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32 votes

Scale 16 bit to 8 bit within range using GDAL

If you don' want the values above 255 to be cut, you need to scale them down. For that purpose gdal_translate provides the option -scale: From the Manual: -scale [src_min src_max [dst_min dst_max]]...
pLumo's user avatar
  • 6,519
22 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, ...
Christiaan Adams's user avatar
14 votes
Accepted

completing satellite imagery tiles when data coverage is less than 100%

For images of the same location but different dates, I would rather talk about compositing than mosaicing (which combines images from different extents into a larger image). You will find a lot of ...
radouxju's user avatar
  • 49.8k
14 votes
Accepted

How to split multiband image into image tiles using Rasterio?

Below is a simple example (rasterio 1.0.0 or later, won't work in 0.3.6). There might be better/simpler ways (and there is an easier way if your raster is internally tiled and the tile block sizes ...
user2856's user avatar
  • 67.2k
12 votes
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Using rasterio to crop image using pixel coordinates instead of geographic coordinates

You can use a window -rasterio.windows.Window to read by pixel offsets. The georeferencing can be easily calculated from the window using the source dataset window_transform method. import random ...
user2856's user avatar
  • 67.2k
11 votes

Identifying image location?

IMAGE REVERSE SEARCH WITH GOOGLE IMAGES Doing a reverse search using images.google.com I found this link from wikimedia commons: https://commons.wikimedia.org/wiki/File:M%C3%...
DavidTaubmann's user avatar
11 votes
Accepted

Should I always choose Sentinel-2 atmospheric-corrected imagery?

Atmospheric correction is particularly usefull if you need consistency between dates and/or adjacent tiles. Some studies showed that the use of atmospherically corrected images improve the subsequent ...
radouxju's user avatar
  • 49.8k
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 ...
maycca's user avatar
  • 3,376
9 votes

Where can i download a good World image in GeoTIFF?

I was able to georeference an xglobe image using gdal_translate gdal_translate -a_srs WGS84 -a_ullr -180 +90 +180 -90 xglobe-2400.jpg xglobe-2400.tiff
Liam's user avatar
  • 191
9 votes
Accepted

How to visualize multiband imagery using rasterio?

The Rasterio Plotting documentation describes how to visualize multiband imagery. For example, using 4-band NAIP imagery: import rasterio from rasterio.plot import show src = rasterio.open("path/to/...
Aaron's user avatar
  • 51.7k
8 votes
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Is there an online catalog for declassified Soviet Union Spy Satellite images (Zenit-4, Resurs-F1, Okean)?

As others have shown interest for this question I'll answer it using the information I've been able to gather so far: There might be more than one archive or old Soviet Union imagery. As there were ...
Camilo Rada's user avatar
  • 1,219
8 votes
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Noisy lines in all scenes for Landsat 7?

You should read about the Landsat 7 ETM+ SLC-off data This refers to all Landsat 7 images collected after May 31, 2003, when the Scan Line Corrector (SLC) failed. These products have data gaps, but ...
Yogesh Chavan's user avatar
7 votes
Accepted

How to know which satellite took the image?

According to https://www.digitalglobe.com/sites/default/files/ISD_External.pdf you should have a field called satellite with a mnemonic like: “QB02”, “WV01”, “WV02”, “WV03”, “GE01”, “Aerial” Which ...
nmtoken's user avatar
  • 13.5k
6 votes
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Satellites to retrieve UV bands

The US Naval Research Laboratory has developed the "Special Sensor Ultraviolet Spectrographic Imager" (SSUSI). Versions of it have been aboard DMSP satellites since 2003, improving in accuracy. It ...
Mathnerd314's user avatar
6 votes
Accepted

Making Leaflet image overlay draggable?

