Questions tagged [digital-image-processing]

The field of raster image processing

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8 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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18 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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28 views

GEE code to pansharpen swir1 band of sentinel 2 image [closed]

Will some body please share GEE code to pansharpen swir1 band of sentinel 2 . Regards
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1answer
785 views

What causes this rainbow image artifact in Google Maps satellite imagery?

I discovered this "rainbow" over the Yellowstone River in Google Maps: View the site in Google Maps: https://goo.gl/maps/y6xETmY859M2 You can see a distinct red, yellow, and blue streak hovering ...
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1answer
103 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
45 views

Create pandas df from raster image- each pixel is a row

I have raster image with 3 bands. I would like to convert this image to csv file wso each row will be pixels and each column will be one band, so I can see easily the three values each pixel got. ...
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1answer
81 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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26 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
24 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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1answer
21 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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37 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
24 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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12 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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20 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
12 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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1answer
336 views

Preparing an integrated band depth image

How do I prepare an integrated band depth image? If I have to prepare an 1 micrometer integrated band depth image (sum of 0.79 and 1.3 band depth micrometer bands), do I just average all bands from ...
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171 views

Earth Engine: Function to generate daily image collection from 3 hourly

I am working with GLDAS-2.1 image collection. I would like to generate a daily image collection with max temperature, min temperature, mean temperature and sum temperature for each day from 3 hourly ...
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34 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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21 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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5answers
872 views

Extract DEM and DTM information from LIDAR image using E-Cognition

I´m trying to extract DEM and DTM from a LIDAR file. Currently, I rasterize the image but don´t know which algorithm I need to apply to obtain the DEM and DTM information in different models to be ...
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30 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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556 views

Writing code to add calculated image to display in Google Earth Engine?

I wrote a code for Land Surface Temperature (LST) from Landsat 8 images in google earth engine. I have successfully calculated the following steps, NDVI, fractional vegetation (fv), emissivity (EM), ...
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31 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
49 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
91 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
29 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
29 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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1answer
93 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
35 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
110 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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2answers
2k views

Image classification using google satellite images

Currently our expert user classifies locations by viewing the Google earth satellite image of a location. They consider circular areas of a 5km radius at a set zoom level. They evaluate the image for ...
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0answers
102 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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0answers
25 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
159 views

Reading large image using GDAL?

I want to read large image. The image size is 92117 x 30313 pixels. So far I know cv2.imread can not read large size. How can I read using GDAL API?
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1answer
71 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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69 views

How to export a rasterio window to an image without geo-reference information?

I would like to export a rasterio window to an image. import rasterio def export_window(w, path): number_of_bands, height, width = w.shape profile = { "driver": "JPEG", "...
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1answer
65 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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2answers
292 views

Feature normalization (scaling) for Hyperspectral images

I have been straggling with the concept of feature normalization for the hyperspectral images. Respect to my problem I have attached a picture of my problem which clearly stands the issue which I have....
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1answer
106 views

Cloud mask for worldview

I'm using worldview imagery downloaded from gbdx and I want to apply cloud mask for it. It's preferable to use ready-made layer or some python module/tool to create it. The demand for the method ...
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0answers
204 views

Histogram matching in Google Earth Engine?

Does anyone know if there is a more GEE-friendly way of achieving this? I'm experimenting with S1 SAR image histogram matching in GEE and was wondering if foremost the code can be improved. Read here ...
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0answers
29 views

Generate multiple polygons based on JPEG image?

I have a number of image files depicting polygons (the original shapefiles are lost). Is there a way to automatically create new polygons in GIS, based on the form of the shapes visible in the image? ...
2
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1answer
113 views

QGIS raster calculator ^2 operation gives negativs results

I want to compare 2 same tiles at different dates. I use the raster calculator like this : (IR_band_frb - IR_band-aug)^2 But I get this result : The data range goes from -6049 to 4486 ... Why I ...
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0answers
866 views

Decision tree classifying of satellite image in R?

I want to classify satellite image in R using RWeka classifier, J48. I have a CSV file with the classes required, and raster data loaded in R. I am able to make the tree, however, I am not able to use ...
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4answers
14k views

Splitting .tif image into several tiles? [closed]

I have an image of size 1GB (.tif), with the width and height 94000x71680. I would like to chunk this image into 20000X20000 tiles so that I can process them. How can I do this?
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2answers
121 views

Detecting 12bit images in 16bit

Setting For the purpose of a machine learning algorithm I'm tying to automatically scale images of arbitrary bitdepth to unit interval, i.e. I want to map pixels from [0,2x] to [0,1] simply by ...
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0answers
66 views

How to get pixel per meter in MATLAB

I have a vector shapefile which is in unit of 'Meter' presenting boundary of overall Germany. I am converting it into raster format based on each pixel representing 300 Meters respectively. After ...
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1answer
473 views

Calculating band depth image for M3 data

I am working with chandrayaan M3 hyper spectral data. I need to create a band depth image for identifying mineral abundances. How do i calculate the continuum reflectance value for producing a band ...
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0answers
27 views

QGIS raster files not aligned due to different extent

I have a DEM file of building heights calculated from DSM-DTM in QGIS. Based on this DEM file, I generated a mask that indicates the presence of buildings in matlab. However, when I load the building ...
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0answers
225 views

What does cumulative count cut actually do?

I have a grayscale satellite image (16-bit image) which is dull (low brightness). When I apply cumulative count cut from 2 to 98 percent (Properties -> Min-Max Setting -> Cumulative count cut), it ...
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2answers
121 views

Relative Radiometric Normalization of multisensor Landsat Level 2 images using R

For my time series analysis, i need to use images of the three Landsat sensors (TM, ETM+ and OLI). I chose the already atmospheric corrected surface reflectance/Level-2 products. Due to the ...

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