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.
344
questions
32
votes
7
answers
79k
views
Spatial resolution of Google Earth Imagery
What is the spatial resolution of imagery used in Google Earth? At various places on the web, I have been reading it varies from place to place - 60 cm, 2.5 m, 15 m and so on. I was wondering if there ...
- 4,819
26
votes
5
answers
12k
views
Obtaining print quality PDF or PNG output from QGIS?
I work with people who use ArcGIS Desktop and they have found the best resolution output images are made by creating PDFs. They tell me that *.png and the rest out of ArcGIS Desktop are not ...
- 1,772
19
votes
1
answer
7k
views
Resampling to highest or lowest resolution when dealing with rasters of varying resolutions
I'm looking for recommendations on best practices for dealing with raster data layers with different resolutions and projections. The advice I've been given is to always resample to the layer with the ...
- 1,831
17
votes
2
answers
13k
views
Snapping raster grids in R
I am trying to align two raster grids in R. Once aligned I would like to be able to add them together.
I have tried to check whether making a stack would work:
grid_snap <- stack(habi_sdw, ...
- 311
15
votes
1
answer
28k
views
Using resample vs. aggregate & extend in R to have rasters of matching resolution and extent
I have two rasters of different resolution and extent:
> res(Elevation)
[1] 0.002083333 0.002083333
> res(Ann_precip)
[1] 0.008333333 0.008333333
> extent(Elevation)
class : Extent
...
- 567
13
votes
2
answers
8k
views
Reduce the resolution of a shapefile in R (or QGIS if necessary)
I'm using shapefiles of history U.S. state boundaries from NHGIS to make maps in R. These shapefiles are much higher resolution than I need when making maps at the scale of the country: over 2 million ...
- 687
10
votes
6
answers
7k
views
QGIS on UHD screen
I've got a new laptop that came with a 4k UHD screen. The GUI on QGIS doesn't scale well making most of the menu elements too small to easily see.
Is there a way to change the scale of the gui?
- 1,014
9
votes
4
answers
2k
views
Precision vs Resolution in elevation data
Update:
A good example of something I am confused about: on the Wikipedia page for "digital terrain model" one can find the following statement about a satellite in the "See Also" section:
TanDEM-...
- 429
9
votes
1
answer
10k
views
Calculating bounding box by given center and scale in Android?
Given these conditions:
a scale like 1:50000
the center of the viewport is 100°E, 20°N
the size of the viewport is 400x600
How can I calculate the bounding box of the viewport?
The geographic ...
- 953
8
votes
2
answers
6k
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). ...
- 711
7
votes
4
answers
12k
views
DSM resolution reduction in QGIS
Does QGIS - through one of its rich algorithms library - allow for reduction of raster DSM/DEM resolution?
I want to speed up the analyses and reduce effect of detailed raster on results readability.
...
- 443
7
votes
3
answers
14k
views
Stack rasters with different origin, dimensions and resolution in R
I have three raster files with the same extent and CRS, but with different origin, dimensions and resolution.
r1
class : RasterLayer
dimensions : 3020, 3043, 9189860 (nrow, ncol, ncell)
...
- 73
7
votes
2
answers
3k
views
Downsampling Geotiff using summation - Gdal/Numpy
I am trying to downsample a 1 square km raster dataset to a much larger (.5 degree x .66 degree) dataset by summing all of the pixel values within this large grid cell.
gdal_warp does not contain a ...
- 173
7
votes
1
answer
7k
views
How to export the map in very high resolution
I made a map in QGIS.
Now I want to export the resulting image (layers upon layers) for further processing in GDAL.
The print composer only lets me export an image up to a fixed size. If I try to ...
- 10.8k
7
votes
2
answers
7k
views
Change the resolution and size of a raster with GDAL in Python
I am quite new to GDAL and Python but want to use it to create groundwater models in FloPy.
I have a raster with rivers (roughly drawn) and a DEM raster. The resolution of the river-raster is higher ...
- 111
7
votes
2
answers
5k
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 ...
- 121
6
votes
3
answers
11k
views
Resizing image resolution in ArcGIS Desktop?
I have NDVI images (250 m) and Soil map (1000 m).
How can I change the resolution from 1000 m to 250 m, so I can compare/work with them?
