The estimation of values at unsampled points based on known values of surrounding points.
26
votes
7answers
5k views
Open source methods for kriging?
I have a point dataset which I'd like to Krige, ideally using an open-source software package. If possible, I'd also like to choose the semi-variogram model during the process to improve the ...
12
votes
1answer
617 views
What resampling technique should be used when projecting aerial photos?
I'm doing some time-intensive projecting of aerial photos, and I'm curious - what resampling technique is best to use on aerial photos? In ArcMap, my options are NEAREST, BILINEAR, CUBIC, and ...
12
votes
2answers
1k views
How to smooth/interpolate a raster in python using GDAL?
This is my first post so please feel free to critique where necessary.
Background:
I am developing in Python and using GDAL from OSGEO to manipulate and interact with rasters and shapefiles.
...
11
votes
4answers
8k views
How do you decide what interpolation method to use for resampling raster data?
The question pretty much says it all; are there hard and fast rules about which interpolation methods are suited to each kind of raster data? Any Golden rules, rules of thumb? Good books or articles ...
11
votes
3answers
404 views
Modelling of rent prices - which interpolation method should I choose?
I have national dataset of ~1,4 million households. There I have information about rent, size (number of rooms and m2) and some additional characteristics of each household.
I'd like to use this data ...
11
votes
6answers
1k views
Looking for interpolation tool to produce river bathymetry (topography) from sections
As per the title, I am looking for a tool that can produce bathymetry of a river from cross sections. Although people who may know such tools probably will not need any explanation why this kind of ...
11
votes
1answer
905 views
How do you use GRASS's v.kernel?
I am flummoxed on how to use GRASS's v.kernel.
I have a vector layer of around 2.5 million points. I want to make a heat map using v.kernel to show concentrations, since I have variable instances ...
11
votes
3answers
234 views
PostGIS interpolation / triangulation options
I'm looking for an open source workflow to automate DEM construction. We have a series of sites that fall within a LIDAR dataset. We want to create site specific DEM's for each site, and we're ...
10
votes
1answer
372 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 ...
10
votes
5answers
334 views
What is the best technique for interpolating soil depth from sample points
This is my first post here.
I have some points from a soil depth survey and I need to interpolate the depth for a whole area. What is the most appropriate technique for this and is there anything I ...
10
votes
3answers
848 views
How to interpolate GPS Positions in PostGIS
I have a PostGIS table of GPS positions for every five seconds:
2011-01-01 00:00:05, POINT(x1,y1)
2011-01-01 00:00:10, POINT(x2,y2)
2011-01-01 00:00:15, POINT(x3,y3)
...
I'm looking for a query ...
9
votes
3answers
987 views
Interpolation for timeseries in ArcGIS
I'm trying to calculate average rainfall value from a number of points using Inverse Weighted Distance tool in ArcGIS 9.3.
My problem is that: each point has it own time series, therefore the ...
9
votes
4answers
1k views
Is there a way to krige with barriers in ArcGIS 10?
I am trying to do interpolation in a coastal area with data points in several rivers emptying into a bay and on opposite sides of peninsulas. I have created a coastline layer to use it as a barrier ...
8
votes
3answers
3k views
Bilinear interpolation of point data on a raster in Python?
I have a raster that I'd like to do some point interpolations with. Here is where I'm at:
from osgeo import gdal
from numpy import array
# Read raster
source = gdal.Open('my_raster.tif')
nx, ny = ...
7
votes
6answers
623 views
Shortest Path using interpolated OSM points
I have a set of GPS points which I have snapped to the OSM network. In the below screenshot GPS points are red, snapped points are green.
I want to calculate the shortest path that includes all of ...
7
votes
4answers
1k 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" ...
7
votes
5answers
1k views
What type of interpolation should I use to visualize metal detection survey data?
I have about 500,000 points collected in a linear grid pattern over a 1 km2 area. The points were collected as part of a metal detection survey. Each point has X,Y and Coil Response mV (min -675.38 ...
