HOME PAGE Web Site Contents Mars Report Contents Mars Report Abstract CV for Dr. David Roffman Diplomas PhD Thesis PhD Thesis Powerpoint Mars PowerPoint MSL Weather Reports MSL Weather Fall Yr 3 MSL Yr. 3 Summer Weather MSL Yr. 3 Spring Weather MSL Ultraviolet Desai, EDL, Parachutes & ExoMars Mars winter vs. summer temps Sea at Utopia Planitia, Mars Tree Stump at MSL? Spherical life on Mars? Mars Report Abstract, 1-1.2 Mars Report Sec.2-2.1 Report 2.2-2.4 Report 2.5-2.5.2 Report 2.5.3-2.7 Report 3-4.1.2 Report 5 to 6 Report  7-7.2.1 Report 8-9 Report 10-11 Report  12-12.2 Report 12.3-12.5 Report 12.6 Report 13-14 Report 14.1 Report 14.2-14.3 Report 14.4-14.6.2 Report 14.6.3-14.6.4 Report 15-19 Report References Report Afterword Rebuttal of REMS Report Running water on Mars MSL Year 0 Weather MSL Yr 2 Winter-Spring Weather MSL Yr 2 Summer Weather MSL Yr 2 Fall Weather MSL Yr 2-3 Winter Weather Adiabatics MSL Hi Temps MSL Low Temps Organic Chem found by MSL Oxygen in Mars Air MSL Day length & Temp Warm winter ground temps 155-Mile High Mars Plume Radiation Diurnal Air Temp Variation Mars Temps Fahrenheit Beagle found JPL/NASA Pressure Mistakes Enter MarsCorrect Sol 370, 1160 & 1161 Histories Mars-Radio-Show JPL Fudges Pressure Curves MSL Temp. ∆ Mast to Ground High & Low Pressures Normalized Mars soil 2% water Moving rock Mars MAVEN MSL Relative Humidity Claim Ashima Concedes Original MSL Weather Record Old MSL Weather Record MSL Summer Weather Pressure Estimate REMS Wind MSL Pressures REMS Reports Curiosity Geology CERN-2013-pics Daylight Math MSL Errors P1 MSL Errors P2 MSL-Chute-Flap MSL daylight Ashima Sols 15 to 111 Ashima Sol 112 to 226 Ashima Sol 227 on New Ashima Sols 270+ MSL Summer to Sol 316 Updated Secrets of Mars Weather Forecast Wind Booms MSL Credibility MSL Temp. Swings MSL Temperatures Sample Analysis at Mars (SAM) VL2 - MSL Ls Comparson Ashima MIT Mars GCM Dust Storm Nonsense Mars Slideshow Moving Sand & Martian Wind 3 DEC12 Press Conf. MSL Press Conf. 15NOV2012 Sol Numbering MSL Pressure Graph to Ls 218.8 MSL Sky Color Mars Sky Color DATA DEBATE! Zubrin's Letter Phoenix Vaisala Vaisala Pressure Sensors Phoenix &MSL Flawed MSL REMS Viking pressure sensors failed MSL landing site Mars Landings Phobos Grunt Martian Air Supersaturation Mars & CH4 Mars and MSL Time Viking Pressure Audit Links Mars Society 2008 Quant Finance Frontiers Home Front. Preface Frontiers Ch. 1 Frontiers Ch. 2 Antimatter Lightning Frontiers Ch. 3 Frontiers Ch. 4 Frontiers Ch. 5 Frontiers Ch. 6 Frontiers Ch. 7 Frontiers Ch. 8 Frontiers Ch. 9 Frontiers Ch 10 Frontiers Ch 11 Frontiers Ch 12 Frontiers Ch 13 Frontiers Ch 14 Frontiers Ch 15 Frontiers Ch 16 Frontiers Ch 17 Frontiers Ch 18 Frontiers Ch 19 Frontiers Ch 20 Frontiers Ch 21 Frontiers Ch 22 World Tour Spring-Break -13 Other Travels Asteroid Impact? ExoMars data Unit Issues Viking Pressures Tavis CADs Landing Long Scale Heights LS of Max/Min Pressures Tavis Report Tavis Failures Lander Altitude Martian Trees? Code Experiment Gedanken Report Mars Nuke? Martian Flares Mach Numbers MOLA (altitude) Original Mars Report Mariner 9 & Pressure Mars  Temps MSL Time MPF Pressure Blog Debates Spring Pendulum Plasma Model Reporting Errors Orbital Parameters Anderson Localization P. 1 Anderson Localization P. 2 Moving rock old Navigating Mars Mars Report Section Links Mars Report Figure Link Gillespie Lake rock outcrop MSL Sol 200 Anomaly Sol 1300&1301 Anomalies Gilbert Levin & Labeled Release Brine on Mars Ceres Lights Yr 1 Table 1 amfivan Missing data Mitchell Report Old Mars Report All MPF Temps ExoMars fails Did Spirit find past life? MSL ground temps go haywire Seasonal Pressure Altitude Calculations


