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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20 views

Looping zonal statistics in QGIS?

Has anybody successfully used Zonal statistics in a loop in QGIS 3.8? I have to go through several rasters using a vector file. Batch processing seems to fail in QGIS 3.8 too - see Zonal statistics ...
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47 views

Zonal statistics using Python console in QGIS gives AttributeError?

Here is how the log shows for one raster image. I want to do this same thing for several rasters. The batch processing is not working. QGIS version: 3.8.0-Zanzibar QGIS code revision: 11aff65f10 Qt ...
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1answer
21 views

PyQGIS error when running zonal statistics?

I want to extract the sum of my raster cell values with a specific area through zonal statistics and have prepared the following code (see below). When I run the code I get the following error message ...
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12 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
1k views

Zonal Statistics for multiple rasters

I'm trying to create a timeseries of raster data (one layer per year) by polygon (Administrative regions). Is there any way in QGIS to perform Zonal Statistics for multiple years (without having to ...
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2answers
934 views

Problem with calculating QGIS Zonal Statistics MEAN

I need to calculate some zonal statistics from raster files for some polygons in a shapefile. I am using the following code which works: eligibleLayer = QgsVectorLayer("/home/usr/Desktop/...
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1answer
27 views

Zonal Statistics As Table with more than one zone?

I am trying to sum up the cells of a raster that fall within a polygon of multiple habitat types and ten management authority zones. Is there a way for Zonal Statistics As Table in ArcMap 10.5 to use ...
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16 views

Raster calculator and Zonal Statistics as a table do not work on joint combined raster?

I combined 3 raster files in ArcMap 10.4 and then joined 3 .dbf table to the combined raster and exported the result to a new .tif file. Now I am trying to run "Raster calculator" and "Zonal ...
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2answers
46 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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1answer
49 views

Zonal statistics error - Algorithm Zonal Statistics starting… DatasetReadAsArray() got an unexpected keyword argument 'interleave'

After updating QGIS to 2.18.28 I cannot use Zonal Statistics. As soon as I use it (Raster EPSG 25830 and Polygon 25830), I get the following error message "Algorithm Zonal Statistics starting... ...
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2answers
766 views

Correcting Errors in Height Above Nearest Drainage (HAND) model

I have used this tread Spatial Analysis - Calculate a cells elevation (height) above the nearest stream cell to create a HAND map in ArcGIS. First I used the hydrology toolset to fill in sink in the ...
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76 views

How to remove negative values from a created HAND model

I have used ArcGIS to create a HAND (height above nearest drainage) using an SRTM DEM. However, some small portions have negative values in the model which is supposed to have zeros as the minimum ...
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48 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 ...
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1answer
46 views

Calculating areas of polygons that match with overlapping raster threshold value?

I have a polygon of districts (districts.shp) and a raster of rainfall (rainfall.tiff). I want to calculate the area of each district that saw rainfall greater than various numbers. I'd like to ...
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1answer
62 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 ...
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34 views

Looping a function over a sequence of parameters with iterate()

I built a function landcov(area, date) to calculate the share of land types 0 to 3 in year "date" from MODIS12Q1 within the polygons of the "area" parameter. I want to use iterate() in a loop-like ...
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3answers
56 views

Model Only calculate value with zonal statistics as table

In a precedent post Multiple Output for Zonal Statistics as Table I was trying to have as many table in the output as the rasters in the input. To overcome my errors, I decided to add a "Model Only ...
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18 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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1answer
56 views

Multiple Output for Zonal Statistics as Table [closed]

I am trying to merge NDVI data from 2005 to 2018 (two .tif per decade) with a region land use. For this, I have used "iterate rasters" with 36 of .tif I'll be using, as the 'Input value raster' of ...
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1answer
37 views

Aggregating raster based on zones?

I'm using ArcMap 10.6.1. I have raster data and census tracts for Los Angeles. My goal is to take the mean value per census tract. I then want to aggregate all the cells in each census tract to be a ...
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4answers
66 views

Determining NDVI of polygon using ArcGIS Desktop?

I have calculated the NDVI of a city. Now I want to know how "green" every street segment in that city is. I therefore buffered 7.5m on every street segment. I then used the Zonal Statistics as a ...
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201 views

Trouble interpreting zonal statistics as table output

Consider this a follow-up to this question. I transformed a census block group vector map (decided to use this instead of census tracts) into a raster map and generated a kernel density map using ...
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1answer
41 views

Zonal Statistics as Table: 999999 Error

I am receiving a 999999 error each time that I attempt to run Zonal Statistics as Table. I am attempting to overlay population data from an asc file with a shp file with French Alsatian municipal ...
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1answer
35 views

Understanding difference between area calculation when using zonal statistics tool and identify button?

I am working in ArcGIS Desktop 10.5 and I am a beginner. I have very basic, non-overlapping polygons over a raster that represents bathymetry data. I need to figure out various statistics about each ...
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1answer
35 views

Every geoprocess with merged raster produces 999999 (ArcMap 10.6)

I have a county where there is some LiDAR (1 meter) coverage. For the rest of the county I downloaded 10 meter DEM from USGS. Both rasters are in same projection and units. I resampled the 10 meter to ...
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1answer
116 views

Zonal Statistics is returning null values in ArcGIS Desktop?