7
votes
2answers
1k views
How to Create Contours for Zonation
I'm still new in the world of GIS.
I'm currently doing some zonation with "test points." Each has its own coordinates and "P" value. I want to make contours of these data, to divide the whole area ...
7
votes
1answer
538 views
Partially update a raster (a DEM)
My todays question is: How to update an .img DEM in ArcView 9.3?
I do have DEM which need to be updated only if few parts. The area to be updated has been produced in separate DEM with Spline ...
7
votes
2answers
173 views
How to handle interpolation of multiple (quality) tiers of irregular data?
I'm going to try to provide a high level overview of the issue - realizing that more details/info will be necessary - but I don't want to write a novel that seems too overwhelming for people to ...
7
votes
1answer
335 views
How to grid unevenly sampled categorical data?
I am looking for a method for gridding categorical data. I have extracted from nautical charts and field sheets a collection of points specifying the nature of the surface of the bottom of the ocean. ...
6
votes
2answers
731 views
Creating geodatabase from CSV using python
I have a file with weather data (daily) for multiple weather stations for multiple years. I am looking for some python script to automate the database creation process and its interpolation on a daily ...
6
votes
4answers
633 views
Interpolation of Three Data Points
I have three location point: weather points.
It's a 10-year composite of temperature values which means I only have three values for three locations for ten years.
I want to interpolate these points ...
6
votes
2answers
84 views
IDW spatial interpolation: appropriate projection?
I am wondering if anyone can clarify whether point data should be projected to an equidistant projection when using ArcGIS IDW spatial interpolation?
I am working on a dataset from Western North ...
5
votes
2answers
271 views
Optimum grid/pixel size for interpolating rainfall and temperature
I have a set monthly rainfall and temperature data within an approximately 100 x 100 km study area. The sampling points are unevenly distributed within the study area. Based on a paper by Janis et. ...
5
votes
1answer
227 views
Change the image size in ARCGIS
I did interpolation operation on temperature and precipitation data. Output image size is 3300 (col) and 2550 (row). I have some NDVI images with size of 15456 (col) and 5074 (row). Generally, I want ...
5
votes
1answer
444 views
How to choose raster interpolation method?
I work with a dataset of ~1.3 million residential buildings; each of them is described by a normally distributed variable ranging from 0 to 100. The dataset covers whole Switzerland so there are ...
5
votes
3answers
675 views
How to interpolate into polygons?
I need to interpolate values from points to polygons.
I have a point shapefile and a shapefile of adjacent polygons. Some polygons get several points falling inside, some have nothing.
I thought ...
5
votes
2answers
145 views
Spatial Analysis with Factors/Classifications
When doing analysis on spatial data with associated information that is numeric, it is possible to use techniques such as Kriging or Interpolation or Cluster Analysis to find out interesting ...
5
votes
2answers
400 views
How to interpolate while providing clipping geometry? (ArcGIS 10)
Is there a way to interpolate (IDW) while providing clipping geometry? My objective is that I want to interpolate temperature data but I do not want it to interpolate the entire extent of the point ...
5
votes
1answer
128 views
ModelBuilder: How to extract data by date, export to separate tables and interpolate tables to rasters
I've been using ArcGIS for a couple years, but when it comes to model builder I've only worked with very simple models. I'm hoping someone that is much smarter than myself can help me in building a ...
5
votes
2answers
325 views
Spatio-temporal block kriging with R package gstat?
In the documentation of sp I saw that the coords argument of the SpatialPolygons function only accepts 2 columns. Is it not possible to create 3-dimensional polygons? I am doing spatio-temporal ...
5
votes
1answer
432 views
Are special interpolation techniques required for weather data?
I've downloaded a series of weather observations from the local weather agency - it comprises around 1,000 points spread non-uniformly across Australia, with a greater density of points located near ...
