Questions tagged [digital-image-processing]

The field of raster image processing

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19 views

Landsat 8 band combinations aren't appearing the way they should in ArcMap

I did all the right steps of combining 7 of Landsat 8 bands into one .tif in ArcMap but the combinations aren't just appearing the way they should, attached picture related.
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16 views

Layer Stacking Sentinel-2 image on Google Earth Engine

How can I stack sentinel 2 Image? My complete code is : var image = ee.ImageCollection('COPERNICUS/S2') .filterBounds(table) .filterDate('2019-06-01','2019-07-01') .median() var subset = image.clip(...
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9 views

Using IDL poly_2d.pro with known p,q matrices for larger image

I determine p and q 2x2 linear image transformation matrices (2D shift, 2D scale, rotate) needed in IDL poly_2d for the center part of an image (using SolarSoft auto_align_images.pro). I want to ...
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1answer
33 views

Mask area of GeoTIFFs surrounded by 0 Data

I've a larger amount of GeoTIFFs which basically look like: The area of interest is the rectangle in the middle. Black shows 0-Data. My goal is to fill the left and right sided areas (round) with 0-...
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17 views

Statistics from one image to another in Google Earth Engine

I now have two images of the same place, image1 stores image values and each pixel on image 2 stores time (jday).I want to count the sum of image values of image1 at the same time point on image2.For ...
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1answer
34 views

Combining single cloud-masked images using Google Earth Engine

I am trying to calculate the mean pixel values of three Sentinel-2 images, all of which I have cloud masked separately. They all have small areas of cloud but in different places. I assumed that when ...
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1answer
57 views

Problem Visualizing and Downloading LANDSAT 5 Images With Google Earth Engine

I am new to GEE. I'm working with Landsat images. First, visualizing them in the map, then downloading them and working with them afterwards in QGis 3.6 to obtain certain indexes (NDVI, NDWI, Wetness) ...
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27 views

Increasing Resolution of Image By Splitting Image Pixel into Smaller Pixels | Google Earth Engine?

I have two MODIS satellite images with same custom band, one of 1000m/px resolution and other of 250m/px. I want to compute their mean 'image' and display as map layer. My current way of achieving ...
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19 views

Pixel-based image classification (Orthoimage or Raw image?

I am studying image classification and wanted to produce some land cover maps. However, i can not seem to find resources that states whether you need to geometrically correct (orthorectification) your ...
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1answer
74 views

Orfeo toolbox batch processing

I want to process Sentinel 2A images using another tool that is not SNAP. The later is very slow and crashes each time. I was recommended the Orfeo toolbox. I installed it on QGIS. I have 58 S2A ...
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1answer
28 views

Band Compositing

This is probably a trivial question, but is it possible to create band composites using bands of different resolutions (10m, and 20m)? I tried that and exported the resulting rasters to JPEG and it ...
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1answer
67 views

Image (band) interpolation

I have a set of sentinel 2A images. I eliminated those that contained too many clouds, and then I created a cloud mask using cloud probabilities and Otsu thresholding method to eliminate cloudy pixels ...
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28 views

Rasterio doesn't display the differnet bands of image

I have one raster which has three different bands. The two first bands look like this (in qgis): and the third band looks like this ( missing values in some places: The three bands sit on top of ...
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1answer
35 views

Processing and classifying satellite images using Python [closed]

I wish to process and classify Sentinel2-L2A images using solely Python (Google Colab). Is it possible to do such a thing, and if so, what libraries should I use?
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12 views

No data values collars error - delete values from image

I have a satellite image that has collars outside of the image. When I set no data value as 0 and set this colors as no display it also removes the pixels from the image with 0 - RGB. The image is ...
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1answer
161 views

“Spatial join” between raster and shapefille- give raster the shapefile values with python

I have raster which has NDVI values .In addition, I have shapefile(geopandas) on top of this raster but it doesn't fully covers the raster (illustration): the shapefile has column which contain data ...
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31 views

