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Questions tagged [resampling]

To alter the frequency of sampled data points in continuous data.

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21 views

How to downsample raster image for nightlights data in Python?

I'm working with the nightlights data - 30 arc second grids, spanning -180 to 180 degrees longitude and -65 to 75 degrees latitude. I want to downsample it to 5 arc-min resolution. Now my question is ...
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27 views

Error 000445 in iterate Resample for rasters in Arcpy

I'm trying to resample rasters using a foor loop. Something is going wrong but i don't know what... This is my code: import arcpy, os, math from arcpy import env from os.path import split, join from ...
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1answer
83 views

Cell size issue with Landsat data

I have calculated a temperature map from Landsat Image. This map is correct but I the cells can be seen obviously. I have changed the cell size from 30m to match my other products which are 1m. I used ...
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1answer
35 views

Resample raster to a higher resolution with ArcPy

I am looking for a way to upsample a raster to a higher resolution without interpolating in ArcGIS and arcpy (because I have geoprocessing script which treats a lot of rasters). For example if I ...
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1answer
86 views

EarthEngine: average/reduce a raster at resolution of coarser raster?

I want to average a 30m raster at the resolution of a 1000m one. Specifically, I want to computer, for each Daymet raster cell, the percentage of cultivated land from the 30m CDL. How can I do that ...
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37 views

Resampling raster with rectangular pixels

I have a raster file of deforestation but the pixeles are not square. When I project the raster the information of it says that the pixel size is 0.000275322,-0.000271395. I would like to resample the ...
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27 views

resampling/resamplinh from MODIS to Landsat ; Google Earth Engine

Link to GEE I am resampling MODIS to Landsat Data, and my Goal is to get a Landsat like projected Image, but with fuzzy Borders of former MODIS pixels. What I do not want: I tried my Luck with a ...
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28 views

Summarise rasters then project, or project then summarise?

I'm working on an analysis that involves summarising a stack of unprojected (WGS84) global 30" climate rasters (various expressions of temperature and precipitation), and generating final output in an ...
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11 views

Resampling categorical habitat variables to larger size in ArcGIS

I want to resample by land use variables (wetlands, waterbodies, roads, tilled areas, beach habitat) to 200m cell size from 15m cell size. However when I resample, the cells are not consistent across ...
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2answers
137 views

Resampling raster with categorical data in R?

I have a covertype raster layer which is categorical data (1,2,3...19), and I want to change its resolution, coordination system, column numbers and row numbers to fit with other raster layers. But ...
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43 views

Why gdal create does not give the proper projection?

Here is my code. I want to resample the raster. But it doesn't set the projection, although I write it. May be there is a simplier way to perform the resampling by pixel size? Is it incorrect to set ...
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59 views

[Resolved) Resampling ALOS images with Python

I'm trying to resample an ALOS image of 12.5 m resolution to 1 m resolution with cubic interpolation using GDAL warp. Here is the current code used in pyzo import os from os import path import ...
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1answer
52 views

Resampling two raster files

I have two rasters, one for road network and another one for the DEM of the country. I have to overlay the road network raster on top of DEM raster so as to get the elevation of roads. But my rasters ...
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52 views

Handling of NA (pixels without values) in raster::resample in R?

How does raster::resample handle NA values with the method ngb (or mean but I am most interested in ngb)? I had thought that NA values were ignored within a larger resolution cell-grid and the values ...
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0answers
16 views

Resampling of Landsat 2 data

I am using data for Landsat 2, Landsat 5, Landsat 7 and Landsat 8 for same region for change detection analysis. As Landsat 2 has spatial resolution of 60 meter while all the other data are in 30 ...
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1answer
88 views

Resampling 0.7 m LiDAR (in raster already) to 10 m DEM in R?

