# Questions tagged [interpolation]

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

151 questions with no upvoted or accepted answers
Filter by
Sorted by
Tagged with
22 views

### Is latitude valid as covariate for spatial interpolations?

I have information of minimum and maximum mean monthly temperatures Tmin and Tmax, respectively), from more than 300 weather gauges and now I require to create interpolated surfaces of temperatures ...
24 views

### Digitized contours on map and interpolate contour line to create surface

I have digitized the contours on a map and I want to recreate the surface by interpolating (using IDW) using these contour line. When I generate contours (extract) to see how well they match with the ...
58 views

### Interpolate values in QGIS attribute table

I've got a point shapefile of river sonar data. It got only two fields: id and depth. I want to interpolate depth of selected 40 points (arranged by id) value from 1.49 to 1. Any idea how can I do it ...
57 views

### Interpolating Z values from XYZ point dataset to alternative XY coordinates in QGIS

I have a dataset with X1,Y1,Z1 values (x coordinate, y coordinate, elevation -> the red dots in the image below). I also have another dataset with alternative X2,Y2 coordinates (-> the blue dots in ...
82 views

### Way to speed up TIN interpolation (Delaunay triangulation) QGIS 3

Are there ways to improve processing time for TIN interpolation? I'm using TIN interpolation as a step in a larger process. The interpolation step is taking a very long time (10+ hours to a few ...
108 views

### Interpolating VRT to Geotiff using gdal.Grid in Python creates null image

I have a set of points with X, and Y coordinates and associated Z values POINT (-102.9071045 31.43453407 1871.930298) POINT (-102.8339386 31.45111084 1856.14209) POINT (-102.4687424 31.53144836 1869....
29 views

### Resampling while drawing rasterfiles in QGIS 3?

I can not find a solution to resample my rasterfiles in QGIS 3. With Arcmap usually I use "resample while drawing" with the method cubic or bilinear interpolation for continuous data to smooth my ...
28 views

### Multiply two image collections with different sizes based on dates

I have two image collections. They are both filtered by date beginning on Jan 1, 2019, and ending on today's date. The size of the first (kc) is 35 images and the second (ETo) is 225. The first has an ...
59 views

### IDW interpolation using QGIS?

I want to obtain the quantity of precipitation for each municipality in Brazil on a given year. For that, I'm trying to use IDW interpolation on QGIS to interpolate the precipitation data from weather ...
34 views

### ArcMap: interpolation for single polygons individually

The red polygons in the image represent the boundary of infills. The raster (colored area) within the polygons is interpolated from the point shape file (black dots). The image shows an example where ...
248 views

### R kriging raster returns NA for some prediction points?

I am trying to interpolate a raster layer of chlorophyll-a data using kriging (gstat::krige) in R, however the resulting interpolation is showing NA values in a peculiar straight line through the ...
139 views

### Getting AttributeError: 'NoneType' object has no attribute 'sourceCrs' from TIN Interpolation in QGIS?

I am trying to use the TIN interpolation to interpolate conductivities between a vector layer in QGIS 3.4. and I always get this error: Traceback (most recent call last): File "C:/PROGRA~1/QGIS3~1.4/...
55 views

### Overcoming spatial bias in ArcMap or ArcGIS Pro?

I have a shapefile showing invasive plant locations but they mostly collected from more accessible places such as near roads or hiking trails. Is there a method to correct this bias in ArcGIS ...
27 views

### Using convex hull for interpolation of individual plots or lump plots together in ArcMap?

This question is inspired by Using kriging to extrapolate values outside of sampling polygon in ArcMap? I'm working on a project trying to understand the lasting effects of historic scientific ...
31 views

### Interpolating sea level data using ArcGIS Desktop?

I have monthly sea level data obtained from PSMSL in the form of excel sheet for the region Chennai. I want to interpolate the data in ArcGIS Desktop. The shapefile of the region has Polygons and I ...
26 views

### How to create a surface layer from gridded point data of air temperature and Precipitation?

I want to aggregate monthly averages of temperature and precipitation over a 10-year period into weighted seasonal averages (DJF) for use in interpolation. I have downloaded Shapefiles for each month (...
43 views

### Interpolate and export the following points

I have two crossections of the same position. I am looking for a way to interpolate the blue points from the attached image. I need the xyz values of the interpolated points, how can I do this? I ...
39 views

### Python function like SAGA Grid Gridding?

For a python script, I'm searching for a function that does the same as SAGA Grid gridding, an exponential interpolation on GeoPandas GeoDataFrame. Does anyone know one?
56 views

### Trying to interpolate depth measurements of a pond

We have taken depth measurements across a pond, and have a CSV file with each location's GPS coordinates and depth in meters. We are trying to create a map of this pond showing where the channel is ...
114 views

### Error interpolating in Qgis

I'm trying to interpolate with the algorithm "v.surf.idw" in Qgis version 2.18 Las Palmas. The data that i'm using are points whose coordinates were loaded by a CSV file, these the guade as a new ...
87 views

### QGIS Mask - Error Code

I am trying to interpolate points and then clip the interpolation with a Raster> Extraction> Clipper. I receive an error code after trying to mask over the region I am interested in. Would you ...
40 views

### Different variations of point-to-zone mapping

I have created a grid of 1Km2 over some census zones. Now, for each cell of the grid, I need to provide some characterization of it: population, socio-econ, etc. coming from the census zones. So, ...
156 views

