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Questions tagged [cell-size]

Cell size, also know as resolution, is the size of each individual cell, or square, on an image.

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How to calculate the area of each grid cell of a raster in Python?

I have a square raster of size, let's say, 100x100 cells, with each cell being 200m X 200m. This raster is not in an equal-area projection, but is centered on the North Pole, meaning the actual area ...
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python: GDAL raster output is distorted

I'm trying to understand why my multiband raster output created with GDAL is distorted. Short summary: I got several hundreds of US counties data in csv format. For each one, I need to convert the CSV ...
Andrei Niță's user avatar
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QGIS - keep square pixels in resampling

I have a raster file (asc) with a resolution of about 10m, square pixels and an extent of X: 15929 Y: 16159. I am trying to resample this to a larger resolution (tried 20 and 30m). However, the output ...
etna_2605's user avatar
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Calculation surface area for every cells [duplicate]

Surface area= Plan area /cosine (in Radian) slope. I used cell plan area by multiplying cell size for example 12,5*12,5=156,25square meters Surface Area = 156,25/cosine slope result became surface ...
Mojtaba's user avatar
3 votes
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Identifying cells overlapping in multiple rasters using QGIS

I have a range of forest raster TIFF files over a 10 year period, and want to create a fresh raster of locations where it has been forest for 3 or more years. I know I can merge them into a multi-band ...
Ashley Wild's user avatar
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107 views

Rectangular cells versus square cells, is there some advantage?

I would say 100% of my work involving rasters is with rasters where the cell shape is square, e.g. 30m by 30m. I recently received some NetCDF climate data and when I used ArcMap to visualise the ...
Hornbydd's user avatar
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Snap Raster and same cell size still lead to slight differences between rasters

I'm working in ArcMap 10.6.1, where I've been trying to make the cells of two rasters (let's call them raster A and raster B) line up perfectly with each other using the Snap Raster and Cell Size ...
stijnionio's user avatar
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Way to determine cell size of a shapefile

I am using the Point to Raster tool in ArcGIS Pro to turn my shapefile in to a raster. The automatic cell size used (pre-defined by ArcGIS Pro) is 8.1m - this gives me a low resolution output. With ...
dabba293's user avatar
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Determine best cell size for vector dataset based on provided info from ogrinfo

I have been using ogrinfo to obtain information regarding my Bathymetry dataset shapefile with the results as follows: Layer name: TEST Metadata: DBF_DATE_LAST_UPDATE=2022-03-30 Geometry: 3D Point ...
fuzzy_raster9873's user avatar
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Zonal Statistics and output cell size

I am trying to use Zonal Statistics to find the most common value of a high-resolution classification within a coarser fishnet grid (10x10 m). The idea is to use this high-res classification as ...
stijnionio's user avatar
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Alter Gdal_Grid output cellsize

I have a shapefile containing xyz bathymetry points. I've been using ArcGIS Pro Point to Raster tool where I have specified: Input: input.shp Value Field: Z Output: output.tiff Cell Assignment: ...
user_map1236's user avatar
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635 views

Calculating cell size of DEM in QGIS

I am using the following raster calculation to create a topogrpahic wetness index in QGIS. TWI/CTI = ln(a / (tan (beta)) where; a=Upland contributing area: [(flow accumulation + 1 ) * (cellsize)] ...
ryoung's user avatar
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Verification of map scale

A map provider says on its webpage that the ground resolution (respectively pixelsize) is 0.2m x 0.2m. The WMTS-Capabilities document states on the highest zoom level (ows:Identifier 16) a scale ...
theDrifter's user avatar
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LAS Dataset to Raster tool not allowing resolution of window size in Triangulation interpolation to be manually chosen using ArcGIS Pro

I'm working on a workflow to convert a LAS file into a raster to calculate a bare earth model for drone surveys (~300m x 300m with a point density of ~1.5pt/cm^2) using the LAS Dataset to Raster tool. ...
mhnewton's user avatar
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130 views

When saving an ASCII grid as a GeoTIFF in QGIS, the resulting raster has slightly different cell values than the input file

My input raster is a Arc ASCII grid that I drag into QGIS. It has a cell size of 1. If I try to convert that to a GeoTIFF by going Export>Save as> GeoTIFF, and using the same extent and cell ...
Karyn's user avatar
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QGIS raster size is different from size in file?

