Tagged Questions

spatial interpolation is the procedure of estimating the value of properties at unsampled sites within the area covered by existing observations

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0answers
13 views

Optimized interpolation method with fixed-location sample data points?

I'm trying to find an optimized spatial interpolation method that deals with fixed-location sample data points. Say if I have fixed-location sampling sites and collect data daily, and then use these ...
3
votes
1answer
61 views

How to interpolate point set into value contours?

The task at hand is creating 'isobar' value contours that are interpolated from a point field of either the x/y or lat/lon type. I really have no idea where to begin mainly because this needs to be ...
4
votes
1answer
86 views

How to determine the optimal raster resolution when interpolating a surface from points?

I'm looking for guidance on how to determine the desired output resolution, when interpolating a surface from irregularly-spaced point samples. I have a series of boreholes taken across a city, and ...
6
votes
3answers
136 views

Interpolate data from multiple gpx tracks

I have a number of GPX tracks of the same road. But due to GPS error they are not accurate enough (20-30m off). I'm wondering if I could interpolate those multiple gpx tracks into single one. If an ...
5
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2answers
115 views

PostGIS - Interpolate point between contours

Using PostGIS, what is the best method to interpolate the z value for points (the orange dot in the image below) located between each contour layer (blue lines and red lines in the image below)? So ...
0
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0answers
38 views

Read esri shape point data and spline interpolation using python shell scripts?

I am quite new in python scripting. I am a dedicated user of arcgis but this time I have to work without arcgis. I have a point shapefile with 10 different attribute fields of different peat layer ...
3
votes
0answers
36 views

Spatial interpolation with breaklines in R

I have a dataset consisting of irregularly-spaced points (x,y,value) that represent an area of ocean that contains some land. I need to interpolate these to a regular grid, ensuring that the ...
1
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0answers
34 views

How to determine the distribution of pollutants using marine tissue samples?--3D Interpolation [closed]

I have point data representing tissue sampling performed by NOAA NCCOS for Gulf of Maine waters. I am assuming a temporal resolution of one sampling point per location for one year. I have searched ...
3
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0answers
52 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 ...
0
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1answer
24 views

My raster values are always changed to zero

I'm uploading a series of XYZ data points onto GIS and the co-ordinates are coming up fine, but some of the Z values are changed to zero - and in some cases, all! I've interpolated the majority of the ...
0
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1answer
51 views

Why do the range of values change when I export geostatistical layer to raster?

I did an interpolation of soil pH using 232 data points in geostatistical analyst with IDW, RBF and ordinary kriging. For all 3 methods, the range of pH values change (become smaller) after I export ...
0
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1answer
64 views

Iterative interpolation

I have an excel file with about data from 600 locations, each location having data for 1200 months(12 months* 100 years). I need to interpolate all point locations into rasters for each month of each ...
4
votes
1answer
94 views

Interpolate Temperature Using DEM

I want to "co-interpolate" temperature with DEM. I have SRTM 90m aggregated to 1km and I want to "co-interpolate" my DEM with points with temperature data. How do I do this? I am using ArcGIS 10.
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2answers
91 views

References to code IDW algorithm

Hi I'm new to interpolations. I'm looking for documentation to understand how inverse distance algorithm works and how to code it. My intention is to code IDW algorithm in JavaScript to see if it is ...
1
vote
0answers
55 views

Statistically compare two density maps?

I (will) have a modelled distribution and an observed distribution of animals. If I were to interpolate these position datasets to reflect some density distribution (perhaps using a kriging ...
4
votes
1answer
156 views

What are duck egg patterns in weighted moving average spatial interpolation method?

I'm dealing with spatial interpolation methods, in particular with the weighted moving average. I come across really oft with a term "duck egg patterns" which are caused by isolated data points. ...
0
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1answer
100 views

Difference spatial interpolation and trend surface analysis

What is the difference between spatial interpolation and trend surface analysis? For example, I read a scientific study that applied a neural network to estimate a surface solely based on the x and y ...
1
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0answers
64 views

Qgis raster interpolation shift

Using Qgis 2.0.1, I'm attempting to interpolate a large point dataset (n > 400K) to a raster surface. I'm using the IDW option in Raster>> Interpolation>> Interpolation, and the resulting ...
2
votes
1answer
639 views

How to pick the coefficient in Inverse Distance Weighted method?

I'm using QGIS 1.8.0 to interpolate weather data. This is, I have a weather station located in say, A and C. With the Inverted Distance Weighting or Triangular Interpolation methods, I can ...
1
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2answers
79 views

What ArcGIS interpolation tool would be most appropriate for price/square meter?

I have the price per square meter of around 13000 properties ; for the other 8000 of my shapefile the price is missing. The easiest option is to transfer the average price per square meter to the ...
7
votes
1answer
208 views

Spatial Interpolation - defining a minimum value for agroup of points

I am doing spatial interpolation with a group of points. Some points have complete observation of events: for a period of 24 hours we have observed N events in each point. These points have N ...