Stack Exchange Network

Stack Exchange network consists of 174 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange
Make your voice heard. Take the 2019 Developer Survey now

Questions tagged [smoothing]

smoothing is a generalization process that removes any extreme values in a line string or surface

0
votes
0answers
13 views

PAEK smoothing tolerance

How should one determine what the Polynomial Approximation with Exponential Kernel smoothing tolerance should be when smoothing a shape file using the Smooth polygon tool
2
votes
1answer
110 views

Data smoothing of Sentinel-2 NDVI time series chart in Google Earth Engine?

I am exploring Sentinel-2 time-series NDVI with Google Earth Engine. In another post I learned how to plot a NDVI time series chart. I know that there are many smoothing methods for reducing NDVI ...
3
votes
3answers
67 views

Smoothing raster with binary cell values

Main question towards the end. Details follow now: I have a slope raster Region: Bern, Switzerland CRS: EPSG:2056 - CH1903+ / LV95 - Projected Extent: 2587757,...
0
votes
0answers
21 views

Process to smoothing curves and lines of Centerline Layer?

I am looking for a workflow to improve the visual appearance of a municipal centerline shapefile that I will be using for some mapping outputs. It is a standard line segment vector layer. I have ...
1
vote
1answer
18 views

Mapnik upsampled raster isn't smooth

I'm using Mapnik to show a map with hillshading. It works well when displaying it up to my tiff's native resolution and a little bit above, for instance at zoom 13 (dataset is SRTM30): But then if I ...
2
votes
0answers
42 views

World DEM speckled outcome solution

I have a world digital elevation model which has been classified into 5 showing the different heights. My issue is that viewing and printing this image as it is results in a speckled look due to the ...
1
vote
1answer
64 views

Generalizing slope raster in Mapinfo?

I am working on calculating a slope raster in Mapinfo using a 15cm DEM derived from a LiDAR point cloud and the output data will have 3 predefined breaks displayed so I need to blur those relatively ...
1
vote
0answers
44 views

Importing .geotiffs and wavelet denoise plug-in - GIMP

I am trying to run the wavelet denoise plug-in tool on GIMP to smooth a .geotiff. Unfortunately when I import the .tiff, the spatial refernece is lost and the image appears black. My goal was to ...
1
vote
0answers
32 views

Obtaining a smoothed DTM?

I am use AcGIS 10.1 and have a DTM with an 8 m grid resolution. Which tool could I apply to smooth the surface?
1
vote
0answers
24 views

Smooth Data Values Across Geographies with Zero Population

Looking to fill in gaps through generalizing a population count across U.S. counties. I.e., if a county has 0 population, but is surrounded by 5 non-zero counties, then change the 0-population county ...
1
vote
1answer
43 views

Remove small interstices on the edges of a polygone

How can I remove the white interstices on the edges (and interior) of a polygone or polyline, as represented in the first figure below? I want to get smooth and continuous edges, capturing the global ...
2
votes
0answers
84 views

Optimized smoothing of stream lines generated from Arc Hydro? [closed]

Has anyone found an effective ArcGIS 10.3.1 workflow for smoothing streamlines generated from ArcHydro...or hydrology in general? (Fill -> Flow Dir. -> Flow Acc. -> Stream Def. -> Stream Seg.-> ...
2
votes
0answers
170 views

Smoothing borders of polygons taking a layer of points into account

I'm trying to smooth borders that separate clusters of points. GRASS instrument v.generalize.smooth works pretty well, except that in some cases the points end up on the wrong side of the smoothed ...
1
vote
0answers
53 views

Avoiding tiling/mosaicing in resulting image when Pan-sharpening Gram-Schmidt?

I mastered to georeference some declassified Hexagon satellite imagery from the 60s and would like to use it to pan sharpen a current Sentinel satellite image (already done as RGB). It is very ...
3
votes
0answers
91 views

Why do I get invalid elements (polygons), when smoothing a vector layer (smooth geometry)?

