Blog Archives

AQP Demo: Interfacing with PedonPC Databases using the ‘soilDB’ Package

January 12, 2012
By

Here is a quick, draft demo on extracting soils data from a PedonPC database, and performing some common analysis with functions from AQP. The newly released soilDB package makes it possible to rapidly extract soils data from PedonPC, local NASIS, and ...

Read more »

A Quick Demo of SoilProfileCollection Methods and Plotting Functions

January 4, 2012
By
A Quick Demo of SoilProfileCollection Methods and Plotting Functions

Here is a quick demo of some of the new functionality in AQP as of version 0.99-9.2. The demos below are based on soil profiles from an archive described in (Carre and Girard, 2002) available on the OSACA page. A condensed version of the collection is ...

Read more »

AQP 0.9-9 is ready: 1.0 should be out by 2012-01-01 !

December 22, 2011
By
AQP 0.9-9 is ready: 1.0 should be out by 2012-01-01 !

Version 1.0 of AQP is nearly ready-- after nearly 3 years of development, 2 years on R-Forge, and 1+ year on CRAN. Just pushed version 0.9-9 to R-Forge, and it should be on CRAN within a couple days. Recent changes are listed below, clipped from the NE...

Read more »

Logistic Power Peak (LPP) Simulated Soil Profiles

November 12, 2011
By
Logistic Power Peak (LPP) Simulated Soil Profiles

A friend of mine recently published a very interesting article on the pedologic interpretation of asymetric peak functions fit to soil profile data (Myers et al., 2011). I won't bother summarizing or paraphrasing the article here, as the original artic...

Read more »

PostGIS Quickie

November 10, 2011
By

Today I needed to cut out a rectangle of geologic data from a state-wide map in an AEA coordinate system, using a bounding box from a UTM zone 10 region, with the output saved in UTM zone 10 coordinates. PostGIS makes this type of operation very simple...

Read more »

Combining Base+Grid Graphics

October 4, 2011
By
Combining Base+Grid Graphics

R provides several frameworks for composing figures. Base graphics is the simplest, grid is more advanced, and the lattice/ggplot packages provide convenient abstractions of the grid graphics system. Multi-element figures can be readily created in base...

Read more »

Soil-Landscape Block Diagrams in SoilWeb

September 16, 2011
By
Soil-Landscape Block Diagrams in SoilWeb

Users of our Google Earth interface to USDA-NCSS soils information will now see links to soil-landscape block diagrams listed within map unit descriptions. Automated Linking to NCSS Block Diagrams read more

Read more »

Soil Series Query for SoilWeb

September 16, 2011
By
Soil Series Query for SoilWeb

A map depicting the spatial distribution of a given soil series can be very useful when working on a new soil survey, updating an old one, or searching for specific soil characteristics. We have recently added a soil series query facility to SoilWeb, w...

Read more »

Recent Updates in the aqp (Algorithms for Quantitative Pedology) Package for R

September 14, 2011
By

New version of our 'aqp' package for quantitative soils investigations, available on CRAN (version 0.99-5) and R-Forge (0.99-8). Some of the major changes are listed below: -------------------------- aqp 0.99-8 (2011-09-14) -------------------------- ...

Read more »

Saving Chunks of SSURGO Data in SoilWeb for Google Earth

June 28, 2011
By
Saving Chunks of SSURGO Data in SoilWeb for Google Earth

SoilWeb is an interactive, multifaceted interface to USDA-NCSS soil survey information. Our SoilWeb application for Google Earth streams soil map units and point data as you navigate across the lower '48 states. Currently, our system imposes a 30,000 ...

Read more »