A shape or set of values that includes or excludes portions of data.

learn more… | top users | synonyms (1)

-3
votes
0answers
16 views

What is layer stacking and masking out?

I'm very new to GIS. Can you tell me what is layer stacking and masking out means in ENVI software
4
votes
4answers
72 views

How to create a semi-transparent map collar in QGIS composer?

In QGIS 2.14, how can I create a semi-transparent "map collar" (white space around the outside of the page) in Composer? I imagine the map collar would be some sort of graphic shape (not a feature) ...
0
votes
0answers
12 views

kernel density estimation-mask layer-arcgis

I have a vector layer with points (road accidents) and another polygon layer which is the area in which occured these accidents. I ran kde where I changed the environments-raster analysis (I added as ...
1
vote
1answer
30 views

masking multiband with rasterio

I have 2 multiband rasters and I want to mask some areas of one of them with values of the other one, so I write this code (I can't figure out why is not working): import os, rasterio import numpy as ...
0
votes
0answers
7 views

Masking a sat. image pre-classification? ArcMap/ENVI

I need to classify the tree crowns in a .5m satellite image. To remove unwanted features in the classification (water, roads, buildings), I want to mask the image with an NDVI file first. I have the ...
1
vote
0answers
26 views

Geoserver Dynamic Raster Masking Based on Request Parameter

Is it possible for Geoserver to dynamically mask out values above or below a certain threshold in a WMS or WCS Geo-tiff request? For instance I make a request with some threshold parameter like 49 ...
0
votes
0answers
17 views

Land-Water mask for MODIS 0.05deg grid

I need to create a worldwide land-water mask for a series of MODIS LST/VI images (0.05 deg). I know that each MODIS hdf file contains a land-water mask. However, this mask changes between different ...
2
votes
0answers
37 views

Rasterizing Shapefile, using other shapefile as Mask

I have a shapefile (ShapeY) of European extend and want to rasterize each time only a certain area of the shape (ShapeX) (i have the shapes indicating the prevailing extend) with python and QGis. ...
2
votes
0answers
36 views

How to mask only select layers (i.e., exclude some layers from the mask)

is there a way to create a masking layer in QGIS (2.14) that will mask only certain layers, so that some layers (such as baselayer imagery or other) will be unaffected? I'm using geometry generator ...
4
votes
1answer
93 views

Altering elevation of specific cells in raster layer of QGIS?

I'm looking to alter the height of some cells within a raster and it's been suggested that I do this by creating a polygon layer and use that as a mask to alter only the heights of cells within the ...
3
votes
0answers
35 views

Mask out values in a raster based on standard deviation

Does anyone know (in Modelbuilder or python) how I can remove any values of a raster that outside of the range of three standard deviations? I have a lot of rasters so it would be quicker than ...
0
votes
3answers
105 views

Assign Mask From Layer in SearchCursor Loop In ArcPy: Error Accessing Environment

I'm trying to run a loop based on a SearchCursor that selects layers from an input polygon and polyline. I want to select a feature from the polygon to use as a mask for running Euclidean Allocation ...
3
votes
0answers
37 views

Open source alternative to the “Contours with Barriers” Tool in ArcGIS

I am trying to create a contour file for the globe for a project and am using open source GIS software packages. I was trained for several years on ArcGIS and there is a tool to create contours with ...
1
vote
0answers
63 views

Grass i.landsat.acca says image is cloud free but it is not

I'm working on an area in Amazonia with high cloud persistance which makes global data on land cover quite useless at small scales, so I wanted to learn to process my own Landsat images, with GRASS ...
2
votes
0answers
102 views

R Efficient Way to Resample, Crop, and Mask a Raster Image

Does anyone know an efficient way to resample an image? I am currently trying to crop a large image and clip 2 regions from a shape file. From this clipped image, I would like to increase the pixel ...
0
votes
1answer
39 views

Masking low quality raster with polygons in R gives weird overhang?

