Questions tagged [masking]
Covering or hiding features on a map.
367
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Clip raster with mask layer, but retain the unclipped areas
I want to clip a raster with a mask layer that consist out of several polygons to remove unwanted areas. The resulting rater that I am getting retains the areas within the polygons. I want to obtain ...
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1
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43
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Pearson's Correlation for Masked Images in GEE
I'm trying to calculate and plot correlation coefficients between two Image Collections, which are monthly NDVI and MODIS hotspot counts (where hotspot counts represents the number of times a pixel ...
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32
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GEE applying raster Mask misses pixels and won't align with target image
I am trying to mask an image in GEE by a raster image. Value 1 corresponds to presence of trees and 0 absence in a 30x30 resolution. However, all pixels are masked when they shouldn,'t, as I ...
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Google Earth Engine updateMask() with a mask of finer resolution gives strange results
It seems updateMask() will keep the projection of the original image. However, masking the original image with a finer resolution image produces strange results in the following calculation.
As the ...
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56
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Remove pixels from a raster in QGIS
I have a raster map and I would remove isolated pixels or groups with less than 4 adjacent pixels. How can I do it in QGIS?
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35
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Unexpected output from masked area calculation in Google Earth Engine
Using a 500m MODIS burned area dataset in GEE, I want to find the area burned in a period of time (say, a few months). Specifically, I want to find the area of pixels that have burned one or more ...
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57
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Replacing values in a raster using a mask in Python
I have a tiff-file with three color bands that I want to mask in Python using a shapefile, but when I use the normal masking method with rasterio, the data points under the mask are replaced with (0,0,...
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Keep nan values when resampling using GEE and Python
I'm processing MODIS GPP data using GEE and python. The issue is the resolution of MODIS is very coarse so I need to upsample it using, for instance, bilinar resampling. The problem is MODIS contains ...
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Process the img1 using the img2 which contained with only 0 and 1 to keep the raster corresponding 1 and erase the raster corresponding 0
How can I use an image with only 0 and 1 to process another image, so that the original image value corresponding to the 0 value area becomes 0, and the value corresponding to 1 is preserved? Is there ...
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1
answer
34
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Trying to create mask to eliminate false NDVI numbers in GEE time series analysis using Sentinel data
It keeps given me the error that ndvi.gte is not a function, I shared my code below:
var images = sentinel.filter(ee.Filter.date(startDate,endDate)).filterBounds(geometry)
print(images);
var ndvi = ...
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1
answer
100
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Deleting or hiding features in QGIS in one layer based on the value of the feature in another layer
I have two tiff-tiles which are maps of the exact same area:
One of them displays the height of each cell in the area while
the other displays an identification number of the same cells.
What I was ...
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Mask get wrong value
While trying to see if 2 images share some matching pixels I try to implement the mask() function.
In order to do so I used image1.mask(image2)
Here is an example :
Mask of Image 1 :
Mask of Image 2 :...
3
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1
answer
263
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Adding simple Geomasking (Donut masking) feature using PyQGIS
I would like to add a simple halo masking feature/plugin in QGIS. Halo/donut masking basically transforms (shifts) all points in a layer to a random distance between two user-provided distances. ...
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38
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Adding pixel-level classification to ee.ImageCollection
I am working with ee.ImageCollection('LANDSAT/LE09/C02/T1_L2') data pulled from earthengine-api in Python.
I have previously defined a function to mask cloud, shadow, water, and snow. based on the ...
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98
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AttributeError: NoneType
I have this code I use in the QGIS Python console. I used it a few days ago and it worked, but I tried using it again and I got this error:
Traceback (most recent call last):
File "C:\PROGRA~1\...
4
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3
answers
847
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Inverted Polygon in ArcGIS Pro
Back when I used QGIS, I symbolized with the 'Inverted Polygon' setting all the time. Mostly it was to create a half-opaque mask around a feature that I wanted to pop out more prominently, but I can't ...
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Does MapServer allow to set up empty tiles as a return of a webapp request for data outside of the layer mask in MapServer?