A simple workaround is to bind the imageOverlay to a draggable Polygon (thanks to w8r for this idea, developer of Leaflet.Path.Drag) var poly1 = [ [40.71222, -74.22655], [40.77394, -74.22655]...
Hannes Bl's user avatar
  • 133
5 votes
Accepted

Filling in missing values in raster using R

I am the author of the R package gapfill, which is a flexible tool to predict missing values in spatio-temporal remote sensing data sets. https://CRAN.R-project.org/package=gapfill It could be helpful ...
Nairolf's user avatar
  • 211
5 votes

Flattening multi-band raster to single-band raster in ArcMap?

Suggestion from Stephen Lead is sufficient for grayscaled rasters but not for coloured rasters (e.g. DOF). If you want to preserve the colours (conversion is quite good) then use Copy Raster tool and ...
Damijan's user avatar
  • 51
5 votes

How to check accuracy of Roads

Rather relying on online service, you should download a high resolution imagery, geo-reference it accurately and then use as reference for quality assurance. See the resources for fundamentals of ...
Junaid Abdul Jabbar's user avatar
5 votes

What's this rooftop texture found in Google Maps imagery - is it an artifact?

It's visible in Streetview in 2011 and 2014. Looks like the roof is covered in Tyvek or some other waterproof construction barrier cloth.
Marc Pfister's user avatar
  • 4,097
5 votes

Is there an online catalog for declassified Soviet Union Spy Satellite images (Zenit-4, Resurs-F1, Okean)?

I'm afraid, but there is only little chance, that such images will be in wide access. Most part of such images is still on film source, not in digital. Maybe there are resources, forums, trackers etc.,...
Sergey N's user avatar
  • 309
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,...
Spacedman's user avatar
  • 65.1k
5 votes

Purchasing NDVI imagery for South Western England?

I don't think this is the answer you're looking for but with the specifications you describe, unless there is a subscription through which the farmers need to finance imagery purchase, it would ...
Gabriel's user avatar
  • 3,155
5 votes
Accepted

Adding Here WeGo Satellite imagery to QGIS?

I think there may be an issue with your app_code and app_id. I was able to add that service as an XYZ Tile in QGIS using my App_id/App_code, but not with yours. Is yours restricted to a domain? And: ...
Jay Cummins's user avatar
  • 14.7k
5 votes
Accepted

Writing into XMP and EXIF Metadata from attribute table values in PyQGIS

pyexiv2 Solution: Select layer and run the script. You have to change values to string for non-string fields using str() method. This solution is about layers which were created by ImportPhotos ...
Kadir Şahbaz's user avatar
5 votes

Should I always choose Sentinel-2 atmospheric-corrected imagery?

Yes, there definitely are situations when L1C is preferable! The problem with L2A imagery is that it attempts to fill-in cast-shadows, and doesn't do it very well when they are pronounced, causing ...
Namo's user avatar
  • 86
5 votes

Why the number of images are not same when using .size() command and by using 'Inspector' tool in GEE?

The number of images in the collection is the one reported by ee.ImageCollection.size() which in your case is 276. The number reported by the inspector tool includes only the images which footprint ...
Oliver Lopez's user avatar
  • 1,274
4 votes

Redefining nodata value into zero in QGIS

For QGIS 3.28 there is a "Fill NoData cells" tool under Raster tools
Rainfall.NZ's user avatar
4 votes

Free download NDVI images or raw satellite images for Sri Lanka?

For high spatial resolution, you can download Sentinel-2 data. It has worldwide cover every ten (very soon 5) days. You have 10 meter bands in Red and NIR, so you can compute ten meter NDVI (vs 30 m ...
radouxju's user avatar
  • 49.8k
4 votes
Accepted

Building georeferenced GeoTIFF from mbtiles automatically?

You should use something like: gdal_translate -of GTiff zoom13.mbtiles export.tiff The reason for the -of GTiff part is that the default output is TIFF, with external georeferencing, rather than ...
BradHards's user avatar
  • 12.9k
4 votes
Accepted

Information on WKT definition file

0.017453292519943295 is the conversion factor from radians to decimal degrees, exactly PI()/180. Geodetic functions usually expect angles in radians, but our surveying ancestors decided to use ...
AndreJ's user avatar
  • 76.7k

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