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

learn more… | top users | synonyms (1)

1
vote
1answer
19 views

QGIS: SAGA-GIS module “Add raster value to point” Error: unknown option 'INTERPOL'

I encountered an error while using the "Add raster value to point" SAGA-GIS module in QGIS (2.16) to retrieve altitude values from a raster DEM previously interpolated from TIN points (as vector ...
0
votes
1answer
23 views

Can't choose interpolation attributes of my shapefile

I am attempting to interpolate data of a point shapefile. In the attribute table all attributes are shown correctly. When I am trying to interpolate them with Raster >> Interpolation no attributes to ...
1
vote
0answers
34 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 ...
1
vote
0answers
24 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 ...
0
votes
0answers
33 views

Create route by hand

Is it possible to create a route placing some waypoints by hand? I mean, I don't want the program (QGIS) to link consecutive points with a simple line... I want it to link the points following the ...
2
votes
0answers
39 views

How to interpolate raster data using computer vision (OpenCV)?

Background A raster file collected via LIDAR records the topography of a watershed. To properly model the watershed, the river must appear continuous without any breaks or interruptions. The roads in ...
2
votes
1answer
39 views

Gstat krige() error: Covariance matrix singular at location [917300,3.6109e+06,0]: skipping

Recently, I am facing a strange problem when using krige() in gstat library. This error was not there a few months ago because I am using the same code with the same data that I successfully used ...
0
votes
0answers
15 views

ArcGIS trim-mean interpolation

I am trying to create a raster dataset from regularly spaced point data. I would like to use a trim-mean function rather the more standard mean function. Is it possible to do this?
0
votes
1answer
36 views

get lat/lng of an object X inches from the GPS

I'm working on a project where I have a gps and two receivers to create a triangle with a transmitter. The problem I'm trying to figure out right now is how can I get the position of the two receivers?...
1
vote
1answer
66 views

Visualizing interpolation result with three js in QGis

I used topographic map to trace the contours in QGIS. For each line, I added an attribute value (ex. 565, 564, 563 etc). After that, I used the IDW and TIN interpolation methods to create a couple of ...
0
votes
0answers
14 views

How to perform an anisotropic Elliptical Inverse Distance Weighting (EIDW) interpolation in R?

River bathymetry is generally more variable in the transverse than the streamwise direction, so I need to use anisotropic interpolation technique like Elliptical Inverse Distance Weighting (EIDW) (see ...
1
vote
0answers
50 views

False calculated slope?

After the DEM creation, I wanted to create slope layer. However the result has not satisfied me. I don't think the slope map is correct. Have you ever encountered false calculated terrain map?
1
vote
0answers
29 views

ArcGIS Interpolation IDW and Spline, extreme values

I am trying to interpolate air pollution data that is displayed in 1x1 Km points in ArcGIS. I am having two issues: When I try to interpolate using IDW, the software freezes at 94% "building search ...
1
vote
0answers
41 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 ...
1
vote
0answers
27 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 ...
1
vote
3answers
37 views

Interpolate Shape point data with integer data into raster

I have a shape file I brought into QGIS with a lot of point data. One of the data layers represents an integer value that is assigned to each position. I am attempting to create a raster map of ...
0
votes
0answers
71 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,...
0
votes
0answers
12 views

Overlaying data from a raster generated using Interpolation tool with Shapefile or a raster

For my project, I intend to identify if parameter A has been exceeded in forests. I have a shapefile for forests and converted that to a raster (if needed). I have point data for Parameter. I used the ...
0
votes
0answers
8 views

What is the standard method of finding satellite positions in between the 15 minute intervals in an SP3 file?

SP3 files provide satellite positions for every 15 minutes. How would you find the satellite position at a time between two logged positions, i.e. 7 minutes after the last logged position? I can ...
1
vote
0answers
29 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 ...
1
vote
1answer
47 views

Interpolating bathymetric data to make a volume estimate

I have 3 m resolution bathymetric data of a lake that I want to use to make a volume estimate of a landslide deposit that is on the lake floor. Basically, I want to interpolate the bathy data to make ...
6
votes
2answers
84 views

Why do I get a shattered-glass effect when I turn on hillshade for my IDW surface?

I made an interpolated IDW surface with a cell size of 500. In the symbology tab of ArcGIS, there is the "Use hillshade effect" checkbox underneath the classification area. When unchecked, my surface ...
0
votes
0answers
21 views

How can I create a NetCDF from precipitation rasters data in R? [duplicate]

I have a lot of precipitation raster data (more 5000 files GeoTIF), created by kriging interpolation. All grid cells have the same size and the maps the same spacial extent I want merge all data in ...
2
votes
1answer
129 views

Error in In predict.gstat in R

I am trying to do kriging by gstat pcakge through R. Here is my Code: krg<-krige(var ~ 1,data,grid,model=vgm,nmax=30) But each time I recive this warning: 1: In predict.gstat(g, newdata = ...
0
votes
1answer
57 views

Creating SpatialPolygons in R

I am trying to do kriging with my data. But there is a problem here. I want to use krige command in gstat package. But I do not have "Spatial object with prediction/simulation locations". How I can ...
2
votes
2answers
74 views

Topography data to elevation raster

In a previous question (convert-xyz-points-to-topography-and-calculate-mean-slope), I asked how to interpolate point elevation data to a raster in order to measure slope. Thus I use the Raster > ...
0
votes
0answers
29 views

R: how to correctly set number n for sample grid for IDW?

