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Questions tagged [distortion]

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How to check the distortion of an image that has been taken from a drone in order to georeference it?

Is it possible to check if my video, taken from a dji phantom 4 advanced has the fisheye effect? I want to georeference multiple same frames, so i wonder if i have to correct the distortions first. ...
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42 views

ArcMap QGIS different distortion

I have a problem with a shapefile (EPSG:31287 MGI_Austria_Lambert). I tried to solve it on my own, but I just have no clue as to what's the error. So I use a basemap from basemap.at (WMTS: https://...
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1answer
66 views

QGIS distorted contour from DEM

The contour map that I generate from a Maps Made Easy (MME) DEM produces a distorted result and I’d like to learn how to correct the problem. Shown is a pool that has been physically measured to be ...
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1answer
62 views

Creating time-space map by distorting city-points polygons using QGIS?

I've already 3 main layers on shp in qgis: the points of some places, the cities polygons and a grid of 10km, as you can see on the image. I would like to distort the map using time values to modify ...
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How can I project a raster DEM and not get serious distortion in the resulting DEM?

Please see this link to see a fine example of what I am dealing with. Distortion in projected raster My specific situation is that I have downloaded DEM data from the National Map (USA) and it comes ...
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1answer
100 views

Distance in SRTM image vs. Google Earth/etc

I am producing DEMs and various maps for own book project; just learned to use GIS software for this project. I am using QGIS (2.14.21) and SRTM data (CRS:WGS84 EPSG:4326). I want square maps that ...
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1answer
980 views

Clipping vector layers with different CRS

I have two vector layers: provinces (Belge_Lambert_1972, EPSG:103300) - clip layer building (WGS 84/ Pseudo Mercator, EPSG:3857) - input layer I would like to overlay them, however there is ...
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1answer
143 views

Distorted image of KML in QGIS

I just started using QGIS and I used Google Earth to export images as KML ground overlays. I then bring the KML into QGIS, then georeference the raster. I tried using de CRS 6370. However, the image ...
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1answer
115 views

Resampling WGS84 to ETRS89 causes change in pixel dimension

I'm a first time QGis user and got some resolution troubles. I need to create a DEM for whole Europe using SRTM 1-arc second (30m) from USGS. As I need the slope algorithm in a later step, I have to ...
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2answers
89 views

True non-projected 3D grid world modeling

I did a search on this but I did not find anything much relevant yet. I was wondering how come there is no GIS software that would take a sufficiently accurate 3D surface model of the world (such as ...
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1answer
447 views

Fix distortions when reprojecting cshapes world maps?

I am using the cshapes package in R as a source of historically accurate country borders. While the default WGS 84 maps plot fine, I would like to reproject the maps. This introduces some distortions ...
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178 views

How to calculate zonal statistics of buffer zone with minimum distortion

I want to create 50km buffers around a large set of polylines that have a global extent. My objective is to calculate average raster values within each buffer zone. The matter of confusion: I want ...
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1answer
248 views

After how much distance does the x,y coordinate system become noticeably distorted?

I'm working with maritime sensors that give information of moving objects it detects, in azimuth, range and elevation, and we convert it to x,y coordinates for our application to be able to process it....
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0answers
1k views

Evaluating map projection scale error

This is related to a previous question How to determine projection parameters when customizing a projection I posted. I am trying to quantitatively evaluate scale distortion associated with choosing ...