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

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30 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
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2answers
54 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 > ...
2
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1answer
522 views

How to obtain closest point of point over polylines layer in PostGIS 1.4 (without st_ClosestPoint)?

I´ve got a polylines layer (pipes) and a points layer (valves) and In Postgis 1.4 I would like to obtain the closest points but exactly on the closest polyline. In other words, i need to locate each ...
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0answers
16 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
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1answer
41 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 : ...
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0answers
29 views

Python script iterator to interpolate accross multiple fields of attribute table

I interpolated precipitation data in ArcMap (ver. 10.2) using a surface-fitting tool [e.g. Global Polynomial Interpolation (GPI)]. I built a GPI model using model builder in ArcGIS 10.2, but the model ...
3
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1answer
32 views

How can I interpolate multiple years of daily precipitation data to generate a daily time series?

I am trying to use ArcMAP ver. 10.2 to create several models using model builder. The model will be created to: 1) interpolate 7 years of point measured precipitation data (long integer format at a ...
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0answers
26 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 ...
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0answers
26 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
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1answer
189 views

How to create soil-type maps using QGIS

I am trying to create a soil-type map of an area from point data using QGIS. I tried interpolating the data, since soil is continuous. I did this by allocating a number to each point type and then ...
4
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0answers
115 views

Interpolating species data from sample points in a small area [closed]

I have sample data from a small site (10 acres) which shows the number of occurrences of a particular species of snail over two sampling periods (fall and spring sampling). I want to try and ...
7
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4answers
4k views

How to interpolate temperature correctly?

I tried to interpolate the mean avyerage annual temperature to produce a "realistic" surface.In qgis I used Raster-Interpolation-Interpolation. Both methods TIN and IDW did not deliver a "realistic" ...
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43 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) ...
2
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2answers
402 views

Store GPS trace with timestamps, then interpolate location by time

I'd like to: Load a 1-second interval GPS trace (not GPX) into PostGIS Then query the table at sub-second accuracy (about 5Hz), and get PostGIS to interpolate the location by time. Is this ...
0
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1answer
274 views

Creating an R factor raster in RUSLE Soil Loss equation with multiple input rasters

I am attempting to obtain the rainfall erosivity "R" factor for the RUSLE Soil Loss equation using rainfall PRISM 30 year history data. I have both monthly and annual data that comes into ArcMap as ...
0
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1answer
21 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
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2answers
48 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 ...
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0answers
22 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 ...
2
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1answer
153 views

Interpolation code with Mapbasic

I have a drivetest data, and usually I do an interpolation using the values taken in the drive with their respective lat/long. I use natural neighbor. You can see an example attached. I am trying ...
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0answers
27 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 ...
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0answers
42 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
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1answer
141 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 ...
2
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0answers
31 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
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1answer
43 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
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0answers
43 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
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1answer
969 views

Interpolating heights in DEM using ArcGIS API's in C# [duplicate]

I am new to ArcGIS and not familiar with it. I want to interpolate heights in a DEM file using ArcGIS? Is it possible? Actually, I want to write a C# code that will read the height from DEM file for ...
4
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1answer
115 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 ...
2
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2answers
35 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 ...
2
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1answer
1k views

Resizing pixel resolution after interpolation using ArcGIS Desktop?

I did kriging spatial interpolation using climatic point file. After doing interpolation, how can I resize the pixel resolution to pixel resolution of the NDVI data. NDVI image's pixel resolution ...
1
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1answer
65 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 ...
3
votes
1answer
191 views

Export to raster tool changes the output values

I am working with interpolated temperature data. The image's maximum and minimum values are 11.9 and -1.7, respectively. I exported this image to raster using export to raster, but the max and min ...
4
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1answer
371 views

Debugging errors of SAGA interpolation algorithms in QGIS 2.0 Processing

I encounter recurrent problems with the geoalgorithms that perform interpolations. No matter technique I use I end with the following errors. As state in OGR tab QGIS is unable to open a file in C ...
4
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1answer
41 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 ...
1
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1answer
59 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 ...
2
votes
1answer
158 views

TIN Interpolation in QGIS creates weird lines?

I am using TIN Interpolation to interpolate point features based on their cost attribute (value is between 0 and 5000). Graduated symbology creates something like this: However when I am using TIN ...
3
votes
1answer
567 views

Spatial Interpolation Methods like PRISM

I am looking for some kind of software (free software) that allows me to make an interpolation like PRISM software. The interpolation used in PRISM is a local regression and accounts for ...
3
votes
1answer
67 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
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0answers
41 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 ...
3
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1answer
97 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 > ...
3
votes
2answers
95 views

Measuring error of Spatial Analyst interpolation such as spline, nearest neighbor and kriging?

I am planing to use interpolation method using spatial analyst tool and I found several methods like spline NN and kriging. I know I can do interpolation using geostatistical analyst but some ...
1
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0answers
63 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
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0answers
49 views

Building a DEM with both a raster and vector points [closed]

So I'm struggling here, trying to get a decent DEM for the Azores Islands because I want to include bathymetric data on it. I have a raster with elevation for the islands (land) with a 30 meter ...
1
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0answers
42 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 ...
2
votes
3answers
332 views

Is kriging an exact interpolation method?

Can kriging be an exact* method? For example, when optimized with the Geostatistical Wizard? Or in any other way? (as far as I know, "normal" kriging isn't an exact method). *exact: predictions at ...
2
votes
1answer
64 views

Raster interpolation with gdalwarp, and replicating with python API

My problem is similar to this: Replicating result of gdalwarp using gdal Python bindings. I want to resample a raster using bilinear interpolation, which I've done successfully with gdalwarp by adding ...
4
votes
1answer
157 views

Converting Points to Cells using ArcGIS Desktop?

How do I create such map from point data? I am using ArcGIS 9.3 and 10
1
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1answer
33 views

Getting from PDF contour map of Z in area to values of Z specific points in area?

I have a PDF of a contour map of value Z for an area. For the same area, I have a set of points that I would like to match with Z values interpolated from this contour map. For an individual point, ...
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0answers
20 views

What are the practical differences between Moran's I and Geary's C

What are the practical differences between Moran's I and Geary's C for gridded datasets (e.g. temperature) on a continental scale such as USA? Which is more applicable?
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0answers
62 views

Interpolate missing M values along a line

Is there some way in PostGIS to interpolate missing M coordinates in a geometry like this? select ST_MakeLine(ARRAY[ ST_MakePointM (0, 1, 10), ST_MakePoint (0, 2), ST_MakePoint (0, ...
5
votes
2answers
806 views

Calibrating routes gives interpolation error in ArcGIS Desktop?

I know that copy a question is not exactly great way to ask on this forum, but my situation is exactly the same as this unresolved issue on the (closed) ESRI forum: I have a stream centreline ...