20
votes
Spatial resolution of Google Earth Imagery
The resolution of imagery in Google Earth varies depending on the source of the data. When you zoom out, you will see the nice, pretty global coverage produced from a mosaic of many Landsat scenes, ...
- 2,888
16
votes
Accepted
Using resample vs. aggregate & extend in R to have rasters of matching resolution and extent
Check resample function of raster package. When resample is used with 'bilinear method, the output is the same one than aggregate:
if (!skipaggregate) {
rres <- res(y) / res(x)
resdif <-...
- 13.2k
10
votes
Accepted
Basemaps provided by Esri
Both clients - QGIS and ArcGIS Desktop/Pro - are rendering the same information - tiles of imagery, basemaps, etc. So really just images at the exact same resolution, so it has nothing to do with the ...
9
votes
Accepted
QGIS on UHD screen
As @Dave Pitman points out in his answer, that a user, Stu Smith, got the manifest hack to work.
I actually got it to work too. Follow the instructions using the link:
http://www.danantonielli.com/...
- 206
9
votes
Spatial resolution of Google Earth Imagery
Maybe is to late to answer the specific question, but I hope that will help someone else:
To identify a platform the historical imagery of Google Earth (GE):
Turn ON Layers -> More -> SPOT Image OR
...
- 3,386
9
votes
Blurry resolution when uploading DEM 5ft data onto QGIS
You have downloaded a digital elevation model (DEM). The top screenshot is showing a hillshade.
You can either style the DEM as a hillshade or create a hillshade.
Style F7:
The same layer with ...
- 68.9k
8
votes
Accepted
Stack rasters with different origin, dimensions and resolution in R
You can use projectRaster() to resample to a new resolution (also extent and CRS):
r2resampled <- projectRaster(r2,r1,method = 'ngb')
r3resampled <- projectRaster(r3,r1,method = 'bilinear')
...
- 13.2k
8
votes
Accepted
What is the difference between Ground Sampling Distance (GSD) and spatial resolution?
In remote sensing, ground sample distance (GSD) refers to the dimensions of a single pixel in an image as measured on the ground. The calculation of GSD uses the focal length (FL in figure below) and ...
- 2,862
7
votes
Accepted
Difference between Ground Sampling Distance and pixel size in RapidEye
Ground sampling distance is the distance between each measurement at nadir.
Pixel size refers to what is delivered when data is purchased.
Some (commercial) data providers use a smaller pixel size ...
- 6,486
7
votes
How to calculate pixels per meter ratio, according to Google or Bing map zoom level?
I have written this on Android and it works. Google map tiles are 256 device independent pixels. So this first line calculates a tile size in device dependent pixels. The second calculates the number ...
- 171
7
votes
Accepted
How to interpret cell size ArcGIS?
Since the data that you have in WGS 84, this means that the cell size is in degree unit. In order to get the cell size in meter, you need to change the projection of your raster from WGS84 to meter ...
- 40.5k
7
votes
DSM resolution reduction in QGIS
there are a lot of ways of achieving this in QGIS as you surmise. One is to use the raster calculator and adjust the rows and columns to suite your new desired resolution (do this via Raster->...
- 33.7k
6
votes
High resolution screen on ArcMap?
There is now a solution to using ArcMap with high dpi screens at least on Windows 10. Install the Windows 10 Creators Update then change the settings on the ArcMap executable as shown below.
- 121
6
votes
Accepted
How to calculate final image size from wms?
EPSG:4326 does not convert nicely into meters, but you can calculate the lengths of latitude and longitude degrees for example with
http://www.csgnetwork.com/degreelenllavcalc.html
At 54°N the length ...
- 63.2k
6
votes
DSM resolution reduction in QGIS
In addition to GRASS r.resamp.interp tool suggested by @MappaGnosis, there is also SAGA Multilevel B-spline interpolation (from raster) tool in QGIS 2.18.14 . It is located under Processing Toolbox | ...
