A technique for resampling raster data in which the value of each cell in an output raster is calculated using the value of the nearest cell in an input raster.

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154 views

Saving samples in eCognition

In eCognition developer is it possible to save samples that I have selected for nearest neighbor classification with the workspace or project? Every time I close and reopen my project I have to re ...
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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 ...
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255 views

N Nearest Neighbours efficiently PostGIS/Python

The data is worldwide about a million points, lat/lons, with an id and an importance value (0.0 to 1.0), and it's limited to being on land. Ideally I need to cluster all 1 million points into 100,000 ...
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Weighting Point Data whilst performing a Near analysis

I am struggling to work out how I can assign weights to my points (airports), So far I have carried out a Near fuction so that all of my raster (output areas ) are assigned a point with its distance ...
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393 views

Can Nearest Neighbor Analysis help determine values for a Heat Map?

Given the below parameters (from Nearest Neighbor Analysis): A) Is there a definite range my Radius value should be within? B) Are there definite values my cell size should be near? C) Is there a ...
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Coordinate System choice for Nearest Neighbor

Here's an interesting scenario I came upon yesterday and I wanted to throw it out as a question to try help me visualize what is happening. I have a single point (a person, say) who is looking for ...
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58 views

Why would Nearest Neighbor Analysis give 0 observed mean distance?

I am working with small datasets (around 100 points or less) with Nearest Neighbor Analysis in QGIS 2.8 (although I also tested in 2.6 and the result is the same). I have the layers referenced with a ...
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430 views

Loop though records in PostGIS (using PL/PYTHON or PGSQL)

I've seen many example of loops, but I can't get that one to work. I work for a regional transit agency and each year, we conduct several surveys. I geocode everything to the house level for internal ...
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Grid resolution and distance upper bound in nearest neighbor

I wrote a routine to interpolate values of GRIB files (coming with several grid types like regular, reduced and rotated) to a target grid, using scipy KDTree to find indexes and distances. Since ...
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93 views

how to use spatial index in spatialite query

I posted this question originally nearest neighbor query in SpatiaLite. Thanks to the answer given I was able to get the query working on some test data. However I am having trouble applying a spatial ...
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High-performance k-nearest neighbor MBRs from given point using spatialite?

I've built an 2-dimensional spatialite db with millions of polygons inside. What I want to do is to find the polygon which is the nearest from given (x,y) coordinate. This is what I want to do. ...