21
votes
Image collection to Single Image in Google Earth Engine
// UPDATE: The easiest way is now toBands().
var merged = MOD1.toBands();
// For completeness, this is the iterate() way:
var mergeBands = function(image, previous) {
return ee.Image(previous)....
- 4,309
14
votes
Accepted
Is the reflectance required to get the NDVI, for Landsat 8 images?
NDVI is defined for any two bands with near-infrared and infrared data (it is an empirical remote sensing index). As such, you can calculate it straight from the DNs. This is mostly OK if you are only ...
- 1,304
13
votes
Accepted
Adding excel table to QGIS print composer?
Save your excel file as CSV file
go to Add Vector Layer in QGIS and navigate to your CSV file and
load it
In the print composer, go to Add attribute table, as you can see below:
Select the Source ...
- 40.2k
12
votes
Accepted
How to Combine Two Image Overlaying Into One Image in Google Earth Engine?
Never mind my impatience,
It was easy. I just convert them to image collection and then create mosaic of it!
var combined_img = ee.ImageCollection([img_1, img_2]).mosaic();
- 292
11
votes
Adding site photos to a print composer atlas in QGIS
It looks like so hard without any script. So I tried a solution like below.
Sample data:
margin and interval
Script:
Copy/paste the script to QGIS Python Editor. Set layout_name, layer_name, ...
- 74.6k
10
votes
Accepted
Is this satellite image of a blackout real?
NASA's "Black Marble" is not one satellite image, but a mosaic gathered over several weeks and heavily edited:
The data was acquired over nine days in April 2012 and thirteen days in October 2012. ...
- 8,546
9
votes
Accepted
Automatically export each item in a layer as an image
According to the ideas posted here I suggest you to follow these steps:
Create a non-geometry layer with the names of your categories. For example, a virtual layer with SELECT DISTINCT (...
- 3,075
8
votes
Accepted
Creating vector (with lines/polygons) from raster based on paper map in QGIS
Not automatization (strictly speaking), but one good helper tool would be Gimp Selection Feature plugin.
It enables us to access Fuzzy selection tool of Gimp 2.10, and returns a polygon layer taken ...
- 30.4k
8
votes
Accepted
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 ...
- 2,717
8
votes
View more than three pictures in the image viewer of QGIS
It appears you can do this by explicitly setting a width and a height for the image in the section Integrated Document Viewer (to the bottom-right of your last screenshot). Instead of the images ...
- 14.2k
7
votes
Accepted
Using Open Google Earth cache file in QGIS?
I don't believe qgis is able to process Google Earth cache file.
I advise you not to wast your time. Instead use SAS Planet alternative. It stores tiles locally as
file:///D:/Software/SAS.Planet/...
- 196
7
votes
Adding site photos to a print composer atlas in QGIS
I know you mentioned you do not code, but your task may be cumbersome in click and drag software, because you want paired images-filenames; your goal may be accomplished with very few (8 to be precise)...
- 3,444
7
votes
Overlaying image with polygon shapefile in QGIS
Create a new layer, draw a polygon covering your area
Difference geoprocessing tool, with your polygon as input, and the blocks as Overlay. Set a dark grey or black symbol
Now you have a polygon with ...
- 67k
6
votes
Accepted
Otsu thresholding and classic image processing algorithms on radiometrically calibrated Sentinel-1 SAR images
Otsu's method does not really care about actual values since it tries to minimize the total variance within classes while maximizing the distance between the classes. So, you could just run Otsu on ...
- 266
6
votes
Accepted
Multi Temporal Images
Your understanding is correct. Obviously, you aren't limited to just two points in time, but that is only a minor variation.
Multi temporal information is generally used for change detection, but it ...
- 6,486
6
votes
I cannot find full Sentinel-2 scenes
As far as I know, only tiled scenes are distributed since october on the ESA hub, so you will need to download all the tiles. Note that there are several alternative websites to download S2 data with ...
- 49.3k
6
votes
Accepted
I cannot find full Sentinel-2 scenes
I acknowledge in advance that the following links don't provide you with direct access to the full scenes, but I do think that they are useful resources for searching the Sentinel-2 archive. In ...
- 4,872
6
votes
Detect the coordinate reference system based on an image
What you want is the projection, not the coordinate reference system. You need to look at the lines of longitude and latitude and work out from their curvature what possible projections it might be.
...
- 61.5k
5
votes
Free radar (SAR) satellite data
Sentinel-1 data is published as Open Data, with attribution, see licence here. Registration required. An API is provided. See Scientific Data Hub for details.
Software is also provided to process ...
- 345
5
votes
ArcGIS 10.3: Insert rotated image without background
This is a known issue with ESRI.
Their Page suggests these following workarounds (quoted from ESRI):
Use one of the following two solutions to solve this issue.
It is highly recommended to ...
- 3,862
5
votes
Image disappeared after changing CRS in QGIS?
The image was projected to new CRS. Set the map to Zoom Full or select the layer and choose Zoom to layer to see the image.
- 2,873
5
votes
Accepted
How to drape image on surface using open source software?
You can use Qgis2threejs plugin in QGIS to view an image in 3D. It has great options and potential capabilities that you can see in the plugin's documentation. Then plugin can be downloaded from QGIS ...
- 40.2k
5
votes
Sentinal-2 Georeferenceing
That depends what processing level you are referring to. Most data is delivered as Level-1C. According to the Sentinel-2 documentation:
Level-1C product provides orthorectified Top-Of-Atmosphere (TOA)...
- 9,775
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,...
- 61.5k
5
votes
Accepted
Earth engine error: Error: Invalid argument: 'image' must be of type Image
You are trying to export an ImageCollection. The MODIS product you are using has daily images, thus there are 29 images in your collection. The export to Drive only allows images, not collections, ...
- 9,775
5
votes
Convert PNG image to Shapefile in QGIS
Assuming your image is black-and-white only, you georeference it and then use extraction - contour lines to extract all the black lines as a shapefile. Since you get rather pixelated polygons, you'll ...
- 15.5k
5
votes
Accepted
When adding properties to an image, no longer allowed to add to Map
Some functions in Google Earth Engine make the object 'loose' its type. If you have a look at setMulti documentation, it says that returns an Element not an Image. So you have to tell Earth Engine ...
- 9,880
5
votes
How to insert multiple images in the Atlas in QGIS?
Just use expression to link the attribute as a source for your image like you do in case CROSS SECTIONS attribute [% "Cross-Sect"%]
In your case use:
<img src=[% "PHOTOS"%] width="600" height="...
- 6,765
5
votes
Accepted
Compress Large size of satellite image by Open Source GIS software
When in doubt follow Paul Ramsey's GeoTiff compression for dummies strategy.
gdal_translate \
-co COMPRESS=JPEG \
-co PHOTOMETRIC=YCBCR \
-co TILED=YES \
5255C.tif 5255C_JPEG_YCBCR.tif
and ...
- 79.9k
5
votes
Accepted
Filter out duplicate Sentinel-2 Images form Earth Engine Image Collection by date
You can compare the ImageCollection with a List of Images and generate a specific property and filter.
var sentinel = ee.ImageCollection("COPERNICUS/S2")
.filter(ee.Filter.eq('MGRS_TILE', "36RYV")...
- 66
Only top scored, non community-wiki answers of a minimum length are eligible