Questions tagged [interpolation]

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

Filter by
Sorted by
Tagged with
0
votes
0answers
15 views

Spatial Interpolation using non numerical dataset

I am working with a soil point dataset (numerical values and non numerical values associated with a GPS point). I am able to successfully import the spreadsheet and do a spatial interpolation of all ...
-1
votes
0answers
50 views

Interpolating using QGIS

I have tried to run an interpolation on QGIS multiple times and nothing is happening. I've adjusted the raster size to every possible value, but I'm not getting anything. In this screenshot I'm ...
1
vote
0answers
13 views

Points interpolation on a polygon geometry

I would like to know how to interpolate point data on a polygon geometry. I have two PostGIS tables: the first one contains hourly rain values evaluated in the nodes of a regular grid (specified in a ...
4
votes
1answer
93 views

Creating ids of middle point of line

I have line layer as shown in image 1. I created middle point of line by using the below query in virtual layer. SELECT ST_StartPoint(ST_Line_Substring(geometry,0.5,1)) FROM "TR_ROAD copy" ...
1
vote
0answers
33 views

QGIS: Spatial extrapolation

I have few sample points with values on (agricultural) field and I want to interpolate and extrapolate values inside the field boundary. Ideally I would like to use Kriging (as it smooths local extrem ...
1
vote
0answers
26 views

Upper and lower bounds from gstat::krige() and gstat::idw()

Is it possible to obtain lower and upper bound values from a kriging estimation using gstat::krige() in the same way it can be obtained from a simple lm() model? The following lm() example comes from ...
0
votes
1answer
17 views

GRASS GIS v.surf.idw not working correctly

I have recently been struggling with an issue in GRASS. I am a new GRASS user and recently downloaded version 7.8.5 for my MacBook (macOS Catalina). I converted this sample dataset to a shapefile. I ...
7
votes
3answers
215 views

PostGIS: Interpolate/Cluster geographic points to average points

Setup: PostGIS 3.1, QGIS 3.16 I have a bunch of geographical data (geometries). They show more or less the same route, just measured several times. Due to the many measurements and the GPS precision, ...
0
votes
0answers
19 views

Interpolation of CSV Data [duplicate]

I have been doing an interpolation of rainfall data using QGIS and the interpolated data has a line which make the data uneven and the isohyets are being cut at the boundary line of 180 Degrees. I ...
1
vote
0answers
33 views

Error when executing TIN Interpolation with two sets in QGIS

I am trying to TIN two datasets using TIN Interpolation with XYZ points in QGIS. I keep getting this error: Traceback (most recent call last): File "/usr/share/qgis/python/plugins/processing/algs/...
0
votes
1answer
48 views

Interpolating LineString by adding new Point in middle between each two points [closed]

I want to add interpolated points in a LineString using shapely. The interpolated points should be in the middle of every two Points present in the LineString. The shapely interpolate function adds ...
0
votes
0answers
10 views

Convert Areal Interpolation raster into polygons weighted by population (ArcGIS Pro)

Using the Areal Interpolation function in ArcGIS Pro, I have an interpolated raster layer of disease counts. This was derived from a district-level dataset. I am now wanting to portion this raster ...
1
vote
1answer
47 views

How to create a grid to do kriging interpolation that correspond to areas in a map having actual observations?

I need to do kriging interpolation but wanted to have the interpolation in areas where I have actual data; not across the whole map. This is my example. Here is the base map (shp file in a .zip file): ...
1
vote
0answers
71 views

Doing TIN Interpolation in QGIS

I want to do TIN Interpolation on a layer but when I fill all the fields with the right data (vector layer, interpolation attribute, extent etc) the algorithm does not run and shows me this message: ...
0
votes
0answers
47 views

Calculating GPS coordinates given distance between points

I have 2 points where I know the GPS coordinates of one of the points. Additionally, I know their coordinates in some reference frame where I can calculate the distance between them in real world ...
2
votes
1answer
40 views

Why krige function return all NA's values for the prediction when trying to interpolate a variable?

I am trying to build a map with kriging interpolation for a variable. When running the krige function the return is all NA values and the kriged map plot only one value. I couldn't find out why and I ...
3
votes
2answers
87 views

Is Satellite Image Continuous Data?

