Questions tagged [resampling]

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

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3 views

Merge ImageCollections with different pixel size

I want to combine 2 different Image Collections (i.e. Landsat8 and Sentinel-2), and I want to combine them to a unique ImageCollection (and then run the function qualityMosaic()). However, they have ...
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29 views

Creating an in memory rasterio Dataset from numpy array

I am reading in a raster using rasterio, and then upsampling the raster as per the example in the documentation: def upsample_raster(raster): return raster.read( out_shape=(raster.height *...
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Understanding rules of changing pixel size? [on hold]

I have solar irradiance 270x270 m data. If I increase the pixel size to 100x100m or 30x30m is it valid in a scientific method? Is there any references that I can refer to in this regard?
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1answer
57 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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20 views

ALOS PALSAR resampling

I want to combine Landsat bands with the backscatter coefficients of ALOS PALSAR. I used the following code to resample and combine. However, the HH, HV bands in combine image showed with 'masked'. I ...
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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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30 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
38 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
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
97 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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1answer
405 views

Resampling 30 m NDVI to 5 m in ArcGIS [duplicate]

Is there any easy way to resample 30 meter NDVI from Landsat 8 images to 5 metres? I use raster to point and the interpolation of point to raster using Kriging method. I know that it may not be a ...
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Resizing image resolution in ArcGIS Desktop?

I have NDVI images (250 m) and Soil map (1000 m). How can I change the resolution from 1000 m to 250 m, so I can compare/work with them?
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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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30 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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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
176 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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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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67 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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69 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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17 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
89 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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238 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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48 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
72 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
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
57 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
192 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
403 views

Reducing number of points, keeping most recent data within given distance, using QGIS?

I have a HUGE dataset of points that were collected along a route. The data may change daily, and the most recent data is the most important. What I would like to do is take only 1 point from a given ...
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1answer
140 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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265 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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1answer
27 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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274 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
69 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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76 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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2answers
187 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
277 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
29 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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2answers
3k views

convert lat/lng to pixel and vice versa

This had been asked previously on Stack Overflow. I've tried different methods/formulas but results are not correct. 40.764296,-73.97302 should result into 930,3590 pixel on map image. I've Manhattan ...
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50 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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1answer
46 views

The resampled image has many NaN values and does not cover the complete area of the input raster [closed]

when I resample an image of 20m to 240m resolution, the resampled image does not cover the whole area of the input image and does the resampling for some pixels in which I get many NaN values. How can ...
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1answer
218 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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2answers
325 views

Use python to resample a raster 12 times in increments of 10

Objective: I want to take a sample landscape (with a resolution of 10,10) and resample it systematically in increments of 10 until a max of 130,130 (and eventually write each new rasters file path to ...
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207 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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2answers
540 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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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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1answer
100 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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3answers
6k views

What resampling technique should be used when projecting aerial photos?

I'm doing some time-intensive projecting of aerial photos, and I'm curious - what resampling technique is best to use on aerial photos? In ArcMap, my options are NEAREST, BILINEAR, CUBIC, and MAJORITY....
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0answers
164 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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0answers
761 views

Efficient way to resample, crop, and mask a raster image using R

Does anyone know an efficient way to resample an image? I am currently trying to crop a large image and clip two regions from a shapefile. From this clipped image, I would like to increase the pixel ...