Making GEE code for Pansharpening Sentinel-2

The following link contain information about Pansharpening Sentinel-2 https://leclab.wixsite.com/spatial/post/pansharpening-sentinel-2-imagery-in-google-earth-engine The code in picture form and long ....
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45 views

Display raster with earthpy shows one color raster without values

I'm new to Earthpy, I am trying to display raster and on top of it I want to display polygon. The problem is that when I display the image it looks like blue rectangle and doesn't have different ...
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2answers
32 views

Transforming featureCollection back to an actual image

I am about to finish my calculations made on the feature that I have extracted from NDVI images. Each image was originally transformed into a list (by the scale of 10) and extracted to a CSV file. One ...
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1answer
60 views

Using the pixel quality layers of the Landsat SR products to create cloud and water masks in R

I tried to use the RStoolbox package function classifyQA to generate information on quality of the layers of interest, namely - cloud, cloud shadows, and water. I am unable to understand how to mask ...
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126 views

Cloud Masking of Sentinel-2-L2A images

I am trying to follow this Tutorial but in a different country. I am currently having a problem with cloud masks. I tried to visualize the different cloud masks of different patches at different dates....
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40 views

Is atmospheric correction necessary in image classification?

I am classifying Landsat TM and Landsat ETM (level 1) scenes for my study area as part of my research(LU/LC). The scenes are in a single tile and span 5 different timelines. I came across various ...
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13 views

Orientation in 3D coordinate space of a pixel in georeferenced video imagery

I am trying to find (a) method(s) to extract the position in 3D coordinate space of a bounding box (detected object in 2D video imagery) having knowledge the below: I have multiple images with ...
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2answers
142 views

“Copy” Image coordinates to another image that is nd.array

I have image with three bands. I have script predicts the first band pixels values by using the two other bands and in the end generates an image.The generated image is at the beginning pandas table, ...
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1answer
118 views

Calculate new band for satellite image after predict values with RF

I have satellite image which contains 3 different bands. I'm using Python (jupyter notebook) in order to calculate new band by applying random forest regression. My problem is that after I have ...
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2answers
363 views

Create pandas DataFrame from raster image - one row per pixel with bands as columns

I have a raster image with 3 bands. I would like to convert this image to a csv file where each row will be one pixel and each column will be one band, so that I can easily see the three values each ...
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34 views

Patch-based image classification!

To my knowledge, when building a CNN model for LULC classification of sat images using the pixel-based approach we consider each pixel as a training example and the number of input neurons equals the ...
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1answer
38 views

Re-Projection of a .sid image file

Does anyone know if I can use ArcMap or ArcCatalog to change the projection of a .sid img without changing it to a .tiff? I have tried the project raster tool but it changes it to a .tiff which will ...
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40 views

How do I extract data about the curve of a coast line from a satellite image using Google Earth Image?

I'm trying to use GEE to analyse the shape and curvature of ocean coast lines from satellite images. What I've been doing so far is: isolating an image from GEE, saving it as a png or jpg, and ...
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1answer
61 views

Landsat-8 level 2 DN to reflectance

I have downloaded a series of Landsat-8 level 2 images. My main purpose is to obtain reflectance out of them; however, the scale of the different bands does not look like reflectance (e.g. Blue Band ...
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27 views

How to remove the black edges around Landsat 8 images in Erdas Imagine

I am new to Erdas Imagine and would like to know what is the right workflow for removing the Black "null" Edges around Landsat-8 Images. When importing the scenes to .ecw, the color and contrast ...
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1answer
15 views

Differences between imported Landsat-8 images in Erdas Imagine

What is the difference between the images created after importing with USGS Landsat 8 dialog, in particular, the suffixes _msi and _msitir? I understand that they stand for multispectral image and ...
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26 views

Landsat-8 Image Enhancement for Mosaic in Erdas Imagine

My AOI lies inside a mosaic of 6 Landsat-8 squares and all the scenes have less than 10% cloud coverage. The rows of images of each of the 3 paths were taken only seconds apart. When importing the ...
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1answer
181 views

Making seamless and consistent quality of Landsat image after cloud masking and mosaicking/ median composite in Google Earth Engine

I am trying to remove cloud and composite all Landsat 5 TOA images available in a given year and region into a composite of final image. However, I noted that the quality of final composite image is ...
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41 views

What are the appropriate input/output ranges for WorldView 2 in GRASS i.atcorr module?