### Can I control how GDAL interpolates the edges of an array?

I am currently using GDAL 2.1.0 in a Python script to reproject a geotiff with a given pixel size into an other geotiff with the same projection, but with a different pixel size. To do so, I use the ...
67 views

### Qgis Interpolation TIN from srtm

I'm new in qgis and I'm trying to realize a DEM from contour follow this tutorial https://www.youtube.com/watch?v=Lzd5m0j3zTI&t=81s My data came from seven SRTM frame downloaded with plugin in ...
253 views

### How to create raster from data (x,y,z in Cartesian coordinate System)?

I have simulated many trajectories of an moving object. From simulations I have obtained data files where the trajectory is saved in terms of x,y,z coordinates recorded at equal time intervals. Each ...
149 views

### Tool for linear interpolation with a mask?

I'm asking if anyone knows a tool to do a linear interpolation that supports masks / barriers. I need to do interpolation on a archipelago and no points on opposite shore should affect on a other ...
108 views

### Interpolating sparse bathymetry to correct global grid using ArcGIS Desktop?

I am using ArcMap 10.5.1 I am trying to update a global bathymetry grid (at 1 min resolution) with local sounding data (resampled to 1 min resolution). The sounding data is sparse and irregular in ...
176 views

### Interpolation resulting in nan

I am trying to interpolate a point layer holding data of type double, I have gone back to older projects where I have successfully interpolated before and these don't work either (resulting in nan). ...
314 views

### Downscaling 1km data to 250m with points

I am doing some species distribution modeling with MODIS 250m data, and would like to downscale 30 arc-second (1km) bioclim data to 250m so that I can use them in my models. My idea is this: Rather ...
174 views

193 views

### How to do kriging on a country map from a linear model

I would like to use ordinary kriging to interpolate model predictions on a grid. In my code underneath, GPS is a 'SpatialPointsDataFrame' and EU is a 'SpatialPolygonDataFrame'. All covariates for ...
142 views

### how do I fix this QGIS TIN error?

I'm trying to interpolate a point file that comes from a surface water model output. Each subgrid point has an elevation, and that was used with the cell water levels to generate values for percent of ...
362 views

### Interpolating geographically weighted regression (GWR) - fit to raster?

Using the spgwr package I followed this tutorial and found a way to interpolate the result to a raster layer (gwr on pixel/raster data using the meuse data set, further down the script). But the ...
473 views

### Interpolate points against angled polygons

I have a shapefile, made up of many individual polygons that are essentially arranged in a pixel structure (this file: https://data.gov.uk/dataset/vessel-density-grid-2014). I am interested in the ...
81 views

### Converting point kriging surface to small polygon data set?

I have a dataset showing soil samples as points and the nutrient contents at each of these sample locations. I have created an interpolation surface that represents the distribution of nutrients ...
181 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 ...
63 views

### Cross-validation error threshold in ArcGIS

I'm learning the Geostatistical Wizard toolset in ArcMap 10.4.1 and I am performing the cross-validation step in an IDW interpolation. I have done some research regarding the process of cross-...
351 views

### Interpolation in QGIS

I am interpolating a large gridded DSM in QGIS. I end up with 5 or 6 lines across the final raster, which drop (or raise) the elevation by c.5m if you plot a profile across them. Ther are relatively ...
35 views

### Interpolation of survey travel data for transport modelling

I am looking for a way to interpolate survey travel data (in VKT) for transport modelling. I have the dataset of VISTA residential transport survey at meshblock level, but I need to get VKT (Vehicle ...
283 views

### Creating prevalence map using QGIS?

I work with infectious disease. Right now i want to create a map showing a prevalence of infected people during an outbreak of the disease. So I have coordinate data of infected/uninfected people ...
229 views

### Trouble with Elevation Profiles in QGIS

This is a newb question and I hope you all will be patient. The answer should be simple (I hope.). I obtain gif and shp files from flying a drone and processing the images with DroneDeploy. The 1ft ...
382 views

### Interpolating Temperature over Elevation on ArcMap

I need to overlay or create a new image file in ArcGIS that overlays temperature point data I have for California onto a 30m resolution DEM for that state. I have explored Co-Kriging, however I have ...
93 views

### How to interpolate a set of waypoints?

I am trying to interpolate a Vector Layer in order to have as many waypoints as possible. I am doing it with the Interpolation Plugin, but I don't know what to do with the Raster Layer generated (I ...
70 views

### cellinp and cellout in v.vol.rst

I am trying to use v.vol.rst in Grass 7.0.4 to interpolate temperature values considering elevation. The answer of Grass to my attempts is: WARNING: Unable to create cellout raster map without cellinp ...
164 views

### Understand ramp color interpolation using QGIS 2.12

I try to understand the color ramp in TIN and IDW interpolation. I work with height points layer. The low value in 8 and the highest value is 584. With the interpolation plugin i create TIN raster ...
743 views

### R-Studio0.99, How to compute correlation between two rasters and serial correlation

I am using R.Studio0.99 version installed on my HP Laptop 4th generation (8GB RAM) windows 8 operating system and I know how to use R studio and some of the library to incorporate spatial data (raster,...
64 views

### Grid interpolation using a new calculated field

Still learning.... I am trying to run the grid interpolation tool on a point shp file. I can successfully use the tool with the existing data but cannot run the tool on a new field I created in the ...
79 views

### Interpolating logarithimic values - groundwater pH

I am using Spatial Analyst to interpolate surfaces for several groundwater parameters based on point observations at monitoring bores, including groundwater level and pH. It suddenly occurred to me ...