Questions tagged [interpolation]

The estimation of values at unsampled points based on known values of surrounding points.

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562 views

How to interpolate within defined boundaries of a deformed mesh using R?

My goal is to create an interpolation map of some output model results that are mapped on a deformed mesh (from a numerical simulation). The model results are in an x-y plane (representing coordinates)...
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909 views

Difficulty using ordinary kriging in QGIS 3

I have a shapefile with 65 data points. Each data point has a value for NO2 pollution. I would like to use kriging to create a grid of NO2 pollution values for the whole area. I have tried using ...
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448 views

Calculate lat/long as percentage distance between two points (MSSQL)

I've loaded the US road shapes into MSSQL. I've determined the query to locate the segment of road for a specific address. The segment contains a "linestring" from a series of points. I'm trying to ...
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328 views

Wind Time series in QGIS?

I have 11 time series wich include the values wind direction, wind speed and wind power. What I want to do is an interpolation between each value. Each time series contains 8670 values for every hour ...
3
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280 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 (...
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245 views

Regridding vector values

I'm trying to regrid and interpolate vector values from WAM model output. I got WAM model netCDF output in rotated grid, I need to interpolate it to another grid which is some variant of LAEA ...
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404 views

Creating a DTM from Contours, via the command line or Python

I am looking to create a gridded DTM/DEM (Digital Terrain/Elevation Model) or TIN (Triangulated Irregular Network) from a set of contours. There are a number of similar questions on both this site ...
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280 views

3D interpolating

Our final year project domain is soil contamination modeling. We collected soil samples at the depths of 0.3 cm ,0.5cm , 1cm , 1.5 cm in about 25 locations. We considered 8 contaminants- p h, sodium, ...
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700 views

How to include 3D break lines in QGIS raster interpolation

I wish to add a break line to an interpolation of a set of survey points to simulate an elevated ridge in the survey area. Using QGIS 2.6 on Windows 7. I have created a polyline shapefile with a ...
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99 views

Elevation interpolation along a (sewer) line

Here's what I want to do. I have a vector sewer line feature class that contaings a field for the high invert elevation and one for the low invert elevation. I can turn them into a raster no problem ...
3
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474 views

How to Interpolate very large datasets in QGIS?

I am working with a very large set of point data, (XYAttribute) which I wish to display as a raster. I've been using Interpolate, this is successful but very slow. I have other programmes that ...
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6k views

Smoothing results from scipy griddata interpolatioin

I am using the griddata interpolation package in scipy, and an extrapolation function pulled from fatiando: import numpy as np import scipy from scipy.interpolate import griddata import ...
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835 views

SAGA/GDAL fails to open grid in QGIS 2.0.1 on OSX 10.6.8

I want to try different grid/raster spline interpolation methods using SAGA in QGIS. I'm using the kyngchaos build 2.0.1-7 for Snow Leopard. Every SAGA algorithm I try gives the following in a popup: ...
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611 views

Empirical Bayesian kriging - does data need to be normal?

With empirical Bayesian kriging (ebk), does the data need to be normally distributed? If I apply a normal score transformation, my data is still not normal. Is ebk kriging thus an invalid ...
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785 views

Create a path following a road, interpolating from a set of points

I have several hundred vehicular routes within a city from which I wish to create shapefiles. These take the form of directions such as "From Green Street, turn left into Brown Street, Right into ...
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155 views

Which geostatistical tools to use to determine surface changes over 40 years?

