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Questions tagged [resolution]

Resolution is a measure of the smallest unit or sample in data that can be distinguished from any other, and/or the number of samples for a given unit.

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17 views

QGIS: Rotation of raster image in atlas

I am currently dealing with a mind-numbing problem. I am creating an atlas that has photos as a part of it. The images are loaded through an attribute with relative link. Everything loads just fine. ...
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1answer
15 views

Train SVM at higher spatial resolution than the data that is to be classified?

I want to use support vector machines to classify landcover of a raster image and compare the results for different spatial resolutions. I will simulate the coarser spatial grain by aggregating ...
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1answer
27 views

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. ...
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20 views

Customizing factor in aggregate tool in ArcMap

I have a raster of 30m cell size, with either value 0 or 1. I try to aggregate this into a 1000m cell size. I can then see the proportion of '1's, in a 1000m cell size raster. But the Aggregate tool ...
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52 views

Resampling Sentinel-2 bands (reduce resolution :10m) to 20m resolution in Google Earth Engine

I am trying to reduce the resolution of 10m bands (B2-4,B8) to 20m resolution so that I have uniform resolution for all bands I want to use. I tried a solution provided by Jepson Nomad for similar ...
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38 views

What process does QGIS use when re-exporting rasters to a lower resolution? [duplicate]

I've been re-exporting some 300m-resolution rasters in QGIS to 1000m resolution. I first re-export the rasters to EPSG:5880 so that the units would be in meters, then I re-export the raster to 1000m (...
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1answer
42 views

Euclidean distance outputs incorrect

What I am ultimately looking for is a raster file, with a value for each cell stating the minimum distance to any water feature in my study area. For this I am using National Hydrography Dataset ...
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16 views

QGIS merging grid cells together changing resolution from 250x250m to 500x500m [closed]

I want to change the resolution of a grid in QGIS and can't make it work. I have checked the site for similar problems but couldn't find a simple and good solution. My Grid looks like this: and I ...
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25 views

Changing MODIS spatial resolution (from 500m to 5km) in Google Earth Engine

I am using MODIS MCD43A4 in Google Earth Engine. I want to change spatial resolution this product to 1km and 5km. Below my code is working well, but I am not sure I could change the resolution easy by ...
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17 views

How to convert MODIS 500m resolution to 0.05 degree resolution in Google Earth Engine?

I am checking MODIS GPP product in google earth engine and I noticed that the spatial resolution is not matched with our product. Our product is 0.05 degree resolution but, in case of the MODIS GPP (...
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26 views

Output resolution issue for r.forestfrag in GRASS

I've been trying to calculate forest fragmentation index for a 1kmx1km (30 arcsecs) raster using r.forestfrag in GRASS. I was expecting an output raster of the same resolution but the output I'm ...
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1answer
26 views

Is the grid_terrain resolution in the units of the point cloud?

My las tiles are all in a coordinate system that uses US feet, so if the res parameter for grid_terrain() is set to 1, is the output 1-ft resolution? I figured this is the case, but my professor ...
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51 views

What is the difference between Ground Sampling Distance (GSD) and spatial resolution?

In research papers on remote sensing, I see some authors referring to spatial resolution (expressed as pixel/distance) and others to Ground Sampling Distance (GSD) (also expressed as pixel/distance). ...
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57 views

How to convert a higher resolution shapefile to the resolution of another shapefile?

I have a shapefile with ~110,000 grid cells which I want to convert into the same grid cell sizes as in another shapefile with ~27,000 grid cells? Is there a way to do this in QGIS? Details about the ...
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24 views

qgis2threejs viewer showing poor resolution

When I open qgis2threejs in preview mode the resolution of the preview is poor. It used to be very good and would render as you moved around eth preview screen.
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38 views

Decreasing resolution when exporting PDF with plugin in QGIS

I make a QGIS plugin to export PDF. However, the size of PDF is large and it takes a long time to open the file. Therefore, I want to export PDF with a small resolution. How can I change the ...
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59 views

Single numbers for accuracy and resolution for vector and raster data?

