Questions tagged [resampling]

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

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763 views

Changing Raster Resolution to match other Raster in QGIS

I have a raster layer of 0.125 degree resolution and another raster layer of 0.0833 degree resolution. Both the raster layers are to be overlapped. So, I want to change the resolution of 0.0833 ...
3
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1answer
475 views

Creating RGB composite using GDAL: resampling?

I want to use gdal_merge.py for creating rgb composite from 3 bands with the same qualities (resolution, crs..), but here I found that gdal_merge.py is using nearest neighbor resampling method. Is ...
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23 views

Can't have cubic resampleing with base map in QGIS 2.18.3

I want to display a raster with cubic resampling with base map, but it seems impossible in QGIS for some reason. I first change (in the style tab of the raster) the resampling to cubic and I get the ...
4
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1answer
4k views

Resampling a raster from python without using gdalwarp

I'm trying to resample a GeoTIFF file to match another raster layer using python GDAL package. Most of the ways I found online is to use gdalwarp resample data from the command line. Is there a way to ...
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2answers
323 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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1answer
109 views

A method to match narrow bands from in-situ spectrometer with Landsat-8 central band

Is there a way to resample Landsat-8 bands to match different bands from a spectrophotometer. I'm doing atmospheric correction, comparing in-situ reflectance measurements performed using 10-nm wide ...
2
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1answer
1k views

How gdal_rasterize works - how it interpolates / resample values?

I have huge number of points saved as shapefile. I created an empty raster file with low spatial resolution. Next, I applied gdal_rasterize on mentioned .shp and used low resolution raster as ...
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1answer
120 views

Clipping multiple resampled rasters to same size using ArcGIS Desktop?

I have various rasters of environmental variables that were imported as GeoTiffs or NetCDFs. The rasters had varying cell size which I fixed by resampling them using the Snap Raster function in ...
3
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1answer
48 views

GeoServer v2.9.1 re-sampling errors with GetCoverage request

App I'm using Openlayers3 and GeoServer 2.9.1 to create an application allowing users to draw an aoi then download it as raw data subsets (geotiff) of a Canada wide data set (also geotiff). I'm using ...
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1answer
175 views

Suggestions for open source command line resample algorithm that ignores nodata?

I am trying to automate the downsampling of elevation (and other) data using open source software at command line in an automated workflow via use of windows batch files. Currently the workflow uses ...
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36 views

Resampling raster based on more than 16 nearest cells?

I have a habitat suitability map, with cells of 30x30, each with a score of relative suitability for fox. The problem is that, with 30x30 cells, the grain is too fine for getting a broad sense of what ...
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397 views

Convert raster LST 1 km to 250m (R resample)

I have two files, where the NDVI is at 250m and the LST is at 1k, I want to use resample of R to convert the LST to 250m. ndvi <- raster("MOD13Q1.A2014017.tif") lst <- raster("MOD11A2....
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1answer
208 views

Resampling Raster

So I was thinking about a method that would allow me to essentially get the same resolution as a 3 meter DEM but with the size of a 30 meter DEM. As most GIS people know, 3 meter DEMs tend to be ...
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0answers
107 views

How to change the default resampling method in ArcGIS 10.2.2 to Create Referenced Mosaic Dataset

When creating a reference mosaic dataset in ArcGIS 10.2.2., the default resampling is Nearest Neighbor but I'm using continuous data so I need to change the resampling method. When using the Create ...
4
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1answer
590 views

Rasters lose quality when Georeferencing using ArcGIS for Desktop?

I've started to have a problem when georeferencing some rasters in ArcGIS 10.2.2 where the image appears in much lower quality with false colors and higher contrast. The images appearing in ArcGIS do ...
4
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1answer
1k views

Resampling method used in QGIS Raster save as?

I have what seems like a simple question, but I haven't been able to find the answer in the QGIS documentation. I have a raster that is 250 m resolution, and I want to resample it to 1000 m ...
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1answer
479 views

Resample fine raster before extracting values to coarser grid?

I have a raster with resolution 0.05x0.05 deg. I want to extract the values of the raster to a point grid with resolution roughly 14 km (mean latitude is 47 deg), which I have averaged to 0.1575 deg. ...
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0answers
329 views

Cell size in Mosaic to New Raster versus Resample cell size

I have several TIF 2 meter LIDAR DEM files (100+) that I am merging into a single raster and then creating 4m, 6m, 10m, and 30m DEM raster variants. I would normally just use the Mosaic to New ...
4
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2answers
289 views

“Downsample” a dense grouping of points onto a sparse grid

I have a SpatialPointsDataFrame with thousands of datapoints in a relatively small geographic area. The points are grouped around regions of physical measurements and are hence irregularly spaced: ...
2
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2answers
174 views

QGIS clipper tool misaliagnment

I'm using QGIS 2.14 and GDAL 1.11.3 and I'm running into a weird error with the clipped outputs. I created a shapefile in QGIS and used it to clip my image. Here's a simplified version of the ...
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1answer
107 views

Is Output Cell Size Environment the same as Resample tool?

I have a raster catalog that contains hundreds of rasters (10 x 10). I need to perform Cell Statistics SUM on all the raster. End user able to specify under what cell size the want to perform the ...
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1answer
280 views

Resampling Landsat 8 band 8 to 30m resolution (to same res as other bands)

I'm running a script in Matlab where I need to compare different Landsat 8 bands. The matrices of each band must match up, but I'm using band 8 which is at double the resolution of the others, and ...
2
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1answer
85 views

Spatial resolution for Bioclim datasets

I am new in using Bioclim datasets. I want to model future spread of Prosopis juliflora using landsat 30m. I want to add other datasets like temperature, ppt, elevation, soil moisture, pH, etc. Any ...
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1answer
315 views

How I can resample raster data infrom 10 meters to 20 meters resolution in ArcMap?

