Open Source GIS and Mapping Ideas

PostGIS Quickie

November 10, 2011 | dylan

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...]

Soil Series Query for SoilWeb

September 16, 2011 | dylan

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...]

Soil Properties Visualized on a 1km Grid

August 31, 2010 | dylan

Fresno Area Urban Areas vs Irrigated LCC: grey regions are current urban areas A couple of maps generated from a 1km gridded soil property database, derived from SSURGO data where available with holes filled with STATSGO data. Soil properties visualize... [Read more...]

GRASS Can Make Pretty Maps

August 23, 2010 | dylan

I have posted a couple examples in the past on the topic of high quality map production from GRASS GIS-- usually via the Generic Mapping Tools. I am not sure why, but I have previously avoided using the traditional cartographic output module that is bu... [Read more...]

Getting Parent Material Data out of SSURGO

May 27, 2010 | dylan

  Parent material data is stored within the copm and copmgrp tables. The copm table can be linked to the copmgrp table via the 'copmgrpkey' field, and the copmgrp table can be linked to the component table via the 'cokey' field. The following queries illustrate these table relationships, and show one ... [Read more...]

SoilWeb iPhone App: Beta-Testers?

February 23, 2010 | dylan

iPhone App Screenshot rev 0.2 - icon iphone App Screenshot rev 0.2 - in Fresno   More Updates: The application is now available on the Apple iTunes Store. Preliminary documentaion here. read more
[Read more...]

Visual Interpretation of Principal Coordinates (of) Neighbor Matrices (PCNM)

February 21, 2010 | dylan

Principal Coordinates (of) Neighbor Matrices (PCNM) is an interesting algorithm, developed by P. Borcard and P. Legendre at the University of Montreal, for the multi-scale analysis of spatial structure. This algorithm is typically applied to a distance matrix, computed from the coordinates where some environmental data were collected. The resulting "... [Read more...]

Two New Soils-Related KMZ Demos

February 10, 2010 | dylan

LCC KMZ Soil Texture KMZ   Forgot to post these KMZ files: 1-km scale, aggregate LCC and soil texture data, derived from SSURGO. These are part of a series of KMZ / raster datasets that will be published soon. See attached files at the bottom of the page. Enjoy! read more
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Interesting use of levelplot() for time series data

January 16, 2010 | dylan

levelplot example: soil temperature (left) and moisture (right) Several recent articles appeared on the R-bloggers feed aggregator that demonstrated an interesting visualization of time series data using color. This style of visualization was readily adapted for the time series data I regularly collect (soil moisture and temperature), and quickly implemented ...
[Read more...]

Estimated Net Worth of SoilWeb- Our Online Soil Survey

December 28, 2009 | dylan

According to the excellent source code evaluation tool, SLOCCount, our online soil survey (SoilWeb) code is worth about $268,543 and would require about 2 years of development time to re-create from scratch with a single developer working full-time. This is a fairly close estimate, as I have been working (part-time) on this ... [Read more...]
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