- 579
6
votes
3
answers
3k
views
What is the highest resolution of population density data that I can obtain for USA freely?
Ok so as far as my understanding goes the most high resolution dataset available that factors in many other things (other than Census data ) at a 1X1 km resolution is Landscan data created by Oak ...
- 1,233
6
votes
2
answers
2k
views
Why does the resolution decrease with increasing incidence angle in the Sentinel-1 SAR sattelite
On this link (Sentinel1 webpage for a SLC product), the resolution is written as a range from the highest corresponding to low incidence angle, to the lowest resolution corresponding to high incidence ...
- 956
6
votes
1
answer
10k
views
How can I compute raster pixel width and height given raster bounds, row count, and column count?
Restated, how do I convert arc degrees to meters? For example, I have an elevation data raster that has the following metadata:
WEST LONGITUDE=64.97798789° E
NORTH LATITUDE=33.02003415° N
EAST ...
- 341
6
votes
2
answers
5k
views
Difference between Ground Sampling Distance and pixel size in RapidEye
I am a bit confused about reading technical specifications on RapidEye satellites. I assumed that Ground sampling distance (GSD) and pixel size express the same meaning, while GSD is 6.5 m, and pixel ...
6
votes
1
answer
3k
views
How do I get GDAL_translate to output better resolution
I have a set of GeoPDFs that I converted to GeoTiffs. However, the end results are horrible. They are very pixelated. The command I passed was
gdal_translate -of GTiff inFile outFile -co COMPRESS=...
- 355
6
votes
2
answers
10k
views
Merging Raster Datasets of Different Resolutions using ArcGIS Desktop? [closed]
I am using ArcGIS Desktop.
I have two DEMs in .tif format and I am looking to merge the two. The main problem with merging these are that they are different resolutions (one is 10m and one is ~20m). ...
- 830
6
votes
1
answer
3k
views
Clip raster by raster with data extraction and resolution change
I need to stack multiple maps (tif) together and clip them all according to extent of one small raster map (second raster at the top of picture below). However, the size of pixels in each map is ...
- 267
6
votes
4
answers
6k
views
Exporting to .eps using QGIS
According to web posts from a few years ago, exporting to .eps was easy with QGIS. Just choose : Export as image --> select .eps type. However, I do not find that functionality in the current ...
- 1,927
5
votes
2
answers
3k
views
Basemaps provided by Esri
I have a general question for those who use Esri software: Is there a big difference between the basemaps available for QGIS and those provided free by Esri to its customers? I tried to use the Esri ...
- 648
5
votes
2
answers
28k
views
How to calculate pixels per meter ratio, according to Google or Bing map zoom level?
I have an image and detect two points in the image. I want to calculate the distance between these two points. I'm using Google map and Bing map.
I have
x,y pixel values for both two points
zoom ...
- 51
5
votes
2
answers
936
views
Do shapefiles sometimes contain the necessary data for address resolution?
Right now I am doing address resolution with a ESRI file called Street_Addresses_US.loc which works. I have been given a shape file that contains streets that was compiled by the state. Is it ...
- 2,730
5
votes
3
answers
8k
views
High resolution screen on ArcMap?
I have an Asus ZenBook Laptop with a 3200 x 1800 touchscreen, i tried enlarge icons but the ArcToolBox and other icons not fit on a 13.3 inches display.
Other "more common" apps that do not have much ...
- 51
5
votes
2
answers
3k
views
How to change spatial resolution using gdalwarp?
I just realized that I have Geo-TIFF's in the same coordinate system but different spatial resolution. DOP20 (20cm=1px) and DOP10 (10cm=1px) mix.
Now wanted to use gdalwarp to transform the DOP20 TIFF ...
- 65
5
votes
1
answer
766
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 ...
- 95
5
votes
2
answers
9k
views
What's relationship between pixel spacing and resolution?
Let's take as an example the Sentinel-1 SAR satellite for which data is accessible online.
The pixel spacing in the range and in the azimuth are found inside the xml files bundled with the product. ...
- 956
5
votes
1
answer
3k
views
Calculating Map Resolution Without Pre-Defined Scale Levels
I am trying to determine the formula necessary to calculate map resolution (change in lat,long per screen unit). I am interested in only WGS84 coordinate space.