I created a GeoTIFF file with size 3600x3600, I verified that the file I have on harddrive is indeed 3600x3600. But the raster size that QGIS displays is 4554x2277. This makes the raster sum wrong, (...
user3785097's user avatar
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1 answer
114 views

SAGA RESAMPLING SYNTAX

How can I solve the problem shown below: I am trying to build a plugin that allows me to resample the raster data to any desired resolution of my choice with 20 being the minimum input value, as ...
De Falasy's user avatar
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262 views

Resampling for cellsize when exporting raster to GeoTIFF - GM

I used Global Mapper v20.0 for exporting the raster image GeoTIFF (32bit, from cellsize x= 0.008333333333000000898 arcdegree, y= 0.008333333332999999163 arcdegree) to cellsize x= 0....
Suesy's user avatar
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Equalize number of columns and rows number with different raster data which was taken from different sources

I am interested in creating a flood map using machine learning methods. I need the same number of columns and rows for each raster data or layer. However, although I used the same boundaries for ...
Ogun Barutcu's user avatar
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119 views

r.walk issues in GRASS

I have been doing the r.walk analysis but fail to generate the result. The movement direction map and walking cost map from stop points is extremely small, limited to a 3x3 or 5x5 square. Does anyone ...
Zac's user avatar
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2 answers
611 views

What cell size do I use when the raster cell size is larger than the zonal vector features for Zonal statistics as table tool?

I want to calculate the mean precipitation from a PRISM raster for a land use data layer using the Zonal statistics as table tool for ArcGIS 10.7. The land use vector layer contains over 20,000 ...
kent 's user avatar
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ArcGIS Polygon to Raster cell size issue

I am trying to convert a polygon to raster and I noticed that the cell size of the resulting raster appears different for different coordinate systems, despite me setting the cell size the same. Both ...
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Viewshed: why does a larger input cell size result in a larger viewshed area?

At Arc Desktop 10.7.1 I am conducting a viewshed analysis using the Viewshed tool. I am trying to understand how the input raster cell size affects the area covered by the output viewshed raster. ...
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Raster pixel size in QGIS automatically defaults to square

I am using QGIS 3.4 and my data consists of rasters with irregular cell sizes. In ArcGIS Pro, the cell sizes are maintained (screenshot below). However, when I upload the same raster into QGIS, ...
Anna's user avatar
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1 vote
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118 views

Non-square raster pixels created during TIN Interpolation?

I am trying to create a raster by using the TIN Interpolation tool in QGIS. I'm using a 3D polygon shapefile as input. I'm looking to create a raster of square pixels, although despite specifying a ...
Jen MacD's user avatar
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1k views

How to change raster cell size WITHOUT resampling? (ArcGIS Pro)

I have hundreds of rasters, all with different rectangular cell sizes. I need to convert the pixels to be square, since I will be using a variety of Spatial Analyst tools such as Raster Calculator. ...
Anna's user avatar
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1 vote
1 answer
80 views

Specifying grid width and height dimensions with ArcMap custom toolbox parameter

I am using I am writing a script to create a tool (in ArcMap 10.7.1) that involves overlaying an agricultural field with a specific grid size. I need the grid to contain a custom width and height of ...
ihb's user avatar
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Create a grid in R, change in cell size displaces position of grid

I'm writing R script which will allow users to overlay a grid on their data in a new projection with the option of defining the size of the grid cell. This seems to work fine, however, when I plot two ...
bfin's user avatar
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453 views

Batch process aligning multiple rasters in QGIS

I would like to know if there´s a way to run a batch process that consists in aligning (changing cell size from 10 to 20 in Sentinel 2 imagery) in QGIS 3.4? I need to resample band #8 (resolution 10m)...
estebancf28's user avatar
1 vote
0 answers
511 views

Find closest points using S2, given point and radius

I'm trying to use the go s2 package to find closest points, given a point and a radius (meters). I'm modeling my alg. after dynamodb-geo.js as I'm storing my points in DyanmoDB. I can't seem to get ...
rynop's user avatar
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2 votes
1 answer
377 views

Sum multiple rasters using raster calculator, the result raster had a larger cell size?

