Questions tagged [extract-by-mask]
Isolating particular cells to a new raster based on overlap with another raster or vector layer, or specified values/ranges.
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Masked array fill value getting changed
I am using the following code to mask the clouds from Landsat image using
QA band. I am facing the strange issue as you can see I have 2 print statements in my code which prints the fill_value of ...
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2answers
22 views
Mask raster function in R not working to extract values in one raster based on conditions in another
require: raster package
I am having trouble masking values of one raster using values in another. This is similar to this question:
https://stackoverflow.com/questions/51716315/how-to-subset-...
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0answers
17 views
Masking Landsat-8 and Modis (Aqua) with same shape file doesn't result in same shape
I was trying to mask Landsat-8 and Modis (Aqua image). FYI, I have converted the MODIS image to the same projection as Landsat and same resolution as 30m. Finally once i am done with masking using ...
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1answer
32 views
Is there an alternative function which does the same thing as clip raster by masked layer on QGIS?
I am having some technical problems with the clip raster by masked layer and I faintly remember using a different method a long time ago for a similar problem. Anybody familiar with another function?
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1answer
45 views
Mask with ring polygon in R?
I'm trying to mask a raster with a ring polygon using the function raster::mask, but only recognizes the outer edges of the polygon, can anyone help me with this?
I only need the pixels within the ...
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1answer
43 views
Count number of pixels from .msk in Python to derive study area size
Apologies I am totally new to GIS in Python.
I am trying to find out the total area of the Barents Sea mask the NSIDC use to calculate their products and therefore I need to know how many pixels the ...
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1answer
47 views
How to mask a raster layer to only include specific values in QGIS?
I'm attempting to reduce a raster layer, wherein each point represents night-time luminosity/intensity of city lights, to include only those pixels with values in the top 10% of values. Effectively, I'...
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1answer
39 views
Select area from raster layer as a new layer
In qgis 3.4.6, I tried to select an area from a raster map, to use the cropped area as a new layer or export the cropped area as a geotiff.
I'm trying to use "Raster/Extraction/Clip Raster by Extent",...
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131 views
QGIS 3.6--Error— Creation of data source failed: unable to open database file
I have been working on 3 predators' data layer files.
I created a vector point shapefile for each predator prior to do a heatmap (GeoTIFF file) for each data layer file.
In order to extract 50% of ...
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1answer
7 views
Additional mask files
I used the tool "Extract by Mask" to clip a raster. It resulted in 5 tif images: mask, maskc1, maskc2, maskc3, and maskc4. What are the maskc1-4 files? They're large and I'd like to delete them if ...
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1answer
124 views
Clip bathymetry raster file from vector mask layer its not working in QGIS 3.4.3
I'm trying to extract bathymetry of Mediterranean Sea raster GeoTIFF file (downloaded from https://www.bodc.ac.uk/data/hosted_data_systems/gebco_gridded_bathymetry_data/gebco_30_second_grid/) from ...
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1answer
49 views
Extract By Mask - Raster Horizontal Shift
Is there a way to snap a raster/DEM to a mosaic dataset?
I am using the Extract By Mask tool in ArcPro on a mosaic dataset. The output raster's cell values do not match the original mosaic dataset it ...
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1answer
136 views
Reprojection of satellite images mosaic to CRS with latitude and longitudes
I downloaded MODIS product MOD13A1 for India. Then mosaiced the granules in GeoTIFF format using rasterio Python library. I have the appropriate shapefile to mask the mosaiced raster.
After mosaicing ...
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2answers
338 views
Extract by Mask tool not clipping to mask extent?
I am using ArcMap 10.4.1.
I am using the Extract by Mask tool to clip a raster using a polygon shapefile. When the tool finishes running, the output raster does not fill the entire mask extent (see ...
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1answer
78 views
QGIS Mask - Error Code
I am trying to interpolate points and then clip the interpolation with a Raster> Extraction> Clipper. I receive an error code after trying to mask over the region I am interested in. Would you ...
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1answer
42 views
Does ArcGIS Desktop have similar tool to QGIS Clip raster by Mask layer which creates and outputs alpha band on request?
This QGIS tool creates an alpha band by clipping an image with a polygon.
https://docs.qgis.org/2.8/en/docs/user_manual/processing_algs/gdalogr/gdal_extraction/cliprasterbymasklayer.html
Is there an ...
