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Articles by Steven Mosher
A quick look at GHCN version 4
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 ...
Modis QC Bits
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
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
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
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.
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
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
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
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...]
In search of large ice floes
In search of large ice floes.
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A gWidgets GUI for climate data
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
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.
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Nick Stokes Distance code, now with Big Memory
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
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
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
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 !
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
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
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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