Is it possible to set up empty tiles as a return for webapp request of a data outside of the layer mask in MapServer ?
I have a MapServer-based webapp with a layer that uses a mask option to limit ...
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57
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How do I batch-assign NoData values?
I have a number of rasters I need to mosaic together. The areas with data are within a rectangular "nan" envelope. The "nan" envelopes of different rasters overlap each other. No ...
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1
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301
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Google Earth Engine Water Mask and keep non water area
I'm pretty new at GEE.
I want to mask only the water areas for my study area. I want non-water areas to retain their pixel values. For this I detected and masked water areas with NDWI. However, after ...
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26
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How can I update this function to block out values of NDVI that are greater than or equal to 0.1?
Really new to JavaScript and Google Earth Engine, sorry if formatted badly. I am wondering if there is a way to only calculate an NDVI value that is greater than 0.1 in my .addBands line. If not, how ...
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2
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427
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How to mask bands of an image based on values of one of the bands using numpy and gdal
I have a raster with two bands, and I want to mask both bands to get data where band "yod" has a value of 2011 and export a new tif file with the same two bands masked.
The following script ...
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2
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269
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Mask GeoJSON with nested Polygons/Nested donuts
How would I mask a geojson that looks like this
{"type":"FeatureCollection","features":[{"type":"Feature","geometry":{"type":&...
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Masked raster is completely black when reprojecting and masking in GRASS GIS
I have a global raster of railways networks in Mollweide CRS (resolution 1000x1000) and I want to reproject it to Europe (EPSG:3035), crop it to Europe, and change the resolution to 30x30 km (0.25°).
...
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2
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71
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Naming clipped files from layer mask?
I have to clip a quite large raster (corn crops) into individuals rows. It's working fine with the "Clip raster by mask layer" tool with a grid I created.
However, I need the clipped images ...
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49
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Expanding QGIS mask Plugin query
When I select a polygon and I apply the QGIS plug-in mask to it then a buffer is created around the polygon.
The plug-in does this with the following expression in my case:
in_mask(31370)
Can I ...
4
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3
answers
819
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Use Raster Layer as a Mask over a polygon in QGIS
I have a raster layer, as seen on the attached image, that works as a background of my working area. The red line, that marks the limit between the two countries, is a .shp file that, naturally, goes ...
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176
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s2cloudless sometimes masking out fields
I have implemented the s2cloudless code as written in the official documentation. The only changes I did were:
Skipping the step where the median is calculated (I aim to do a time-series analysis);
...
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173
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Fully removing raster values that have been masked out
I want to fully delete the values to this suitability raster that have been masked out. When I apply the mask (feature layer -> appearance -> masking) the stretch does not rescale. It is ...
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128
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How to make multiclass color mask based on polygons (osgeo.gdal python)?
I know how to make binary 1-band mask in python with
osgeo.gdal.Rasterize(src, shp_file_name, burnValues=[1])
But what if I have several classes and want to make 3-band mask with different colors for ...
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0
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23
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Clip all polygons inside the boundary of provinces to separate and calculate every inside polygons area
I need to calculate area of polygons inside every province but some of polygons are not exactly inside of one province and part of it is in one province and the other part is in another province. How ...
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1
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768
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How to use Turf mask when Polygon has islands in inner rings/inner rings
I am getting some weird result with turf.mask().
This is the polygon I am trying to run the mask() function with: https://gist.githubusercontent.com/Stophface/50155878441205412001247878f58b63/raw/...
- 3,420
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42
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Get rid of GeoTIFFs that fall outside the boundary when adjacent GeoTIFFs overlap each other
I am currently working in ArcGIS Desktop 10.4 with data driven pages enabled. I have ten GeoTIFFs with some overlapping into other GeoTIFFs. I want to mask those that are overlapping so when I show a ...
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1
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358
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Masking in rasterio changes the values the output file
I am masking a raster file using rasterio. I am doing this using the mask function. The result of the masking changes the value of the pixels when loaded to GIS.
import fiona
import rasterio
import ...
