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

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4
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1answer
39 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
vote
1answer
16 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
131 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
547 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
45 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
28 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
votes
2answers
349 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 ...
3
votes
1answer
78 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
68 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
vote
0answers
35 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
0answers
34 views

Building a DEM with both a raster and vector points

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 ...
0
votes
1answer
204 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 ...
2
votes
1answer
481 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 ...
1
vote
0answers
25 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
244 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
39 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
vote
1answer
31 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, ...
0
votes
0answers
15 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?
0
votes
0answers
55 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
782 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 ...
3
votes
2answers
324 views

Strange spatial interpolation results from ordinary kriging

I'm using Ordinary Kriging to interpolate a set of spatial data. I'm working on different sets which represent different days of measurement. I get good results, apart from one specific set. Will post ...
14
votes
2answers
4k views

Minimum number of samples for kriging interpolation

I get some data with number of specimens with a request to interpolate it using kriging method. After some investigation it appeared that kriging results (performed in ArcGIS Geostatistical Analyst ...
3
votes
1answer
132 views

Validity of ordinary kriging of polygon centroids

I'm in a discussion with a colleague who believes that kriging should not be used to interpolate a surface from polygon based data (i.e. with kriging applied to centroids), because this effectively ...
2
votes
1answer
199 views

How to interpolate raster to get finer resolution?

I am working with precipitation raster layer. It happens the raster data to be in a resolution of 0.25 degrees grid. How could I interpolate those pixels to have a better resolution, say, a resolution ...
1
vote
1answer
40 views

Is there a minimum number of required samples/ data points for IDW Interpolation in ArcGIS for Desktop?

I am interpolating air pollution values from 6 data locations using IDW in ArcGIS. I know that more the number of points, more reliable the results are. But, I am not sure if a minimal number of data ...
3
votes
0answers
45 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 ...
3
votes
1answer
96 views

Difference between Spline (spatial analyst) and Geostatistical Analyst?

Why the interpolation result of Spline with Tension in the Spatial Analyst is different from the that in the Geostatistical Analyst (both in ArcGIS 10), including their minimum values, maximum values, ...
6
votes
1answer
144 views

DEM from contours

I have problem to create a DEM from contours. I know it is very simple but I can not make it work. I tried everything but nothing has happended! The shapefiles I've got are a con_lin and a con_pol ...
1
vote
0answers
24 views

Can MapboxGL use nearest neighbour interpolation for overlay image? [closed]

In HTML+CSS version of mapbox/leaflet I can set image-rendering option for .leaflet-image-layer with CSS to choose interpolation method. How can I make this in GL renderer?
1
vote
0answers
23 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 ...
1
vote
1answer
68 views

give importance weighting to sample points in an IDW-interpolation

I am trying to make an IDW-interpolation in arcgis 10.1. In my sample file i have points with the same x,y and z values. According the arcgis-resource-site, the points are considered duplicates and ...
3
votes
1answer
56 views

Does IDW interpolation in ArcGIS Geostatistical analyst work as exact interpolation method?

As we know, Inverse distance weighted (IDW) is an exact interpolation method, which means the interpolated values of the known samples should be the same with its original observed values. But when I ...
1
vote
1answer
44 views

Getting elevation readings at any lat,lon from shapefile with scattered irregular points

I have a set of x,y coordinates, each of which I'm trying to get an elevation reading for. The elevation data source, however, is not a regular grid, but consists of a shapefile containing scattered, ...
1
vote
2answers
74 views

Using kriging to extrapolate values outside of the sampling polygon

I have data points with values along 4 perpendicular transects. The kriging tool that I am currently using interpolates within the polygon created by the 4 transects, essentially a rectangle. I am ...
1
vote
2answers
94 views

How to interpolate data using quantum gis?

I am trying to interpolate distribution value of rain using IDW (inverse distance weighting) method using quantum gis. What steps do I need to undertake? The input layer data which I used there are 2 ...
1
vote
2answers
230 views

Which training courses in geostatistics can you recommend?

I'm looking for excellent geostatistics courses all over the world, including online courses. In particular, I would like to learn more about the kriging method. Can anyone give me some suggestions?
2
votes
1answer
60 views

Improve performance of a PostGIS st_dwithin query

I am doing a local statistic, similar to the the one described in an earlier question / answer: SELECT a.tree_id, a.species, avg(b.age) as age_avg, count(*) as samples, a.geom FROM trees a LEFT JOIN ...
0
votes
1answer
47 views

Algorithm for soil texture calculation

Ok. I have percent sand/silt/clay values for 30 sample points on grid. I used these values to create 3 interpolated IDW rasters. I want to somehow (I think in raster calculator) to make a code using ...
1
vote
2answers
47 views

Changing height/interpolation/shape of raster layer

I am kind of a beignner in ArcGIS and thought about and googled this problem for two days now. I am working in ArcScene making a 3D visualization of a bedrock surface of a town. I have a polygon ...
0
votes
1answer
24 views

How to do interpolation within geographic boundary in mapinfo?

I'm having two layers one is rain gauge data, another one is boundary I want to create rainfall distribution map within that geographic boundary in mapinfo can you say how to interpolate in ...
3
votes
3answers
171 views

Repeating steps based on different field using ModelBuilder?

I have built a model to interpolate air pollution from 40 recording stations using IDW. The results are then exported to an average for census divisions. I need to repeat this process hundreds ...
4
votes
0answers
37 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 ...
4
votes
3answers
107 views

Irregular XYZ point data to raster (TIF) - LASTools alternative?

I am trying to convert my irregular spaced point data (xyz) to a DEM and then, to a raster (geotiff). Because of the irregular spacing I need a triangulation first, right (so, no spaces are in the ...
2
votes
0answers
47 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 ...
5
votes
2answers
548 views

Kriging method to use for rainfall?

I am working on an rainfall analysis and I have to interpolate some datas with kriging method. Is co-kriging suitable for the rainfall analysis?
3
votes
1answer
3k views

interpolation methods in qgis

I have a points layer and I want to create an interpolation grid with QGIS 2.0. If I use Raster -> Analysis -> Interpolation the extent of the output raster is good (rectangular shape) but it ...
1
vote
1answer
39 views

How to interpolate only cells in a raster that are adjacent to existing cells with a value

I have raster data of a continuous field. I need to calculate zonal statistics on that data for some polygons (e.g polygons A and B in the image). It is essential that I have as complete as complete ...
0
votes
0answers
20 views

How can I use a spatial analysis tool (vector to raster) and keep date/time data?

I have a large point file of 18,000 points. These include amount of contaminants found in water samples from each point on different sample dates. For example the columns of pertinent data might ...
2
votes
1answer
313 views

Plotting map resulted from kriging in R

I want to plot a map weighted by prices. I got a data frame of latitudes, longitudes and prices: > str(data) 'data.frame': 1253 obs. of 3 variables: $ lon : num 11.2 11.1 11 11 11.3 ... $ ...