Questions tagged [image]

A representation or description of a scene, typically produced by an optical or electronic device, such as a camera or a scanning radiometer.

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Convert land-based camera image pixel x,y to ground lat/long or x,y,z

I have a number of cameras at various known locations (x,y,z) and directions that are above ground about 20 feet pointed at different ground locations about 100 feet away from each camera, and whose ...
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Canvas element with 'width: 0' in OpenLayers 6 instance on Vue.js

I am using Vue components to generate multiple instances of OpenLayers in the same parent component. Ultimately I am attempting to export an image of each instance of OpenLayers using the html-to-...
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Displaying images as part of multiattribute labels using QGIS

I would like to display images referenced in an attribute column as part of a multiattribute label, so that I can eventually print them with the map. I do not want to display geotagged images, since ...
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Export: Error: Internal error. from Google Earth Engine

I'm attempting to export an image by a time block for a particular census KML using the method below. Earth Engine is kicking back "internal error". As the error is not very helpful, I am having a ...
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5 votes
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540 views

Could not allocate required memory for image

I'm trying to export a 24k image (export set to 1650DPI) using the "export as image" function but I keep getting the "Could not allocate required memory for image" warning. I don't understand why ...
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5 votes
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Processing drone Images of body of water?

I took some pictures of a body of a body of water using a multi-spectral sensor attached to drone. When trying to process the image using Pix4D, more than 50% of pictures were unable to calibrated. ...
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Viewing images with relative path through Attributes Form in QGIS

I work with Sw maps (field data collector) that generates shapefiles in which a field links to images through relative path. Originally I had non problem using Evis plugin, now discontinued. Now I ...
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3 votes
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Saving osgeo.gdal.Dataset as GeoTIFF or JPEG with world files using GDAL from Python?

I am trying to take a plain JPEG with no spatial references, apply ground control points (GCPs) to it, and output a georeferenced GeoTIFF or JPEG with world files. I found some code that seemed like ...
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Reducing image collection separately for each image to make series?

I know how to reduce a collection to one image, or an image to a value in Google Earth Engine. But I can not find an easy way to reduce each image in a collection to a statistics and get a list of ...
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3 votes
0 answers
133 views

Image & limit user access by poly

Wondering how do I clip images to polygon outlines in a web map application based on OpenLayers or Leaflet? How can I limit web map users to see (visualize; qualitative) or query (quantitative) within ...
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3 votes
0 answers
811 views

Multiple image in OpenLayers

I'm trying to add multiple images to OpenLayers. I have the following (some code is excluded): var images = [image1,image2,image3] // these are url images on my server var image = new OpenLayers....
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How to read pixel values from an image server layer with ArcObjects?

I'm having a problem with reading pixel values from the image server layer. The image server layer class implements IRasterLayer, so when I tried to read pixel values using IRaster2 obtained through ...
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2 votes
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97 views

How are map tiles created?

I have recently been diving into the world of maps and I got interested to know how map services work, like Google, Mapbox, Leaflet, Open Street Maps and many others. I was confused about the ...
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2 votes
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29 views

ArcGIS Online Popups - Display Imagery date & time properties?

I am displaying linked images from traffic cameras in my AGO popups. The images get updated regularly. If I download an image and look at its file info it has associated date and time properties. Is ...
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250 views

How can I extract the Dnbr value in Google Earth Engine?

I'm trying to export the Dnbr value of each pixel, but i don't know how to do. This is my code: //SENTINEL2 var poligono = ee.FeatureCollection('users/florianaspatola/grassano'); print(poligono) //...
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2 votes
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168 views

Wrong values after resizing (resampling) rasters using cv2.resize (Python)

I have two images (aerial photographs): ImageA is 4740x4240 and cell size is 0.1 m ImageB is 1849x1653 and cell size is 0.25 m. I want ImageB with the same size than ImageA. I used the following ...
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2 votes
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Mask out areas inside a feature collection on Google Earth Engine

I am quite new to javascript and I am trying to apply a mask on an image to exclude areas inside a feature collection, I have seen that for the case of image collections the "mask" and "mask.not" ...
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QGIS automated export to image of multiple layersets

I have one project that contains layers in QGIS. Every layer is a quarterly update of my fairway showing the fairwayprofile and aids-to-navigation of the whole of my administration area. My current ...
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2 votes
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114 views

Charting Normalized Difference of Image Collection?

