Articles by Steven Mosher

Resources

October 11, 2020 | Steven Mosher

bakerDownload blackburnDownload ellis1890Download karl86Download mitchellDownload schall-77Download christyDownload mmtsDownload Download [Read more...]

A quick look at GHCN version 4

November 2, 2018 | Steven Mosher

GHCN  version 4   beta is available.  Using the GHS  population dataset the ~27000  GHCNV4 sites were filtered  to collect only rural stations.   GHS  combines two datasets,  a  10meter  built surface  satellite dataset and a human population dataset.   https://ghsl.jrc.ec.europa.eu/.    using site locations the population within 10km  of the ...
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Modis QC Bits

December 5, 2012 | Steven Mosher

In the course of working through my MODIS  LST project and reviewing the steps that Imhoff and Zhang took as well has the data preparations other researchers have taken ( Neteler ) the issue of MODIS Quality control bits came up.  Every MODIS  HDF file comes with multiple SDS or multiple layers ... [Read more...]

Modis R: Package tutorial

November 24, 2012 | Steven Mosher

The MODIS package for R For people who work in GIS in R there has been a bit of challenge in working with data from  Modis. I’ll use an example from my own work on UHI to illustrate. A while back I decided that I wanted to look at ... [Read more...]

Terrain effects on SUHI estimates

November 9, 2012 | Steven Mosher

Introduction Zhang and Imhoff (2010)  pdf here utilized NLCD impervious surface area (ISA), Olson biomes, and MODIS Land Surface temperature (LST) to estimate the magnitude of UHI in large cities across the US.  Peng  employed a   similar approach in studying 419 large cities ( population greater than 1m ) around world. Peng’s work ... [Read more...]

Pilot Study: Small Town Land Surface Temperature

October 11, 2012 | Steven Mosher

Introduction Zhang and Imhoff (2010)  pdf here utilized NLCD impervious surface area (ISA), Olson biomes, and MODIS Land Surface temperature (LST) to estimate the magnitude of UHI in large cities across the US.  Peng  employed a   similar approach in studying 419 large cities ( population greater than 1m ) around world. Peng’s work ... [Read more...]

Sample Input Data.

October 7, 2012 | Steven Mosher

Just a couple quick examples. Starting with   30 meter impervious surface Followed by MODIS Land cover  ( “red” is urban ) And finally Day  LST   Google earth [Read more...]

More Fun With Modis

October 7, 2012 | Steven Mosher

I’ve started a tutorial on using the MODIS package in R the first few steps are here.  While I wait on a release of the package I thought I would play around a bit with the MRT tool and see how it worked.  Let’s recall where we are ... [Read more...]

City Size and SUHI

October 2, 2012 | Steven Mosher

In the course of putting together data for my kriging project with the CRN stations, I got another idea related to a small but potentially important corner of the concerns over UHI in the global temperature index. For clarity I suppose I should make it clear that my position is ... [Read more...]

rasterVis to the rescue

September 26, 2012 | Steven Mosher

Programmers like Oscar Perpiñán Lamigueiro are the reason I love R!  Oscar is the maintainer of the rasterVis package and it in this post I’ll explain why it is must have package for anyone working with the raster package in R.  My latest project is focused on the ... [Read more...]

A gWidgets GUI for climate data

July 9, 2012 | Steven Mosher

If you haven’t worked with the gWidgets package it’s worth some time exploring it which is what I’ve been doing for a little paleo project I’ve been working on. After struggling with the few demos and tutorials I could find I went ahead and bought the ... [Read more...]

Updates to Old code

June 22, 2012 | Steven Mosher

I notice from time to time that people download code from the drop box. The drop box lags  CRAN.  I’ve upload the newest versions to the drop box. In the future I will post new releases to the drop box before I submit to CRAN. [Read more...]

Nick Stokes Distance code, now with Big Memory

April 12, 2012 | Steven Mosher

In my last post I was struggling with getting a big memory version of the distance matrix to work fast. Nick and other readers had some suggestions and after puttering around with Nicks code I’ve adapted it to big memory and not impacted the run time very much. For ... [Read more...]

Using bigmemory for a distance matrix

April 7, 2012 | Steven Mosher

The process of working on metadata and temperature series gives rise to several situations where I need to calculate the distance from every station to every other station. With a small number of stations this can be done easily on the fly with the result stored in a matrix. The ... [Read more...]

Metadata Dubuque and UHI

March 21, 2012 | Steven Mosher

I’m in the process of remaking all the metadata from scratch and looking once again at the question of UHI. There are not any global conclusions we can draw from the data yet; I’m just in the process of checking out everything that is available that could be ... [Read more...]

Cooling Stations

March 17, 2012 | Steven Mosher

Over the course of the past few years I have taking a look at cooling stations a few times but never in much depth. A few other people have looked at them, but usually without much rigor. The standard approach is to find some cooling stations and then conclude that ... [Read more...]

More Anthromes !

March 13, 2012 | Steven Mosher

First off let me thank folks for all the comments and suggestions. I’m just starting to explore this data so perhaps I should explain how I go about  doing this. First off, I am looking for a global bias in the record from UHI. It is well known that ... [Read more...]

Anthromes and UHI

March 12, 2012 | Steven Mosher

With BerkeleyEarth 1.6 posted to CRAN I figured it was time to do some sample programs to explain how the package worked and integrated with other packages. Also, I have some issues to check out with the metadata; and in the long run I want to reformulate my metadata package to ... [Read more...]

BerkeleyEarth Version 1.6

March 5, 2012 | Steven Mosher

Version 1.6 has just been submitted to CRAN and I will post the source here in the dropbox. Version 1.6 will probably be stable for a long time unless I find a bug. The main additions I made were adding a few functions to make some things easier, and I converted two ... [Read more...]
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