The estimation of values at unsampled points based on known values of surrounding points.
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
1answer
908 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 ...
3
votes
3answers
526 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 ...
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 ...
10
votes
3answers
854 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 ...
6
votes
2answers
736 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 ...
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
6answers
624 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 ...
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
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 ...
12
votes
1answer
622 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 ...
7
votes
1answer
541 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 ...
4
votes
1answer
215 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 ...
2
votes
1answer
637 views
TIN Interpolation using a vector layer
I'm writing a plugin in QGIS and I'd like to generate a TIN surface using a vector layer with x,y and z (interpolation attribute).
The idea is to visualize the same result like in the Interpolation ...
1
vote
1answer
343 views
How to use buffers to estimate the attribute data for a given polygon?
I have two layers: point and a polygon.
The point layer has lat/long and I have created buffers of a 1/4 mile.
The polygon layer has data such as age and income.
Is there a plug-in that can ...
1
vote
2answers
287 views
ArcGIS API Interpolation Functions
Does ArcGIS API provide interpolation functions, like if I want to interpolate from my own set of values?
Edit:
I know that ArcGIS provides functions for interpolation like IDW, Spline and Kriging ...
0
votes
0answers
42 views
Displaying Interpolated surface [duplicate]
Possible Duplicate:
Displaying/Accessing interpolated data
I successfully carried out IDW interpolation procedure on rainfall data, using the spatial extent, same pixel size, and same pixel ...