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838
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Mask NetCDF data in Python with shapefile
Precursor to this question: Masking NetCDF data with a shapefile in that has more than one variable Python. Note: Data files are in the previous question.
I am trying to mask my polygon but I don't ...
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142
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Turf.js with multiple webworkers for point transformation 48 core CPU
I need to split a GeoJSON file to multiple parts engaging about 10 web workers to do some point transformation using turf.js. Afterwards, the returned processed data will need to be appended to form ...
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189
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Split categorical image into multi-band image in Google Earth Engine, where every band only contains pixels from one category
Context
I need to calculate the yearly forest area lost for every country, based on the Hansen Tree Cover Loss (TCL) image. The band I use is categorical and indicates the lossyear in the form of an ...
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1
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51
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Stacked image created, while most of the bands became masked
I am trying to do a crop-type classification, so I created a stacked image from my collection for training by RF. However, when the collection is stacked, most of the bands inside the stacked image ...
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1
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230
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How to get rolling count of masked pixels in Google Earth Engine
Using the Global Forecast System from NOAA, which provides relative humidity (RH) estimates several hours in to the future (up to 16 days to be exact). I create a binary of the RH, call it leaf ...
- 377
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2
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385
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Sample Regions - excludes points with masked bands. Google Earth Engine
I have a set of points from around the world and I want to extract the pixel values from a set of images, giving information about the local environment, for each point. Then export the set of values ...
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63
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Raster masking keep old extent
I want to clip a raster file using for mask other raster file and in SAGA GIS provider tool QGIS QGIS Processing | Raster Tools | raster masking .
I realized the new masking file keeps in the ...
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72
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Fixing errors in old DTM in QGIS
I'm currently working on fixing some errors in some old DTMs.
The issue is there are pixels with a value of "-1.4013e-45" which are all over the rasters. I'm looking for a way to remove ...
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2
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413
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rasterio.fill.fillnodata doesn't work as expected
I have a DEM of a lake bottom, that contains a few holes (nodata) which I'd like to fill. For that purpose i'm using rasterio's fillnodata with a mask. Unfortunatly, I don't get the results I am ...
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375
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Google Earth Engine: can I use multiple masks?
I am trying to use GEE to get temperature rasters. I am using the Daymet data, pulling every day of the year in 2011 in a county in New York, USA. I want to exclude temperatures less than 10 C and ...
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1
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60
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Delimit the loading "zone" in a shapefile
I have to make several atlases of a large region in France. My study area is relatively small compared to the entire region. However, most of my layers are related to the entire region.
As I intend to ...
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1
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How to mask everything but a polygon in QGIS?
I am able to draw polygons over areas of interest in QGIS. For example via: Layer -> Create Layer -> New Temporary Scratch Layer, name the layer, select Polygon as Geometry type, OK, select the ...
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Clip a GeoTIFF based on a bounding box coordinates using rasterio
I would like to clip a geodaframe based on coordinates. Let's say that I have the following bounding box from a GeoPandas dataframe. The projection is mollweide.
gdf.boundary.plot()
gdf.total_bounds
...
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241
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QGIS - Label masks breaks layer on PDF export
I have a contour lines layer with index labels, which uses masks, it works correctly on the editor and composer as seen below
When exported the layer goes past map boundaries and it's style breaks.
...
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581
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Clipping raster by raster (0-1 range) using QGIS
I am supposed to clip 6 raster files of Europe by a raster of agricultural land in Europe (mask layer). Initially, to do that I vectorised my mask layer and then clipped the rasters by that. It seemed ...
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Remove inner side of mask layer from raster (equivalent of clip raster by mask for the inner side, instead of outside) [duplicate]
Objective:
Clip raster by a mask but remove area interior to the mask (instead of the default exterior area, when using clip raster by mask)
Details of Attempts:
Clipping raster using the outer ...
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72
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Create new shapefile layer per raster layer
In QGIS i have several hundreds raster tiles. For a deep learning application i would like to create segementation masks. To achieve this, my approach is to make a new shapefile, create the polygon ...
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