Questions tagged [raster]

Raster is a data format consisting of regular grids of values, usually stored in an image-like format.

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Click and drag georeferencing

I am looking for a way to take a group of layers in QGIS and be able to move/geolocate them. I need to offset hundreds of TIFF raster files that are currently in a QGIS group, and I don't have a ...
CaptainFishboy's user avatar
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1 answer
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Modify a subset of a raster based on a shapefile

I want to modify a subset of a raster based on the extent of a shapefile. The raster is of ground elevations and I need to modify an area that has been excavate into a big hole by subtracting 200 m. I ...
Em_kath_white's user avatar
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Vector grid to raster error

I try to raster grid layer using layer attribute and I get rasterization error. Initially I have a layer with a grid and a line layer with several lines. The line layer has an attribute ("az"...
redhat's user avatar
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What data does clustering use from multiple raster files? [closed]

I currently have a series of rasters of the same area across different times. The data is categorical: the product of a supervised classification used on LANDSAT data run on ERDAS Imagine. Each ...
Phil's user avatar
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3 votes
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"Could not load source layer for INPUT" error when reprojecting flt-file with PyQGIS

The data I have are ESRI Floating Point Data (so they are a raster type). The path I provided is a fake path, so that I don't show my real system paths. I know that my code works with vector data, as ...
i.i.k.'s user avatar
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Pred and zlevel arguments from deprecated gdalUtils R library mosaic_rasters function [closed]

I'm trying to run some older R code that relies on the now deprecated gdalUtils library. I'm trying to find a way to run the following function in an equivalent way using a library like raster or sf. ...
Samuel T's user avatar
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Low reflectance values

I use DJI P4 multispectral. Here is the command I gave in opendronemap software. –dem-resolution 1.5 --orthophoto-resolution 1.5 –orthophoto-png --dsm –radiometric-calibration camera –texturing-skip-...
SS101's user avatar
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3 votes
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How can I mask values for black outline around imagery using ArcGIS Pro?

I pulled some NAIP imagery off the web. There is a black outline that I am trying to get rid of around each image. I tried to change the symbology to not include the zero values for each band but it ...
ZephyrZ's user avatar
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QGIS DEM (Raster) merge: errors

I'm trying to merge 4 tiles (ASC) of a French 1m digital elevation model. Files are loaded in QGIS, they bear no errors, value range is coherent. Merging comes with errors and the result is a raster ...
Gilles's user avatar
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Resample Raster in PyQGIS with Median Approach

I have a raster file with a spatial resolution of 2m x 2m. I want to resample the raster from a 2m by 2m resolution to a 25m by 25m resolution in PyQGIS. My approach is using the Nearest Neightbour to ...
eagleadmiral's user avatar
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How to Build and Export a MSAVI raster file from Google Earth Engine [closed]

I am working on a species distribution model for a lizard species in the American Southwest, from northern Utah to middle of Mexico, middle California east to middle New Mexico. One of the variables I ...
CSG's user avatar
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ENVI 5.6.2 HSV problem

I've used ENVI a lot in the past, but am a bit rusty. I have never ran into this problem and can't find anything online about it. I'm trying to do HSV sharpening with 3 band multispectral data and a ...
R. Ian Cunningham's user avatar
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1 answer
30 views

How to add raster file name to the attribute table of a polygonised version of the raster file? [closed]

I have a polygonised output of a raster file but need to add the raster filename to the attribute table of the polygon (vector) file. I can do this manually using the command 'base_layer_name' but I ...
wj68's user avatar
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How to obtain superimposed colors from 3 raster RGB in QGIS

I have 3 separate raster layers with binary values (1/0). By assigning the 3 primary RGB colors to each of the layers, I would like to obtain a representation that expresses the overlap of the layers ...
Peter J.'s user avatar
-1 votes
1 answer
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ArcGIS error 000735 during Save As with raster dataset [closed]

How to solve this error? I can't rectify my georeferenced data because this format option is disabled so when I click save it gives me can't save raster dataset It just gives me this error due to ...
Wania Imran's user avatar
1 vote
3 answers
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R: Error Data is too long

I have a R Script, that is extracting some information from a dem Raster through a multiprocess step. At one Point the standart deviation of the raster is calculated: std_ras <- sd(ras_smooth[], na....
Pradakasten's user avatar
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gdal_fillnodata strange artifacts

I'm seeing an odd artifact when using gdal_fillnodata.py. I have a raster (purple is no data, white and black are two different numeric values). Using a mask exactly corresponding to the no data ...
Stev_k's user avatar
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Use exported WMS layer style (.qml or .sld) to style a vector layer in QGIS

