Questions tagged [raster]
Raster is a data format consisting of regular grids of values, usually stored in an image-like format.
8,470
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Using x,y coordinates and a value gathered in an Excel file, set these values in a raster with Python and GDAL
I have an Excel file with X, Y coordinates and one Altitud value for each coordinate. I have already gather these values in Python dict (see image)
Also, I have a raster NetCDF file, which i have ...
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16 views
Distance to forest edge in R
I have a raster layer consisting 41 forest polygons and would like to calculate the distance of forest pixels to the edge within each forest polygon. I tried the code below
but the result looks like ...
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14 views
Why is the preview in SCP working, but the actual classification not?
I am using the Semi-automatic Classification Plugin (SCP) to classify Sentinel and Landsat satellite imagery. I have training ROIs saved in a file (.scp) and (re)calculated their spectral signatures. ...
2
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1answer
23 views
Differencing two rasters with very different resolutions (QGIS 3.20.3)
I am having a problem with analysing two rasters with 2 significantly different resolutions.
Background on the two rasters:
DEM is the ALOS_30m DEM which is in the WGS_84 format. Merged together ...
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22 views
EucDistance fails on last iteration of loop using ArcPy with ArcGIS Pro
I am building a tool for ArcGIS Pro 2.8.0 with Python using the template that ESRI provides. The first part of the tool defined in the execute function takes a point feature and loops through a search ...
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20 views
GeoServer Image Mosaic time dimension is disabled
I am trying to create NDVI map for 100 tiles. For each tile I have more than 10 TIFF files belonging to different dates. To do that, It appears that the Image Mosaic module can be useful with the time ...
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1answer
33 views
How to align rasters with small gap and overlap perfectly for merging
I have two raster files A and B, raster A lies completely in the extent of raster B. These rasters I want to merge into one while taking the exact values of raster A in the overlapping areas.
To ...
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27 views
Calculating overlapping areas using QGIS
I am new to QGIS.
I have a grid layer as layer one.
Polygon’s layer with many polygons as layer two.
I need to calculate the ratio of an overlapping area in one square of the grid where two polygons ...
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1answer
15 views
Georeferencing a raster image in a Mosaic Dataset greyed out in ArcGIS Pro
I have a Worldview 2 product from Digital Globe. To add it to ArcGIS I am first creating a Mosaic Dataset and selecting the Worldview 2 product definition and setting the coordinate system to be the ...
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2answers
48 views
Error when clipping raster by mask layer (polygon) in QGIS
I'm using QGIS 3.14.16-Pi and I'm trying to clip a raster layer by a multipolygon layer representing a network of protected areas.
My raster has 4 categories of values: -3, -1, 0 and 2.
I've tried ...
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33 views
ArcGIS Pro raster layer showing up in wrong place
I am very new to GIS and have only just started learning ArcGIS Pro. I have some satellite images that I have processed using a program called ACOLITE which outputs a NetCDF file.
I am trying to use ...
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26 views
NetCDF with negative dimensions
I am trying to read a NetCDF file with rasterio (Python), however, the resulting affine is showing negative numbers.
The .nc4 file comes from NOAA. How can I correct these negative dimensions?
nc_fo = ...
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2answers
63 views
How to manually adjust QGIS raster histogram X-values?
Background:
At 3.20.2 I am unable to manually adjust the raster histogram minimum and maximum X-values, as shown in the screen shot below.
There are fill-in boxes (within the red graphic box) which ...
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2answers
61 views
Split a huge .jp2 file into GeoTIFF tiles using R
I have the 2018 orthophoto of Luxembourg (RGB IR, entire country, 25 GB) and it is way too large to work with. Furthermore, it is in .jp2 format.
I want to translate it into smaller GeoTIFF tiles, ...
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27 views
Fast retreival of single-point bicubic interpolation from a raster? [closed]
I have a raster data set with a grid size of 100m. I want to get information from it for a single point within the grid, using bicubic interpolation to use a bit more of the information from the data ...
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30 views
How can I merge the bands for each ID to create two multi-band TIFFs in R?
I have 16 separate raster files, named by ID and band, for 8 bands and 2 IDs. How can I merge the bands for each ID to create two multi-band TIFFs?