How do I resample the 0.7 m LiDAR to 10 m DEM in R? What are the basic rules for checking the consistency?
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197 views

Changing the spatial resolution - stacked raster in R

Want to change higher spatial resolution UAV dataset stacked in R. Used raster package to stack the individual band. Want to change the spatial resolution to 1 m. stacked_UAV <- stack(stack_list)...
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47 views

matching up cells in 2 raster layers

I've been trying to get 2 raster layers to match up, so the cells are in the same locations for both layers (they have the same resolution already). But I can't seem to figure it out, already tried ...
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1answer
20 views

Resampling raster to even coordinates (no decimals) using ArcGIS Desktop? [duplicate]

I am resampling a raster from one CRS to another, and from 0.5 m resolution to 10 m. But I want the new cells to have even coordinate extents, instead the old coordinate decimals remain. How do I fix ...
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1answer
52 views

set raster resampling window in ArcGIS

I would like to resample a number of rasters with a small cell size (i.e., 30 m) to a larger cell size (i.e., 100 m) using either ArcMap or ArcGIS Pro. My new, larger cells will each cover 3.33x3.33 ...
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1answer
159 views

How to resample QgsRasterLayer in QGIS 3?

I am generating png images of concentration maps, resulting from air quality modelling. Resulting files are croped and coverted to tiff files and than loaded into QGIS in Python: rlayer = ...
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1answer
55 views

Resampling multiple coarser raster images based on another finer resolution raster using R?

I have 2 raster images of different spatial resolution and projection. I want to resample multiple coarser images (0.25 degrees) to finer resolution(4 km) based on one finer resolution image which ...
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1answer
134 views

SRTM/DEM 1m resolution (batymetri) to point [closed]

I have bathymetry data (1 huge data) = SRTM/DEM/FGDBRaster (0,9818m resolution pixel, floating, 32 bit, 45 GB size) and an alternative data (split into small pieces data) = same data but with 1m ...
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220 views

Using max as resampling method with gdal_translate?

My Issue According to the docs it appears that gdalwarp has many more resampling methods than gdal_translate. Can anybody explain why the resampling methods can't be used with both functions? ...
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221 views

Correct resampling method to simulate lower resolution satellite data?

I would like to simulate lower resolution satellite imagery from continuous higher resolution imagery. For example I want to use Landsat derived leaf area index data with a resolution of 30 m and ...
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1answer
66 views

How does bilinear resampling work when converting a 10 meter raster to 30 meter?

There is a 10 meter resolution land cover raster. An analyst wishes to resample 10 meter raster to 30 meter raster. The analyst selects the Bilinear Resampling technique in the Resample tool of the ...
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72 views

How can I stop single pixel nodata values propagating through a tile pyramid when using gdal2tiles?

I am using gdal2tiles_parallel.py to generate a tile pyramid from a single geotiff with nodata value set. I have noticed that if I have a small hole in the original geotiff (say single pixel), then I ...
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1answer
26 views

Mapnik upsampled raster isn't smooth

I'm using Mapnik to show a map with hillshading. It works well when displaying it up to my tiff's native resolution and a little bit above, for instance at zoom 13 (dataset is SRTM30): But then if I ...
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2answers
169 views

How does oversampling work in WMTS layers?

(This question arises as a sub-topic of the answer provided here.) In the symbology options for a raster layer in QGIS, there is a setting called "Oversampling" (see image below). How does this ...
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1answer
253 views

Understanding raster symbology settings

I am trying to understand how to use the symbology options for raster layers in QGIS, particularly the Resampling options, but the official documentation only mentions the setting very briefly and ...
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1answer
27 views

modal resampling in GDAL: what happens when two classes are equally represented

gdal_translate has a parameter to resample the values based on the most frequent class in the output pixel (-r mode). However, this most frequent class does not necessary exist (when two or more of ...
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48 views

Aligning multiple images with different spatial resolutions

I am using 2 different satellite images that have different spatial resolutions. One of them has 1 degree and other has 0.25 degree resolution. I want to subtract one image from another. So I should ...
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164 views

How to compare 2 NDVI images using python?

I want to compare NDVI of 2 images(TIF) of the same area of interest using python. My end result is to get the region on the image where NDVI is decreased(to depict crop damage). Problem: Images have ...
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1answer
203 views

What is the default method in raster package R resample?