4
votes
1answer
204 views
Interpolation of Values in ArcGIS
I wanted to interpolate the trend values (trend of sunshine hour calculated over 20 years) throughout the study area from the available station points. My confusion is in the selection of ...
4
votes
2answers
403 views
ArcGIS, Calibrating routes, interpolation error
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 ...
4
votes
2answers
2k views
Correct way to create a DEM from point data in csv files
I know this might seem a somewhat general question, but I have to start somewhere.
I have a lot of csv files which contain point data containing height, aspect and slope measurements at a resolution ...
4
votes
4answers
250 views
TIN interpolation crash in Qgis
I have problems using the function TIN(linear) interpolation in Qgis. The program crashes when larger areas is interpolated.
Map properties:
vector map,
Geometry typ = Point,
features in this ...
4
votes
1answer
679 views
Point interpolation in route
I have a set of GPS coords with X,Y and Course. I need to interpolate additional points based on the course of each point. It would be a simple line intersection based on lines drawn using the 2 ...
4
votes
1answer
151 views
Is it possible to do spatial interpolation using points in a field?
I would like to use Quantum instead of ArcGIS to make field map but before, I need to know if its possible to do spatial interpolation with definited points in a field (ex. pH points). Is there a ...
4
votes
1answer
152 views
How to interpolate polyline or line from points?
We have a lot of points, but with no timestamps to create ways. For now, I've created a sample of the way the points traverse. It's in here, this way can be compared with a Google one.
I haven't ...
4
votes
2answers
140 views
3D modelling a snow patch
In my studies, I work with the internal dynamics of different snowpatches. In this study I wish to generate 3D models of snow patches. I have some problems when it comes to the actual work flow of ...
4
votes
1answer
323 views
Which interpolation method is the most suitable for DEMs?
Which interpolation method is the best suitable for hill/valley areas and normal ground with undulations and rivers? When working with Aster 30mX30m DEMs, which method will give the most realistic ...
4
votes
0answers
41 views
ArcGis Raster Resampling Question [duplicate]
Possible Duplicate:
How do you decide what interpolation method to use for resampling raster data?
I want to interpolate a certiain target variable over a large territory. I trained a ...
3
votes
1answer
429 views
Interpolate undulations for given points using a geoid model
I have two databases, the first one (F.tsj) contains gps points: coordinates and ellipsoid heights and the second one is simply a geoid model where every line stores latitude, longitude, and ...
3
votes
1answer
134 views
3
votes
2answers
441 views
Interpolating and infilling a raster from 5km pixels to 100m pixels in Arcmap 10
I am trying to refine a raster dataset of annual rainfall from a 5km grid down to a 100m grid. Before I continue, I am aware that this could result in some uncertainty regarding the data. However, the ...
3
votes
3answers
523 views
How to use NASS county level crop data to estimate crop acreage in hydrologic regions?
National Agriculture Statistics Service (NASS) provides county level crop (Corn, Soybean, Sorghum, etc) data. I want to calculate crop acres on each subwatershed from the county based data. What is ...
3
votes
1answer
185 views
Interpolating Maps - Statistical Learning Techniques vs Spatial Statistics Techniques
I have recently begun experimenting with the inteprolation of variales over a whole country.
I have good sized training set where I have several dependant variables (continuous and categorical) ...
3
votes
1answer
108 views
How can I select which interpolation technique will be used in a gdal command? (gdal_fillnodata.py)
I work on Landsat 7 slc-off images and I would like to use the gdal_fillnodata.py command to fill-in the missing pixels. The problem that I have is that the gdal_fillnodata.py uses the "inverse ...
3
votes
1answer
144 views
How to calculate maximum distance to an interpolated value along a contour in QGIS?
I'm planning to enter concentrations of groundwater contaminants collected from well locations into QGIS and then use interpolation functions to create contours of the groundwater plume. Can QGIS ...
