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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Calculate height profile from cogeoTiff using rasterio

I want to create a service calculating height profiles using our CoGeoTiff LaserScan data from Austria. It has a 1m resolution at its deepest level and is about 400GB big. Generating height profiles ...
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Generating high resolution MBTiles in QGIS

Is it option to generate MBTiles file in high resolution (512x512 / 192DPI) in QGIS? Generate XYZ tiles (Directory) tool allows to create high resolution tiles, but in Generate XYZ tiles (MBTiles) ...
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Managing the drop of information when converting/downsampling from vector to raster (QGIS/GDAL)

I need to rasterize my vector (polygon) data to 10m resolution (to match Sentinel's 10m resolution). But as you can see in the picture, the results are bad for small structures like roads etc. Is ...
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QGIS is slow and vectors have low resolution [closed]

I have a new, alright laptop (16GB RAM, nVidia GeForce mx450, 3.3 GHz i7) and QGIS has worked very smoothly so far, even when working with massive files. But recently, quite suddenly, QGIS became much ...
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1 answer
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Sum two partially overlaping rasters in QGIS: auto-detect extent and resolution

I need to sum two rasters (r1 and r2) using QGIS. They're made of 0s and 1s (black/white), and overlap only slightly over a common border. In the overlapping area, r1 has data in part of it, and r2 ...
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Change resolution of SRTM

Currently, I am trying to change the resolution of an SRTM downloaded via SRTM Downloader. Problem is the following: I need it in 1 Pixel Resolution but can't find a working way, either the heightmap ...
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Improving resolution of map using QGIS

I am using QGIS. I have a shapefile of Africa. In that shapefile I divide Africa in cells. After, I graduate all the cells according to one variable (see first picture). I would like to see the entire ...
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Is it possible to define a spatial resolution for a Geometry column in PostGIS?

In various spatial file formats, it is possible to define the spatial resolution (tolerance), for which a vector geometry is saved and treated (Oracle DB, ArcGIS). e.g. if the geometry layer is using ...
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Resampling high resolution binary raster

I have a large, high resolution raster of binary data that I need to reproject and resample to align with a lower resolution dataset. Because the original data is binary, I need to aggregate using the ...
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SRTM resolution increase (~88m to 30m) causes a windowpane check pattern in subsequent hillshade, aspect, slope, etc

I'm working thru QGIS trainings and ran into this: Task is to use both a low-res Rainfall SRTM (32733) and a higher-res DEM/SRTM (4326) to produce rainfall, slope, and aspect layers, combine them, ...
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Specify spatial resolution using Rasterio rasterize

I am converting vector features to raster using Rasterio rasterize(). I am trying to find a way to specify the output spatial resolution. The current approach specifies the number of pixels (shape = ...
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Using higher resolution (10m) labelled land cover image on lower resolution (30m) raster

I want to train a simple CNN model to pixel-wise classify a satellite image into separate land covers. I have the ESRI 2020 land cover data which has a resolution of 10m x 10m for training. I want to ...
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4 votes
1 answer
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Raster resolution

I have a climate model that has 8km resolution and I am not sure what it means, does it mean that every cell is showing an equivalent of 8 km in real life?
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Resize two different resolution classified image in ENVI

I have two classified image. one image classified based on 30 meter resolution image and another one based on 1 meter resolution image. My image base is that 1 meter resolution but the first ...
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3 votes
1 answer
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Improve resolution of WMS in QGIS

Does anybody know how the resolution of wms/xyz-tiles like Google Earth can be improved? In comparison to the original services at the respective Google websites the resolution at higher zoom level is ...
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1 vote
0 answers
13 views

Control resolution of Temporal Controller output

I put QGIS Zurich 3.18 .png files into movie software. (Pinnacle Studio 20). One .png file produced by Print Layout reads fine , other produced by Temporal Controller is illegible, too fuzzy. How do ...
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Pyvips rounding my resolution

I am working with pyvips to test some cropping speeds vs. other packages. I need to access my x and y resolution. I am able to, but for some reason pyvips is rounding to the nearest mm. I opened my ...
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How does Google Earth Engine deal with scaling up/down categorical data?

I read the docs on Resampling and Reducing Resolution and Projections. I sort of get that the scale/projection is determined by the final outcome but I still don't get how categorical data are handled....
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DEM resolution VS Contour generation using ArcMap

I have a DEM which I have added to ArcMap. When I measure the cell size it is 1m. When I try and generate contours it keeps coming out at 10m despite me specifying the spacing as 1m or 5m. I would ...
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Understanding resolution of multispectral satellite imagery (EuroSAT)

I am trying to understand the data that is provided in EuroSAT : Land Use and Land Cover Classification with Sentinel-2. It is comprised of "Sentinel-2 satellite images covering 13 spectral bands ...
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Using two different data sources

I am doing a masters research project for a bank to investigate the impact of rainfall on default rates, default predictors and property valuations. The data I was given has the following attributes: ...
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1 vote
1 answer
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Deep machine learning to improve satellite spatial resolution

Are there currently technologies based on deep machine learning that can improve the spatial resolution of satellite images (e.g. Sentinel-2)? An example of the use of such technology to reconstruct a ...
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Low resolution of imagery in Google Earth Pro

I want to convert an ECW into a format I can load into Google Earth and keep the quality(or at least ok quality, when I convert it to a TIFF or KMZ it is very low res). I am hearing talk about how ...
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  • 113
1 vote
0 answers
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Rotation of raster image in atlas using QGIS [closed]

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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1 answer
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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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0 votes
1 answer
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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. ...
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29 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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0 votes
1 answer
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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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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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1 answer
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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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1 vote
0 answers
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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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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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1 vote
0 answers
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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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1 vote
0 answers
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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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1 vote
1 answer
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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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6 votes
1 answer
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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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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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1 vote
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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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2 votes
0 answers
78 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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2 votes
1 answer
297 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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1 vote
0 answers
43 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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0 votes
2 answers
322 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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1 vote
0 answers
98 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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0 votes
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247 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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1 answer
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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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1 vote
1 answer
308 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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  • 473
4 votes
1 answer
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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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1 vote
4 answers
334 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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141 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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0 votes
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54 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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