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0answers
136 views
Clip raster by mask layer gdalwarp error in QGIS
I've been trying to find why my gdalwarp isn't allowing me to clip a raster to the shape of a shapefile.
GDAL command:
gdalwarp -ot Byte -of GTiff -cutline /Users/johnmorris/Desktop/Geodata/...
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1answer
635 views
Google Earth Engine, how to distinguish between rivers/streams and ponds/lakes in a water mask
I am trying to pull out every lake and pond in a region of SW Alaska. I have successfully identified all water features using the following code:
// study area
var rect = ee.Geometry.Rectangle([-168, ...
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1answer
141 views
Clipping raster with shapefile and exporting each raster subset using ArcPy?
I want to clip a raster image using a shapefile with differents polygons (each polygon have its "FID_malla" value [FID_malla is large data type]) and save the subset rasters individually with "...
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0answers
170 views
Exporting NetCDF layers as individual rasters? [closed]
I have a NetCDF (CRU diurnal temperature data) for each year and month from 1901 to the 2016.
I would like to export individual rasters for a selection of the year and month options.
I would like ...
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0answers
33 views
Extraction by mask using a polygon changes the cell counts on each category?
I am attempting to use Extraction by Mask on a raster set (land use) to gather the cell counts of each category. The data is from a county level and the polygon I am using is a specific city within ...
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0answers
66 views
Different outputs from Clip_management and ExtractByMask
I have a question about clipping a part from a raster according to the extent of a polygon.
Should Clip_management and ExtractByMask create the same results if I set the "NO_MAINTAIN_EXTENT" option ...
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1answer
107 views
Average of polygons within mask polygon
I have two shapefiles. One consists of squared grid cells and contains ... let's say precipitation data. The other one was downloaded from NaturalEarthData and contains country-internal administrative ...
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1answer
725 views
Error clipping raster files in QGIS?
I have a series of raster files I´d like to clip to the same extent. To do so I am using a shapefile as mask through the method (raster >extraction> clipper) but every time I do so I keep getting the ...
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1answer
66 views
How to clip specific cells from raster that aren't fully covered by mask?
I have two data layers of the same geographic area, one which has a much coarser resolution and the other that is a much finer resolution. As such, the first layer has some cells that do not overlay ...
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3answers
4k views
Iterate through features to use selection as input for ExtractByMask
I need to iterate through each of the features of a feature class successively to use each one as the mask to extract from a raster with the ExtractByMask tool. Basically I'm looking for the "Iterate ...
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3answers
742 views
Extract by mask
I have a netCDF file. After converting the file into a Raster layer, I extract it for my study area i.e Pakistan. After applying the extract by mask tool the extracted raster layer does not properly ...
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1answer
100 views
Extracting multiple shapefiles by mask
I have one shapefile which is divided into multiple villages (polygons). I can see the name of the villages from attribute table of the shapefile. For each village, I want to extract elevation from ...
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1answer
300 views
Cell size changing when cropping a raster
I am cropping a large raster with the extent of a smaller one.
The printout for large:
class : RasterLayer
dimensions : 6327, 12697, 80333919 (nrow, ncol, ncell)
resolution : 463.3127, 463....
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1answer
146 views
Extract By Mask gives different result (and WARNING 000622) in ArcPy than from tool dialog?
I'm using ArcMap 10.3.1
When I use the gp tool to extract by mask, I get the correct result with any area outside the mask set as NoData.
When I do the same thing in a script, I end up with cells ...
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1answer
45 views
Extract Specific Raster Cells From Gridded Shapefile
I have a raster image with a corresponding shapefile grid in which I am looking to extract an individual piece of that image using a single grid of the entire shapefile. The gridded shapefile is ...
2
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1answer
397 views
Need to Extract by Mask on Features in a Feature Class
I have a polygon feature class of a country that has water basin polygons as individual features. I am trying iterate each feature and Extract by Mask using a set of rasters - for instance on Basin_ID ...
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1answer
252 views
Export raster with one band only using gdalwarp in extracting raster using shapefile via python script? QGIS 2.18
This code of mine is written to extract raster using a particular shapefile in PyQGIS:
import subprocess, os, glob, gdal
result_path = "/data/brent/bukidnon_hansen_data/result_path//"
os.chdir("/data/...