I'm reaching out for assistance with a problem I've encountered while working with QGIS. My goal is to apply the styling defined in a WMS (Web Map Service) layer's exported style file (either .sld for ...
Mabignix's user avatar
1 vote
1 answer
38 views

Change select color in a raster in QGIS using Serval or Value tool

Is it possible to edit the table view of a raster that you see in the Value tool? Alternatively Using Serval, once we have a selection polygon can we choose a specific range of raster values within ...
GeorgeC's user avatar
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1 vote
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Create copies of rasters in R via GDAL

I am looking for an efficient way to create copies of rasters in R via GDAL. Since the advantages of such an approach might not be directly obvious, here is some more context. Via GDAL we can read ...
darius.goergen's user avatar
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How To Create An Occurence Frequency Raster From a Stack Of Images Using Python

I have a stack of single-band rasters calculated using the following band ratio on a stack of Sentinel 2 images. Thermal Anomaly Index (TAI) = (B12 - B11) / B8A This band ratio is helpful in ...
Ali Turab Hani's user avatar
1 vote
2 answers
56 views

How to reclassify building raster into 0 and 1

I'm new to GIS and QGIS and I'm trying to follow this youtube video: https://www.youtube.com/watch?v=fitQGrrthH0 In the very beginning, the video discusses input data; there is a raster containing ...
Will's user avatar
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-1 votes
1 answer
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How to calculate single standard deviation raster image from single raster image values ranging from 0 to 80 using QGIS [closed]

I have one raster image value ranging from 0 to 80. I need a standard deviation image of the same raster. I'm using QGIS.
N Satish's user avatar
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How to calculate the area of each grid cell of a raster in Python?

I have a square raster of size, let's say, 100x100 cells, with each cell being 200m X 200m. This raster is not in an equal-area projection, but is centered on the North Pole, meaning the actual area ...
Marcus K.'s user avatar
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Strange pixel column numbers in imported GeoTIFF file

I am loading a .d file (from SAR ceos file) with 11,000 pixels x 11,000 columns into QGIS 3.16.4. Perhaps this is a funny input format (not sure) but it appears that QGIS loads it well but reprojects ...
Marco's user avatar
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-1 votes
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Creating arbitrary raster tiles and coordinate system for paintings

Looking for the best way to take a complex painting say the sistine chapel ceiling a high resolution Create Tiles (raster) so folks can Zoom in Create Overlays and Call outs Create some vector ...
technosprout's user avatar
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1 answer
38 views

Some polygons are loading incorrectly as terra SpatVect but not SpatialPolygonsDataFrames

I am seeing an issue with some polygon features loading incorrectly as terra SpatVectors. I cannot replicate this issue yet, but here is an example polygon as an rds on Google Drive. If I load this ....
Scott Z's user avatar
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How to determine the resolution of a raster with 0.25 degrees in meters?

I have a raster of 0.25 degrees resolution. What's the right equation to determine how is the resolution in meters?
Omab's user avatar
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Convert each pixel of a raster layer to polygon Google Earth Engine

I am currently working on a raster of the United States that spans from the east coast to the west coast in Google Earth Engine. The raster was created using an image from the MODIS satellite at a ...
FlyingKangaroo123's user avatar
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terra::project seems to be changing the values of a raster

I am trying to calculate the proportion of a land use category in R just like it's explained here: Calculating continuous raster representing land cover proportion from categorical raster using QGIS? ...
c roc's user avatar
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0 answers
15 views

ArcGIS Pro reducing multiple rasters to minimum extent

I have multiple (approx 20) rasters. They all mostly overlap in extent with each other, but each raster has various pixels missing that others do not. Ultimately, I need all rasters to have the exact ...
Nick Beauregard's user avatar
1 vote
0 answers
41 views

ArcPy Check if layer is finished drawing

I have a script that creates a kind of time series by toggling on and off a bunch of raster layers in sequence. I have a counter that waits a certain amount of time before going to the next raster. ...
JUNGLE's user avatar
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Produce ISEA "Icosahedral Snyder Equal Area" GEOTIFF/raster with gdalwarp

Is an icosahedral projection impossible to produce with PROJ/GDAL ? Produce ISEA "Icosahedral Snyder Equal Area" GEOTIFF/raster with gdalwarp. I am trying to use gdal tools to convert Plate-...
Molly's user avatar
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1 answer
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Identify raster cell values with a polygon or a raster layer on top in ArcGIS Pro

I am using ArcGIS Pro. How do I identify values in raster cells while there is a polygon or another raster layer on top with the Explore-tool? I don't need to select any values, and I also don't need ...
Sn0W's user avatar
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1 answer
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Clipping sf vector by terra raster extent with R

I am trying to do something fairly simple: I want to clip a vector with point features down to only features that are contained within a raster extent. For raster I am using the package terra, for ...
Honeybear's user avatar
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3 votes
0 answers
49 views

How to close a GDAL PostGIS connection?