What is the default method in the resample command from the raster package in R? I see that you can chose some methods like bilinear or nearest neighbor, but what is the default? This is important ...
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176 views

Can't resample two images with different coordinates and extents

I am very new to image analysis and GIS. I tried to resample a tiff file based on a reference raster, the following is the code and objects I have: Green_stage_1: class : RasterLayer band ...
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45 views

Does raster snapping involve a transformation?

Arc Desktop 10.5.1 Background I am converting an Arc Grid raster to a tif using the Raster To Other Format (multiple) tool. In the tool's Environments... settings, I am snapping the output tif to ...
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155 views

R GIS - Error when converting SpatialPointsDataFrame to raster : 'data' must be of vector type, was 'NULL'

I would like to convert a SpatialPointsDataFrame into a fine raster (5m resolution), using R GIS. My SpatialPointsDataFrame is made of 593 points, equally distributed along a 8km-grid. Their ...
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1answer
374 views

KeyError running python script that aligns the grid cells of two rasters and does resampling if needed

I am currently working on a model that calculates the water balance of a basin "the VIC model". First we need to align (coregister) all of our input raster data sets to the grid template at the ...
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2answers
495 views

Resampling raster based on mask raster?

I want to resample rasters of e.g. 2 m resolution to the same raster cell size and projection of an existing raster (25 m). However I cannot really find answers how to do it properly. I managed to ...
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1answer
169 views

Resampling Modis and Sentinel 2 rasters

I am resampling Modis and Sentinel 2 rasters in QGIS. I am working with surface reflectance values and I am having trouble obtaining the results that I am looking for. I have isolated my rasters down ...
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1answer
3k views

Up-sampling (increasing resolution) raster image using GDAL?

I have a single-band geo-referenced raster image (a DEM) and my goal is to increase the number of pixels in each dimension (x and y) by 3. So given an initial resolution of 1200 * 1200 pixels, I want ...
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1answer
754 views

Pros and Cons of using Bilinear Interpolation and Cubic Convolution when dealing with DEMs? [duplicate]

I am currently processing a handful of DEMs (derived from LiDAR data). I have a conceptual question, when choosing a Resampling Technique what are the pros and cons of using Bilinear Interpolation and ...
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1answer
97 views

error: wrong resolution for raster calculator, how to work with this?

I have two raster files (lets call them raster A and B) and I would like to multiply them with the raster calculator. I keep getting an error message when working with the raster calculator. I thought ...
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1answer
745 views

Reproject masked array with rasterio

Is there a way to preserve the mask of a numpy array when reprojecting it with rasterio? See the reproducible example with real data below: import os import tempfile import rasterio from rasterio....
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96 views

ArcPy raster output spills over environment extent by one row and one column

I'm resampling a raster, and I would like it to line up and match the dimensions of another template raster. For whatever reason, the output of the Resample_management function has an added row and ...
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0answers
242 views

Downscaling 1km data to 250m with points

I am doing some species distribution modeling with MODIS 250m data, and would like to downscale 30 arc-second (1km) bioclim data to 250m so that I can use them in my models. My idea is this: Rather ...
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1answer
31 views

How can I resample statistics from one set of districts to another?

I have statistical data for a certain region based on a subdivision of that region into districts (e.g. number of schools per district). Now I want to resample that data to a different subdivision of ...
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0answers
117 views

Eliminating large plateaus in coarse resolution DEMs?

I have a 15-meter, integer DEM I converted into a float raster. However, the original DEM contains large lowland areas that are nearly completely flat. Due to the original resolution and integer ...
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1answer
252 views

Reprojecting a raster

I am trying to reproject a raster and change its resolution with the function projectRaster() in R. I looked up at the R documentation website (https://www.rdocumentation.org/packages/raster/...
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1answer
46 views

Raster sampling using ArcGIS Desktop?

Is there an ArcGIS function to sample x% where x lies between 0 and 100, of a raster? I do not want point sampling and ArcGIS functions seem to focus on point sampling. For ArcGIS, I use version 10....