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).

learn more… | top users | synonyms

1
vote
0answers
19 views

Zonal geometry output in ArcGIS

Is there a way to specify the coordinate type in Zonal geometry output in ArcGIS? I am trying to perform zonal geometry on a raster and in the resulting output, the XCENTROID and YCENTROID are in ...
0
votes
0answers
27 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 ...
1
vote
1answer
19 views

Querying Raster Dataset by Location to Study Area

I have downloaded a very handy raster dataset generated by the Nature Conservancy for identifying terrestrial habitat cover types in the north east. Link to the project info and a link containing a ...
1
vote
0answers
14 views

Clarification on a previous Utilization Distribution Overlap Index (UDOI) answer

I'm really struggling to calculate the Utilization Distribution Overlap Index (UDOI) and could really use some clarification on a previous answer. There is a comprehensive guide to what i am trying ...
2
votes
1answer
71 views

Monthly weather averages using NCEP/NCAR Reanalysis data

I'm a political science grad student and I've recently (and probably foolishly) committed to dipping my feet into GIS. Right now I need to build a table that has monthly precipitation and temperature ...
0
votes
0answers
34 views

Zonal Statistics As A Table - Missing Features in Results

I have a point shapefile that includes parcel centroid features across a county in Pennsylvania. I am trying to get a sense of the percentage of forest land within half-mile and mile buffers around ...
0
votes
0answers
42 views

Proper size of buffer to represent village boundary using Geonames populated places

I am trying to estimate population for each Geonames populated place (PPL) in Tanzania. There are about 8000 PPL, represented by point features, however population data is missing. I used ArcGIS to ...
2
votes
1answer
49 views

Memory issues with zonal statistics

I have got a memory issue due to the use of the zonal statistics command into a loop. It seems that after using the ZS command QGIS stores some information in the RAM (cache memory?). It is not ...
2
votes
1answer
56 views

Issues with PyQGIS while running a QgsZonalStatistics script

I have experienced a very bizarre issue with my PyQgis code. I simply want to load a raster and a vector layer to do zonal statistics, the first part works perfectly but for the zonal statistic I have ...
0
votes
2answers
60 views

Mean values of points within a polygon layer

I have 2 shape files (1x points and 1x polygons). The points have different values (soil sampling results). What I want to do is to calculate the mean values of the points inside the different ...
0
votes
0answers
49 views

Zonal Statistics as a Table does not calculate statistics for all features in the dataset

I want to compute the mean elevation (slope, aspect) within an area of 800m around the nodes of a vector grid I have applied, using "Create Fishnet". Because my buffers overlap, I cannot use "Zonal ...
1
vote
2answers
78 views

Tabulate Area in ArcGIS for Desktop not creating correct output?

I have used the Tabulate Area zonal spatial analyst tool in ArcGIS many times, and am encountering a problem for the first time. I am using a polygon grid (fishnet) as my zone dataset, and tabulating ...
0
votes
0answers
44 views

Zonal Statistics “Invalid Output Extent”

I have an NDVI layer masked to a Corn layer. I have laid on top of it a 8x8m grid; from that grid I have taken just the grid cells that fall completely within the Corn NDVI raster. It looks like this: ...
2
votes
1answer
86 views

Find local maxima with variable window search using ArcGIS Desktop?

I would like to find local maxima in different zones of raster file. I got five zones (zone 1, 2,3,4,5) and would like to find local maxima with different window search for each zone in arcgis ...
0
votes
2answers
34 views

Creating new raster based on spatial extent and classes of one raster and average of another using ArcMap?

I have a raster that is split into classes and I wanted to make a new raster with this raster's spatial extent and classes but displaying the average values from a different raster. I am not really ...
0
votes
0answers
24 views

Looking to fine the average slope within a polygon [duplicate]

Question not a duplicate.. please help; I am using ArcGIS 10.2 (not open source software) and I have a high resolution DEM, 1.0m resolution, and I am looking to find the average slope and range of ...
0
votes
2answers
156 views

ArcMap Zonal Statistics not producing attribute table

I'm using the zonal statistics in spatial analyst ArcMap 10.2. The input zone is a feature (conterminous US states) and the raster (.tiff - signed integer) is biomass for the entire conterminous US. ...
0
votes
1answer
107 views

error invalid output extend in zonal statistic

i have a problem with arcmap10.2...i have a dtm(that now has dimension of the pixel 1000) and another raster whit the same resolution with the code of a specific area..what i want to do is calculate ...
3
votes
3answers
189 views

How can I determine which raster attribute covers the highest area of a polygon?