This question is meant as a modelling question, not having to do with particular data formats. It was edited to better separate spatial accuracy and resolution (precision). In order to make the ...
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1answer
107 views

OpenLayers custom tileGrid for scanned map image - How to calculate resolutions?

I'm using OpenLayers 3 and attempting to display a layer based on a custom tile grid in a custom projection (EPSG:4202) on a standard projection map (EPSG:3785). The layer is essentially a photo of a ...
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38 views

Georeferencer negative impact on image resolution

I added CRS to my .tif image(it weights 120gb and doesnt have CRS) using QGIS gdal method (Georeferencer). And the result .tif image with CRS (EPSG:4326) weights 70gb and image resolution is much ...
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2answers
129 views

Handling resolution in degrees in R [closed]

I downloaded forest cover rasters from Google Earth Engine with code from MapBiomas in 30 x 30m resolution. However, when operating with the rasters, I saw that the resolution came as degrees: 0....
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39 views

QGIS Export Map as Image with fixed DPI resolution

I use the following option: Exporting map canvas to PNG file using custom plugin created by Plugin Builder in order to get my Map canvas from QGIS straight to PNG format. The problem is, that default ...
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59 views

Resolution of results exported from Google Earth Engine

I use this code to export my classification result from Sentinel2 images in GEE: // Export the results to Drive Export.image.toDrive({ image: result, description: 'Unsupervised Classified Image', ...
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1answer
43 views

QGIS image downloading

I want to download image from QGIS. What should i write in Resolution setting(2 dialog boxes horizontal and vertical)? What do they mean?
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1answer
101 views

Scale and aggregation function in Google Earth Engine export

Given a 30 m resolution Image in Google Earth Engine, I would like to export it to Google Drive at a 1000 m resolution such that within each 1000 m pixel I obtain the sum of the underlying 30 m pixels....
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35 views

Raster with different x and y resolution

I am using Python based script to calculate cell statistics of multiple files in a folder but the output produced has the same x and y resolution Although my input files have different x and y ...
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1answer
164 views

How can I download SOILGRIDS v2 data through WCS in EPSG:4326, keeping (as close as possible) to the native 250m resolution?

SOILGRIDS data are currently available at 250m resolution. The resolution needs to be specified as part of the WCS download request, e.g. (Python MWE from https://git.wur.nl/isric/soilgrids/soilgrids....
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71 views

GEE Python API Resample Image Collection from 3 hr to 1 day temporal resolution

Is there a way to resample an image collection to a different temporal resolution in GEE? I am extracting points from several bands in the GLDAS asset, which has a 3hr temporal resolution. I have a ...
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4answers
137 views

Rescale Sentinel2 data to 8 bit

I need to rescale Sentinel2 data (both lvl 1C and 2A) to 8 bit, because of the requirements of a GRASS GIS module (i.histo.match) that only works with values from 0:255. All the documentation of ...
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88 views

GDAL2Tiles has low resolution quality

I have a project with a bunch of large, high-resolution Tiff images that I will tilling with gdal2tiles and use on Openlayers. Those Tiff images have been taken on a drone. Example: While I tilling ...
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39 views

QGIS Georeferencer Plugin missing compression parameters

I am trying to georeference a rather large PDF. I was successful in doing so without compression. However, when trying to make the map lighter, I added some compression. The options are: LWZ, PACKBITS,...
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3answers
155 views

Decreasing resolution of binary raster layer, but retain specific data using QGIS

In QGIS 3.16.2, I have a binary raster layer in which I would like to decrease map resolution without losing any value = 1 pixels (white in the example). I have tried exporting and changing the pixel ...
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1answer
51 views

Getting unexpected DEM spatial resolution using ArcMap

I have downloaded SRTM DEM 30 m. However, when I displayed on ArcMap, I got a DEM raster with 0.0002777 cell size. How can I solve this problem?
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43 views

How to harmonize two raster of different spatial resolution? [closed]

To harmonize two raster of different spatial resolution, what is most preferred and scientific to do: To make coarse resolution finer or To make fine resolution coarser? The datasets includes: ...
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1answer
21 views

How to adjust the resolution of one raster to the resolution of another raster

I have two rasters, both showing forest cover. I eventually want to use one to mask the other, so I'm trying to get them to the same extent and resolution. I matched the extent by simply cropping one ...
4
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1answer
1k views

