- Catfood Earth Themes
- Catfood Earth Layers
- Catfood Earth Advanced
- Catfood Earth for Android
- Installation and Support for Catfood Earth
Catfood Earth uses satellite imagery and data feeds to create live wallpaper for Windows and Android. Earth shows you the current extent of day and night combined with global cloud cover (clouds updated every hour). You can also choose to display time zones, places, earthquakes, volcanoes and weather radar. The Windows version includes a screen saver. Catfood Earth was first released in 2003. Version 4 was fully remastered to support 4K resolution on both platforms.
Catfood Earth Themes
Catfood Earth can be quickly configured with three different themes. After installing, run Catfood Earth Settings and click one of the buttons to activate a theme. If you want to customize further then visit the layers and advanced tabs of the settings app, described in detail below. The themes are:
Natural is the default theme. This combines day, night and cloud cover. The day image uses NASA's blue marble next generation monthly global composite. combined daily so you can see changes in snow, ice and even vegetation throughout the year. Next, global cloud cover is blended on top of the day image (updated hourly). Finally Catfood Earth computes the extent of day and night and blends in NASA's city lights image. You can update the image as frequently as every minute and watch the terminator between day and night move across the planet and change shape with the passing seasons. The video below shows how all three components of the natural theme change over the course of a year:
Time Zones Theme
The time zones theme shows the current time zone in each country and optionally international zones as well. This theme is highly configurable, you can choose to show borders, pick colors, show hours or hours and minutes and control transparency. Catfood Earth can also show the local time for anywhere on Earth, see the places layer for more details. The video below shows how the time zones change by country from May 2021 to June 2022:
The final theme, earthquakes, uses a different daytime map with a more geological look and adds earthquakes for the past 24 hours. Size is proportional to magnitude and the quakes fade out over 24 hours so the most recent are highly visible. Again it's possible to customize extensively via layers. You can show active volcanoes and control the colors used, transparency and which magnitudes to plot. The video below shows a month of earthquakes as seen in Catfood Earth:
Catfood Earth Layers
The layers tab is where you can fully customize Catfood Earth. Use the checkboxes to activate layers and then click each layer to access detailed settings. Layers are listed in the order that they are drawn (i.e. clouds are drawn on top of the day map, and then night is drawn on top of the clouds and so on).
The first layer is the daytime map. Catfood Earth ships with two defaults. The first uses NASA's blue marble 2 monthly images, merged with a more attractive ocean image. Catfood Earth interpolates these images daily so the extent of snow/ice and vegetation will change in a subtle way throughout the year. The other default is a less colorful map that I feel works well with earthquakes and volcanoes. You can also browse to and select a different image if you don't like the defaults.
All the images and data layers in Catfood Earth use an equirectangular projection so if you are using custom images you should make sure that they use the expected projection.
Clouds come from the Space Science and Engineering Center at the University of Wisconsin-Madison. These images are web mercator by default, my website downloads the global composite every hour and transforms the image to equirectangular for Catfood Earth. If you have a different source for clouds you can enter a custom URL. You can also set the color and transparency of the clouds layer. The defaults are designed to make the clouds fairly subtle.
The last natural layer is the nighttime map. Catfood Earth ships with NASA's 2016 update to city lights. This layer is drawn on top of daytime and clouds where it is currently nighttime (updated as often as every minute, see advanced options below). You can set the transparency of the layer and also the width used to blend the terminator between day and night (in degrees). It's also possible to select a different nighttime image if you prefer.
The time zones layer is based on the IANA time zone database. You can change the colors used to show the time zones and control the transparency of national and international zones. You can also choose if minutes are displayed with the time zone legends at the top of the screen. This is a good layer to use in combination with the Places layer and the Political Borders layer (both described below).
This layer displays political borders in a configurable color.
