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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84 views

Find area under different colors in TIFF?

I have a TIFF file that has 17 bands (colors). Each color corresponds to different land use land cover characteristics. Additionally, I have a shapefile of a district with blocks. I want to find the ...
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295 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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447 views

QGIS Zonal Statistics for polygons is missing results?

I am carrying out an analysis using QGIS 2.14.1 where I am dealing with point data that have been randomly displaced by either up to 2 Km or 5 Km. I have generated a buffer of the appropriate radius ...
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108 views

Zonal statistics behavior

I have an issue for the result of QGIS Zonal statistics mean values. I expect the value for the polygon marked red (poquoson) is about 26.6 but it seems that it is averaged value over one right ...
4
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0answers
821 views

Zonal Statistics tool not working with QGIS?

I wanted to try the QGIS 2.14 zonal statistic tool but it doesn't work.The system says: not a sequence See log for more details The SAGA Zonal Statistic tool works fine. It also doesn't work with ...
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1k views

Zonal computations: computing raster pixel counts within polygons using GDAL versus rasterstats

I'm computing some zonal statistics, and was comparing the results obtained using the GDAL cookbook example code here with the rasterstats zonal_stats function. I want to compute the mean value per ...
3
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1answer
45 views

Zonal Statistics as Table gives error when there is no overlap

I'm trying to generate Zonal Statistics with a raster and set of polygons. In my case the polygons represent census tracts in the US and the raster is population density. The problem is that ...
3
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0answers
61 views

Calculating number of different colored pixels in multiple polygons at once

I have a raster with 17 different colors. I need to find the count of pixels in each colour. I could use Zonal statistics for one polygon but I have to find the count in multiple polygons at once. How ...
3
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0answers
360 views

How to extract land cover type data (%) from raster file using Zonal Stats from overlaid polygon grid, QGIS

I have a very large raster file of land use types for a landscape. I am trying to run an occupancy model of large carnivores and need to test the weight as a covariate, of human settlements. Human ...
3
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0answers
153 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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74 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. ...
3
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62 views

Zonal Statistics calculator differences between QGIS Lyon and Wien

I am trying to implement a process that uses the Zonal Statistics menu function. In Lyon, the menu that pops up had a field with a list of calculations, each with a check box. Here you can select what ...
3
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0answers
960 views

Extract values from raster based on weighted average area using polygon grid

EDIT: I am using Armap 10 sp 5 I have found similar questions but they were either unanswered or somewhat different to what I am asking. I have a raster with cell values 1-5 and a polygon shape file ...
2
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1answer
59 views

How GEE align pixels and projection when reduce resolution?

Here is the thing: I want to count how many Landsat pixels 30x30m were included in a 500x500m MODIS pixel. It is basically a zonal statistics, and I use reduceResolution to compute. But the issue is: ...
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0answers
17 views

Statistics from one image to another in Google Earth Engine

I now have two images of the same place, image1 stores image values and each pixel on image 2 stores time (jday).I want to count the sum of image values of image1 at the same time point on image2.For ...
2
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133 views

Python: How to get x,y coordinates of the highest raster values located in a list of polygons

I would like to extract and convert to a shapefile the coordinates of the highest pixel values located in several polygons. Such treatment was quite straight forward to achieve in R but I'm a total ...
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0answers
20 views

Determining raster points inside polygon

I am trying to perform zonal statistics on a input DEM and a polygon shapefile using ArcPy in Python 2.7. I have done this in Python 3, but want to be able to do it using ArcPy tools in Python 2.7. So ...
2
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0answers
90 views

Error 999999, Table name is invalid - Zonal Stats as table

I am attempting to run a model that iterates rasters and computes zonal statistics returning a table. The raster's statistics are computer across all polygons in a specific shapefile. This model ...
2
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1answer
89 views

Calculating percentage of area by district of land use type

I have a file geodatabase feature class, type polygon, of land use type. SEQ LU Update X project clip in the attached. I have a districts shapefile (shapefile feature class polygon). All_Brisbane in ...
2
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0answers
107 views

Calculating NDVI values for specific zones using zonal statistics using QGIS

I am currently working with multispectral data from a MicaSense RedEdge M on a plot size study in wheat research plots. I want to conduct zonal statistics to calculate NDVI for individual plots. I ...
2
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0answers
69 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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57 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 ...
2
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0answers
589 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 ...
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0answers
339 views

Change coordinates of raster file

I'm trying to compute zonal statistics but get an error saying that "negative dimensions are not allowed". I'm assuming its because my raster file extends into negative coordinates. Extent of the file ...
2
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0answers
79 views

Missing Observations in Zonal Statistics Tool

I am using zonal statistical tools. I have field boundary shapefile which has 1,062,063 observations. I am using zonal statistical as table tool to obtain precipitation values from raster layer. ...
2
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0answers
178 views

Median and Mode estimations in the QGIS Modeler?

I would like to know if there is anyway in which I can combine the available tools in QGIS in the Modeler to estimate median and mode values from a raster (DEM) using polygons. I know the zonal ...
2
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1answer
377 views

Zonal Statistics on discrete values in raster using ArcGIS for Desktop?