I downloaded Sentinel 2A satellite images and some bands are in 10x10 resolution and some bands are in 20x20 meters resolution. I would like to convert bands with 10x10 spatial resolution to 20x20 ...
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1answer
481 views

ArcGIS Resample Tool Crashes with “Not implemented”

I'm trying to run the Resample GP tool with a mosaic dataset as an input. The mosaic dataset contains a raster for Peru, the Democratic Republic of Congo, and Indonesia. Each raster is in WGS84, which ...
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2answers
426 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 ...
4
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1answer
227 views

Why do “stripes” appear on raster?

I am reprojecting a SRTM 3 arc-second raster file from WGS84 geographic coordinate system, to projected coordinate system which is using Azimuthal Equidistant projection: gdalwarp -s_srs EPSG:4326 -...
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1answer
777 views

Resampling a raster file with GDAL C#

Is it possible to resample the raster by using GDAL C# binaries, in a way that every other cell in a row and column is removed? Basically a replication of this GDAL command: gdal_translate -outsize ...
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0answers
282 views

Resampling netcdf file?

What is the best way to change the cell size of a netcdf file, keeping it as netcdf? I have looked into ArcGIS and GDAL and have not found anything yet. I prefer to use python if a solution is ...
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0answers
152 views

Is it valid to resample a raster from 1m to 3 feet?

I know that in general it is not a good idea to up-sample. I am curious if it would still be be a "bad idea" with a minor change like this from 1m resolution to 3 feet? Going to 3 feet would not ...
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0answers
239 views

gdalwarp won't run with “cubic” resampling method [closed]

I am having an issue with running the gdalwarp command from command prompt. Basically I have a raster WGS84 file, which I would like to reproject to spatial reference which is using the Azimuthal ...
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0answers
282 views

Flipped (Y-axis) Raster from point cloud

I have been working on a project where I need to create rasters from irregularly spaced point clouds. I am resampling my point clouds to a regular 0.25 cm grid using a nearest neighbor method ...
2
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0answers
251 views

Possible to resample tifs in numpy array? [closed]

I need to resample a large number of tif files. Is it possible to put the list of rasters in a numpy array and resample the array? I'm thinking this would be faster than looping through the list, but ...
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0answers
411 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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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 ...
2
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0answers
757 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 ...
3
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2answers
704 views

Changing pixel size in 'asc' file using Qgis?

I have soil data and BioClim data from Australia soil data: rows 2200 columns 1400 pixel size 0.0025, -0.0025 255 BioClim data: rows 660 columsn 420 pixel size 0.00833333, -0.00833333 I am ...
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1answer
177 views

How does Resampling raster work at corner cells?

This may seem quite a simple question for which I couldn't find a satisfactory answer. I have been trying to understand how resampling of raster work with ArcGIS 10.3, in both cases of refining and ...
2
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1answer
154 views

Resampling gives higher MEAN when using zonal statistics

I am using ArcGIS 10.1 for Desktop. I have a value raster and a polygon feature in GCS coordinates. My raster resolution is 0.5 decimal degrees which is much larger than the size of my polygons. My ...
2
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2answers
1k views

Resample not changing the cell size

I am trying to use the Resample tool in Spatial Analyst to go from a 1kmx1km grid to a 500mx500m grid for increased resolution of my land use data. My cell size is 0.008, and I want a 0.004 cell size....
2
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1answer
79 views

Can I use areal mean pixel value in raster for input to Extract Values to Point tool

I have a dataset consisting of a point vector file (plant leaf area) overlaid and georeferenced to a raster file (soil moisture) that I want to use as inputs to the Extract Values To Point Tool in ...
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2answers
918 views

Resampling DEM using gdal in python?

Using gdal I want to resample (in this case, oversample) a DEM. The only thing that should change is the pixel spacing, so I want to interpolate in between the values that I currently have. For this I ...
1
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1answer
402 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 ...
2
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0answers
382 views

Why does gdalwarp's cubicspline method expand into nodata areas?

The image below shows part of a peninsula on the Australian island of Tasmania. The black pixels are 9" climate data with GDA94 (EPSG:4283) SRS, projected by QGIS on the fly to Australian Albers (EPSG:...
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1answer
313 views

How does majority algorithm works in ArcGIS

I'm trying to understand how does the majority resampling works in ArcGIS, they write that "The MAJORITY option, which performs a majority algorithm, determines the new value of the cell based on the ...
2
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1answer
509 views

What resampling method is used in gdal_merge?

I am using the gdal_merge python script to merge rasters that have slightly different, though similar, input resolutions. The documentation advertises that it can handle different resolutions, and in ...
1
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0answers
511 views

When subtracting two raster with different cell sizes using raster math, what value is used for smaller cells?

After reading the answer to a similar question (What will happen if we subtract two raster with different cell size using Raster Calculator?), I am still left with a question. When the raster with ...
3
votes
1answer
650 views

ArcGIS resampling rasters by maximum pixel value?

I need to resample a binary image of linear features like roads, rivers to a coarser resolution, conceptually combining multiple pixels into a single one. 1 indicates presence of the linear feature, ...
1
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1answer
280 views

Looping inside r.mapcalc in GRASS GIS

I have a Land Cover classification map that I created from 2m resolution multispectral imagery and I am trying to downsample the results to a 20m resolution class map. The climate in question is ...
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2answers
299 views

Re-sample raster to acre grid using ArcGIS Desktop or R? [closed]

I have a 1m classified landcover raster layer that consists of values 1-4 representing various land covers. I need to resample this layer to an acre grid. Each acre in the resultant grid should ...