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Measuring data values at specific, discrete locations.
123 questions
57
votes
5
answers
18k
views
What are the benefits of hexagonal sampling polygons?
I am always on the lookout for useful methods to sample or partition study areas (usually in the form of raster datasets) into smaller units. Recently, I read an ESRI blog post about a new tool for ...
- 52k
27
votes
2
answers
12k
views
How much sense does it make to average (lat,lon) samples in order to increase 2D accuracy of a GPS location?
Several GPS applications, like this one, or this one, acquire multiple (lat,lon) samples of a given location, assuming that the GPS unit is not moving, and then take an average of the samples in order ...
- 425
19
votes
2
answers
14k
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 ...
- 1,821
12
votes
1
answer
6k
views
What is the difference between sample, sampleRegions, and stratifiedSample in Google Earth Engine?
According to the documentation of GEE
ee.Image.sample() samples the pixels of an image and returns them as a FeatureCollection, in which each feature has 1 property per band in the input image. You ...
- 1,196
11
votes
3
answers
9k
views
Randomly sample from geopandas DataFrame in Python
I am reading a shapefile as geopandas DataFrame and them using pandas subset method to select a region.
geodata = gpd.read_file(bayshp)
geodata.dtypes
geodata.head(10)
OBJECTID FIPSSTCO ...
- 513
9
votes
3
answers
6k
views
Using sampleRandom() from large raster without NA values in R?
I have a number of vary large rasters which need to be randomly sampled with the return value being a matrix of x, y, and value. The raster package sampleRandom(raster,n, na.rm=TRUE, xy=TRUE) will do ...
- 471
8
votes
1
answer
582
views
How does Empirical Bayesian Kriging of ArcGIS Pro handle sampling bias?
In ArcGIS Pro, simple kriging approaches allow you to de-cluster your data before applying a normal-score transformation. According to the Esri guideline, normal-score transformations are only ...
- 201
8
votes
1
answer
199
views
Estimation of values for unsampled points
I want to measure biomass on a coastal mudflat. I can only access points inside the polygon. Are there any methods available that would allow me to estimate values of the points outside of the polygon,...
- 1,157
7
votes
3
answers
11k
views
Extract Overlapping Polygon Data to Points
I have a polygon data set of corn yield collected by a combine. However, as the combine drove through the field, there was slight overlap between passes, leading to overlapping polygons within the ...
- 387
7
votes
1
answer
4k
views
What sampling tools are available in QGIS?
I'm looking for a tool to generate a stratified random set of points within the boundaries of a polygon layer.
In ftools 0.6.1 there is a tool which almost does what I need, but misses the stratified ...
- 5,644
5
votes
1
answer
1k
views
Plugin not available : point sampling tool
I installed the QGIS Standalone Installer Version 2.14 (64bit). I created a map in the program called QGIS Desktop 2.14.3 with GRASS 7.0.4.
I need one tool from Plugin : Point sampling tool. The ...
- 375
5
votes
1
answer
7k
views
Is there a source for free CSV files with geo data and other desired fields? [closed]
I'm writing some software components that process geospatial data. The input data is a CSV with general columns (e.g. name) and geo columns (e.g. city, lat or zip). I would like to test these ...
- 6,916
4
votes
3
answers
383
views
Point attribute from underlying raster data TIFFTAG
I have a layer of manually set points in qgis that have the following attributes at the moment :
id, lat, long
Additionally, I have a number of different overlapping raster images (sattelite data) ...
- 93
4
votes
1
answer
259
views
Risk of generating sampling points from Pseudo-Mercator projection
Is there any risk in using the Pseudo Mercator projection (EPSG:3857) to generate lat/long coordinates for locating sampling plots with a handheld GPS?
My understanding is that since it uses WGS-84 ...
- 1,317
4
votes
1
answer
2k
views
Generate random points within a polygon with minimum distances in QGIS 2.14
I have a polygon in QGIS 2.14 and want to generate a specified number of coordinate points within that polygon, with a minimum distance apart. The fTools Random Points tool doesn't give this option, ...
