Questions tagged [masking]
Covering or hiding features on a map.
367 questions
0
votes
0
answers
82
views
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 ...
- 23
0
votes
1
answer
449
views
Output raster of rasterio.mask doesn't match CRS of input [closed]
I'm trying to mask a raster with population data with my area of interest. I reprojected the original population raster according to the AOI's crs, but after masking and writing the new file, the crs ...
- 35
1
vote
0
answers
367
views
Quality Control process for MODIS Leaf Area Index in GEE
I am trying to mask certain features from MODIS LAI image such as cloud cover and image quality. MODIS LAI has two quality control measures - FparLai_QC and FparExtra_QC. I tried doing it with the ...
- 87
1
vote
0
answers
83
views
Masking non-vegetation areas in image
I'm having a little trouble masking non-vegetation areas in my images.
I'm using Sentinel-2 images, and I have land use and cover across my country (Brazil). To this end, I reclassified this land use ...
- 11
1
vote
1
answer
366
views
Indexing Sentinel 2 image collection using several conditions
I want to mask water bodies with two different conditions and then add the two indexed layers together to create one layer with different values of 0 (no water), 1 (water: based on index 1), 2 (water: ...
- 45
4
votes
0
answers
292
views
Merge rasters and clip by a shapefile
I was wondering how to merge multiple TIFF files together and clip the mosaic by the bounds of a intersecting shapefile. I've been able to merge them and output as a .tiff, but am not sure how to to ...
- 41
0
votes
1
answer
77
views
Looping with a variable r.mapcalc GRASS GIS
I want to crop a raster based on another one, inside a loop. I created a mask (MASK) and then cropped the old raster (old), creating a new raster (new).
r.mask vector=EU@PERMANENT #my mask
r.mapcalc &...
- 323
1
vote
0
answers
1k
views
Earth Engine: Landsat 8 QA_PIXEL issues with cloud, shadow, and land masking
Using the QA_PIXEL band in Landsat 8 to mask out clouds, cloud shadow, and land often masks out large areas of water. The QA_PIXEL band identifies these water areas as land and cloud shadow, when this ...
- 151
0
votes
1
answer
292
views
Change missing areas value(0) to other in Google Dynamic World Landcover Yearly Mode Mosaic to not mix with water class (also 0)
When I create a yearly mode mosaic using Google Dynamic World Landcover Data, the areas with missing landcover values especially in high Himalayan regions(perhaps due to the 35% cloud threshold) are ...
- 29
-1
votes
1
answer
3k
views
Masking raster based on vector shapefile [closed]
For this work Data are obtained from:-
For Raster:-https://download.hermes.com.np/land-cover-map-of-nepal-2010/.
For Vector :-https://cellapp.co/download-nepals-new-map-vector-image/.
Rupandehi ...
- 311
2
votes
1
answer
158
views
Use polygon lines to create masks
Given a tile (the cropped base map in the left) and polylines (red lines), is there any tool/workflow in QGIS to convert them into masks in the right?
- 55
1
vote
2
answers
920
views
Delete single pixels (noise) from raster
I have a raster layer (based on Landsat (30x30m)) of newly emergent lakes after spring snowmelt and subsequent runoff. These are stored in a raster layer. When I look at it, there is a lot of noise (...
- 917
6
votes
2
answers
10k
views
Creating polygon mask in QGIS
In QGIS 3.22.5, is there possible to use polygons for the masking layer?
I want to use numerous little polygons to mask lines (only layer which consists of lines).
In ArcGIS that works just by ...
- 61
0
votes
1
answer
2k
views
Google Earth Engine Creating a mask for an ImageCollection
I'm using Google Earth Engine's JavaScript API to process Sentinel-2 images. I've calculated the EVI from the Sentinel ImageCollection, and would like to apply a mask that removes all the values ...
- 301
2
votes
1
answer
772
views
Why is my combined Mask masking different areas to the individual Masks over an ImageCollection?
I'm trying to perform a time-series analysis of Sentinel-2 satellite imagery over Water, and to do that I've been muddling through using functions to perform analysis on images over an Image ...
- 153
1
vote
1
answer
1k
views
Masking clouds on Landsat8 with Python before NDVI [closed]
I'm new to remote sensing and trying to mask clouds with Python. I'm using the same method in Earth Data Science website (https://www.earthdatascience.org/courses/use-data-open-source-python/...
- 25
0
votes
0
answers
605
views
Error when trying to mask raster to shapefile after interpolation using R - "sp supports Z dimension only for POINT and MULTIPOINT"
I am trying to mask an interpolated raster to a shapefile with the same coordinate reference system using R, but I keep getting an error. The error is shown below. How can I overcome this error and ...