I have a satellite image of one region. I perform interpolation on this image. However, I am not sure Satellite Image is continuous or discrete data.
2
votes
1answer
54 views

Interpolate only no value cells not connected to the egde of the raster

Is it possible to interpolate geotiff raster no value cells that are not connected to the geotiff border by other no value cells with QGIS or other freely available tools? The grey areas are gaps. I ...
6
votes
3answers
164 views

Do I necessarily need coordinates for spatial prediction?

Commonly, it is stated that spatial prediction is the same as spatial interpolation, i.e. the estimation of values based on the observations' location: y ~ lon + lat Others state, that spatial ...
0
votes
0answers
38 views

How would a Kriging model react to different z values at same point

Say I have a very large dataset of values collected at points over many years. For the sake of an example, we'll pretend it's the altitude at certain lat/longs. If some of those points appeared twice ...
-1
votes
1answer
28 views

IDW interpolation in ModelBuilder by column in ArcMap

I want to interpolate using the IDW method in ArcMap. I have to interpolate the values of several months for several years. I have the data in a shapefile in which each column has the values for each ...
1
vote
1answer
41 views

Generating new data in curve (polyline) by interpolation of existing data in this curve

I am trying to add altitude data on the vertex of a polyline in QGIS. I have extracted points from the vector layer of the polyline to update the Z-value. I have altitude for some points, new points ...
1
vote
0answers
18 views

How to do a Correlation of various Raster Data and show the result in a Correlation Matrix

I am doing spatial correlation of soil Data sets. I did various Kiriging Interpolations with the krige function. The output was cut to a target raster to have the same raster size for all Kriging ...
4
votes
0answers
43 views

Interpolating Z at polyline vertices between known Zs

I have polyline strings with vertices of known elevation / z height and intermediate vertices with null/zero height. Known Zs are spread throughout the line. I'd like to be able to populate the z of ...
1
vote
0answers
30 views

Forcing boundary conditions in interpolated/kriged data?

I am using pykrige.ok import OrdinaryKriging to generate a spatially continuous field from sparse point data (see image below). The data (glacier ice thickness) are such that there is a hard boundary (...
-2
votes
1answer
68 views

Seeking open source alternative to Spatial Analyst / 3D Analyst toolbox of ArcGIS Desktop

Is there a decent open source software alternative for the Spatial Analyst / 3D Analyst toolboxes of the ArcGIS environment? The main goal would be to demonstrate DEM interpolation and/or ...
0
votes
1answer
69 views

Error in “Extract values to point” in arcpy

I am working on spatial interpolation. To extract values for my required points, I am using "Extract values to points" tool from Spatial interpolation toolbox. The tool is working good in ...
1
vote
2answers
51 views

Including elevation information while temperature interpolation

I am working on ArcMap 10.5 for temperature interpolation. I am using IDW for interpolation. I need to compare the results with and without elevation data. However, I am unable to understand how to ...
0
votes
0answers
21 views

Kriging (or other interpolation) with integral constraints?

I would like to interpolate a continuous variable (from observed point locations) on a surface (gridded) but using an external constraint that the cumulative distribution function of the interpolated ...
0
votes
2answers
72 views

Regridding a rasterbrick in R using bilinear interpolation

I have a rasterbrick (of monthly precipitation data from 1901 to 2018) and it is currently in a at a resolution of 0.5, 0.5 x,y. here are the details of the data: class : RasterBrick dimensions :...
2
votes
2answers
78 views

Interpolating values in UTM grid [closed]

I've got a 10x10 km UTM grid (vector file), which I want to use for showing the distribution and abundance of a bird species. For each cell, I've got a value for the survey effort (number of days, ...
0
votes
0answers
30 views

Interpolating climate data over DEM in ArcMap

I tried to interpolate climate data using IDW by inserting DEM raster as a mask, but I got the Map of precipitation levels without taking into account elevation data. How can I get map of ...
2
votes
0answers
65 views

Having trouble with the Heatmap's (Kernel Density Estimation-KDE) interpretation in QGIS 3.10

i wanted to generate a density/concentration map of a parameter, in this case Carbon percentage in a water sample. The dataset in csv file looks like these : So, I imported the csv file then plotted ...
1
vote
1answer
100 views

QGIS: Interpolate height value on polyline from point-values for use as breakline in TIN-creation

