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Questions tagged [pixel]

In digital imaging, a pixel, or pel (picture element), is a single point in a raster image, or the smallest addressable screen element in a display device. In GIS applications, a pixel may also refer to an imagery layer or other raster data.

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Where does the snapshot command take its pixel samples from?

I'm using the snapshot command in QGIS with a horizontal extent from 0 units to 24 units to create an image with a horizontal resolution of 4 pixels. Are the output pixels located at 3,9,15,21 (...
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2k views

How can I create a circle feature that will have a constant radius in pixels even on zoom in and zoom out? [closed]

Creating SVG icons have also solve it with much greater flexibility: var svgXmlCircle = '<svg version="1.1" id="Layer_1" xmlns="http://www.w3.org/2000/svg" ' + 'xmlns:xlink="http://www.w3....
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1answer
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On a map of the globe that is 1920x1080px, how big would each pixel be?

I heard from one source 21km square, and from another 245km square...
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1answer
310 views

Get indices from pixels with a certain value in PyQGIS

I'm working in the Python-Console of QGIS and I have an object form the class QgsRasterLayer. I want to get the indices of those pixels that have certain pixel value (e.g. I need the indices of all ...
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0answers
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How to integrate set of neighboring pixels in raster dataset?

I generated peaks of tree crowns as an individual pixels from DSM dataset, but there are some trees that have more than 1 peaks. I would like to integrate them based on the threshold value, for ...
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3answers
448 views

Extracting pixels of raster1 that overlap with raster2 in ArcGIS for Desktop?

I have 2 partly overlapping raster datasets, would like to extract pixels of one dataset that overlap with another dataset. Is there a tool in ArcGIS for Desktop to do this?
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2answers
482 views

Is it Possible to Resize the Pixels

I classified this image in ArcGIS 10.3, but my Professor said the pixels are big and I should make it smaller. This is my problem: is there any tool that can use to make the picture grains finer. Or ...
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1answer
337 views

Longitude latitude for each pixel of Tiff Image [duplicate]

I have a project to do and at the moment i have 2 tif images and their geografic data(longitude latitude) of their upper left pixel.What i want to do is get the common geografic place of the 2 images.....
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1answer
795 views

Extract All Pixel Values for each band in a Multi Band Raster

I have a few multi band rasters I'm working with, and I need to perform statistical analysis (in another program) on the data. My mentor told me to determine the value for each pixel in each band, and ...
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2answers
428 views

Is there an analog of PhotoShop's “Magic Wand Tool” in ArcGIS Desktop?

I want to interactively select rasters pixels based on it's values and modify them. Here is example of what this "Magic Wand Tool" should do:
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1answer
275 views

Getting different pixel depths from output raster when done in ArcMap versus Arcpy?

When I use 'Plus' in Spatial Analyst to add together two 8-bit unsigned rasters (pixel values 0-100) the output raster is 8-bit unsigned (pixel values 0-200) but when I try and do the same thing ...
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0answers
522 views

Change pixel size of 30m for 23.5m in QGIS [duplicate]

I need to change pixel size in raster file file with Pixel Size = (28.086057277202915,-28.086057277202915) using Qgis for Pixel Size = (23.951601289061028,-23.952379920305706) what kind of function I ...
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1answer
2k views

How to extract all pixel values in a raster file [duplicate]

I have a image difference from ArcGIS, which i have performed a remap function on. The layer is a temporary layer and does not have an attribute table, i need all the pixel values to do a frequency ...
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1answer
345 views

Selecting all pixels from Pixel Inspector?

While using the Pixel Inspector, whenever I click "copy all values" it only copies values that you can see on the screen. Anyone know a solution? I need all the values to count the number of times 1, ...
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0answers
75 views

Choosing pixel size when projecting raster from geographic to projected coordinate system

I have a raster showing animal abundance (straight count) in all of Canada. The raster was created unprojected in GRS 80 with a pixel size of 0.0833 decimal degrees. I was ask to project this raster ...
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2answers
4k views

Difference between Ground Sampling Distance and pixel size in RapidEye

I am a bit confused about reading technical specifications on RapidEye satellites. I assumed that Ground sampling distance (GSD) and pixel size express the same meaning, while GSD is 6.5 m, and pixel ...
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1answer
122 views

Per Cell Calculation

I have a population density raster data, but I'm trying to calculate the density per pixel? how do i go about this? working with ArcGIS
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1answer
2k views

Cesium js, Draw line binding a label to a position

I would like to draw a line binding a entity to its label with an offset. CesiumJS allows to offset the label, however its not possible to draw a line (or polyline) from a position to an offset like ...
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2answers
2k views

How to count the number of pixels with a specific value of a .gif file in QGIS

So I have this .gif file that has values from 0-255 but not entirely grayscale. I tried the r.report and it does not work. I also tried the raster calculator like: "myraster@1"= 1 (because I want to ...
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0answers
69 views

Mosaic DEM has large pixel when displayed in ArcMap?

I created a mosaic dataset in ArcMap 10.2 from tiles of ASTER DEM's at 30m resolution. I am attaching the image of what my export looks like. You can see that there are extremely large, alternating ...
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3answers
871 views

Can single raster pixel hold more than one value?

Can a single pixel of a raster hold more than one value?
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1answer
24k views

Getting pixel value of GDAL raster under OGR point without NumPy?

I am working on a computational model of the abundance of wild pollinators across a landscape. The model itself is complete, and I am now struggling with a post-processing step. I have my GDAL ...