Weather app update

Posted on May 10, 2013 by chris

For the first 268 sols of data collected by REMS we’ve archived the XML data files published by CAB without any modifications. We also collected these files into a rems_climate  file that powers our mobile HTML5 app.

We’ve known about a few small flaws in the data stream for a while, including the lack of wind data, occasional copy-paste errors and changes in the language used for terrestrial dates (the files are manually updated). However, this is not the ‘science’ data (which can be found on NASA’s Planetary Data System) and this site is not maintained by/for the REMS science team. So, while we can guess at corrections to the data, we don’t add or create data without a very good reason.

Last month, spaceappschallange launched a project called “Wish You Were Here” to provide an “interesting representation of weather on Mars” using the REMS public feed. This led to most (if not all) of the participating groups to base their projects on our archived data feed and blame us for the errors they found. A few even tried to correct the data and added in new and interesting errors while doing so.

We can’t fix all of the data, but the data we release now contains a few extra values related to time on Mars that we calculate using our Python tools that we also use in our Data Assimilation project. The new data does not replace the old data, which still exists in the files, but we’ve added some fields to provide our best estimates of the timing data. Some of the projects formed in the  spaceappschallange have archived our dataset, so it might take them a while to update, but the data is live in our weather app right now!

In detail, we have:

1. Calculated the sunrise and sunset times at MSL in Mean and True Solar Times. These values are much better than the fixed values provided by the original data, but still rely on some assumptions. We assume that the mission Sol in question is referenced correctly in the original data and calculate the Mars Solar Date and J2000 ephemeris offset using this data. Once this date is found we (mathematically) look for the sunrise and sunset, noting the times it happens. Times are now given in a 24 hour clock format.

2. Calculated the Heliocentric Longitude, Ls. These calculated values rely on the same assumption about Sol number as the sunrise/sunset calculation. It turns out the original data is pretty close to our calculated values so we think the original data is correct. The difference between the two is in the origin of those values used to calculate Ls. Our Ls comes directly from the Sol number. The original CAB Ls may have a better source for this value in the raw data, or they may start from the “posted” Earth date.

3. Removed the wind speed and direction data.

4. Normalized the ‘posted’ or ‘terrestrial date’ to an ISO standard format. In our weather app (that has been running since MSL landed!) we present the date in a format determined by your Locale settings.

(As a reminder, neither the original nor calculated data provided by the app should be relied on for mission planning, weather forecasting, or conspiracy theories. NASA provides many free tools to find the time on Mars with extremely good accuracy if you need it.)



Well it took you long enough to remove the winds and to agree (within a minute or two) with our day length calculations. In fact, it took so long that we had asked Guy Webster to fire you guys (and, of course, the REMS Team who are the main source of your errors for these many, many, many months). By now we have filled the Internet with reports criticizing the hell out of Ashima, and, due to your retreat, we are in the process of updating it all with your new positions. What would have helped immensely to avoid all this would have been honest answers to our criticisms of your now admitted mistakes way back in September, 2012. We wrote in to your blog in good faith, and you deleted everything we had – thus greatly enhancing the conspiracy explanation for the junk you posted. In short, if you had displayed courteous manners back then we would not be where we are now in our relationship. One way to turn the relationship around is to acknowledge all the mistakes that the Roffman team brought to your attention and detailed on our DavidARoffman.Com site, rather than allude to nobody in particular who tracked your errors.