Robbi Bishop-Taylor

6 Questions 14 Answers 0 Followers

Questions related from Robbi Bishop-Taylor

How to calculate least-cost distances between polygons (not points) in R or Python?

I have a large set of habitat polygons (over 10,000) between which I wish to calculate least-cost distances and cumulative costs for a subset of polygon pairs (nearest edge to nearest edge), using...

04 April 2015 6,985 7 View

How can I calculate RUSLE K-factor (erodibility) factor without soil structure information?

I'm currently running an erosion model using the Revised Universal Soil Loss Equation (RUSLE), and have access to a dataset which only includes information on soil texture (% clay, silt, fine sand...

01 January 2015 1,697 23 View

R package for using circuit theory to model ecological patch connectivity?

I am currently looking into circuit theory resistance modelling (http://goo.gl/fPOSVw) as an alternative to least-cost path approaches for modelling ecological connectivity throughout a major...

03 March 2014 6,828 6 View

Interpolating/mapping categorical soil texture data

I wish to produce a range of soil maps for a dataset, ideally focused on the distribution of soil sand, silt and clay within a study area. Unfortunately, the dataset at my disposal was produced...

04 April 2013 7,841 9 View

Assessing if a sample exhibits preferences for certain values of a variable vs. natural distribution?

Scenario: I have two datasets. The first is a sample dataset of "observed" values of a spatial variable (eg elevation) extracted for n=30 sites being studied. The second is an "expected" dataset...

04 April 2013 4,273 12 View

Interpolating compositional data (i.e. soil particle size fraction)?

Ordinary kriging and other common interpolation measures are clearly inappropriate for use on compositional data which sum to a constant (such as soil particle size fraction data - % sand, silt...

03 March 2013 5,279 25 View