Questions tagged [masking]
Covering or hiding features on a map.
355
questions
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votes
2
answers
89
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How many percentage of sea area is covered with points?
I have a large number of lat/long positions at sea for a geographical area (stored as CSV). This geographical area also contains lots of land area. I want to divide the sea area into a grid (f.ex down ...
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3
votes
1
answer
265
views
Landsat Surface Reflectancce product Python packages
I have to work with numerous Landsat surface reflectance product that I downloaded from http://landsat.usgs.gov/CDR_LSR.php. The product comes with a QA data with information on clouds and shadows ...
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1
vote
3
answers
515
views
Clipping several raster datasets with mask?
I would like to clip many images (raster datasets, input) with a mask (shapefile) for my study area. Is it possible to do with ArcGIS 10.3 for Desktop?
I tried to merge all the images but it is ...
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0
votes
2
answers
6k
views
Reversing Extract by Mask in ArcGIS for Desktop? [duplicate]
I have a DEM and I want to apply some tools to it (fill and others). In my DEM I've zones (drawn as mask) that need to be exlcluded from that processing.
I don't want to apply the processing to the ...
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1
vote
1
answer
564
views
How to create a feature mask with a polygon? [closed]
I need to create the SAME polygon shape shown in the image below, just 2 miles larger. The buffer wizard tool is only creating circular buffers around the irregular shape below. Any ideas on how to ...
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6
votes
6
answers
26k
views
Deleting polygon defined area from raster layer in ArcGIS Desktop?
Which tool do I use in ArcGIS 10.1 for Desktop to exclude areas covered by vector polygon layers from a raster layer?
I want to keep portions of the raster layers that exclude the portions covered ...
- 61
1
vote
0
answers
237
views
Masking in ArcMap
I have question on masking.
I have vegetation group layer.
Under vegetation group layer, there are 3 layer which are V_Vegetation_Miscellaneous_A, V_Vegetation_Agriculture_A, V_Vegetation_Forest_A.
...
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2
votes
1
answer
1k
views
Issues with extract by mask tool
I am using the extract by mask tool to fit my raster to a mask (province of Nova Scotia). I've noticed that the raster doesn't quite fit the mask; the north and south boundaries of the province is cut-...
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12
votes
3
answers
2k
views
Considering holes/constraints in Voronoi polygon creation in QGIS?
I am trying to create voronoi polygons in QGIS that would consider "holes" in the general domain. An example would be:
I actually created the Voronois in this image using QGIS through the GRASS ...
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1
vote
0
answers
366
views
Mask plugin, Atlas composer and Legend
I'm tryin' to use the mask plugin associated with atlas composer (QGIS 2.7 dev).
I'd like to have in the legend of map composer only the features that belong to mask instance (inside the mask).
if I ...
- 11
39
votes
6
answers
28k
views
Increasing speed of crop, mask, & extract raster by many polygons in R?
I'm extracting the area and percent cover of different land use types from a raster based on several thousand polygon boundaries. I've found that the extract function works much faster if I iterate ...
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2
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1
answer
228
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remove unwanted areas which are not inside the boundary of second raster
1 raster layer - global map ;
2 raster layer - berlin
I cropped out 1 layer using extent of 2 layer and then overlapped these two layers however I see that 1 layer still has areas apart from berlin(...
0
votes
1
answer
1k
views
Applying mask in ArcGIS Geostatistical IDW?
I'm finishing an analysis of approximately 850 archaeological assemblages in the Mediterranean, and I've successfully run IDW in Geostatistical toolbox (ArcGIS 10) to generate the results I like. I'm ...
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3
votes
1
answer
2k
views
Extracting raster data outside of clip
I'm trying to extract Sea Surface Temp raster (floating integer) that includes both sea temp and land surface temp. I want the data outside of a clip. I've clipped the coastline with a polygon in ...
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1
vote
1
answer
613
views
IDW with QGIS from a vector points file within a mask
Given two inputs:
A shapefile: points
A raster: mask
I want to interpolate the points within the extent of the raster except the NoData pixels that i want to use as a mask. NoData pixels are the ...
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1
vote
1
answer
667
views
TIN gets distorted using hard clip to edit it?
I have two cross sections from which I have created a TIN as can be seen in the following image. For removing the extra outer portion of the TIN, I created a polygon from the cross-sections and edited ...
- 1,320
1
vote
4
answers
6k
views
Error: Cutline feature without a geometry. > Raster Type
I've got an Error: Cutline feature without a geometry on QGIS 2.4.0 Chugiak.