Every formula I have found thus far ...
- 5,705
5
votes
2
answers
949
views
Can overlays have different resolutions from the base layer?
I am trying to show a regional map on top of base map but without success. While debugging I noticed that my regional map has a different set of resolutions from the base. Is this allowed in ...
- 103
5
votes
1
answer
1k
views
Optimum raster tile size
I am wondering if there is an optimum raster tile size when using -t in raster2pgsql. I am setting -t auto and it creates thousands of tiles and takes hours to load.
I am working with very large ...
- 1,359
5
votes
1
answer
634
views
30m/10m/1m resolution DEM for microtopography research
I am conducting research in a region of Illinois that does not have a LiDAR dataset. I am looking to develop a fine scale habitat species distribution model; however, the coarse data available (30m/...
- 59
5
votes
1
answer
114
views
Determining resolution of specific image in PDF document
Can GDAL be used to determine the resolution of an image embedded inside a PDF? If not GDAL, is there another method?
I'm using gdal_translate to convert TIF+TFW files into geospatial PDF. I know ...
- 316
4
votes
2
answers
3k
views
What does 1:10m mean related to map resolution?
On Natural Earth they offer maps at various resolutions. What does 1:10,000,000 mean? Does it translate to the number of points per square meter or mile?
- 255
4
votes
3
answers
1k
views
What is the difference between DEM data sources?
I have started experimenting creating basic 3D elevation models in QGIS recently. It turned out for me that there are several free sources of DEMs, like USGS's EarthExplorer, CGIAR-CSI's Digital ...
- 1,033
4
votes
1
answer
2k
views
Specifying target resolution when resampling with rasterio
In GDAL warp you can simply set an xRes and yRes value. I'm trying to only use rasterio, but the process seems a lot less clear.
According to the docs https://rasterio.readthedocs.io/en/latest/topics/...
- 689
4
votes
1
answer
216
views
Is LANDSAT 8 Resolution too low for coastline difference measurement?
I recently extracted coastlines (for my master thesis) for a Bangladesh region for the years 2013 and 2014. Regardless of the method I used, the distance between the 2 coastlines was always the same: ...
- 205
4
votes
1
answer
3k
views
File Geodatabase XY Resolution and XY Tolerance
At Limiting XYZ Geometry Drift I found the description of XY Resolution and XY Tolerance in ArcGIS.
My cadastral data in shapefile format have an accuracy of 1 cm. If I want to work with my data in a ...
- 183
4
votes
1
answer
832
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....
4
votes
1
answer
564
views
ArcMap blurry after update from 10.4 to 10.5
I had to recently update ArcGIS from 10.4 to 10.5 because of a new license.
In the new version everything looks a little "blurry".
All other programs (Word, Excel etc) look fine. Even in ArcMap the ...
- 343
4
votes
2
answers
3k
views
Resample, ArcGIS: How do I avoid resample taking into acount NoData values?
I am trying to Resample a raster dataset to match the resolution of another dataset. I have fine resolution data on small islands (surrounded by NoData in the sea). When I re-sample the data to a ...
- 41
4
votes
1
answer
3k
views
Merging raster data with different resolutions
I need to merge different raster datasets which have one layer and contain discrete values to a layer stack.
The resolutions of the data can have any value so not only multiples of the resolutions ...
- 71
4
votes
1
answer
2k
views
Dimensional analysis/conversion problem: Map scale to image resolution (dpi)
Given a map scale of 1:17,200 and a raster whose cell size is 6 inches, what resolution (dots per inch) should I choose when exporting the map to an image in order to maintain the raster's native ...
- 35.8k
4
votes
1
answer
102
views
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?
- 41
4
votes
2
answers
614
views
Resolution difficulties in Grass
I have gone through similar questions to mine here, but I didn't find a solution. Please help!
When cropping a raster image by using g.region & r.mapcalc, I get a new image but the resulting ...
- 55
4
votes
1
answer
1k
views
Cannot upscale raster with rasterio
I am trying to upscale a raster using rasterio but I don't know why my process gets killed.
It can print "i am arrived here" but on the reproject() I have as terminal output:
killed
This is the ...
- 573