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Geographic Information Systems

Questions tagged [masking]

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179 questions
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1
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1answer
32 views

Mask water bodies in GEE

I'm trying to to detect changes in land surface over few periods in a specific polygon. The problem is that I want to block water bodies from my calculations. How can I do it? This is the code I ...
-2
votes
0answers
34 views

Reprojection issue; Input shapes do not overlap raster. Rasterio error

I am a newbie in geo data processing. I am struggling to clip a raster with a GeoJSON which is generated from Leaflet. I want to mask the Sentinel-2 NDVI tile with the GeoJSON. When I try to do it ...
1
vote
1answer
26 views

Uploading polygons and masking pixels inside the polygons using Google Earth Engine?

I am working on a classification problem on agricultural fields. To make things easier, I first identified road, cities, water, fields, and etc. I am planning to eliminate road, cities, and water out ...
0
votes
1answer
20 views

How to mask an area in ArcMap and run supervised classification on unmasked area?

I would like to just run supervised classification on my area of interest (all along the coastlines) and would like to know how to do this in ArcMap. I have created a polygon to mask out the area out ...
1
vote
0answers
22 views

Google Earth Engine: Masking land out of Sentinel-3 imagery

I'm trying to isolate ocean cover from OLCI imagery using a bitmask from the quality_flags band. But it's masking all the pixels, and I notice when I mask the ocean and leave the land, the land is ...
2
votes
0answers
26 views

Is there a way to interpolate lost data/lost pixels caused by cloud and cloud shadow masks in Google Earth Engine? [duplicate]

I'm sure cloud and cloud shadows have been, time and time again, a frustrating problem. Usually after masking the two, I composite multiple images (in a set time interval e.g. 2015-2016, months 6-8) ...
2
votes
1answer
49 views

Reducing file size by not storing no-data points

I have to compute sea wave forecast for large period of time. Land information is of no use here. Is there any file format that allows to not store no-data/fill values for land area to reduce file ...
0
votes
0answers
38 views

Filtering anomalous pixels from masked raster in Python?

I am struggling to succesfully filter out anomalous pixels from a Sentinel-1 image band mask (Pixel based), produced in Python. I am new to Python. By anomalies, in this situation, I mean ...
1
vote
1answer
40 views

Google Earth Engine Mask application

I'm using GEE in order to extract evapotranspiration (ET) data from MODIS (MOD16A2v6). I want to extract only ET band in order to make some further process. To do so, I apply some filters (like ...
1
vote
0answers
42 views

Why did not I manage to reproject layer?

I have a global land cover map, which has the following properties: Name ESACCI-LC-L4-LCCS-Map-300m-P5Y-2010-v1.6.1 Path C:\QGIS\ESACCI-LC-L4-LCCS-Map-300m-P5Y-2010-v1.6.1.tif\ESACCI-LC-L4-LCCS-...
0
votes
0answers
11 views

Why the Masking in ENVI does not give different statistical result

I want to run statistical band correlation of an image in ENVI. The image has been masked with polygon of interest, and shows no-data value outside the polygon. I expected that it calculated only the ...
3
votes
1answer
70 views

Creating water and vegetation mask via image collection?

I am a Java script and EE novice but I'm already a great fan of Google Earth Engine. I am simply trying to create a single NDVI and NDWI masked layer to work on. Below you'll find my Frankenstein of a ...
0
votes
1answer
75 views

How to set masked pixel value in Earth Engine image export

I'm using Earth Engine to preprocess and download some NDVI data. I used a region of interest to clip the imagery to a geometry, and values from the Summary QA layer to mask out pixels that were of ...
2
votes
1answer
30 views

Replacing masked cloud areas with another satellite image?

I have various Landsat images of which many are cloudy. Using the cloud masking plugin available in QGIS, I was able to identify and remove the areas with cloud and cloud shadows from every image. ...
1
vote
0answers
35 views

Raster masking with vector error in QGIS 3.6

I have a global glc-2000 raster map. I would like to clip it to study specific area. I used boundries of continents shapefile as mask. Both of them have same projection. Since I am beginner I have ...
4
votes
2answers
169 views

Masking layers by a vector polygon layer in QGIS

I have a vector layer of buildings: and a polygon layer coloured by some quantity: and I want to mask one by the other to produce this: This can be done by setting the blend mode to "Multiply" with ...
1
vote
1answer
21 views

Trouble with masking

I am trying to mask out a section of an image I created with an algorithm. I create a geometry of the section I want to mask out and clipped that with an image of 1's to create my mask image. But when ...
2
votes
1answer
25 views

Performing localized raster edits using ArcGIS Spatial Analyst?

I have a raster image of water depth, float point values 1-15, in a very small area some erroneous values are in the raster with values of 100 - 375. I'm looking for a repeatable work flow in ArcMap ...
1
vote
2answers
82 views

Visibility analysis with mask for non visible areas?

I have LiDAR data and I've made a Digital Surface Model (DSM): I've made a visibility analysis for 3 buildings with this model: My goal is to know from where the buildings are visible, not what do ...
0
votes
0answers
29 views

Missing raster data from masking with a spatial polygon layer in R

I am fairly new in R and I am trying to create a new raster by using a spatial polygon layer. I have the code written by using the mask function and the output is essentially what I want, but I'm ...
0
votes
0answers
35 views

How to mask a raster layer (interpolated surface) onto a polygon layer? [duplicate]

I have performed interpolation (IDW) for average monthly precipitation and temperature values for Europe. For my project, I'm focusing on the UK and Sweden so I'm wondering can I clip or mask the ...
2
votes
0answers
84 views

Sentinel 3 Cloud Masking in Google Earth Engine

I am new to GEE and I wanted to use this as part of my research. My first step was to mask the clouds off the images. The code i created basically mask out pixels based on the Quality Flag Bit 27, ...
0
votes
0answers
52 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 ...
0
votes
0answers
86 views

How delete delete or mask nodata 0 value in the mask

I have raster (with 5 bands) and shapfile in the same projection. I do this script for rastersize and do mask and clip raster or crop raster with mask but I need to have just clip raster without black ...
3
votes
0answers
143 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 ...
1
vote
2answers
353 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 -...
1
vote
1answer
43 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....
0
votes
1answer
75 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: ...
0
votes
1answer
54 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 ...
2
votes
2answers
196 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
1answer
137 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
vote
1answer
276 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
1answer
59 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 ...
0
votes
1answer
59 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. ...
1
vote
0answers
61 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 ...
0
votes
2answers
53 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 ...
1
vote
1answer
149 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 ...
1
vote
1answer
295 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 ...
1
vote
1answer
84 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 ...
3
votes
0answers
591 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 ...
1
vote
3answers
128 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 ...
0
votes
0answers
40 views

Rasterizing 3 dimensional dxf to mask netCDF?

I have difficulty in rasterizing 3 dimensional dxf (single building) to mask netCDF using GRASS, Blender, or Qgis. I want the mask netCDF to have value 1 in interior of the building and zero value ...
1
vote
2answers
496 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 ...
1
vote
0answers
53 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
1answer
261 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 ...
2
votes
1answer
129 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
1answer
111 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 ...
5
votes
0answers
168 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- ...
0
votes
0answers
26 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
1answer
246 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') // ...

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