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1answer
2k views
Extracting raster by mask outputs raster with extent beyond the mask layer's in QGIS
I'm trying to extract a section of a raster file that overlaps with a polygon shapefile in QGIS 2.18.3. When I run extract, I'm left with a large null value area as part of the extent of the output ...
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3answers
140 views
Error on Extract to Mask | ArcPy
I am attempting to run Extract by Mask through a loop using Search Cursor, where the Cursor is defined by the row "FID" in a table from a grid shapefile. The code is as follows:
import arcpy, os
...
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1answer
470 views
How to clip mesh files with a mask, and calculate the (3D) area of triangles inside?
I have a georeferenced mesh produced by photogrammetry software such as Agisoft Photoscan. Within this mesh, I have some areas of interest, which I can define with 2D vector masks (on the x and y ...
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0answers
42 views
Extract raster data by feature attributes/elements
I have a DEM raster, and a shapefile consisting of ~20 lines of steepest descent, created from the "flow Path Tracing" tool in Arc Hydro. Though the lines are all in the same shapefile, I wish to ...
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4answers
94 views
Clip a shapefile, given a set of coodinates
I need to clip a shapefile, the same way one would use Extract by Polygon on a Raster to achieve a smaller subset of the shapefile. I have previously exployed Extract by Polygon on a Raster and used ...
5
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1answer
343 views
Displacement when clip raster by shapefile
I run a script to clip raster by shapefile. Even with layers own the same crs (epsg: 4674) the output raster be displaced. I didn't find out in my script what is caused the error.
Here is my code:
""...
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1answer
47 views
Extract by Mask produces large box
I am using ArcGIS Pro 1.4. I have a shapefile with the boundaries of the countries in Sub-Saharan Africa which I am using as the mask. The raster is a land use data set. When I run Extract by Mask ...
5
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2answers
985 views
Mask pixel values in Raster image QGIS
I am looking at classifying an image to identify crop types.
I am interested in masking out all other landcover classes except crop class in the band stack false colour composite image e.g. buildings,...
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0answers
53 views
Function “Extract by Mask” in batch mode - just one resulting layer
I would like to clip 25 raster layers with self-made polygon using "Extract by Mask" function. The problem is that I am still receiving just one processed layer, instead of 25 processed layers. ...
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1answer
1k views
Building Masks (0-1 binary image) out of ROIs in Envi Classic?
I have the following 701x551 image in Envi with the shown raster ROIs (By pressing pixelbutton of ROI Tooldialogue window, I've converted the ROIs into raster format but I have access to ROI vectors ...
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1answer
1k views
Clip raster by mask without change values
I am clipping raster by mask with python. My input raster owned Float32, however the output of clipping was Byte.
I don't know why? I suspect that transformation of tif to numpy.array is changing ...
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0answers
129 views
Summing pixel values within polygon zone in ArcGIS Desktop? [duplicate]
My question is the same as Summing pixel values within polygon zone in QGIS? but I'm working with ArcGIS and not QGIS.
I have a raster data set with values of type float.
And a polygon ...
2
votes
2answers
728 views
Clipper in QGIS with Python Script
I want to use clipper function over a raster layer with the help of mask layer (.shp file) which will produce a clipped raster layer.
How this can be done with Python script?
I used this script:
...
0
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1answer
207 views
Landmasking in SAR geotiff image?
I am working on masking land in a SAR geotiff grayscale image. The image is a tilted one and as I am new to this field, I do not know how to proceed.
Also, I searched about rsgislib which provides ...
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1answer
92 views
ArcGIS extract by mask improper output for polygon with gaps (holes) inside
I'm working with ArcGIS 10.1, and I have used a polygon with gaps (holes) inside it. Extract by mask gives an improper output with removing the horizontal section of the image where those holes are ...
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3answers
4k views
Avoiding Extract by mask error 999999?
I am iterating through ~300 raster tiles, using a polygon feature class to extract by mask. The model successfully processes the first ~100 tiles and then I get the following error on the same tile ...
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1answer
313 views
Extracting some part of a satellite image using mask?
I'm trying to extract some part of a satellite Landsat-8 image. using another image.
I have the following satellite image:
and I want to keep only the areas from the satellite image which are ...