I am using ArcGIS 10.3 for Desktop. I am using Corine Land Cover raster data for Southern European Countries, this data gives discrete values to particular land uses (e.g. 1 = agricultural land, 2= ...
2
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0answers
180 views

Zonal statistics error: 0-d arrays can't be indexed

How can I fix the error 0-d arrays can't be indexed? This message appears after the tentative to use the algorithm Qgis Zonal Statistics. Detail: the algorithm worked very well several times and then ...
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0answers
669 views

Remote sensing Classification and texture analysis compared with QGIS zonal statistics

I am Using Geomatica to analyse suburban spectral signature in Las Vegas. Ran a texture analysis on all band images. Combined texture bands with original image bands to run an unsupervised ISODATA ...
2
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0answers
110 views

Does converting polygon to raster generate more accurate results from the Zonal Statistics in Arcgis 10.2

I have heard the following for Arcgis 9.1 and wonder whether it is still an issue in Arcgis 10.2. If so, should I convert the polygon into raster before dissolve or convert the dissolved polygon ...
2
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0answers
2k views

Zonal Statistics using Gdal and Python

I recently came across a loop_zonal_stats function by @ustroetz found here: Issue Trying to create Zonal Statistics using Gdal and Python.. I am using a (single) polygon shapefile and a raster file to ...
2
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0answers
417 views

How to use Zonal Stats as Table tool with in-line variable substitution

I have created a model to iterate a folder of 5 shapefiles to apply the Zonal Stats as Table tool to a raster. My output table is saved as table%i% so i'm expecting it produce 5 tables (table0, ...
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0answers
1k views

How to Calculate Utilization Distribution Overlap Index (UDOI) in ArcGIS

I'm interested in calculating the overlap of home ranges (=utilization distributions in my case) of a bird species using sighting coordinates. This article introduced UDOI as the best index for such ...
2
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0answers
622 views

How to use GRIB data in ArcGIS? (Zonal Stat as Table)

I am trying to calculate zonal stats as table with a python script for 45 .grib files from the ERA-40 Monthly Mean of Daily Mean database (http://data-portal.ecmwf.int/data/d/era40_moda/) for certain ...
1
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1answer
24 views

Calculating zonal statistics for each polygon in shapefile using GEE

I have shapefile of counties and want to calculate mean NDVI for each. I know reducing connected components and ee.reducer.mean can be helpful in GEE but it wants it as CSV for further analysis in R ...
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0answers
34 views

Calculating mean value for all pixels within given distance for all pixels in study area using raster analysis in QGIS

I am working in QGIS I have a raster layer depicting the population density for a country. A portion of this raster layer is used as a study area. I want to know for each pixel in that study area what'...
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0answers
34 views

Speed up zonal statistics with additional calculation

I have two rasters, one is a classified image and the other the corresponding probabilities for a correct classification. Now I need to calculate zonal statistics for polygon segments in the following ...
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0answers
16 views

Managing coordinates and projections for zonal statistics on global data

I am working with a global raster that is in the World Mollweide (EPSG: 54009) projection. I also have a set of polygons from different parts of the globe that are shapefiles in the WGS 84 (EPSG: 4326)...
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2answers
46 views

“Zonal statistics” for two polygon layers using ArcMap

I have 2 polygon layers: one is a vector grid with attribute values for each "polygon cell" the other including administrative boundaries I would like to calculate the mean value of all ...
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2answers
65 views

Zonal statistics USFS tree cover by census block

I want average tree cover for every census block. I have a file of census blocks, and I have a USFS tree cover file from USFS Tree Canopy Cover Datasets that looks like this: I'm trying to use zonal ...
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0answers
130 views

Zonal statistics for multiple rasters with overlapping polygons

I have a shapefile with 300 polygons that correspond to 300 rasters (the rasters have the exact same extent than their corresponding polygons). What I'm trying to do is to run Zonal Statistics on this ...
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0answers
20 views

Test for spatial uniformity of areal variable

Suppose we have data for uniform polygons with weight variable n and value variable x representing an average of observations within each polygon that looks like this: n x ...
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0answers
164 views

Raster Zonal Statistics for large files

I have a shapefile that consists of 375m x 375m cells from the State of California, consisting of a total of 3,022,037 cells. The raster file covers the same geographical area, but consists of smaller ...
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0answers
116 views

Iterate raster data error 00964

I'm building a model in arcmap 10.7 model builder to determine zonal statistics for multiple raster in a geodatabase. The model works, but only when i run it through model builder. When I try to run ...
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0answers
89 views

Avoiding greyed-out rows in ArcGIS batch processing?

I'm using the batch processing ability in ArcMap 10.6.1 to run a ModelBuilder tool using Zonal Statistics As Table and Add Fields on a bunch of rasters. When I try to specify where to save the output ...
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2answers
332 views

Python Zonal Statistics Problems in QGIS

I am trying to run Zonal Stats for Block Group shape files against NLCD Percent Impervious raster. I have shapefiles for 48 contiguous states all projected to the same as the raster. I've written ...
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0answers
56 views

Using Join Field more than once in ArcGIS Pro ModelBuilder?

I have a model where I'm trying to aggregate the zonal sums of a set of ~30 rasters into attributes on a shapefile of country boundaries. Ideally my model would create a new field in the country ...
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0answers
84 views

R process: Zonal Stat Raster has No Data Values vs Arc output

I am trying to re-create my ArcGIS Zonal Stat model with R All my files will be 30m pixels; 18000 x 18000. I have used R two different ways to create the output and both create NoData values in the ...
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0answers
90 views

Model Builder iteration process problem: could not create the output tables invalid extension

I encountered problems with my Model Builder in Arcmap 10.4: I want to perform some statistics on my rasters using the same polygon (buffer). I use the Raster Iteretor and I did check if the extent ...
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0answers
105 views

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 ...