Questions tagged [masking]
Covering or hiding features on a map.
355
questions
0
votes
0
answers
117
views
Function to remove borders and clouds from SENTINEL2
I've been trying to test SENTINEL, and found some functions to clean the clouds and edges of the images, but I do not understand exactly how this function works, and I'm very curious to understand ...
- 117
6
votes
1
answer
871
views
Writing masked GeoTIFF in rasterio and visualizing in QGIS?
I have an interpolated raster, which is a masked array, that shows where the data is valid. I want to save it as masked TIFF with rasterio.
To test, here's the JSON file, and the code:
import rasterio,...
- 2,314
2
votes
2
answers
5k
views
Rasterio error: Input shapes do not overlap raster but reprojection not working
I'm trying to use rasterio (v1.0.13) and fiona to perform a raster clip on a geotiff using a geojson polygon. For reference, the clip works perfectly from the command line using GDAL:
gdalwarp -...
- 221
2
votes
1
answer
481
views
How I get the masking area data and export data in Google Earth Engine?
Here is my code in GEE:
var CO = ee.ImageCollection('COPERNICUS/S5P/OFFL/L3_CO')
.filterDate('2018-07-04', '2018-07-05')
.select("CO_column_number_density");
var CO_merged = CO....
- 21
1
vote
1
answer
2k
views
Google Earth Engine: Problem with the updateMask function
I'm trying to use the updateMask function in GEE but I'm not quite sure how to use it in this occasion. So i did a trend analysis with formaTrend() to analyze the loss of forest cover in an area:
...
- 156
0
votes
1
answer
385
views
Resample rasters after buffering in R
I have a raster stack that has NULL values from applying a focal buffer. They're not NA values but 0. Each layer shares the same extent, but the layers with the larger buffer widths have more 0 values ...
- 312
2
votes
2
answers
1k
views
Masking random pixels in an image
I have a feature collection that is used as input for a model. In order to validate the model, I would like to mask a random percentage of pixels from each image, i.e. splitting the feature collection ...
0
votes
1
answer
913
views
Vectorizing large-scale binary layer in Google Earth Engine?
I would like to vectorize binary raster layers in Google Earth Engine in order to be able to use the geometry of the resulting FeatureCollection in other tasks (e.g. clipping data or similar things).
...
- 1,156
2
votes
1
answer
2k
views
Masking GeoTIFF file after GeoJSON through rasterio - "Input shapes do not overlap raster"
So my intention is quite simple:
I have a 4-Band TIFF file I want to crop after a polygon shape. However, I'm getting the following two exceptions
WindowError: windows do not intersect
ValueError: ...
0
votes
1
answer
602
views
ENVI 5.1 - ANN Classification - Background was classified into one of the class
I'm new to Remote Sensing and I'm having trouble in ENVI 5.1 where the background was classified as one of the classes in the ROI I used, which is not right. How can I exclude the background or at ...
- 1
0
votes
1
answer
295
views
R: Annual composite based on the median: How to get the index of the original layer for each pixel?
What I want:
I have a list of rasterstacks which are timeseries (300+ layers) for different bands. The timeseries are irregular, and therefore I want to create annual composites based on median ndvi. ...
- 3
1
vote
0
answers
360
views
Summarising all the (NDVI) values pixelwise for a masked polygon
A .tif image has been created using the NDVI formula in QGIS. The resulting image shows a region, with varying grades of NDVI values over the image. A .shp file has then been created for an area of ...
- 111
0
votes
2
answers
257
views
Some edges of raster switch to a value of 0 when clipped and pixels are shifted on QGIS
I am trying to clip trees out of a raster layer using polygon I've traced around them. I've created one polygon that I've copied for each tree so that each clipped raster contains the same width and ...
- 715
1
vote
1
answer
1k
views
Draw a mask on a TIFF file
I have a raster (TIFF file) and I would like to draw a mask on it.
So, I basically create a shapefile and draw polygons on the area I wanted to mask.
Then, I would like to rasterize this shapefile by ...
- 181
1
vote
1
answer
2k
views
Hiding polygons outside of current atlas feature in QGIS? [duplicate]
Within the above image, I would like to ideally hide the polygons outside the current atlas feature (some to the east and also to the west - these are part of other atlas features)
They are currently ...
- 875
3
votes
1
answer
227
views
Get pixel values from a raster using a multipartpolygon
I'm trying to get the mean value of pixels from an NDVI raster, that intersect the geometry of a FeatureCollection, that is a multipart polygon which represents my sample area, but I can't find the ...
6
votes
0
answers
3k
views
Make a grid map in Leaflet
I want to draw a grid map based on the temperature values in Leaflet.
Similar to the illustration below.