We use point heights from a survey to generate a TIN. In order to improve the quality of the TIN, additional break lines should be defined. These break lines shall receive the height information from ...
4
votes
1answer
213 views

Spatial interpolation in PostGIS without outputting Raster

I have some data that is similar to rainfall, ie. a latitude, longitude, and a Z number. It is in a point layer that is a nice clean point grid. Many Z numbers are missing in this grid. I want to ...
1
vote
0answers
29 views

QGIS Linear Z interpolation on snapping

The interpolation of the Z value when snapping in the creation of a new feature is done well in QGIS 3.14, but when editing elements this does not happen. Is there any way to do it?
0
votes
1answer
32 views

How to interpolate sf LINESTRING to another pre-defined grid?

I have a set of sf lines, which on an irregular grid, in other words, they have random coordinates. Is there any way to interpolate LINESTRING coordinates to a regualr grid for example as defined ...
2
votes
0answers
127 views

Spatial interpolation of climate data using latitude, longitude and elevation in r

I have downloaded E-OBS gridded daily climate data on 0.1-degree grid. For each grid point, I have longitude, latitude, elevation and climate data, i.e. precipitation sum / mean temperature. Now, I ...
1
vote
0answers
121 views

Converting River Channel Cross-Section Data to Bathymetry

I have multiple surveyed cross-sections of river channels and need to convert this data into 3D polylines (shapefile) for use in a hydraulic model. The cross-section data is typically supplied in &...
4
votes
0answers
68 views

How does Empirical Bayesian Kriging of ArcGIS Pro handle sampling bias?

In ArcGIS Pro, simple kriging approaches allow you to de-cluster your data before applying a normal-score transformation. According to the Esri guideline, normal-score transformations are only ...
0
votes
0answers
58 views

Converting latitude, longitude to image coordinates

I have a 2D image and I know a given pixel in the image corresponds to a particular latitude longitude (so basically a reference point). The image I have is a camera image of an outdoor scene and I ...
0
votes
0answers
22 views

Fill/interpolate gaps in raster area WITHOUT extending the outer borders

I have a raster file that is related to a river bed in a curvy river section. Inside this raster file are gaps with no data (e.g. small islands, measurement gaps, etc...). I want to fill those gaps ...
0
votes
0answers
41 views

R-ArcGIS Bridge - Interpolation with gstat library

I have a problem with the idw or krige function from the gstat library in R. I'm trying to use the gstat library and the R-ArcGIS bridge to load a shapefile from ArcGIS into R, interpolate the data ...
1
vote
0answers
171 views

Creating and interpolating raster stack from CSV in R

I have a CSV of biweekly temperature values for the year 2011, at a 1000-m scale in part of the state of Iowa. The CSV contains ~95000 rows of temperature data, with the first 2 columns as the x and ...
0
votes
1answer
85 views

Image (band) interpolation

I have a set of sentinel 2A images. I eliminated those that contained too many clouds, and then I created a cloud mask using cloud probabilities and Otsu thresholding method to eliminate cloudy pixels ...
1
vote
1answer
59 views

TIN interpolation to construct DEM shows strange triangulation

I'm working with QGIS and I am trying to create a DEM starting from a DXF containing the grid of points located at 5m from each other. The following picture shows the points imported: I used a TIN ...
2
votes
1answer
89 views

Generating TIN and/or DTM from point feature data

I have parameter data that is linked to points within a polygon area. I am trying to find ways of creating an interpolated layer for the extent of the polygon within which the points are located as ...
0
votes
1answer
128 views

Interpolating z Values (height) from TIN (Raster) to line (vector) using QGIS

I have a raster (TIN) and I want to interpolate the heights (z-Values) to a line Shape. Everything that I find is interpolation between some points and making a raster. For example, Raster creation ...
0
votes
0answers
24 views

ArcGIS 3D Analyst Line Interpolator not working

I have a stack (8) of DEM layers. The 3D Analyst line interpolation tool is only extracting values from the first layer in the stack. I specify different layers in the 3D Analyst window butit still ...
0
votes
0answers
76 views

How to generate a DEM from a 3D point cloud in MATLAB?

I'm trying to generate a DEM (or a DSM if that works for this purpose) from a .ply point cloud in MATLAB so that I can generate a hillshade from it and this is what I have managed so far but have no ...

1
2 3 4 5
16