I'm relatively new to GIS and QGIS but I have a problem that I'm not certain how to solve. I searched here for relevant information but found none. (Or, I used incorrect search terms.) My problem ...
3
votes
0answers
86 views

Zonal Histogram Output Problems - No values associated with the habitat type

I have a outline of some islands (shapefile or raster) and GAP landcover data (raster). I am trying to use Zonal Histogram to create a file with a histogram of the habitat types in each island. Each ...
3
votes
1answer
77 views

How to make zonal statistics model more efficient?

I've made this model, to assess some 500-600 rasters for one area, and spit out one huge table. So far, when testing it with 20-30 rasters as inputs it works, but now that I put in the full amount its ...
4
votes
1answer
113 views

How are raster pixels determined whether they are in or out of a zone?

I just needed to confirm something that I think I already know the answer to because help pages are always unclear. I am running ArcGIS 10.2.2 and often use the Zonal Statistics and Tabulate Area ...
1
vote
1answer
42 views

Including NoData zones in zonal statistics table

I am running the zonal statistic tool on a raster with a shapefile that consists of several regional polygons. I would like the zonal statistic to include the regions that are completely NoData in the ...
4
votes
1answer
46 views

Zonal statistics discrepency between Arc 10 versions

I've discovered a weird phenomenon using zonal statistics with a colleague at another office. We are attempting to use the Zonal Statistics as Table tool to sum the value of raster cells within ...
4
votes
2answers
607 views

Zonal statistics for millions of overlapping polygons

I am running ArcGIS 10.1 with 64-bit GP on Windows 8.1 x64. I want to calculate the zonal statistics of buffer polygons based on parcels and a kernel density raster. The 4.7 million polygons overlap ...
4
votes
1answer
171 views

Is there an issue with Zonal Statistics calculating wrong mean values?

I tried to solve the following issue by myself but without success. On the one hand I have a raster file which is the result of the processing "shapes to grid" tool. On the other hand I have a ...
2
votes
1answer
84 views

Intersect shapefile with raster, then determine proportion of each raster value?

Using the arcpy module in Python, I want to find the proportion of each pixel value within the boundary of an overlaying polygon. (The polygon is in a shapefile.) For example, there are 10 possible ...
1
vote
1answer
57 views

Overwrite option on a standalone ZonalStatisticsAsTable using ArcPy

How can I code an "overwrite option" on a standalone ZonalStatisticsAsTable using ArcPy? I don't see any overwrite option from a Esri example. # Execute ZonalStatisticsAsTable outZSaT = ...
1
vote
1answer
154 views

Export “Zonal Statistics As Table” output in Modelbuilder

I have an extremely simple model that takes as input a shapefile for zones along with a value raster. All the model does is produce a table of my desired zonal statistic for each zone (the mean). ...
2
votes
3answers
142 views

Zonal Statistics as Table Tool

I have a slope dataset. I have a polygon shapefile with territory within the extent of the slope map. I have to calculate the real surface area of this shapefile using the zonal statistics as table ...
1
vote
1answer
236 views

Calculating real surface area using Zonal Statistics as Table Tool?

I have a slope dataset. I have a polygon shapefile with territory within the extent of the slope map. how do I calculate the real surface area of this shapefile using the zonal statistics as table ...
0
votes
2answers
91 views

Calculating Centroids with Zonal Geometry in ArcGIS

I have a shapefile containing polygons. Each polygon is defined by its postal code. I want to calculate the centroid of each polygon using Zonal Geometry. Sadly, for some polygons there are no ...
0
votes
0answers
83 views

Overlaying Line (Vector) Layer on Raster Zones?