Input data: lat, lon, temperature values, cities' names
Parameters: the dimensions of the ...
- 81
1
vote
3
answers
1k
views
Sequential cloud mask closest to date in Google Earth Engine
I'm interested in transitions that occur on a date, such as bushfires. I want to get the closest (in time) cloud-free landsat image possible using as many images as necessary in the collection up ...
2
votes
2
answers
3k
views
Creating opacity mask in Google Earth Engine?
I have an NDSI snow layer loaded in Google Earth Engine. Since snow is present for values <0.4, I want to make values >0.4 opaque. I looked at the manual's examples, but this code is not giving me ...
- 503
1
vote
0
answers
371
views
Does anyone know why I'm getting a completely black geotiff as a result of this shapefile cut out of another geotiff in rasterio?
I am using rasterio to cut out the shape of a lake outlined in my shapefile from a geotiff. When using a shapefile of a singular lake with a geotiff, this works perfectly, but not when cutting out a ...
0
votes
1
answer
1k
views
Apply a mask to multiple images(for same geo location) in a image collection
I have a image collection which holds multiple images of the same area. I can apply mask individually to those images but how do I apply a mask to all the images in the collection. Say the mask i have ...
- 101
2
votes
1
answer
165
views
Improving mask in QGIS?
I have created a mask with the NIR band to separate earth from the sea.
How can I delete little spot area (errors) in the mask or change the pixel value of these spot areas ?
3
votes
1
answer
262
views
Masking LiDAR points to create DEM in ArcGIS Pro with ArcPy?
I have an irregular LiDAR point cloud dataset, so when I try to create a DEM or DSM, the points are connected across the irregular edges of the LiDAR point cloud.
I thought that creating a mask ...
- 1,873
6
votes
1
answer
598
views
Stacking and masking Landsat at the same time with rasterio
Based on answers from previous questions 1,2 and the Masking a raster using a shapefile guide from rasterio cookbook, I wrote the code below.
The code runs correctly. I would like to improve it.
1- ...
- 139
0
votes
0
answers
38
views
Creating cloud feature after applying Landsat8 Cloud Masking [duplicate]
There is a script in GEE to mask cloud:
// This example demonstrates the use of the pixel QA band to mask
// clouds in surface reflectance (SR) data. It is suitable
// for use with any of the ...
0
votes
1
answer
1k
views
Cloud mask using pixel_qa
I need to create a cloud mask using the pixel_qa band, this is the code that I have so far:
var city = ee.Geometry.Point(9.15, 45.18);
var landsat8 = ee.ImageCollection('LANDSAT/LC08/C01/T1_SR')
// ...
1
vote
2
answers
1k
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 ...
- 19
1
vote
0
answers
233
views
masking in ENVI [closed]
I have surface reflectance generated NDVI which I got from ESPA interface, https://espa.cr.usgs.gov. How do I mask cloud with Qa band in ENVI?
- 11
2
votes
1
answer
3k
views
Landsat 8 cloud/cloud shadow/snow masking in Google Earth Engine [duplicate]
I am a new Google Earth Engine user and I am trying to understand basic procedures/functions. More specifically, I want to remove clouds, cloud shadows and snow pixels form a Landsat 8 collection and ...
- 604
1
vote
0
answers
81
views
Applying a mask when running MESMA using VIPER tools plugin for ENVI
I am running MESMA on a landsat image that has large areas masked out, but I keep having all the background (value = 0 in all bands) pixels included in the analysis. They all end up unmodeled (no ...
- 11
1
vote
1
answer
2k
views
Union polygons in QGIS
I have two shapefiles. One contains a raster with grid cells and the other administrative boundaries.
I would like to union the polygons from both layers but geoprocessing - union yields the ...
- 499
0
votes
0
answers
108
views
Is it possible to create an average image of the analyzed period after the removal of the clouds to fill the flaws in the images?
// study area
var local = ee.Geometry.Rectangle([-42.2974, -20.5299,-40.9406, -19.1815]);
Map.addLayer(local);
var landsat8 = ee.ImageCollection('LANDSAT/LC08/C01/T1_SR')
// Fmask classification ...
1
vote
1
answer
4k
views
How to apply a Cloud Mask in Google Earth Engine? (Landsat 5 TM 8-Day NDVI Composite)
I need to download ndvi values for some pixels for 2000-2001 using the Landsat 5 TM 8-Day NDVI Composite, but since there is no quality band as in mod13q1 there's no way to filter by quality. ...
- 69
1
vote
1
answer
939
views
Extrapolating with IDW (Feature Classes) in ArcGIS Pro?
I have been struggling to extrapolate beyond the extent of the point features input into the IDW tool of ArcGIS Pro.