Aligning two rasters of same resolution perfectly on top of each other in QGIS

I have two rasters, that I managed to make in the same resolution using the 'Raster tools --> Resampling' tool by SAGA. The pixel sizes are exactly the same, however the new resampled raster, in ...
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25 views

How to change the resolution of NetCDF data and start at a specific point in GDAL

I have temperature data which is in NetCDF format and lat=1801 lon=3600 and I want to convert it to a NetCDF file with lat=360 and lon=720. In other words, I want to change the resolution of my data ...
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1answer
127 views

Why ee.Reducer.sum() and ee.Reducer.mean() get the same value when used in reduceResolution()

I'd like to reduce Landsat image resolution to MODIS. But when I use sum () and mean() reducer, the results are the same. Then I tried using Minmax, mode reducer, surprisingly, they all are the same. ...
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0answers
107 views

Change a raster resolution and size according another raster in QGIS

I have downloaded two rasters set from SoilGrids (like pH, carbon stock... with 250m resolution) and WorldClim (climatic biovariables with 30s resolution). I want to use them in RStudio for Species ...
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1answer
101 views

Converting a Road shp file into a continous Road Raster in QGIS?

I have converted a Road shp file into a Raster in QGIS, however after the conversion the Road is no longer continous (i.e only the cell corners are touching). I have tried increasing the resolution ...
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1answer
57 views

Kernel density estimation for frequency data on polygon level

I would like to make kernel density estimations for a variety of influencing factors on crime, but I do only have frequency data on polygon level, e.g. number of drug markets on county level. For all ...
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2answers
134 views

Making and exporting high resolution (detailed) map in QGIS

My co-worker gives me a map in JPEG format which is exported from ArcGIS Desktop. When I zoomed it, it shows every detail of the map. I am using QGIS and I export a map from QGIS. When I try to zoom ...
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1answer
34 views

QGIS - Exporting a raster layer without smearing individual rasters (so you can zoom)

I've been working with a raster map in QGIS (a shape file made up from squares) and now I'm trying to export it. I want to create an overview map for Germany that allows some magnification to look at ...
2
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0answers
51 views

What is spatial resolution of TROPOMI data in GEE?

In the description of TROPOMI NO2/HCHO data, the spatial resolution is 0.01 arc degree [see following(1)], however the Image Properties says the spatial resolution is 3.5×7.5 km² [see following(2)]. ...
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1answer
196 views

Changing resolution of rasterbrick using R

I have a rasterbrick « env1 » with following informations : class : RasterBrick dimensions : 3008, 2913, 8762304, 8 (nrow, ncol, ncell, nlayers) resolution : 0.00331, 0.00207 (x, y) extent ...
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25 views

How does the resolution of two raster images affect their correlation?

My question is a bit theoretical. Imagine that I have two raster files (raster A and B). Raster A has grid cell size of 1 km and raster B has grid cell size of 100 m. I would like to like to estimate ...
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0answers
22 views

Failing to have visible features in ArcMap 10.5

How do I increase visibility of my map? Feature labels are too tiny and features are too blurred. I am using ArcMap 10.5. I tried to change the resolution to 3000 dpi but still didn't work out. I also ...
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0answers
32 views

Understanding value range for Sentinel-2 images

I have a question regarding Sentinel-2 images. I do not understand how the spectral reflectance values are saved/converted. After the radiometric specification page: The equipment senses the light ...
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1answer
194 views

Getting LiDAR point cloud point spacing using PDAL

I am trying to use PDAL (in Python) to extract metadata from a LiDAR point cloud (.las). I am using the "pdal info" command and applying different flags (e.g. -metadata, -stats) to get ...
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0answers
66 views

Getting image resolution in ERDAS

How can I know image resolution of an image in ERDAS?
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1answer
31 views

Create TIN with modified resolution with arcpy

I have the polyline feature file myfeature.shp from which I create a TIN file: import arcpy arcpy.CheckOutExtension("3D") arcpy.CreateTin_3d("mytin","Coordinate Systems\CH1903 ...

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