Here are my data:
dput(rastlist)
c("...
3
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1answer
36 views
Generating paths from proximity map in QGIS
I'm trying to generate paths from proximity map in QGIS, is there a way to convert the light areas into vector lines?
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0answers
33 views
Wrong cell values after merging rasters in QGIS
I have two raster files A and B which overlap in certain areas. These rasters should be merged into one while taking the exact values of raster A in the overlapping areas.
For this purpose, I intended ...
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0answers
39 views
How to overlay shoreline shapefile into GeoTIFF file
I have a shoreline shapefile of five great lakes and a georeferenced lakeshore TIFF photo of lake Ontario. I want to overlay the shoreline shapefile into tiff photo as a new raster layer. Specifically,...
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1answer
33 views
Rasterio fails to create new tiff file inside for loop
I'm trying to save rasters with rasterio inside for loop.
For reason that I don't understand, the for loop works only in the first loop (being able to save the tiff image) but then when comes to the ...
0
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1answer
27 views
How to interpret Terrain Ruggedness Index according to Wilson et al. (2007)?
Is there a categorical scale used to interpret values from the Terrain Ruggedness Index as calculated by Wilson et al. (2007), which is used in the raster library in R?
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15 views
Overlapping two maps and extracting the mean value from overlapped range in R
I want to overlap a species distribution range on the world map which has values, and extract the mean value within the species range.
I have 1500+ species distribution range in a gdb file so I try ...
2
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1answer
53 views
Merge two overlapping rasters and only take values from one raster in the overlapping areas in QGIS
I have two raster files A and B which overlap in certain areas. These rasters should be merged to one while taking the exact values of raster A, and hence overriding/replacing the values from raster B ...
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15 views
Recreating QGIS "save Raster as Rendered Image" in python using GDAL [closed]
I have a set of GeoTIFF that will be inputted in a machine learning model. The problem is that GeoTIFF file is not considered as an image file for some reason and the model only takes in image files.
...
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2answers
25 views
Setting 0 pixel value to novalue using GDAL in Pythin API
I have a raster data and i want to set the 0 value pixels to NoData using GDAL in python API.
I know that you can do this by inputting this code in the command prompt.
gdal_translate -of GTiff -...
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0answers
26 views
Convert Raster coordinates from WGS to UTM and then translate it to XYZ [closed]
I need to extract the raster map as an XYZ file and in UTM format so I followed the following steps but it turned into all Z values are zero instead of their actual values, here are the steps:
From ...
3
votes
1answer
39 views
How to snap a vector layer to a raster layer in QGIS?
I am working with both vector and raster data. I have several vector layers with land use data, e.g. including urban, (types of) forest and agriculture. I am also using Sentinel-2 raster data. My goal ...
3
votes
1answer
35 views
Using buffers in Point Sampling Tool
I have 50m (shape file) buffers around (shape file) data points. I have another layer with the raster of the vegetation (indicated by different colours) in that land. I can easily extract the raster ...
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0answers
36 views
Calculate surface area on raster using Python
I have raster files (GeoTIFFs) and would like to calculate the surface area. I envision having a way to extract the coordinates at each corner of the pixels, then have the height values for each pixel ...
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0answers
15 views
Getting raster legend to change to match raster in map when dynamic range setting is turned on using ArcGIS Pro
When I bring a raster into ArcGIS Pro, I usually turn DRA on so the raster visualization changes depending on my map extent, but the legend never changes in the contents pane, or in the actual legend.
...
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29 views
Finding the minimum value cells orthogonally to a polyline
I have a raster (rast) and polyline (poly) as shown below with the corresponding data. For all the cells that line passes through, I want to find the minimum value among the cells that are located on ...
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1answer
27 views
Making raster layer with shortest distance of each cell to roads using QGIS
I have a road shp (or raster) layer, and I'd like to make a new raster layer of each cell is filled with the distance to the nearest road.
Is it possible to compute the layer using QGIS with some ...
1
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1answer
44 views
Clipping raster and shapefile and generate attribute table
I have a shapefile folder of property map and raster file of elevation. I want to clip those and generate attribute table.
I import both shapefile and raster file, then I click 'Full extent' and ...
