quakemap is released under GPL version 2 or later. See the
header comments in quakemaps.cs and the file COPYING.
When I was first learning C# (for Windows Phone 7 development while working at Nokia), I developed this program, "quakemap", as an exercise. It reads map and earthquake data, either from local files or from a web site, and generates a png image file plotting the locations of recent quakes. Parameters are specified by command-line options.
Nokia was kind enough to let me retain ownership of the code after I left.
I did most of the development using Mono on my Ubuntu system at home, but it also builds and runs under Windows using Microsoft Visual Studio. My original intent was to port the code to the Windows Phone platform, but several of the required libraries were unavailable.
This was a learning exercise. I make no claims that this program is a model of good C# style, or that it's as efficient as it could be. For example, all the plotting (lat/lon lines, shores, quake data) is done one pixel at a time.
The generated image uses:
- Color to denote the time of the quake (red is recent, blue is 3.5 days ago, green is 7 days ago, with continuous shading for intermediate ages)
- A black vertical line to denote the depth
- The size of the circle to denote magnitude
I've included no-rivers.txt in this project; it's suitable as an
argument to the -shoredata option (see below). Warning: This file
is about 67 megabytes of plain text, about 3.2 million lines (each
line represents a point on the Earth's surface).
By default, it will read shore data from shores.txt and quake
data from eqs7day-M1.txt, and write the image to quakes.png,
all in the current directory. If eqs7day-M1.txt is not
available, it will read the data from a file on the USGS web
site.
The file quakes-sample.png is a sample image file generated by the program,
with the following arguments:
./quakemap.exe -width 4096 -rotation 117 -shore no-rivers.txt
It was generated at Sun 2012-11-04 22:20 UTC. The -rotation 117
argument centers the map on the longitude of San Diego, 117° West.
The file quakes-big.png is a very large (50 megapixels, 2.5 megabytes)
image showing all recorded quakes over a period of about 19 months,
from 2011-03-25 to 2012-11-09.
To compile under Ubuntu, you'll need to install the mono-gmcs package:
sudo apt-get install mono-gmcs
Then run this command:
gmcs -r:System.Drawing.dll quakemap.cs
This generates quakemap.exe, which can be executed.
quakemap.exe -help shows the following usage message:
quakemap running in /home/kst/git/quakemap
Usage: quakemape.exe [options]
-help Show this message and exit
-width num Width of generated map, default is 4096
Sets height to width/2
-height num Height of generated map, default is 2048
Sets width to height*2
-rotation num Rotate num degrees
-mercator Use a Mercator projection
-fade Older earthquakes fade to white
-gray Show quakes in gray (overrides -fade)
-quakedata name Filename or URL of quake data file
May be repeated; first available name is used
Default list is:
eqs7day-M1.txt
http://earthquake.usgs.gov/earthquakes/catalogs/eqs7day-M1.txt
-shoredata name Filename or URL of shore data file
Default list is:
shores.txt
-imagefile name Name of generated image file, should be *.png
Default list is:
quakes.png
(Some of the defaults are specific to the locations of files on my own current or former systems.)
-- Keith Thompson Keith.S.Thompson@gmail.com Mon 2012-11-12