I would like to get the normalized difference of each image within an image collection (In this case Sentinel-2) for a specific polygon/geometry and then chart the values calculated for each image. ...
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468 views

Georeferencing multiple images as GeoTIFF (same size and extents) in QGIS

I have 50 images and I want to georeference them all on to the exactly same place. They have all the exactly same size and extends. I've begun to load the same georeferencing points for every single ...
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2 votes
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526 views

Select border region from segmented image

I have several thousand aerial photographs which have been scanned in and orthorectified, but the image borders and fiducial markers remain on the image. I am looking to identify these parts of the ...
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  • 307
2 votes
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59 views

Locating and copying millions of images in QGIS?

I have image data collected across the US and Canada from 2016 and 2017. I need to find all images that are within 5 meters of each other in order to compare changes in landscape over the year. Eg, ...
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264 views

Combine raster (monocromatic and RGB image)

I have to make an image starting from a cadastal map (monocromatical image) and an orthophoto (RGB image). Both are in tif format. The images are perfectly coincident, resampled to have the same pixel ...
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2 votes
0 answers
173 views

Adding non georeferenced image as BaseLayer

I am trying to add non georeferenced image as a Base layer in OpenLayers3 (v.3.8.2). On top of that there is WMS, called from GeoServer, as Overlay. I successfully loaded both layers, but they are not ...
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2 votes
0 answers
14k views

Zero-size array to reduction operation maximum which has no identity

Below is my identify background code, which identifies a background from an image and removes it.; Previously it's was working fine but after I chunked my images and try to find out background I got ...
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2 votes
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442 views

4 Band JPEG2000 compression for RGBNIR

The South African National Mapping Agency acquires multispectral imagery (R,G,B and NIR)and currently compresses its aerial imagery with JPEG compression with a TIF wrapper. So we give out JPEG (Q3) ...
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2 votes
0 answers
256 views

Non-HTML circle text labels on Leaflet map

I need to save image of Leaflet map with polygon, multi-polygons, circles and text below every circle. I have geojson file with circle and polygon coordinates (lat and lng). I managed to get image of ...
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2 votes
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218 views

Landsat Data to Map Slums in India

I am working on a project to answer the following geographic question: How much have slum areas increased in Mumbai, India, since the 1970's (or earliest data). I have downloaded LandSat imagery and ...
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How to create model maker NDBI indice using Landsat 8?

I'm having trouble making the model for NDBI (custom made in ERDAS 9.2) using Landsat 8 image? As a result of running the model I'm getting a white image.
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514 views

How to batch classify a multi-temporal raster image stack?

I am using dense time stacks of remotely sensed imagery to analyse vegetation change in the Arctic from 1984-2010 for one scene. I will be needing to classify each image, likely using the Maximum ...
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2 votes
0 answers
146 views

Flood extent extraction from satellite images

How can I extract the floodwater from satellite images? Is the image classification method accurate for moderate-resolution satellite (Terra/Aqua MODIS)? Or are there more accurate methods?
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Processing MOD35 cloud mask image?

I have a question about processing MOD35 cloud mask image. I worked reprojection on MOD35 cloud mask image using MODIS Swath Tool. The processed results of MOD35 cloud mask are consist of 6 band ...
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2 votes
0 answers
2k views

Automated testing for GIS apps

There are several commercial and opensource tools for regression automation. While many of them could be employed to test GIS apps, they fall short, at times, dealing with the unique characteristics ...
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2 votes
1 answer
114 views

Unable to load raster image in QGIS 3.20 Print composer

I have loaded QGIS 3.20, and in print composer, I have tried to load a gif image I have used a lot in other versions, and it fails to load, just the red X through the box. I have checked 3.18 ...
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1 vote
1 answer
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Use ostu to count water, but export image is all black

When I run my code, it can be print image in map. But when I export to the Drive, it becomes all black image. Like this: There is my code, it will be a few long. Most part of them is OSTU code which ...
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1 vote
0 answers
62 views

Is the position coordinate of a pixel the center coordinate of that pixel?