I have a data from the Weather station with SWEmax (snow water equivalent) collected over 40 years. I need to interpolate the data over my river's watershed and then, somehow, determine the ...
3
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1answer
157 views

Soft edges for interpolation output

I've built the following heatmap using QGis 2.8.2's Raster->Interpolation feature. It looks almost the way I want: The background layer is Google Maps tiles by using the OpenLayers plugin. ...
2
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13 views

Rasterize will output 0 as NODATA (QGIS)

I have a data range which includes 0 ex +3 to -4. I would like the rasterize to include my 0 data (create a pixel) and just exclude the NODATA (where there is no points)
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43 views

Creating smaller sized grid and interpolating data from bigger grid

I am working with a vector grid that looks like this: I am not very experienced with QGIS and have been looking for a way to divide each mesh of the grid a certain amount of time to get a smaller ...
2
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21 views

Creating surface layer from Points in ArcScene

I work in ArcScene where i have some buildings in 3D, on the facades of these buildings in have points of solar intensity. I would like to create a continuous surface of solar intensity for each ...
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69 views

Error while performing kriging interpolation in QGIS 3.8.3

I am using QGIS 3.8.3 -Zanzibar in order to perform kriging interpolation. I get this error massage: "algorithm 'Ordinary kriging' starting… Input parameters: { 'BLOCK' : True, 'DBLOCK' : 100, 'FIELD'...
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61 views

Is there a way to create a DEM that follow the point cloud so you don't need to clip the DEM after?

I would like to create a DEM from an XYZ file (gridded 0,25x0,25) with 0,25 cell. I'm wondering if there is a way so that my interpolation follows my point cloud, instead of covering a rectangle like ...
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26 views

Clipping interpolated raster with shape of original point data-set

I have a point dataset with XYZ values. I inserted this layer in QGIS 3.6 via layer > add layer > add delimited layer. Then, I interpolated these points to a raster via interpolation > TIN ...
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26 views

Clipping interpolation layer to a coastal boundary in QGIS 3.6?

I have created an interpolation layer and want to clip it so I don't see the area outside the coastal boundary. map showing area to be clipped:
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101 views

Importing several LiDAR (.las) files in GRASS using v.in.lidar?

I'm building a DEM of a terrain in GRASS and have 48 LiDAR (.las) files. I know I can do this by using r.in.lidar (including the list of files as a .txt) and then r.fillnulls However, I want to ...
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110 views

Spatial Downscaling of global temperature in R?

I am interested in spatial downscaling of global temperature to grid cell. What I have is a vector of future annual global temperature values which I would like to downscale to (hopefully) 0.5°. ...
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191 views

Expanding raster within mask by interpolating it with boundaries set to 0

I'm having a hard time trying to expand a raster within a mask. Here are some details about my case: I'm working with glacier ice thickness rasters, which happen to be smaller than the real size of ...
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228 views

Creating 3D geographical maps for physical fields in qgis

We need to reproduce 3D maps of a certain physical property on a geographical area changing with depth (in the case of the example these are surfaces of equal subsurface temperature). The example ...
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66 views

Contour Plugin generated contours do not have enough nodes

I am using the contour plugin to generate intermediate contours. I have a vector file with 5 foot contours and want to interpolate 1 foot contours from it. The procedure I used was: Extract nodes ...
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0answers
62 views

How to create a surface area that interpolates and visualizes trends in physical activity in ArcGIS?

I have a dataset that contains several hundred telemetry points for my focal species around twilight hours. Attached to these points are mean values that represent how active the animal was 10 ...
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368 views

Create DEM from either few points or contours without elevation attributes

I have DWG file that contains couple of layers, among others I have "elevations" layer (that consists of only 80 points) and "contours" layer that can be seen on the images below. My goal is to make ...
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110 views

Should I Krige my contour data or use a different interpolation method?

I am using QGIS to calculate the terrain slope, starting from vector contour line data. Using linear interpolation like r.surf.contour gives me a reasonable looking DEM, but is not really useful if I ...
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98 views

Choosing interpolation method for monthly atmospheric parameters derived from AQUA/Air satellite?