I have 2 samples (A raster type and a vector type), they have the same coordinates (EPSG:4253 - Luzon 1911) Then I tried ...
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2
votes
1
answer
216
views
QGIS vector layers do not match DEM?
I have a DEM (saved as a .tif) and, using QGIS, I want to clip the DEM using a vector mask.
The function will not work.
Am I missing critical step?
- 29
3
votes
1
answer
2k
views
Preserve attribute table while using Extract by Mask in ArcGIS
When using the Extract by Mask function on a raster with several columns (beyond value and count) in the attribute table, the resulting raster does not have all the columns (it only has value and ...
- 81
1
vote
2
answers
658
views
Convert a mask image to polygon shapefile using GRASS
I used image classification technique in GRASS GIS v7 and generated the image mask below in which white area has NULL value and red area contains 1.
I am going to clip those red color areas in a ...
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2
votes
0
answers
492
views
Ecoregions shapefiles: subsetting, extracting and summarizing data from raster
I am attempting to subset and project an ecoregions shapefile from : EPA ECOREGIONS
my data set is found here: SHAPEFILES and RASTER
When I run this code, two major problems occur: 1) I cannot get the ...
- 757
4
votes
2
answers
2k
views
Masking WMS (Esri Oceans Basemap) layer in ArcGIS for Desktop?
I would like to display ESRI's Oceans basemap web map service (WMS) in one of my maps, but not the whole layer, just the landmass depicting Canada as I find it a nice fit for the look I'm trying to ...
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14
votes
1
answer
17k
views
Is Clip (Data management) or Extract By Mask (Spatial Analyst) more efficient?
I'm trying to clip down an Orthophoto to a county boundary. I've been using the Extract By Mask Tool, but this process has been running for about 12 hours! It's gone through 2 cycles already, so I'm ...
- 441
2
votes
2
answers
3k
views
building a water mask
I'm working with multi-temporal datasets from modis and had to do various vegetation indices. I ran into a problem now because there is a significant amount of water too, which skews the resulting map....
1
vote
2
answers
2k
views
How do I restrict a fme transformer to work only within a polygon mask?
I would like to define the area in which a transformer should be applied by using a polygon mask. I know this can be done in FME but I can´t find any references to it. Can anyone enlighten me?
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14
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4
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30k
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Clipping raster layer with *raster* mask layer in QGIS
Given two input layers
The clip layer - an arbitrary layer (though in my case it's a float 1 band geotiff)
The mask layer - a paletted raster in which every pixel is either NO DATA or a single "...
- 5,871
4
votes
2
answers
2k
views
Detecting cloud shadows
I am trying to detect cloud shadows in Landsat images.
I came up with producing good shadows and cloud masks. Now I'd like to implement my cloud mask adding cloud shadows.
Do You have a good idea to ...
- 3,697
6
votes
3
answers
8k
views
Changing raster cell values within polygon using QGIS GUI
How do I change the values of raster cells which are within a polygon, leaving all cell values outside the polygon unchanged?
I would like to subtract 1.5m from each raster cell value within the ...
- 438
5
votes
1
answer
194
views
Cutting Raster using two Polygons as Masks
I am trying to cut this raster in order to drop the outside of the walls white area and the area with the dots.
I made one step using as mask the green polygon but i couldn't remove the inside of the ...
- 193
2
votes
1
answer
1k
views
Raster topo map "collars" overlapping?
I am using QGIS 2.0. I have downloaded USGS 1:100,000 topographic maps which show adjacent areas. The topographic maps were digitized with the borders (I've seen them called "collars", I think) as ...
- 1,076
7
votes
2
answers
9k
views
combine raster with another raster mask file - gdal
I have 2 rasters in GeoTiff format. One has all of the land and water and the other is a mask file that shows either 0 for water or 1 for land. I basically want my output to just have the land values ...
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4
votes
2
answers
3k
views
Extracting raster data to multiple polygons using ArcGIS Desktop?
I have a reclassified raster dataset (10 classes) and I want to find out the area of each class contained within multiple (hundreds-to-thousands) polygons.
I have all the polygons in the same ...
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4
votes
2
answers
10k
views
Determine if point is within an irregular polygon using Python
I would like to create a mask of a grid where points are evaluated as either 1's or 0's depending on if they lay outside of an irregular (i.e. not rectangular) polygon.
I have a set of high-latitude ...