The problem occurs, when using the commands "Smooth geometry" or "v.generalize.smooth" in QGIS. The shapefile, which I want to smooth, shows a flood water level and looks like this: The water level ...
4
votes
1answer
2k views

QGIS Raster map, smoothing pixels

I am trying to generate a map in Qgis which makes it possible to see the temperature of a region during a heatwave. This was a great succes. However, I want to add shades as well, since shades lower ...
0
votes
0answers
170 views

GRASS r.denoise error

I have installed r.denoise, put mdenoise into QGIS2.18/bin and installed "pip install pyproj". However when I try to run r.denoise on STRM DEM, a get this error: ERROR: Unable to open file <...
1
vote
1answer
556 views

Continuous smoothing of raster using R?

I have a dataset on some villages like this on a grid: I want to fill the space of the whole grid so that each grid cell has a value that reflects the pressure from the surrounding villages (i.e., ...
4
votes
1answer
354 views

Snap existing line vertexes to nearest line in MapInfo

I have driven along some roads and registered some information about the state of the edge of the road. The GPS coordinates are not very precise, and I would like to smooth or snap the tracked lines ...
2
votes
0answers
46 views

Smoothing out polygons without gaps? [duplicate]

I'm converting a raster data to vector data. The problem is similar to this: How to smooth large vector polygons from Raster But what I need to know is how can I handle out the gaps that are formed ...
3
votes
0answers
451 views

Leaflet: Smooth lines between points without control points?

Goal I want to connect points using a polycurve or curved lines in Leaflet in a scalable way. If possible, without defining control points. Approach I'm using the Leaflet.curve plugin which offers ...
4
votes
1answer
149 views

Methods behind qgis:simplifygeometries and qgis:smoothgeometry?

I would like to know on which method (e.g. Douglas-Peucker line simplification) the modules qgis:simplifygeometries and qgis:smoothgeometry are built on. I cannot find further information on these ...
1
vote
0answers
39 views

Rule of Thumb for setting smoothing parameter

I'm trying to model some binary data (disease infections) using indicator kriging in the Geostatistical Wizard in Arc 10.3. For presentation purposes I'm using the smoothing option. Is there a rule of ...
1
vote
1answer
214 views

Raster data like heatmap from polygons w.r.t their own values

I have polygons as below, and each polygon is assigned to some value. What I'd like to do are ... Smoothen boundaries (Values should change more smoothly around boundaries) Fill N/A part properly ...
2
votes
1answer
547 views

SAGA Gaussian filter lower value than 1?

I'm smoothing a 2 meter DEM using the Gaussian filter in SAGA through QGIS/Processing and the smallest amount for the smoothing of the Standard Deviation value of 1 which for me is too much, it all ...
1
vote
0answers
131 views

Smoothing relatively flat DEM for terrain and hydrologic analysis

I'm trying to do some terrain and hydrologic analysis from a 1/3 arcsecond DEM that I downloaded from the USGS National Map website. The issue I'm having is that the area in question is central ...
3
votes
1answer
70 views

Gap filling for linear features using ArcGIS Desktop?

I have a Landsat time series from which I derived NBR using bands 4 and 7, and delta NBR (to show changes). I then set a threshold based on the mean and standard deviation delta NBR values to ...
1
vote
1answer
679 views

Looking for a tool to smooth edges of raster areas in QGIS

I am looking for a tool which helps me to smooth primarily edges/outgrowths of raster areas/zones in QGIS/GRASS/SAGA. I particular, regarding the image below, I would like to reduce the single lines (...
2
votes
0answers
169 views

gdal_grid invdistnn with smoothing?

I am trying to generate a raster with many pixels (10240x10240) using the gdal_grid tool but I have problems choosing the right interpolation algorithm. I have a dataset with varying point density (...
1
vote
1answer
502 views

Smooth linestring shapefile

Is there an algorithm to perform a smoothing of a linestring and maintain the original points?
1
vote
0answers
327 views

Smoothing GPS data? [closed]

I am working with a GPS track that is 7 days, and shows me trips by travel mode. Occasionally a "stationary" point will pop up amongst a set of "vehicle" points, I want to smooth this data to delete ...
1
vote
0answers
34 views

Resampling raster based on more than 16 nearest cells?