Can anyone speak to the appropriate range/datatype of WorldView2 rasters when using the i.atcorr module in GRASS GIS? I.atcorr requires the input raster be in at-sensor-radiance first, which I have ...
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27 views

Create new color-balanced raster from neighboring rasters

I have some true color 4 band (RGB+alpha) orthoimagery that I collected using VTOL fixed wing drones. Some of the images are darker than others due to the time of day, solar vignetting, and cloud ...
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1answer
29 views

What is the Sentinel-2 level-1B to level-1C interpolation method?

The Sentinel-2 level-1C raster data in cartographic geometry is resampled from level-1B data in sensor geometry, using B-spline interpolation. Which order of B-spline interpolation is used? ESA ...
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48 views

Bit Plane Slicing

Until now, I used Matlab (Octave actually) to perform a bit plane slicing using the function bitget. I am only intersted on having the most significant bits of an 8-bits grayscale image, i.e. the 7th ...
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44 views

Best way to correct UAS imagery sun glint over a water surface

I have a challenge of where there is a sun glint which includes both specular and non-specular brightening of a water surface on Unmanned Aerial Vehicle (UAS) imagery. Please see the raw image below ...
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1answer
60 views

How to chessboard segment landsat pixel edges in python?

Does anyone know how to do a chessboard segmentation (in the same way that ecognition does) that will select all the edges of a Landsat pixel in python/a Jupyter notebook? Given that I can use the ...
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1answer
53 views

Conversion of array to tif_Expected array of dim 2

I'm trying to perform a simple operation on an image, which is applying a median filter to it (for now). I'm trying to do it with QGIS and the console Python. My code is : import numpy as np from ...
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1answer
188 views

Atmospheric correction for planet images using ArcGIS Desktop

I am very much new to the field of image processing. I have several images from planetscope. 20190722_155754_1049_3B_AnalyticMS is one of them. I don't know how to process these images in ArcGIS ...
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1answer
228 views

Automated image enhancement in Python

I'm using Landsat 8 imagery in Python and want to make true color images that would look good in a publication. I have many images, so ideally this would be an automated process where each image comes ...
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1answer
36 views

How to manipulate the lake water in the UAV image to make it better using QGIS?

I am having a georeferenced UAV image over the lake. The image is a mosaic of several tiles. While doing processings by the experts the lake region ia not perfectly processed and left with voids and ...
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2answers
212 views

Digitalizing PNG image in QGIS 3.8

following the question: Getting polygons from PNG images for the QGIS Shapefiles I attended to digitalize the following PNG image in QGIS 3.8 following this instruction: https://www.qgistutorials....
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185 views

How to perform thinning/skeletonization morphology operation on GEE?

In google earth engine (GEE) they provide a morphological operator for erode and dilate as follows (Ref: here) image // Perform erosion .focal_min({kernel: kernel, iterations: 2}) // ...
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26 views

Information about NADADEM files .inc and .inc0 files

By NASADEM, it is available to download DEM data for worldwide, they sort theirs data into subdirectories hgt_merge, hgt_srtmOnly, inc, inc0 etc. I am interested in the directory inc and inc0, they ...
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1answer
88 views

Orfeo Toolbox maps Pleiades wrong

I have a problem with Orfeo Toolbox (OTB) function OrthoRectification. I have a Pleiades product which is an extract (not a whole scene) of a small area in the western hemisphere south of the equator ...
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1answer
87 views

Preparing two images with different dimensions to use in Agisoft PhotoScan

I have two aerial photos that are flowed over the national forest. The photos were scanned by a contractor and they came in various dimensions for each photos. The one I have had smaller dimension ...
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1answer
55 views

Unable to activate analytic asset in satellite Imagery

I was trying to import the map of Melbourne. I was able to fetch the details from API coordinates but when i am trying to check the analytic asset status, it is returning inactive. # extract image ...

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