I am using Zonal Statistics as Table to obtain the Max height from a DEM for each polygon (then Joined to the polygons). For some reason, a lot of the polygons get NULL returned. All the polygons ...
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15 views

XML to TIFF raster and zonal statistics in QGIS

I was sent several XML files of a flood model's peak extent that works fine in ArcGIS, I need to use zonal statistics, and I don't have that available in my workplace's ArcGIS subscription, so I need ...
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3answers
483 views

Some zones disappear when running Zonal Statistics as Table in ArcGIS

I'm new to GIS. I want the sum of nighttime lights (DMSP) by district for some country. I'm running this arcpy.gp.ZonalStatisticsAsTable_sa(Limites_distritales, "IDDIST", rc, temp_table, "DATA", "") ...
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1answer
206 views

Zonal statistics error in arcpy

I'm trying to get the zonal statistics output (mean), do some operations and add to my main archive the output value. I wrote this code, but it's not running, the error message is: Traceback (most ...
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18 views

Weighted averages: accounting for cell size

I'm a non-geographer using ArcMap 10.6. I have a similar question to the two asked here: Weighted averages: accounting for grid cell surface variation in proportion to the cosine of its latitude I ...
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29 views

Build measure of state change

I want to be able to build a measure in ArcGIS (ArcMap). (1) I have some shapefiles of sovereign states by centuries. These are polygons with the name of the state as ID. (2) Moreover, I have a ...
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3answers
751 views

Wrong min value from ArcGIS 10.4 zonal statistics as table

I used the zonal statistics as table tool in ArcGIS10.4 to calculate SRTM, the in_zone is a gridded shapefile, the in_value_Raster is the SRTM extracted for the region as in the image (90m x90m). The ...
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1answer
52 views

Counting .tif value in polygon in QGIS

I am trying to count raster values (from a .tif file) in polygons. In previous posts that people suggested using the 'zonal statistics' plugin in QGIS. However, I couldn't find it in my plugin manager ...
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1answer
427 views

QGIS equivalent to the ArcMap Zonal Statistics as Table

Is there a QGIS equivalent to the Arc: Spacial Analyst: Zonal: Zonal Statistics as Table? Given the USDA Cropland Data Layer, Would like to count the pixels by type within a county.
3
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1answer
100 views

QGis raster categories proportion per polygon

I have a raster layer of landuse and a vector layer of areas of interest. I would like to calculate for each polygon (areas of interest) the proportion or number of cells of the raster for each ...
2
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1answer
310 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= ...
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1answer
36 views

Different area values from Zonal Geometry and Tabulate area

I am working on Landcover map for Ghana. I calculated the area of each landcover type with Zonal Geometry in ArcMap. Then I wanted to know the area of landcover in each region (as in location). But ...
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2answers
172 views

Running zonal statistics on multiple raster tiles using QGIS?

I'm new to QGIS (2.18.11). I've got OS Terrain 50 elevation data, in around 150 ASC tiles (10 km x 10 km) covering my whole area of interest (north-east Scotland). There is just a single band. I've ...
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0answers
25 views

Getting gridded population to resolution of land cover?

I have a population data at census tracts level and an impervious land cover. Impervious land cover is of 30 m resolution and census tracts data stored as a vector. Is there any way that I can ...
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0answers
77 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. ...
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1answer
56 views

Clipping multi-band Sentinel-2 composites in ArcMap?

I am using Sentinel-2 images and I want to clip the image with a shapefile I made. (The shapefile was smoothed with Smooth polygon with a 10m PAEK tolerance). I have tried the Raster clip tool and ...
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0answers
50 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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1answer
1k views

What do “count”, “mean”, and “sum” in QgsZonalStatistics mean?

I am working with Qgis and making some analytics of lightdata. I've used these commands: rasterfile = qgis.utils.iface.mapCanvas().currentLayer().source() vectorlayer = qgis.utils.iface.mapCanvas()....
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1answer
211 views

Arcpy Error 010423 when using Zonal Statistics to Table in a tool

I want to include Zonal Statistics to Table to my tool. But if I do I get the following error: Traceback (most recent call last): File "C:\Users\xyz\Desktop\test.py", line 16, in <module> ...
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1answer
26 views

Performing overlapping zonal statistics in ArcGIS?

I have buffer lines overlapping and within these lines I want to know the type of land use. However, overlapping is not allowed with Zonal statistics. How do I do this in ArcGIS because I want all ...
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0answers
60 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 ...
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3answers
7k views

Iterate through multiple Raster files and compute statistics using Zonal Statistics

I have a large number of raster images. What I'd like to do is to compute statistics on different sections of these raster files using a polygon. I think everyone is suggesting Zonal statistics. ...
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1answer
130 views

Accessing Zonal Statistics for QGIS on Mac?

I've just updated to QGIS 3.4 for my MacOS (10.12). I'm trying to run some occupancy analyses and am looking to extract attribute data for a polygon grid from an underlaying raster file. ZonalStats ...
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1answer
110 views

Using Zonal Statistics to determine percent forest cover in grid cells?

The basis of what I am trying to do is determine what percent of forest cover is within a set of 1x1 km grid cells in arcmap. I originally attempted to do this using fishnet, tabulate area tool, and a ...
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2answers
151 views

Clustering 30m pixels into 120m pixels, fishnet using QGIS?

I have a raster file representing tree cover loss made of 30m*30m pixels taking the value 0 or 1. 0 means no loss and 1 means tree cover loss. I want to cluster these pixels into bigger pixels of the ...