- 101
1
vote
0
answers
303
views
Getting Rid of Black Boundaries from Tiff Image using Google Earth Engine
I'm getting a tiff image from earth engine using the code below, but the image I get is rectangular and surrounded by a black box.
How can I get rid of the black boundaries on the corners and get a ...
- 39
0
votes
1
answer
535
views
Clip data while reading file into Python with GeoPandas
Geopandas is able to read in only part of a file using:
roi= geopandas.GeoDataFrame(geometry)
indexed_data = geopandas.read_file("path-to-file", mask=roi)
or
geopandas.read_file("path-...
- 71
1
vote
1
answer
3k
views
Mask Sentinel-2 image using SCL product in Google Earth Engine
I need to create a Google Earth Engine (JavaScript API) function to mask the pixels corresponding to no_data, satured_or_defective, dark_area_pixels, cloud_shadows, unclassified, ...
- 1,044
1
vote
2
answers
821
views
"Clip vector layer by mask layer" algorithm stucked in QGIS
I am using QGIS 3.22 and I try to use a mask to get rid of the part of the shapefile I don't want. However it stays stucked (see img) without even pointing an error.
Does someone know what to do? I ...
- 447
4
votes
1
answer
984
views
Cloud mask algorithms for Sentinel-2 Level-2A data
I am trying to find the best Sentinel-2 cloud mask algorithm for Level-2A data that can be integrated in a Python script and that works well on oceanic areas.
I am working with level-2 data because I ...
2
votes
1
answer
208
views
Rasterio mask washing out result
Using the rio.mask.mask function to clip out a section of an ortho. The result .tif looks like it has been "washed" out. The pixel values from the ortho and the result are exactly the same, ...
- 1,390
2
votes
3
answers
11k
views
Masking with rasterio in Python
Introduction
I have a shapefile for my area of interest (which in this case is Tehran) and also a TIF file that contains the categorical information(cloud status). In this case, I want to mask the TIF ...
0
votes
1
answer
82
views
Find the min. distance of each pixel to a connected component
I have a matrix in a similar format to the following
a = [1, 1, 0, 0;
1, 1, 0, 0;
0, 0, 0, 0,
2, 2, 2, 2]
This matrix represents a mask over a region, where each connected component ...
- 103
1
vote
2
answers
217
views
Unable to mosaic raster bands of the same region in ArcGIS Pro
I am trying to mosaic the Landsat satellite imagery of an ROI to fill the masked cloud regions. For this, I am using f1023clip and f5163clip (as shown in images below).
I am trying to mosaic the two ...
1
vote
1
answer
116
views
Retrieving State Heightmaps (DMTED) - Accuracy possible with QGIS? - Requesting Steps
I need a gmted2010 height map of Massachusetts. Only Massachusetts, including its shoreline, islands, and of course state boundaries.
What I am currently doing, in bullet point form:
I am using https:...
4
votes
1
answer
1k
views
Masking FeatureCollection using image in Google Earth Engine
I have a FeatureCollection with my study area, and an image with urban areas. I want to remove the areas in my FeatureCollection where the image has urban areas. How can this be done?
var studyArea = ...
- 41
2
votes
1
answer
4k
views
Rasterio mask doesn't work with shapely polygon
I have raster which I want to mask with shapely polygon.According the rasterio documentation, rasterio.mask can work with shapely geometry.However, in this case, it doesn't work.
whenever I use my ...
- 2,215
1
vote
0
answers
42
views
How to get novalue data of xyz points
I have multibeam and single beam xyz points.
I am looking to do the exact same process as Patch over raster A with values from raster B where raster A values are nodata in GDAL as I want to infill the ...
- 23
3
votes
1
answer
464
views
Substracting a lake from my DEM using QGIS
I got a rather small DEM which includes a lake. If I want to calculate the strahler order, flowaccumulation etc. it's calculated wrong. The lake "doesnt exist" in my DEM so I got the values ...
- 31
1
vote
1
answer
651
views
How to export masked MNDWI raster from Google Earth Engine
I am working with Google Earth Engine and the wonderful geemap package to export channel centerlines using Modified Normalized Difference Water Index (MNDWI; Xu, 2006). Computing the MNDWI is simple ...
- 51
1
vote
3
answers
6k
views
Error when clipping raster by mask layer (polygon) in QGIS
I'm using QGIS 3.14.16-Pi and I'm trying to clip a raster layer by a multipolygon layer representing a network of protected areas.
My raster has 4 categories of values: -3, -1, 0 and 2.
I've tried ...
- 127
0
votes
1
answer
30
views
Get extent error in for loop but not individiually
I am masking and cropping a rasterstack to a shapefile I made. I have done this previously with another shapefile, this is no problems. However, when I do this with this specific shapefile I get the ...