I'm trying to make IDW in R. In my tutorial, I found this approach which is easily understandable, expect of one point - why they used n = 6000 ??? how did they established the value to create a grid ...
3
votes
1answer
50 views

Use Interpolation extension from python

I would like to use interpolate point data to create a raster in QGIS. I am doing batch analysis so I would like to use a python script. I found this question : how-to-add-an-interpolation-raster-...
3
votes
1answer
75 views

Interpolating multiple years of daily precipitation data to generate daily time series? [duplicate]

I am trying to use ArcMap ver. 10.2 to create several models using ModelBuilder. The model will be created to: interpolate 7 years of point measured precipitation data (long integer format at a ...
1
vote
0answers
30 views

Densification of Point Layer to get smaller Voronoi Areas

I'd like to densify a point layer to get a better spatial distribution. With "better" I mean homogeneous distributed. If I had to quantified my improvement, I would calculate the voronoi diagram and ...
0
votes
0answers
29 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 ...
0
votes
0answers
74 views

collocated cokriging with gstat in R

I am trying to perform cokriging with temperature as the target variable and elevation as a secondary variable. Elevation (the secondary variable) is collocated with temperature (the target variable) ...
0
votes
1answer
27 views

Manually changing/suppressing z-values in Spline with Barriers interpolation that are known to be erroneous?

I've included an image of a project I'm working on. There are two layers representing sub-surface geologic formations, and these were generated using elevation borehole data (so, point data), to ...
1
vote
0answers
24 views

Precision of marker being placed on polyline

I'm attempting to place a marker on a polyline between two lat/lngs at a given percentage. Now, I know I can do this with google maps, but I need to be able to calculate it in backend code and return ...
1
vote
2answers
70 views

Getting similar IDW results using Spatial and Geostatistical Analysts for spatial interpolation of data with many zeros?

My data are plant biomass data from hundreds of sites. Most sites have zero biomass; these zeros are real. Thus, my data violate most assumptions of geostatistical interpolation methods (confirmed ...
0
votes
0answers
33 views

Creating pooled variogram in gstat

I am currently using gstat to perform ordinary kriging on daily fields of some variable - that is a new variogram is fit for every daily set of observations. I would like to compare this with ...
2
votes
1answer
182 views

QGIS: what is the difference between heatmaps and interpolation plugins?

I need to generate a raster looking like a « heatmap » based on a points layer. On this layer, each point represents a nest (bird population study). I need to produce a nest density map (raster) from ...
0
votes
0answers
49 views

Edit script to use in ArcGIS-R-Bridge

I have an interpolation script running in R which I now want to implement into ArcGIS so I can use it independently with any shapefile. To get to a result I scripted in 3 steps: Original R script: ...
2
votes
1answer
53 views

Interpolation from WFS point layer

In QGIS, I added a WFS-Layer from my geoserver, containing few point data with a numeric attribute (Z-values). This works fine, and all the points display on the map. Now I just assumed, I would be ...
0
votes
1answer
74 views

How to calculate and compare RMSE between DEM using different interpolation methods?

I have data from aerial photo, it was built from stereo photo so I have 3D information that I am using for the DEM. I extracted it into shapefile. I want to get RMSE (Root Mean Square Error) from ...
0
votes
0answers
89 views

Time series linear interpolation method for cloud not processing properly in my MODIS dataset

I am trying to perform an interpolation to my 3D array (sub-block of MODIS time series dataset with a shape of (46,960,960)) using numpy linear interpolation method to replace cloud pixels with ...
2
votes
2answers
38 views

Interpolation of point data with different scope

I need to interpolate a raster from point data (air pollution stations data). What I want to achieve is to distinguish the station's scope (or range or scale). For example some station's data are ...
4
votes
1answer
172 views

Interpolate temperature data (shapefile) using R

The answer below solved my fist question, so I edit my question as follows: I have a shapefile given with the attributes lat, lon, elevation and temperature. So far I have a script that interpolates ...
1
vote
1answer
116 views

Modify 3D numpy array using interpolation

I have a 3D array that I want to interpolate the np.nan values along the z dimension, and I just want the changes to modify my existing array. However, the changes seems not to be working. I have a ...
1
vote
1answer
95 views

Inverse Distance Weighted (IDW) Interpolation with Radial Basis Function (RBF) in R

I want to perform an IDW interpolation with R. I am aware that I can do that with gstat::idw. But I want to change the parameter 'idp' with a radial basis function (RBF): where is the ...
4
votes
1answer
43 views

Are there any spatial interpolation methods that take into account inequality constraints?

For example if I'm interpolating a water table map from groundwater levels measured in wells and I have a location where a well has gone dry, I don't have a measurement of the depth to water, but I do ...
3
votes
1answer
82 views

Automating Interpolation in QGIS

I have a project in QGIS which involves interpolating several different variables on several different maps, then using the raster calculator to multiply some of the resulting interpolations together. ...
3
votes
0answers
48 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 ...
1
vote
0answers
95 views

How to automate the QGIS Raster Interpolation Plugin using python console?

I have a rainfall data from 1961 to 2015 for each day of this years. I need to create a raster for each day with this configuration. Do you know how to automate this using this plugin and python?
3
votes
1answer
122 views

Error while comparing two raster layer in R

I have got a geographic point distribution with N prehistoric settlements with a size of x and want to compare the distribution with an economic simulation, which produces M settlements (Usally N > M)....