Questions tagged [average]
The average tag has no usage guidance.
31
questions
0
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1answer
24 views
How do I calculate average depth of a 250m square using points at 125m spacing using QGIS
I have a set of points spaced at 125m intervals across an area, an average depth value is assigned to each point.
I need to calculate from these points a single average depth value for a 250m square, ...
4
votes
1answer
55 views
Error in r: “mean” is not a valid subset when averaging over years in a raster
I am using a moving window average to estimate change between historical climate (here, a 36-year average for a period) and the moving window averages of climate into the future. Each moving window ...
1
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0answers
28 views
GDAL - average and mode resampling
I could not understand the source code of GDAL. The task is to understand and implement the above resampling algorithms for images.
What is the main idea of average resampling in GDAL? Official ...
0
votes
1answer
49 views
Aggregate data from several polygons into one in QGIS [duplicate]
I am using QGIS 3.10.1, and I am trying to aggregate Census data (polygons) according to another set of polygons (neighbourhood areas that I have drawn). While I am able to clip the Census data to ...
2
votes
1answer
44 views
Tabulating average value through spatial join in QGIS
Previous ArcGIS user and have now switched over to QGIS for a project. I am performing a spatial join of two shapefiles - one of census tracts and the other of zctas. In ArcGIS you can set the merge ...
0
votes
1answer
53 views
Calculating monthly averages from daily precipitation data
I have a raster brick for daily precipitation data and I need to convert it to monthly data, how would I go about doing this? Each layer is a day and there are 34698 days (i.e. too many to go through ...
0
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0answers
14 views
Code for Extraction of pixel values post Temporal Averaging
I tried to write a code for temporal averaging the pixel values of VH polarization from Sentinel 1 collection and downloading the same as a CSV. I get an error "VH value not selected in the ...
1
vote
1answer
32 views
Creating composite raster from rasters with different spatial extent without losing information using ArcGIS Pro
I am creating a composite raster using several individual rasters with different spatial extents (captured from different times), see image below.
The idea here is that I want to create one mosaic ...
0
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1answer
362 views
How to calculate mean for multiple raster files and multiple variables using R
I have a folder with multiple raster files (.asc) which contains the biomass of different fish species (e.g., Anglerfish, Bathydemersal etc) for different years (e.g., 00012, 00024, 00036 etc)
I want ...
1
vote
1answer
27 views
Binning of satellite Level 2 data
I can see that for the Aqua instruments (AIRS, MODIS, CERES etc), the Level 2 data are binned into Level 3 data providing average values for (say) a 1° x 1° cells grid.
Let's say that I would like to ...
1
vote
1answer
29 views
Calculating average of values in raster in QGIS?
I want to get the average of values in a raster. How do I get this using Raster Calculator?
I was looking for this kind of function: AVE("yourraster@1") in the raster calculator.
1
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0answers
42 views
Fit a line to 3 spatial points
I have a set of lon/ lat coordinates that locates lines. Each line is characterized by 3 points, the start, center and end which were measured using a handheld GPS. Since the individual coordinates ...
0
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0answers
29 views
Get daily composite in GEE [duplicate]
I am interested in getting a daily composite from the GEE S5P TROPOMI NO2 dataset for 01-01-2019 to 01-01-2020. How do I get a mean image for each day?
// Fetch a NO2 data.
var NO2 = ee....
0
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0answers
106 views
Calculate moving average (low pass filter) using fft in GRASS
I am interested in calculating a moving average for a raster in GRASS/QGIS. In other words, each cell needs to receive as value the average of its current value and the neighboring cells in a square (...
-1
votes
1answer
152 views
Calculating daily average using hourly data in Google Earth Engine
I want to get daily data such as net radiation, sensible heat flux and latent heat flux. NOAA NWS National Centers for Environmental Prediction (NCEP)[ee.ImageCollection("NOAA/CFSV2/FOR6H")] ...
