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Questions tagged [noise]

May refer to ambient sound or random/uncorrelated patterns of samples in data, particularly raster data.

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Bad quality ground LiDAR cloud points

I got this point cloud using slam100 laser scanner, but seems to have an bad quality, someone said its all noisy, how could I fix that?
Gabriel's user avatar
1 vote
1 answer
615 views

How to find the standard deviation in GPS measurement of latitude and longitude?

Let's say my GPS configuration is said to have a precision of 10 meters. I have taken this as the standard deviation in the GPS measurements. But the measurements that come from GPS are latitude, ...
rohit kumar singh's user avatar
1 vote
0 answers
110 views

Smoothing a DEM with visible grid

I have a DEM (1x1m) whose hillshade shows like this: As you can see, a grid shows up and that could be a problem for hydrological modeling. Do you know why this happens? How can I remove this grid ...
Luca IERVOLINO's user avatar
3 votes
0 answers
180 views

How to remove noise from a DSM (city center) to create a 3D printable model

For the company I work for, I need to create a 3D printable model of a part of a city's downtown area. At my disposal (upon request to local government authorities) I have point clouds from LiDAR ...
Crisoberillo's user avatar
1 vote
0 answers
20 views

IDW interpolation with noise values in ModelBuilder in ArcMap [closed]

I'm using ModelBuilder to create a noise map using IDW. But in the attribute table I have two columns with different values: Lden is the average of the values ​​throughout the day and Ln is the night ...
Laura Ferreira Barbosa's user avatar
0 votes
1 answer
75 views

Raster data summarized in different vector polygons

I am using ArcGIS Pro 2.9.2 and I have a raster dataset of noise pollution across England with different noise levels. I also have the LSOA vector shp file. I want to get the average noise level per ...
GisScientistHearing's user avatar
3 votes
0 answers
170 views

Determine average noise in a shapefile using QGIS

I am completely new to QGIS. I am currently undertaking an analysis on urban green spaces (UGSs) in the city of Luxembourg. I have noise data (expressed in Lden (dB)) on car, rail and air traffic ...
Sam's user avatar
  • 31
1 vote
0 answers
88 views

Removing noise and detecting groups of rastercells that forms possible features in ArcMap

This is a raster image containing cells with values ranging from 0 to 10. You can see rastercells forming lines, which illustrates agricultural ditches, and more groups of red cells within the fields, ...
Lies's user avatar
  • 155
1 vote
0 answers
175 views

Receiver points appear as circle around building footprints in Openoise plugin for QGIS

I have been trying to get receiver points using Openoise plugin for QGIS 3.18 Zurich but they appear in a circle form around the actual building footprints.This is a Noise Modelling tool that helps to ...
Wombura Kimacha's user avatar
-1 votes
1 answer
251 views

Is it possible to host QGIS on a computing server?

I'm working on a project with QGIS Desktop 3.18.3. My plugin always crashes. Is it possible to host QGIS on a computing server? If so, will it improve the performance?
awkwardsquid122's user avatar
0 votes
0 answers
230 views

LiDAR XYZ Data Cleaning

I have tons of LiDAR Bathymetric XYZ data of 5m resolution. Data has a lot of noise/spikes which takes ages to clean for a small area. I have tried using Fledermaus for 3D cleaning the data. Is there ...
Santosh Gujar's user avatar
0 votes
1 answer
7k views

QGIS: exporting contours to DXF with height values

I am using this video tutorial to create ground contours for a noise model in iNoise. https://www.youtube.com/watch?v=JxCxBREEqG0 See tutorial 8 https://dgmrsoftware.com/products/inoise/gallery/ When ...
Scott's user avatar
  • 1
0 votes
0 answers
110 views

Spike and crater detection in DSM using machine learning / deep learning / computer vision techniques

I'd like to try machine learning / computer vision / deep learning approaches for detecting artifacts in Digital Surface Models, and am specifically interested in doing this for common artifacts like ...
Lakshay Sharma's user avatar
1 vote
0 answers
137 views

LiDAR data denoising algorithm complexity

I want to remove outliers (noise) from LiDAR data. Currently I'm using the same algorithm as LAStools: The LAStools software version 171215 implements a straightforward outlier removal ...
Kh4zit's user avatar
  • 111
1 vote
0 answers
113 views

Proper formula for computing signal-to-noise ratio of a camera?

I have a 5-band muultispectral camera, and I'm trying to find the signal-to-noise ratio (SNR) to supplement some research data I collected. Cameras with low SNRs generally have lower-quality images ...
ihb's user avatar
  • 493
3 votes
0 answers
710 views

Removing noise selectively from DEM using QGIS?

I am looking for a processing tool that can remove noise selectively from a DEM (Mostly SRTM). My current workflow includes "Fill sinks" and "r.neighbours". The problem is that the tool is blind to ...
Asaf Eliason's user avatar
2 votes
0 answers
144 views

Speckle on LiDAR data

Does LiDAR data suffer from the speckle noise like the SAR images and ultrasound cardiac images I'm used to? I think speckle noise is inherent to all active sensors, but I'm not sure for LiDAR ...
Hakim's user avatar
  • 956
7 votes
1 answer
640 views

Fixing spikes in DSM from LiDAR?

I have a DSM derived from drone LiDAR that I want to use as a base to drape imagery and, paired with a DTM, as a basis for estimating canopy height/volume. Unfortunately, the DSM has has many "spikes"...
Sherm's user avatar
  • 71
12 votes
8 answers
12k views

Editing LiDAR point cloud to remove noise/outliers present below and above ground?