This issue has been bugging me for years, desperation got the better of me so now I'm here to seek the help of the public. I'm storing raster data in a PostGIS database, and I'm using GDAL from Python ...
Jeroen's user avatar
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0 answers
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How do I project a Landsat image correctly using Build Virtual Raster?

I am trying to make one complete image using B4 images from USGS and another using B3 images to then calculate NDVI. The issue I'm having is a single image not lining up in the same projection (see ...
Aimee Calkin's user avatar
0 votes
1 answer
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QGIS incorrectly says a raster's max value is 0

This raster, 25.5mb uncompressed, 4.4kb compressed as 7z, has a min & max value both of 0: However R says it has a max of 1: And if I remove all the 0 values, there are 25 remaining values: ...
dez93_2000's user avatar
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0 answers
36 views

Using 'rasterize' to create raster of overlapping polygons

I have found similar questions, but most use different packages. I have a shapefile with 20 multipolygons, with a few attributes. All I want is to create a raster whereby each raster cell's value is ...
Beardedant's user avatar
1 vote
0 answers
18 views

Extract Multi Values to Points for two time-enabled layers using ArcGIS Pro

I have a time-enabled point layer (5-minute resolution) and time-enabled raster layer (hourly resolution). I'm trying to create a new field in the point layer by extracting values, but it's doing so ...
RML's user avatar
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1 vote
1 answer
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QGIS: Need to create a feature for a vector layer with a list of all unique values derived from a raster layer's cells

I have a vector layer with inner boundaries delineating certain land-use types in each discrete area. I also have a raster layer that contains information related to the vegetation found in each ...
Linus's user avatar
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0 answers
28 views

Delimit an urban area on a surface with QGIS

I want to delimit an urban area using a raster analysis in QGIS. Is there a Plugin that performs this procedure?
Miguel Armas's user avatar
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0 answers
27 views

QGIS: Processing tools adding a false edge to vector layer with extreme values

I am working in QGIS 3.34.2 and several processing tools I've used so far have added a thin outline (1 cell wide?) to the edge of my area of interest (see output of aspect tool below). The vector ...
Linus's user avatar
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0 votes
1 answer
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lidR: Writing output from pixel_metrics() from "multiple-output-function" to separate raster files

First some background from the original question: I'm using the lidR package to make rasters of metrics calculated on point clouds. I have a custom function that calculates 9 metrics outputed as a ...
Martin Stjernman's user avatar
1 vote
2 answers
54 views

Raster layer transparency based on another raster layer values (QGIS)

I'm working in QGIS. I have two raster layers: an unique values raster, representing the number of wind turbines visible for each pixel (reds palette) a raster with values (0-20000) expressing the ...
Peter J.'s user avatar
1 vote
1 answer
33 views

Visualising PosgreSQL database raster table in ArcGIS Pro

I have created a PostGIS-enabled PostgreSQL database, with a raster table in the public schema. When I create a connection from ArcGIS Pro onto to that database, I can see the raster table but I can't ...
marcgm's user avatar
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Changing value of raster within set radius

I have a raster map of an aquifer. I want to alter it so that the water level changes around a point(an active pump). What i need is a way to select a radius on my raster and lower the Z value within ...
Algae's user avatar
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0 votes
2 answers
44 views

Enlarge numpy array to fill/pad bounds in rasterio whilst keeping existing data intact

I'm looking to do what this question and answer is doing using gdal_translate / gdal_warp, but in Rasterio. Does anyone know of a way? I can't find anything in the rasterio.warp.reproject module that ...
Stev_k's user avatar
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1 vote
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Calculate terrain attributes for a large, tiled DEM

Input: A large DEM as tiled GeoTIFFs (initially 1'665 tiles, each 500 by 500px, later possibly more). Goal: To calculate some terrain attributes such as the TPI, waterflows. Approach for smaller areas:...
Beni's user avatar
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0 answers
22 views

Rotate stars raster object around the centroid in st_geotransform

I'd like to use an affine transformation to translate and rotate a stars object around the centroid. As far as I understand, the general approach is to i) translate the object so that the centroid ...
Thomas Moore's user avatar

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