Is the position coordinate of a pixel the center coordinate of that pixel? For example, in an image composed of 4 pixels as shown in the figure below, the coordinate values of 150 and 150 are put in ...
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  • 447
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139 views

Plotting images from Google Earth Engine?

I am trying to plot GEE images as standalone figures (e.g., JPEG or PNG) for publications, however, I have not been able to find a standard method for doing that. For example, I have a landcover image ...
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  • 103
1 vote
0 answers
27 views

QGIS Problem with displaying web-based images by Action attribute

I have the .csv file, which includes the direct URLs to the images in the columns. Unfortunately, I can't open them at some point. Following this video: https://www.youtube.com/watch?v=nKxbOOsWwvk&...
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38 views

Filter collection of images with selected geometry

I am developing an application to analyze the images of the districts of a region. I select the districts this way and it works fine (see image) var selectd = ui.Select ({ items: Object.keys (...
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1 vote
0 answers
51 views

Image Stacking showing is stacking all the bands in the whole image collection instead of images in the filtered image collection date

I have created my image collection of 36 images and I have mapped the NDVI function over it. I created a stacked image and assigned the kNDVI band to the image. However, it is showing 865 bands ...
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Get a thumbnail URL for an image in GEE

I am trying to return an URL of my image, but an error appears on the console tab: Line 100: Setting the CRS, geodesic, or evenOdd flag on a computed Geometry is not supported. Use Geometry....
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1 vote
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39 views

Map parts turn white when exporting image in QGIS

When I try and export an image or map now from Print Layout, instead of creating a clean image, random white blocks appear over the image, as seen in image attached. Any thoughts as to what is ...
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1 vote
0 answers
90 views

Split Raster into Tiles - Set Extent

I am using this questions solution to split a raster I have into 1500x1500 tiles. The code works. I have recently been trying to figure out how to set the starting and ending points of the raster ...
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1 vote
1 answer
311 views

Google Earth Engine-function (image) condition

Is there a way to set a condition inside function(image) in GEE? In my case, I am trying to return images with NDVI<0.2 only and use them in qualityMosaic function to generate a composite (with ...
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  • 11
1 vote
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296 views

Detect Object Using Deep Learning Tool Error

I am having a problem when using the Detect Object Using Deep Learning tool in ArcGIS Pro 2.8. Problem: When I add any model to the tool the following error appears always. I downloaded many models ...
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1 vote
0 answers
32 views

Masked result from image expression

I am writing a code to calculate the Land Surface Temperature (LST), and one of the variables needed for this are the atmospheric factors w1, w2, w3. First, I added them as a property to each image in ...
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1 vote
0 answers
108 views

Count the polygons of the raster given by the kmeans algorithm

I am struggling with a Python problem. My plan is to compute the clustering of the kmeans algorithm for an image and to create polygons from this classification. My goal is to get the total number of ...
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  • 11
1 vote
1 answer
221 views

Definitely delete more than 1000 images from an image collection in Google Earth Engine using the code editor!

I need to definitely delete more than 1000 images from an image collection in Google Earth Engine using the code editor. After some attempts I arrived to the following code: var deleteA = function(...
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1 vote
2 answers
1k views

Export multiple Images from collection to Google Drive not working with Google Earth Engine Python API 0.1.238

I am struggling with Google Earth Engine Python API version 0.1.238 to export images from the Landsat EVI collection (from 2002 to 2020, but i started with a small sample) to my Google Drive, which ...
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1 vote
0 answers
72 views

KNMI MSGCPP geoview to WGS84

I would like to transform KNMI MSGCPP geoview netCDF file to WGS84 netCDF file with gdal_translation and gdalwarp. I got error msg. I shared the geoview netCDF file (140 MB): https://z001.s3....
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