]

In Arcmap 10.6, while using Zonal Statistics as Table tool, some of my feature zone data is being excluded from my output table. Here is the scenario. I'm using a polygon layer of buildings, with a ...
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1answer
234 views

Getting data on area where shapefile overlaps raster file using QGIS?

I have attached an image to help explain what I am asking. I want to get the average value of where the heat map crosses over each municipality in the shapefile and export those values into a ...
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1answer
152 views

Getting zonal statistics of polygons not touching center raster cells in PostGIS?

I'm working a postgis processing zonal stats from raster and I couldn't manage the problem of raster with so low resolution (like 9km width) and small polygons. My problem is, these rasters are big (...
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1answer
102 views

Mask a Raster layer in QGIS using a vector layer with multiple polygons

I would like to extract statistics from a raster file based on a land cover classification vector file, however the land covers (features) are not contiguous (see pic). In the example below, I would ...
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2answers
176 views

Polygonize a multi-band raster

I have a polygon and I want to estimate areas of different types of land cover tha falls within the polygon. The problem is that the only freely available land cover data I found is https://catalogue....
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3answers
80 views

Arcpy - process large shapefile in groups of 100 via cursor

I am working with a large(ish) shapefile containing 30,000 features. I am trying to run a zonal histogram and have been running into many problems. Running this function with the entire set of ...
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1answer
360 views

TypeError: QgsZonalStatistics(): arguments did not match any overloaded call

There is no problem in running this code in qgis 2.x but it through error when I tried in qgis 3. def _calculate_means(self, polyg_layer_files, raster_layer_files, attribute_names): # ...
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0answers
56 views

Unexpected elevation values from SRTM using Zonal statistics

In QGIS 2.18.18 on Windows 10, I have downloaded the NASA file srtm_05_01.tif that is available at http://dwtkns.com/srtm and the airports.shp file available at http://qgis.org/downloads/data/...
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1answer
92 views

Losing information using Zonal Statistics?

I produced a raster map representing estimates of the number inhabitants in pixels of 100x100 meter and I want to calculate the total of inhabitants per administrative units that are represented by ...
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1answer
40 views

Calculate Values from a raster surrounding a list of addresses

I have a list of addresses and I have geocoded into a shapefile in ArcMap 10.4. I've also made a raster that stores NDVI data (with water masked out as it will skew the values we are hoping to obtain ...
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1answer
20 views

Marking zonal statistics areas with a point

I'm working with Lidar data, and my end goal is to get a collection of points representing cliff bands, with key information attributed to the individual points. So far I've been able to identify my ...
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0answers
242 views

How to open memory data with ogr in rasterstats function?

I would like to reuse vector data created in memory in another function called rasterstats (source code, documentation): I have a function that creates vector data: def createPolygons: ...
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0answers
56 views

On-the-fly zonal statistics in QGIS

I would like to know if there is a plugin/method in QGIS to calculate zonal statistics (mean, median, range, max, min etc.) of a raster file, corresponding to a polygon that I draw/highlight in QGIS. ...
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1answer
105 views

Zonal statistics returns empty on Landsat 8 raster data in QGIS

I have derived surface temperature from the Landsat 8 thermal band 10. My vector file is the following: Small Areas City of Melbourne I want to calculate the mean, median and maximum temperature of ...
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1answer
43 views

How to treat bias? Calculate zonal statistics proportionally?

Using ArcGis 10.4 I don't know if this is even possible, but I want to give it a try. The following problem: I have subcatchments (built from a DEM) and I have a river shape. This river shape is ...
3
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1answer
181 views

How to tell zonal statistics plugin to ignore “No Data”?

I have a shapefile and a raster. They superimpose to a greater degree except at edges where raster pixels do not extend up to layer boundary (see image if it was not clear). The green line is from ...
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306 views

Zonal Statistics or Tabulate Area by Multiple, Cascading Zones [closed]

A basic GIS task that I regularly come across in my work is to calculate the area of a variable of interest by multiple, overlapping and/or hierarchical zones. I am looking for a more efficient way to ...
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2answers
790 views

How does QGIS Zonal Statistics handle partially overlapping pixels?

There are a couple Stackexchange posts asking this question, but neither of them were sufficiently answered: How does Zonal Statistics work exactly? How does Zonal statistics handle pixels that are ...
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0answers
50 views

How to display min and max pixel from Zonal Statistics?

I am trying to find the maximum and minimum pixel from a raster inside the area of a buffer. I can succesfully get the values using Zonal Statistics, but it doesnt tell me which pixel is the max and ...
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2answers
382 views

Zonal Statistics as table in model with two iterators using ArcGIS Desktop?

I am using ArcMap 10.4 (with Spatial Analyst.) I have a feature layer with ~11.000 partly overlapping but similar features. For each feature I want to extract some values from ~25 underlying rasters. ...
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1answer
205 views

Multiple histogram from a raster image in R

I need to get multiple histograms from a tif image. I have the following data: A big raster tif image: tif1 <- raster("myRaster.tif") hist(tif1, breaks= 10) # gives the entire histogram A ...
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0answers
183 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 ...
1
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1answer
37 views

Corine data aspect analysis in ArcGIS

I have a SRTM dataset, Corine Land Cover and have already calculated aspect. I want to know the relative proportions of exposition classes of certain landcover type. My thought was to use zonal ...
2
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1answer
77 views

Conditional zonal statistics

I have often used the Zonal Statistics plugin to calculate the mean pixel value of a raster. However, this time I have an additional Boolean (pixels are equal either to 1 or to 0) raster, which is ...
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0answers
358 views

Using zonal statistics code from Python GDAL Cookbook?

I am new when it comes to GIS and relatively new when it comes to programming. I was trying the “zonal statistics” recipe from the Python GDAL/OGR Cookbook, but I cannot get a decent result. For the ...