I want to investigate atmospheric refraction and i am using Aqua/ Airs satellite data. These are atmospheric parameters (1) Air temperature (2) Geopotential height (3) Relative Humidity All these ...
2
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1answer
972 views

Interpolating every X distance along line in shapely

If I have a shapely multiline object that contains many lines whose total length each is 50km (when traced from the origin), and I want to interpolate along the multiline every X meters (let's say ...
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242 views

GDAL. Interpolation with breaks

I have a csv file dem.csv with data: LON, LAT, SO2(concentration) with NODATA=NAN. I need to interpolate my data from *.csv with breaks. I used gdal_grid with the command: gdal_grid -a invdist:...
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45 views

Can I interpolate but follow the trend of another surface?

I have a point data set will a fairly low sample density and a raster that should loosely correlate with the values of the points. For example, this could be elevation and temperature readings. I want ...
2
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0answers
535 views

Interpolating values for NaN pixels using ENVI?

I'm currently using MODIS data and am running into problems with NaN values in the final product caused by clouds. I'm interesting in a simple way to spatially interpolate (fill in) these NaN values. ...
2
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0answers
1k views

Interpolate vector layer and raster layer data into regular grid data using QGIS

I'm new to using GIS software. I obtained two different sets of data: Topography data (raster, .asc) Bathymetry data (shapefile, .shp, etc) I include topography data using Add Raster Layer and ...
2
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0answers
230 views

Maxent output clips to minimum extent of all input variables

I am experiencing an issue with the spatial extent of my output ASC files. I am using the UK Land Cover Map (LCM) 2007 at 25 metres resolution as a categorical variable in my Maxent modelling, ...
2
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0answers
239 views

Qgis raster interpolation shift

Using Qgis 2.0.1, I'm attempting to interpolate a large point dataset (n > 400K) to a raster surface. I'm using the IDW option in Raster>> Interpolation>> Interpolation, and the resulting ...
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0answers
274 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. ...
2
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0answers
626 views

Limiting the maximum and minimum values of an interpolation surface tool (ArcGIS, Spline)

I've been using the spatial analyst spline tool in ArcGIS 10.1 and was wandering whether it is possible to limit the maximum and minimum values to those of the z-attribute. Currently the spline will ...
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0answers
1k views

z-Coordinate and interpolation plugin in QGis

I've a csv file that includes weather stations locations (x,y,z) and precipitation values. I loaded the file by using add delimited text and then converted it into a point shapefile WS84. By using the ...
2
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0answers
346 views

Interpolate current Course value of GPS using previous Course values

I have a set of GPS data with Lat, lon and Course. I need to interpolate current value of course, using previous values of Course. The formula I am using is not accurate in curves.In C language I was ...
1
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1answer
28 views

DEM interpolation, QGIS 3.10

A friend of mine gave me DEM resolutions of cells 5x5m, but there is something wrong with interpolation. When I try to make a cross-section of the terrain I get a pretty inaccurate cross-section, with ...
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0answers
50 views

Interpolating xyz-points to raster in QGIS

I want to interpolate xyz-point data to a raster. x,y,z 3435339.20,5412714.28,-0.22 3435340.19,5412714.28,0.06 3435339.20,5412715.28,-0.20 I imported it as csv and saved it as shape. Then I ...
1
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1answer
49 views

Finding nearest points to an interpolated point along a Shapely linestring

I'm using Shapely to interpolate points every 500m along a linestring. For each interpolated point I'd like to find the nearest original points (immediately before and after) in the linestring. (I'd ...
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0answers
29 views

Rasterize right method for true value of point grid?

Is rasterize an interpolation or does it just burn in the "true" value of the point? I have a grided data that is evenly spaced and dense. I would like to just have a raster with the "real" value of ...
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0answers
37 views

Why is my Nearest neighbour outputting higher value in a equally spaced grid?

So I got a point layer which is equally spaced 0,5x0,5. When I run the nearest neighbour and accounting for the extent so that the raster cells are centered, I get this result. I got maybe five areas ...
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0answers
30 views

BASEmesh plugin error while interpolation between quality and elevation mesh

I am creating a 2D hydronumeric model of a watershed. The quality meshing and elevation meshing are fine, but I am getting the following error during interpolation. Does anyone know what should I do? ...