- 30.5k
6
votes
Accepted
Changing DEM resolution when creating a slope raster?
Before creating your slope layer (Slope tool is the right choice) you can use the Resample tool to change the cellsize of your input raster, without changing the rasters extent.
It is however ...
- 975
6
votes
Accepted
Hillshade not displaying correctly in ArcGIS Pro?
You are probably generating your hillshade from a surface model that is referencing a geographic coordinate reference system like WGS84. Re-project your data into a Cartesian coordinate reference ...
- 9,414
6
votes
Specifying target resolution when resampling with rasterio
You just need to figure out the scale factor from your chosen and current pixel size, e.g. I want to resample this 10m resolution "input.tif" to 12.5m:
import rasterio
from rasterio.enums ...
- 64.9k
5
votes
Accepted
What is the difference between DEM data sources?
With regards to your question of the difference betwen SRTM and EU-DEM the ESA quotes:
The EU-DEM is a hybrid product based on SRTM and ASTER GDEM data fused by a weighted averaging approach and ...
- 2,628
5
votes
Accepted
How to change spatial resolution using gdalwarp?
You don't say what your coordinate system is, but if it's in meters, your -tr arguments should be -tr 0.1 0.1. -tr sets the resolution (m), not the image size (cols/rows.)
Just guessing but GDAL is ...
- 3,101
5
votes
Is LANDSAT 8 Resolution too low for coastline difference measurement?
30m - 45m is a lot of change in a coastline over one year and only very dynamic areas see that kind of change rate. As such, you are correct in your assessment of the impact of imagery resolution on ...
- 6,486
5
votes
Sentinel-1A and Lansat-8 Resolution difference
This is a bit of an apples and oranges comparison. The Sentinel-1A sensor is an active radar system carrying a C-band synthetic aperture radar array. Whereas, Landsat 8 is a passive spectral system ...
- 31.4k
5
votes
Stack rasters with different origin, dimensions and resolution in R
For unifying dimensions and resolutions of rasters, resample() function from Raster package works well for me:
library(raster)
r1 <- raster("Animal.tif")
r2 <- raster("LandTrans.tif")
r3 <- ...
- 6,835
5
votes
Accepted
What does 4.5 mm resolution mean?
PROJCS details the coordinate system, the first line is:
PROJCS["WGS 84 / UTM zone 32N",
and then it says:
UNIT["metre",1,
which means that these numbers:
Origin = (357377.652999999991152,...
- 62.6k
5
votes
Basemaps provided by Esri
I complement the anwer with this aclaration:
Esri satellite base mapa (Imagery) will render the same information (tiles, resolution...) in any user interface used, could be a desktop software or a ...
- 51
5
votes
Changing resolution of rasterbrick using R
The function you are looking for is rather resample, res is rather used to set a resolution: if used to change an existing one, outputs an empty raster ; in the following example, a dummy raster is ...
- 3,454
5
votes
Changing 10m to 20 m Resolution in QGIS
There are at least 3 ways to change the resolution of a raster image with QGIS.
Use Layer-Export-Save as.. and give the resolution
Use Raster projections-Warp from the processing toolbox with an ...
- 63.2k
4
votes
QGIS on UHD screen
I've tried all of the scaling remedies I could find and so far, QGIS is not workable on an UHD Windows 10.
For other applications with similar issues, the "manifest" hack has worked pretty well.
...
- 41
4
votes
QGIS on UHD screen
Go to Settings >>> Options >> General Menu > Icon Size
Check this below:
http://docs.qgis.org/2.2/en/docs/user_manual/introduction/qgis_configuration.html
- 41
4
votes
High resolution screen on ArcMap?
Per ESRI Troubleshooting page this has been reported as an issue and still in effect as of November. It appears contacting ESRI support is your best bet.
Donald, this issue appears to be most likely ...
- 3,686
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