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2answers
23 views
Read multiple layers raster from ncdf file using terra package
I want to read a specific layer from a multilayer raster (format ncdf) using terra package. I want to extract each layer by polygon using terra package (it is a very fast way to extract values). I ...
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13 views
Format rasterio Raster To Use In Further Operations
I am using this solution (with a couple of tweaks) to split my raster into tiles to further run operations on each tile. I am trying to figure out how to not have to write each split as a separate ...
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0answers
21 views
SAGA Ordered Weighted Averaging tool in QGIS Errors
I'm attempting to use the SAGA Ordered Weighted Averaging tool in QGIS (3.16) and am running into a few errors. Every time I've run the tool I've used the same number of inputs as weights in the table,...
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20 views
Rounding a raster to the hundredths place in ArcGIS Pro
I'm trying to round a raster with only positive values to the hundredths place in ArcGIS Pro. I found two formulas here on the Stack that would successfully round some of the values and others they ...
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1answer
28 views
Error in calculation of raster mean
I have a list of files corresponding to MODIS Aerosol Optical Depth (AOD). A part of list I would like to provide as sample is as follows
The sample list of files is:
MOD04_L2.A2020153.0445.061....
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1answer
16 views
Fix extent of R rasters (grid_density output) to match
I have two rasters that are the result of the grid_density() function from the liDR package. With those rasters I want to compare point distribution of subsets of a LAS file.
My problem is, that I get ...
4
votes
1answer
30 views
Modify raster pixels based on another raster layer
I have two raster layers. One layer contains the data of the first day a pixel experiences degrees Celsius above a certain threshold. The other layer contains hotspots in Iceland. These hotspots ...
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0answers
35 views
Visualising ground radar in QGIS using rendering
I have GPRI intensity ground based radar data as data validation for my SAR analysis.
As this does not appear to be a multi-band image, how do I render this on QGIS so I can see my targets?
I have ...
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0answers
35 views
Iteration through all features without performance issues when clipping raster
I wrote a little script but every time I run it I hit a wall with performance. So in order to iterate through each feature for gdal:cliprasterbymasklayer I wrote:
from qgis.core import *
import qgis....
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0answers
38 views
Clipping extent using QGIS is not matching shape only small sections
I am new here, and I am working with QGIS 3.16.9.
I have a shapefile and a raster. I am trying to clip the raster by mask layer, but it only cuts some pixels, not the whole shape.
And if I clip the ...
0
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1answer
28 views
Making classified grid from tab using MapInfo
I have a Tab file in MapInfo and values are text (Server Name). I want to create a classified grid. The file has more than 1 million points.
Lat---Long----ServerID
Anyone has created a classified grid ...
2
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1answer
56 views
Random sample of points surrounded by similar pixels in Google Earth Engine
I have a single-band raster (US landcover) where each pixel is assigned to one of a few classes. I want to get a random sample of points (lat-long) throughout an area such that each of those points is ...
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0answers
15 views
Projecting multidimensional raster creates single raster layer, not multidimensional output
I have a multidimensional raster layer in WGS 84 which I created with no issues from a NetCDF file in ArcGIS pro (https://pro.arcgis.com/en/pro-app/latest/tool-reference/multidimension/make-...
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0answers
11 views
How to detect if a binary raster bitmask and a polygon intersect using GDAL?
I am wondering how to efficiently solve the following problem. Given 1 bit georeferenced raster data that represents a bitmask, and a polygon - detect whether the area defined by the polygon covers ...
0
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1answer
30 views
Compare the overlap of two raster datasets, by corresponding year, output CSV of results
I have two datasets that I want to compare against each other within a defined shapefile boundary, within a defined yearly range EG (2000-2020)
a) A burned area raster for each year in the range.
b) A ...
0
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1answer
21 views
R - Write a raster object with the pixels transparency attribute
In R, I have a raster object for which I would like to set a certain level of transparency. When I visualize it, everything is fine
library(raster)
test <- raster(x = matrix(1:16, 4))
plot(test,
...
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0answers
18 views
Polygonizing raster files using QGIS gives different area polygons between GDAL 3.3 & GDAL 3.0
I used QGIS with GDAL 3.3 to polygonize a raster file. Added a field using the "field calculator" to calculate the area of individual polygons. Finally, to calculate the sum of the total ...