- 33
0
votes
1
answer
766
views
How can I replace masked pixels by another image
How can I replace masked pixels with another image?
I have two sets of images: Image_A and Image_B, each has 10 bands.
I want to change the masked pixels in Image_A by the corresponding (same band, ...
- 179
0
votes
1
answer
972
views
Convert mask band to binary image in google earth engine
I have created a mask band giving several band thresholds but I am unable to use this band for validation as there are no pixels outside the mask. So I would like to make a binary image with one value ...
- 131
0
votes
0
answers
63
views
Random-points-from-Classification tool (EnMAP-Box plugin) - Adding mask option by python? (QGIS 3.16, Win10)
I created random-point-vector-files from a classified rasters with a given number of points per class by the Random points from Classification tool (EnMAP-Box plugin). But, now I'd like to exclude ...
- 507
0
votes
1
answer
157
views
Mask fire scars across a collection of images and combine them into one singular image
I am a GEE and JavaScript novice.
I am trying to calculate a specific fire index for a collection of sentinel 2 images so as to map burn scars throughout a one year period. I then want to apply a mask ...
- 13
1
vote
1
answer
1k
views
Create Binary Layer from a shapefile
I have an image Image.tif and a shapefile Water.shp (Several polygons) such that the polygons are all in the images boundaries.
I want to create a binary layer such that the layer has a 1 value on the ...
- 13
1
vote
1
answer
425
views
Exporting an inverted polygon in QGIS outputs a NON-inverted polygon
I am trying to export an inverted polygon layer to a GeoJSON in QGIS 3.16.1 Hannover (using same process to this) but everytime I export and save it, the output is NOT an inverted one.
I'm trying to ...
1
vote
1
answer
946
views
Using MOD11A1 bitmask to select "Good Data Quality" pixels for further LST time series generation in Google Earth Engine
I'm trying to generate a daily LST time series over a region by selecting only the good quality pixels. The code I've written is attached below along with the dataset description. My aim is to select ...
- 57
1
vote
1
answer
839
views
Iterating to calculate mean NDVI and mask pixels having greater than mean NDVI value of each image in image collection using Google Earth Engine
I am working on Sentinel -2 image collection over my study region in Google Earth Engine. I can calculate Mean NDVI for an image using ee.Reducer.mean() and mask pixels using update mask .gt(mean ...
- 131
4
votes
2
answers
213
views
Removing overlapping margins on multiple rasters by clipping to polygon grid
I am using ArcMap 10.8
I have multiple digitized historic General Land Office (GLO) maps (JP2 rasters) that I am georeferencing. Each one aligns with a single rectangular feature within an existing ...
- 101
2
votes
1
answer
2k
views
Google Earth Engine: what does it mean by mask an image with itself?
I am a newbie and following the GEE tutorial at this link:
https://developers.google.com/earth-engine/tutorials/tutorial_api_05
I do not understand the following line of code under the section of ...
- 51
1
vote
1
answer
1k
views
Mask out pixels of erroneous NDVI values in GEE
Here is my code in GEE to attempt this. NDVI values should range from -1 to 1, but because there are some bad pixels in the image, I have a few random values, such as -145 or 25. I am trying to mask ...
- 51
2
votes
1
answer
295
views
How to only see a land mask of a whole area, inside just the raster in QGIS?
I have a land mask that covers a larger area, but which I only need to see inside my RADARSAT image.
Here you can see the image with the land mask, but it is also covering an extent outside the image. ...
- 29
2
votes
1
answer
1k
views
Sentinel-2 Multiband thresholding (masking) using Google Earth Engine
I want to extract wheat pixels from the sentinel 2 image in google earth engine. Based on field analysis pixel should satisfy 3 conditions: NDVI value between 0.6 to 0.7, NDWI value between -0.5 to -0....
- 131
0
votes
1
answer
607
views
Creating forest mask using PALSAR Forest/Non-Forest Map for Sentinel 2 image collection
I trying mask forest areas in Sentinel- 2 image collection over my study area using the 25m resolution global PALSAR Forest/Non-Forest Map. I followed the masking example given in GEE guides that uses ...
- 131
1
vote
1
answer
580
views
Masking satellite data using shapefile
I am using Landsat data to determine NDVI for a specific region of interest (roi). However, the roi has buildings and other artificial objects that I wish to mask.
I have followed through the example ...
- 23
0
votes
1
answer
518
views
Sampling areas based on water mask using Google Earth Engine
I am trying to sample a large image and I only want to keep points that fall within a water mask.
I can successfully sample small numbers of points by using a mask, but the algorithm chokes at larger ...
- 168