I have 365 rasters (daily) and therefore I summed them to form an annual raster using raster calculator in Arcgis. The original cell size of daily raster is 5*3.75 (col 72, row 48), while the cell ...
Jianxing_Zhu's user avatar
1 vote
1 answer
218 views

Cell size issue with Landsat data

I have calculated a temperature map from Landsat Image. This map is correct but I the cells can be seen obviously. I have changed the cell size from 30m to match my other products which are 1m. I used ...
Paris's user avatar
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3 votes
2 answers
1k views

Determine area of cell in raster (QGIS)

I have a raster layer of which I would need to find the area (m2) per cell. Any suggestions for a simple approach to achieve this?
A.N's user avatar
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2 votes
1 answer
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How big is a MODIS 250m pixel in reality?

How big is a MODIS 250m pixel in reality? This appears to be a question that contains its own answer, but I have several reasons to doubt that the pixel size is actually 250m x 250m: I downloaded ...
John's user avatar
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-1 votes
1 answer
252 views

Cell Size Discrepancy When Exporting TIFFs Using QGIS?

I am using QGIS Madeira 3.4.3. I am downsampling 100m TIFFs to 1000m. I am using Export - Save As GeoTIFF specifying cellsize 1000m, and the appropriate No Data value. This works just fine with the ...
Doug H's user avatar
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1 vote
1 answer
2k views

Extract Raster Information using Python

I would like to extract raster information (i.e. coordinate system, cell size) to excel file using python, how can I do that?
penguin's user avatar
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1 answer
313 views

Clip to mask layer not adhering to expected width and height following CRM and resolution changes

I am attempting to take a simple opentopo heightmap and carry out the following in QGIS 3.4.1 - Reproject to UTM 31N - Set cell size resolution to 5mtr - Clip to a shapefile polygon feature exactly ...
Rossoe's user avatar
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0 votes
1 answer
180 views

Change cellsize of ArcInfo Grid ASCII data

I have a ArcInfo Grid ASCII file of Turkey with cellsize 0.000833333333 (3 arc second ~90m for equator and ~83m for Turkey, I've learned so far), Can I just simply change the header value to 83m or is ...
Ahmet Orhan's user avatar
1 vote
1 answer
385 views

Converting proximity from PIXEL distance to GEOmetric distance in QGIS

I used the Raster>Analysis>"Proximity (Raster distance)" tool in QGIS in order to create a raster of distances to a particular value in another raster. This is the same sort of thing someone might do ...
jac's user avatar
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4 votes
1 answer
5k views

Changing cell size of raster in QGIS during extraction (clip)

I want to be able to tweak a raster to be exactly 1mtr cell size during export to bmp or tif. at the moment it's approx 1.19 In Global Mapper the process is clear - I would just simply change the '...
Rossoe's user avatar
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0 votes
1 answer
1k views

Change pixel size of MODIS in GEE

I am trying to perform some scale-tests with some data on GEE. I have the following code where I use the MODIS-NDVI dataset at 500m. What I want to do, is to perform the same analysis but on 25000m x ...
geo_dd's user avatar
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1 answer
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Is the cell size dependent on the number of features for the Euclidean Distance tool?

I have attempted to run the Euclidean Distance tool, using ArcMap 10.5.1, on a feature class of 50 points (hospitals), but I received an invisible output. Using 'Identify' I get 'NoData' for the pixel ...
Ryan Stephenson's user avatar
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0 answers
92 views

Extraction by mask using a polygon changes the cell counts on each category?

I am attempting to use Extraction by Mask on a raster set (land use) to gather the cell counts of each category. The data is from a county level and the polygon I am using is a specific city within ...
Jim Gee's user avatar
7 votes
2 answers
3k views

Cell Statistics calculation in QGIS

Cell Statistics in ArcGIS will calculate the mean (or statistic of choice) among multiple rasters on a cell-by-call basis. Can QGIS do this and, if so, how?
Tom C's user avatar
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