I believe IDW interpolation is the method for me, i just need the process to ...
- 103
2
votes
0
answers
1k
views
Apply mask and compute statistics with GDAL
I've constructed a VRT that includes a band of data and a mask (0/1 representing water/land) with:
ds = gdal.Translate(masked_vrt, combined_vrt, bandList=[1], maskBand=2, format='VRT')
Where ...
- 419
2
votes
0
answers
57
views
ArcMap 10.5 Desktop: Highway shield test symbols not respecting mask layer about it
How do I stop highway symbol markers from appearing above my mask layer?
The actual highway layer is below the mask layer in the drawing order (so the actual highway line appears below the mask layer,...
- 21
0
votes
1
answer
480
views
Apply mask in bulk ENVI
I have a stack of MODIS images consisting of 400+ bands. A stack of NaN masks is created corresponding to each layer of the MODIS stack. I wonder if there is a way to apply the mask layers in bulk in ...
- 135
1
vote
0
answers
131
views
Applying mask to Kriging shape in ArcGIS Desktop?
I'm trying to apply an mask to a Kriging image for after apply a Density Sampling Network, but unfortunately I'm not getting good results.
I tried to apply on mask on Density Sampling Network and is ...
3
votes
0
answers
383
views
Expanding raster within mask by interpolating it with boundaries set to 0
I'm having a hard time trying to expand a raster within a mask. Here are some details about my case:
I'm working with glacier ice thickness rasters, which happen to be smaller than the real size of ...
- 31
2
votes
1
answer
448
views
dismo::randomPoints generates NA points with raster stack mask
I am using the randomPoints function in the dismo package in R to generate random points from a raster stack. The documentation for the randomPoints function says:
"The points are sampled (without ...
- 23
1
vote
1
answer
1k
views
GEE cloud-free Sentinel2 and linear Regression [closed]
GEE, Sentinel and linear Regression
I am using GEE (Google Earth Engine) to compute a Sentinel-2 based change analysis. What I would like is basically a linear regression per pixel, with the slope as ...
- 57
3
votes
2
answers
8k
views
Sentinel Cloud-free Collection Google Earth Engine Code Editor
I am trying to create and map an image collection (not image or mosaic if that is even possible), where QA60 defines the Cloud-mask. I have written the code below - however, it seems the Jan2016 ...
- 57
0
votes
1
answer
116
views
Running MFmask in MATLAB: Error using imfill
I am trying to create a cloud and cloud shadow masking raster using MFmask (https://www.sciencedirect.com/science/article/pii/S0034425717303073) for a Landsat 8 scene. MFmask 1.1 is modified version ...
- 315
3
votes
0
answers
4k
views
Using polygons to create mask on 2d grid with Python?
I have some polygons (Canadian provinces), read in with GeoPandas, and want to use these to create a mask to apply to gridded data on a 2-d latitude-longitude grid (read from a netcdf file using iris)....
- 39
0
votes
1
answer
3k
views
How to convert to NoData in Google Earth Engine?
I have the next code:
I am trying to make a mask (only one shape that I would like to use as an analysis region) with: all elevations less than 4.100 meters (from DEM), all area with water (NDWI) and ...
- 373
1
vote
1
answer
2k
views
Rasterio.mask returns error 'shapes are outside bounds of raster' - but they are definitely within raster bounds
I'm using rasterio.mask.mask to mask a raster with a shapefile.
import rasterio
import fiona
image_object = rasterio.open('/home/cate/image_name.img')
aoi_shapefile = fiona.open('/home/cate/AOI....
- 123
5
votes
1
answer
2k
views
How to apply a Cloud Mask in a collection?
I am trying to apply a mask cloud in a SAVI collection (LANDSAT) to get a chart with time variations between pixels.
var region = table3
Map.addLayer(table3)
var col = ee.ImageCollection('...
- 373
2
votes
1
answer
302
views
Cropping maps (Raster source map and vector map as boundary)?
I have DEM named "HD_DEM" (asc file) and vector map for lakes that named "Lakes". I want to crop lakes from HD_DEM. By following instructions of this link https://grasswiki.osgeo.org/wiki/...
- 33
1
vote
1
answer
1k
views
Extracting QA Bits for Mask for Landsat Surface Reflectance?
I am trying to create a mask that I can map over an image collection using the QA band from Surface Reflectance data in Google Earth Engine. Here are the indicator bits for the QA band:
0:unused
1:...
- 53
2
votes
2
answers
2k
views
Merge two rasters with different resolutions caused by masking of areas
I've analyzed multiple regions separately using rasters. All those regions are neighbours. That means every pixel from one region has a neighbour from another region, like the picture below implies. ...
- 91