I am pretty new to R, and have been attempting to use the mask function on a raster image of 250mx250m resolution. My problem is that for some reason I am getting overhang, as there are pixels which ...
1
vote
0answers
42 views

How to create a numerical mask file with the elevation points of an area with QGIS

I'm using QGIS and I have to create a mask file (.txt) as an input for a hydrological model. The file should be a numerical grid map that represents the elevation points of a catchment area, like the ...
4
votes
1answer
148 views

Clipping raster file in ArcMap over the extent of polyline shape

I have a calculated raster file, overlayed on a shapefile with lines (like on figure) I would like to clip the raster in ArcMap (since it is an interpolation and out of the vector shape it is mostly ...
3
votes
1answer
152 views

How to ‘invert’ or ‘reverse’ a vector cutline when gdalwarp'ing a raster?

I have a raster of North America and I'd like to remove the larger lakes from it, replacing them with the same no-data value as the original raster. So I downloaded Natural Earth's 10 meter lakes ...
1
vote
1answer
82 views

Reclassify raster pixels underlying certain polygons using Python

I've got a shapefile with many polygons, each of which exactly overlays a contiguous region of raster cells; an example in yellow: For some of these, I want to use the polygon as a sort of analysis ...
1
vote
0answers
39 views

Mask Plugin and Atlas Composer Error

I have QGIS 2.8.1 and have downloaded the MASK plugin. I have a print template which I have created within the Atlas Composer and have this pointing to a boundary file. I want to be able to mask ...
1
vote
0answers
80 views

Creating polygons using mask layer?

I looked at this question, but it only answers part of my problem. I want to create Thiessen polygons based off of the green points within the blue polygon boundary ONLY. I've set the Processing ...
2
votes
1answer
99 views

Annotation masks disappearing

I have created annotation from the labels of a set of contour lines in ArcGIS and used Feature Outline Mask to create a mask layer in order to mask the lines using Advanced Drawing Options and make ...
1
vote
2answers
73 views

Combining several mask rasters to obtain one single mask with binary values

I have a series of separate rasters which represent the cloud cover over the same area but in different months. Each raster has 2 values: nan for "no cloud" and 255 for "cloud". What i want to do is ...
2
votes
1answer
78 views

QGIS Treat null as zero in raster calculator

In QGIS - I have an irregularly shaped raster - I wish to clip an irregular area out of it (call it raster A) with that area set to null. I masked the area (vector polygon) I want to remove and used ...
1
vote
1answer
56 views

Masking of DEM in ArcGIS Desktop?

I have a clipped DEM of my study area in ArcGIS Desktop 9.3 which I want to use for SWAT project set-up, but I need to mask it. How do I go about it? I'm new to the use of ArcGIS. I don't want to ...
0
votes
2answers
48 views

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 ...
2
votes
1answer
96 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 ...
1
vote
3answers
198 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 ...
0
votes
2answers
552 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 ...
1
vote
1answer
162 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 ...
0
votes
3answers
2k views

Deleting polygon defined area from raster layer in ArcGIS for 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 ...
1
vote
0answers
101 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. ...
1
vote
1answer
209 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-...
1
vote
0answers
108 views

Considering “holes” 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 ...
0
votes
0answers
57 views

Masking for subtype in ArcGIS for Desktop?

I have 1 polygon features which is vegetation.shp and 1 polyline features contour.shp. In vegetation.shp, it has 5 subtypes which is paddy, rubber, forest, oilpalm and sundry tree. How can i mask ...
0
votes
0answers
276 views

Failed to execute (ExtractByMask)

I use ExtractByMask of arcpy to isolate to subset the provinces of the Philippines. I do it with this code. import arcpy from arcpy import env from arcpy.sa import * arcpy.CheckOutExtension("Spatial")...
1
vote
0answers
129 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
votes
4answers
3k 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 ...
2
votes
1answer
83 views

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
1answer
155 views

Problems applying a mask in 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 ...
3
votes
1answer
527 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 ...
1
vote
1answer
185 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 ...
1
vote
1answer
237 views

TIN gets distorted when I use 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
vote
1answer
452 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 ...
2
votes
1answer
69 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?
2
votes
1answer
389 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 ...
0
votes
0answers
336 views

How to reassign the values of a raster, based on the pixels of the raster beneath it?

In ArcMap 10.2.1, I have two rasters. Raster1 shows the extent of a habitat, and each pixel contains a categorical value for its land cover type (values 1-3). Raster1 has the smaller spatial extent of ...
1
vote
2answers
208 views

Convert a mask image to polygon shape file 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 ...
2
votes
0answers
266 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 ...