2
votes
1answer
255 views
Tool in QGIS to Get Area Weighted Average
I am looking for a tool that can give me an area-weighted average.
I have a shapefile of parcels and another shapefile with Curve Numbers. I want to get Area Weighted CN for each parcel. If I do it ...
0
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0answers
26 views
GRASS r.statistics method=average for non-integer maps
I need use the functionality of r.statistics using the average method. I have one map with cell clumps for a base layer and another containing various non-integer cell values for a cover layer.
...
2
votes
1answer
55 views
Finding average distance to nearest point
I would like to find out the average distance from high schools (represented as a point in QGIS) to libraries (represented as another point in QGIS) in New York's 32 districts.
I have already ...
3
votes
1answer
1k views
Calculate statistics for rasters with multiple bands (600) in QGIS
I am a new user of raster layers in QGIS.
I need to generate a new raster file with the average value for each pixel, from a raster file with 600 bands. The average has to be calculated from all the ...
2
votes
1answer
344 views
QGIS: Creating average of a precipitation multiple raster set?
I have a set of 12 precipitation raster layers downloaded from WorldClim, each one representing monthly precipitation data on a global scale. I've clipped all 12 layers with the area of interest. How ...
1
vote
0answers
34 views
Band rerendering netcdf file by variable not time. Using gdal, nco, cdo
I want to average netcdf data (band1: precipitation) in bins (i.e. 0.01,0.10,0.25,0.5,0.75,1.0, etc.). What nco, gdal, or nco tools can I use to regrid the netcdf file this way?
1
vote
1answer
58 views
Average of specific pixels
I have a raster of estimated soil moisture values and 30 points of field measurements.
I wanted to correlate the measured and estimated values using scatterplot but the result in not good. There ...
1
vote
1answer
486 views
Weighted mean of raster by polygons in R?
I have two rasters, raster_a and raster_b, and a shapefile, world_shapefile. Both rasters are of the world extent and overlay each other.
What I want to do is to create a weighted average of raster_a,...
1
vote
2answers
90 views
Missing values when calculating mean
I have uploaded a table containing information on river basins within countries (https://code.earthengine.google.com/?asset=users/basins/TFDD_BCU). I want to calculate the mean population density in ...
1
vote
1answer
69 views
Mean values from a table in Earth Engine
I have uploaded a table containing information on river basins within countries (https://code.earthengine.google.com/?asset=users/basins/TFDD_BCU). I want to calculate the mean population density in ...
2
votes
1answer
88 views
Computing the harmonic mean of an image collection in the Google Earth Engine
How can I compute the harmonic instead of arithmetic mean for a series of images in Google Earth Engine? There is a build-in function to compute the arithmetic mean and median, but there is no ...
1
vote
1answer
179 views
Calculating meshes average within boundary?
I have mesh data of elevations. Each mesh has a value of elevation (e.g. 87, 60, 33, ...).
And I also have data of administrative boundaries.
I want to calculate the average of each administrative ...
0
votes
0answers
48 views
Polygon interpolation neighbour average?
I am trying to estimate empty values based on a polygon layer we received from another study. Is there a way to calculate an average value for polygon A based on neighbours B,C, etc that border it?
I ...
4
votes
1answer
323 views
Weighted Average of Band Based on another Band in Image Collection [Google Earth Engine]
Using monthly VIIRS data, I'm trying to estimate a weighted average of radiance where I want to weight by the number of cloud free days. Each image in the image collection has two bands: "avg_rad" ...
1
vote
1answer
473 views
GEE: apply ee.Reducer.mean to a list
After classification of an image in GEE, I got 2 lists of user's and producer's accuracies (1*7 and 7*1 dimensions). How can I calculate an average value for each of them now?
print('Validation ...
2
votes
0answers
218 views
How to smooth a classified raster layer in QGIS?
In QGIS 3.0.2, I want to smooth a reclassified raster layer by r.neighbor tool. In this process I use average operation. The raster layer created from this tool is empty. I tested this process with ...