I have "dirty" LiDAR data containing first and last returns and also inevitably errors under and over the surface level. (screenshot) I have SAGA, QGIS, ESRI and FME at hand, but no real method. What ...
Robert Buckley's user avatar
3 votes
1 answer
299 views

Slope raster seems to come out distorted?

I've been trying to get a slope raster from a DEM, so I can reclassify it and aggregate it with land use data. The problem is that my slope raster seems to have a lot of distortion (diagonal lines). ...
Guilherme Salles's user avatar
1 vote
1 answer
198 views

Cleaning up polygon generated from NDVI raster

So I have NDVI raster files for about 1000 acres of vineyards we manage. What I have done is created a model that takes the NDVi raster, reclassifies it to isolate out the areas of high vigor, then ...
RPeriana's user avatar
2 votes
1 answer
127 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 ...
Rachel Jade's user avatar
4 votes
2 answers
2k views

How to create a sound map using ArcGIS?

I have locations of the points which produce sound. I want to create a sound map based of those points, topography, and the distance at which a sound can travel. On this picture you can see the red ...
Liza's user avatar
  • 287
1 vote
0 answers
36 views

Eliminate noise when using spatial join with tolerance

I have two networks, which doesn't align perfectly with each other, so when I want to attach attributes from one to another, I have to use spatial join with a certain amount of tolerance. However, at ...
Tianxin Li's user avatar
13 votes
6 answers
12k views

Detecting and fixing outliers in a GPS trajectory

I need to find an algorithm or method that can detect outlier latitude longitude points in a trajectory during post-processing, which can then be fixed (brought back into the trajectory's path based ...
J.P.'s user avatar
  • 175
4 votes
2 answers
3k views

A method for noise reduction in GPS derived cycling routes

I'm pre-processing GPS data to assess possible methods for a planned research. The aim of the research is to use crowd-sourced cycling routes data to plan a cycling paths in an Israeli city. ...
dof1985's user avatar
  • 3,146
1 vote
0 answers
145 views

Managing or Reducing noise in a mosaic raster

I have created a raster with the Mosaic to New Raster tool from 3 separate rasters. However in my mosaic I have some consecutive pixels which seem to be the noise of the previous procedure. Is there ...
Konstantin's user avatar
1 vote
0 answers
111 views

Is it right to remove salt & pepper effect from a product produced by clean images?

I have two images from classification (different years) and I want to find the changes of land cover . I have cleaned the two images (salt and pepper). When I create a cross product of the category ...
geo_dd's user avatar
  • 604
3 votes
3 answers
315 views

Computing population exposure

I am new to ArcMap. I have polygon layer, which represents buildings, and each polygon has number of inhabitants in Attribute table. Then, i have a layer which shows noise levels in the area, ...
Jano's user avatar
  • 31
1 vote
2 answers
15k views

Using raster to clip vector data

I have high res raster data covering 2million km sq, with a field where each cell has a value from 0 to 100. I need to create a "mask" using the cells with a value over 12 in that field. I then need ...
RFwisher's user avatar
  • 173
1 vote
2 answers
586 views

How to find a route given a set of noisy points

First of all, I'm a total noob to GIS problems. Let's say I have a set of noisy GPS points (tracked while driving) along a number of streets. Is there a way to get the most likely route that generated ...
Christian's user avatar
  • 121
1 vote
3 answers
3k views

Which interpolation method for noise mapping?

I want to create a noise map with measured point data. But I want to have a planar representation, so I need an interpolation method. Which one is the 'best' for measured noise data? I prefer 'IDW'...
user28840's user avatar
6 votes
5 answers
9k views

Fixing Landsat 7 SLC-off in ENVI

I have a couple of Landsat 7 images and they all have striping as a result of the SLC failure. Does anyone have any suggestions as to how to destripe the image using ENVI? I plan to use these images ...
interactivemaps's user avatar
5 votes
1 answer
4k views

How to perform Noise Pollution Mapping using ArcGIS for Desktop?

I've been trying to do a noise pollution map, and I really don't know where to start with the information I have. The end result needs to be like in the link below. I've seen the question, Creating ...
Gunnar's user avatar
  • 95
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 ...
Kasper's user avatar
  • 307
9 votes
2 answers
13k views

Creating noise maps using ArcGIS for Desktop or Open Source Desktop GIS? [closed]

In a previous role I helped create Noise Maps for Northern England. The predicted noise levels was done using the IMMI package (which I can recommend) and the cartographic output was done in ArcMap. ...
jakc's user avatar
  • 9,858
1 vote
1 answer
1k views

Why is the imported TIFF file distorted with noise in Quantum-GIS?

I've a TIFF-file. Loading the raster image into QGIS does not display correctly. (Using the Add raster layer button.) It seems to be distorted with noise. See image below: The source of the TIFF file ...
q9f's user avatar
  • 2,176
5 votes
1 answer
2k views

Disabling sounds/beeps in QGIS

Is there any way to disable, mute, or otherwise change the incessant message 'beep' in QGIS? I need volume on the PC for other unrelated notifications.
mastorey's user avatar
  • 449
2 votes
3 answers
282 views

Terrain Beautification

The satellite imagery i am rendering is not realistic does not look good. So i was planning to improve things through code(like adding noise to data or using different overlay texture for different ...
user8119's user avatar
  • 337
6 votes
2 answers
2k views

Adding noise to a raster

I want to add some fine-grained noise to a raster in an automated python process (i.e. I do not want to use Photoshop or GIMP). I looked at PIL, but unless I'm mistaken, it doesn't seem to have any ...
MappaGnosis's user avatar
  • 33.9k