I have a habitat suitability map, with cells of 30x30, each with a score of relative suitability for fox. The problem is that, with 30x30 cells, the grain is too fine for getting a broad sense of what ...
0
votes
0answers
75 views

Smooth errant points on DEM Curve

I have been working with SRTM data to add height to road line strings and am getting results that look as follows:- This has been achieved by using a weighted average of SRTM elevation values along ...
0
votes
2answers
226 views

Smooth parts of adjacent polygons

I have got a set of layers, for example, villages, districts and towns. Their borders are the same on edges of town layer and need to be smooth. I used to perform it manually using topology edit tool. ...
5
votes
1answer
3k views

Smoothing of a DEM

I have a DEM which has some individual pixels lower than those around them. This is a problem as I am using the DEM for pluvial flood modelling and therefore it is providing an incorrect ...
1
vote
1answer
922 views

Raster time series smoothing package using R

Does somebody knows if exist a package in R specifically for raster time series smoothing? I´m using aproachs like this one (using the equation suggested by Hamunyella et al., 2013) for (i in 2:(...
1
vote
0answers
172 views

How to smooth “internal” polygon borders [closed]

This is my first foray into GIS and GIS software. I am using ArcMap currently. I have a shapefile of the world divided into different ecological regions. I would like to reduce the file size by ...
1
vote
1answer
116 views

Can I statistically smooth attributes spatially (using distance/surrounding polygons) in ArcGIS?

I have Census Areas with some of the Census attributes. Is it possible to take an attribute, for example, percentage of people in full time employment, and derive a spatially smoothed version of the ...
1
vote
1answer
518 views

smoothing raster layer stack using R

I'm trying to do smoothing for .tif stack layer of 331 bands. I used this code in R : setwd("D:\\") raster_dir <- "D:\\Modis VI quality\\" VI <- brick(paste(raster_dir,"...
0
votes
1answer
51 views

filter a raster stack in Arcgis

i'm trying to run "Filter" operation using AcGIS on a stack layer of 331 bands. However, the result is always a raster of only one band. How can i get operation to be done on the whole stack?
0
votes
0answers
93 views

Smooth raster stack

How can I smooth a raster stack of 300 bands using R/Arcgis/Envi? I used this code: setwd("D:\\") raster_dir <- "D:\\Modis VI quality\\" x <- brick(paste(raster_dir, "laikipia_VI_quality....
6
votes
3answers
713 views

Smoothing method for big polygons

I'm looking for an alternative to 'snakes method' for smoothing very big polygons, which I created from SRTM elevation datasets. The problem is that the smoothing is getting stuck after a while with ...
0
votes
1answer
47 views

Add a random value of the order of 10^-2 to raster layer?

I was doing some raster analysis for smoothing in ArcGIS, one of my task is adding a random value of the order of 10^-2 to a raster layer. Does anybody know how to do it?
2
votes
1answer
581 views

Using Chaiken Method parameters for smoothing polygon vectors in QGIS [duplicate]

I've been trying to smooth a huge polygon, that is result of a segmentation export. I'd like to know what's the best parameters to use Chaiken Method to get smooth curved boundaries on QGIS 2.14. I ...
1
vote
0answers
41 views

Zonal smoothing on a specified area of a raster?

Is there any way to smooth a specify an area on a raster, such as a DEM, and smooth it? For example, I'd like to smooth out the artifact highlighted in the red box. What is the best course of ...
9
votes
2answers
871 views

How to smooth adjacent polygons?

I want to smooth polygons which share a common boundary. How can I smooth them so that the shared boundaries stay shared? I'm using Arcgis 10.3
1
vote
0answers
79 views

How to remove white stripes in TIN generated in Arcgis?

I've generated TIN from DEM data using toolbox (3Danalyst/conversion/from raster/raster to tin) in arc-desktop 10.2. I'm getting these stripes, I tried altering toolbox parameter values but couldn't ...
10
votes
2answers
346 views

Make several rasters more uniform

I have imported some rasters that is supposed to be continuously connected but instead they create some sort of bordered grid between them. I may assume that this is a matter of calibration between ...
4
votes
1answer
2k views

How to smooth NDVI raster (Sentinel 2-A image) in ArcGis?

My question is regarding the final display of a NDVI raster. I currently work with ArcGIS Desktop 10.2.2. When I work with Landsat images (the image is loaded as composition through the MTL file, ...
4
votes
1answer
614 views

Polygon inner rings/holes issue

I am working on a script to smooth polygons. Essentially it, separates the inner and outer rings/polygons and send the coordinates to a smoothing def/function. The "smoothed" coordinates are then ...