- 433
3
votes
1
answer
275
views
Create a band mask based on pixel locations, not in pixel values
I have this image loaded in QGIS, with two possible values for the pixels: 1 = orange, 2 = blue
For simplification, assume it represents a province of a country.
I want to extract just the part of ...
- 1,731
2
votes
0
answers
285
views
how to make decent sense from scattered river depth measurements
I sampled river depth at scattered positions and I want to be able to make a map and GIS layers out of it.
My problems are:
As the river meanders the interpolation I do in scientific packages i,e. ...
- 562
3
votes
3
answers
3k
views
How to crop an image based on a shapefile using GeoTools
I'm writing a web application using GeoTools (it's Java running in a web container). I need to crop a raster file based on a shape file. The core GeoTools documentation and examples I can follow ...
- 161
1
vote
1
answer
1k
views
Restricting Tin interpolation in QGIS
I am trying to do a bathymetric map for a lake using QGIS. However, I see no option to impose a mask so interpolation does not extending beyond the boundaries of my lake. I have traced around the ...
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5
votes
1
answer
5k
views
How to reclassify raster inside polygon mask, leaving values outside as they are?
I am in the final stages of a landcover classification and need to reclassify thematic raster values that are inside different polygon masks, while leaving the values outside as they are.
Can I do ...
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1
vote
1
answer
632
views
Maps with Clipping on ArcGIS Server
We are publishing raster layers (computed via kriging) to ArcGIS server 10.1. A significant feature of our local geography is a large body of water, in our case, Lake Michigan.
Although I can clip ...
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3
votes
1
answer
1k
views
Masking/removing polygons from shapefile
I have a shapefile containing the road traffic noise of a city.
The shapefile has 5 columns, where 'noise_in' (noise interval) ranging from 1-5 is included.
I want to remove/mask the road noise from ...
- 307
3
votes
1
answer
3k
views
How to invert polygons (or other options for exterior styling)?
I have a shapefile containing many polygons that I want to use to mask a raster. I have tried gdalwarp -cutline <shapefile> -crop_to_cutline -srcnodata -9999 -dstnodata -9999 <source_raster&...
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1
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2
answers
3k
views
How to mask out features outside of the Coverage Layer for Atlas plugin? [duplicate]
Using the Atlas plugin for qGIS how do I set the coverage so that it will only highlight the feature(s) I want but still show the surrounding features as grayed out areas?
This would have been easy ...
- 499
2
votes
2
answers
369
views
How do I calculate acreage grouped by owner, masked by a poly?
I have statewide land ownership data and have created a mask to project ownership for only one county. I need to calculate the acreage of each owner within that county. Is there a quick way to ...
- 21
5
votes
1
answer
1k
views
Modifying raster pixel inside polygon using GDAL [closed]
I would like to set to novalue all the pixels of my raster inside a polygon.
I'm trying the gdalwarp command line with -cutline option.
But this command extract the values of my raster inside the ...
- 871
14
votes
4
answers
13k
views
Using polygons to apply unique value to all raster cells within those polygons?
In ArcGIS 9.3, I have a raster file that I would like to "mask" with polygons, giving a single value to all the raster cells that overlap the polygons.
How can I do this?
Here's a screen shot, ...
- 397
4
votes
1
answer
1k
views
Looping mask in ArcPy
I am working with raster data on a worldwide level with a resolution of 30 arc seconds.
I need to export the data into a table format but given the high resolution you cannot run the "Sample"...
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0
votes
1
answer
3k
views
Clipping Rasters with a mask layer error
I've got a NDVI layer that I'm trying to clip with a vector file but when I try and use GDAL Tools clipper I get an error. That shows up like this:
What am I doing wrong? This is before I even pick ...
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6
votes
1
answer
10k
views
How to create mask bands in GDAL and Python?
I have small program in Python that uses gdal and numpy to perform a logarithmic scale of some data into the RGB 0-255 range.
Now this input data has a nodata value set to mask the valid values, and ...
- 443
8
votes
1
answer
977
views
Reduce extent of raster processing in ArcPy or ArcGIS Desktop?
I need to reduce the processing extent of my raster by some sort of automatic procedure in python. Currently the borders of the dataset I've been using has anomalies (due to the classification of the ...
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3
votes
1
answer
2k
views
How to hide some parts of an image layer with OpenLayers?
My Problem
I'm currently displaying a layer image above a Google Maps base layer. I would like, when the user check/uncheck some checkboxes, that some parts of this image layer disappear, and the ...
- 325