I will make my best attempt to clearly explain my problem. I am using ArcGIS 10 I have a raster layer with 3 values that make up zones. For the purpose of this example, lets say these zones are ...
0
votes
0answers
37 views

Zonal statistics vs. random points?

Using ArcGIS 10.1 for Desktop, I wish to model the relation between soil productivity (SP) and a number of independent variables such as, e.g., terrain elevation and slope. For this purpose, I am ...
1
vote
0answers
113 views

Batch Zonal Statistics to Spreadsheets?

I have a pretty immense amount of Zonal Statistics as Table computations to do, and would love to find a way to grab mean and variance values from the little .dbf tables ArcGIS creates and put them ...
2
votes
0answers
58 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 ...
0
votes
0answers
97 views

What does “unsupported bin funcion type” error in ERDAS mean?

I want to open a set of .img files in ERDAS which are output files of zonal statistic function in ARCGIS. Before running the function, all images can be opened in ERDAS. After calculating zonal mean, ...
1
vote
0answers
142 views

Problem with polygon overlay in raster stats using gdal

I am using the raster_stats module in python to calculate the mean carbon value for different sets of polygons. Here is the code that I am using: africa_sat = ...
2
votes
1answer
84 views

How to loop qgis:zonalstatistics using Python?

I'm looking for some Python + QGIS foo for the following: import processing for i in range (1,20): processing.runalg("qgis:zonalstatistics", "/folder/input/raster.tif",%i, ...
3
votes
1answer
223 views

Getting Zonal Statistics of Overlapping Circles?

I have a Buildings (polygon) shp file and a DSM. what I wanted to do was to get the pixel values for all the vertices of those buildings, and find another pixel value just around those vertices (say ...
1
vote
0answers
92 views

Determining average rainfall for cumulative watershed, where only sub-watersheds defined?

I have a polygon layer with sub-catchments (sub-watersheds) and a grid of rainfall. I have used the Zonal Stats as a table to calculate the average rainfall for each sub-catchment, but I now need to ...
1
vote
1answer
266 views

How to create graph out of two layers using ArcGIS 10.1 for Desktop?

I would like to create a graph of two layers I have. on one hand its the land price of a certain area and on the other a layer with a crime rate. first of all, the layer with the land prices doesnt ...
2
votes
0answers
78 views

Zonal Statistics Freezing QGIS 2.2

Running on Windows; 8gb memory, 500gb HD, i5 cpu; Raster file: 250mb I am having a problem with zonal statistics advancing past 17%. I am trying to run statistics on a crop grown in certain counties. ...
1
vote
1answer
193 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 = ...
0
votes
0answers
56 views

Why does it take so long to run zonal statistics?

QGIS 2.0 Windows 7 I have pulled agricultural data from NASS CDL in tiff format. I want to track where a certain crop has grown over the years. My intention was to use a county shapefile overlaid ...
0
votes
0answers
113 views

Convert raster_stats list output to array / csv file

I usually program in R, but recently I have started to use python for most of my spatial programming. My python skills are still limited, and please excuse the simplicity of the question. I am ...
1
vote
2answers
86 views

How to calculate raster class metrics by polygon zone?

I have a raster of morphology data where each bin has a code. I want to count the number of each code that fall under a polygon from another file. Zonal stats as table only gives me the min/max ...
1
vote
0answers
352 views

Multiple polygons and rasters for Zonal Statistics as table in ModelBuilder

I have a large number (>17,000) of raster image files that I am creating by iteration. I also have clipped out corresponding polygon files with identical names in a separate folder (maybe not ...
4
votes
1answer
124 views

Any way to perform zonal statistics on column other than value or do reclass faster?

I have to perform ArcGIS zonal statistics on a raster, but the column I am interested in is not the 'value' column. Now, I can reclass the raster so that the column of interest becomes the 'value' ...
0
votes
0answers
61 views

Zonal statistics won't work after re-projecting vector layer

I have qgis 2.0. I want to analyze raster information within a buffer of 30 miles around a vector layer of cities across the world. However, both the raster and the vector are in WGS84. I have no ...