The places layer shows a list of places optionally combined with the local time for each place. I've used this to show office locations around the world (handy to know if it's a good time to call someone) and also to track my geographically dispersed family. Catfood Earth ships with a default list of major cities. You can add to this, or remove everything and start from scratch. You can even export and import the list to make it easy to share between different devices. For each place you just need to provide the latitude, longitude and time zone (from the same source as the time zones layer).
Earthquake data is downloaded from the USGS feed and can show global quakes from magnitude 2.5 up. There is a lot you can fine tune for this layer - The fill and accent colors, number of past hours to show (up to 24), the transparency range (older earthquakes are more transparent) and the minimum magnitude to plot. You can also choose whether to show descriptions or not and the order in which to plot the quakes (time based, or size based which makes it easier to see what's going on when a lot of quakes hit a small area).
Volcano data comes from the Smithsonian Institution's Global Volcanism Program. This shows currently active volcanoes around the world. You can set the fill and accent colors, the transparency to use and whether to show descriptions or not.
The final layer shows weather radar from the National Weather Service. This layer is US only. Enter a list of one or more radar stations to display, separated by commas. You can find your local station(s) at the NWS web site.
Catfood Earth Advanced
The advanced tab of Catfood Earth Settings controls how the final image is displayed and also allows you to render sequences of images (this is how I made most of the videos above).
Set how often the image is updated in minutes, as frequently as every minute which is handy if you're displaying the local time for places. You can also skip the first update when Catfood Earth loads (potentially useful at boot time when Windows is starting a lot of programs).
There are some settings relating to text display: a global font size and an option to use drop shadows.
Earth can be centered to a specific longitude (default 0) or to a specific time. If you choose a time then the image will rotate throughout the day to keep that local time at the center of the screen.
It is also possible to set a specific output size and location for the wallpaper. The default is to fill the screen.
Click Render Images to output a sequence of images. If you use a proxy server click Proxy Settings to configure.
Finally there are some troubleshooting options that you might be asked to use if you need help with the product.
Render Images allows you to create frames from Catfood Earth based on current settings. This is useful for making animations based on how the Earth image changes over time. Set a start date/time (UTC), how to increment time between frames, the number of frames to generate, the size and an output folder. Earth will then create a sequence of JPEGs. This works well with computed layers like day/night and time zones. It will not work well with live data like clouds and earthquakes. I have made videos from live data as well, but this involves storing many images and/or data points and is not currently supported in Catfood Earth.
Catfood Earth for Android
Catfood Earth is a little different on Android. Because phones are mostly used in a portrait orientation the wallpaper shows the full range of latitude but only a segment of longitude depending on the screen size of the device. The wallpaper is the same as the natural theme in Catfood Earth for Windows (blue marble 2 day map, clouds, city lights night map) with the optional addition of earthquakes.
Run Catfood Earth and click Settings to configure. The slice of Earth displayed is based on a central longitude. By default this will update to your phone's current location. You can also set a manual location. -90 degrees works well to center North America. In addition to the central longitude you can opt to show recent earthquakes, control cloud and night transparency and the width of the terminator between day and night. There are advanced options to ignore screen size changes and reuse the most recent image, and to paint black under the menu bar which is useful on some devices.
After configuring Catood Earth just select it as your current wallpaper. You can do this from device settings or tap the Set Wallpaper button in the Catfood Earth app.
Catfood Earth for Android is optimized for battery life. It will update around every ten minutes and so it might take that long to see any changes to settings. Clouds are downloaded every hour. If using your phone location it accesses the last location fix established by other apps.
Installation and Support for Catfood Earth
Catfood Earth for Windows requires version 3.5 of the .NET Framework. On Windows 10 you need to go to Programs and Features and then Turn Windows features on or off, find .NET 3.5 and enable it. The installer for Catfood Earth is not currently digitally signed. You may get a warning when downloading and again when installing which you will need to ignore to proceed. I plan to fix both of these installation limitations at some point in the future.
For support please visit this post, check to see if your issue has already been addressed and if not leave a new comment.
- Catfood Earth 4.10
- Catfood Earth 4.01
- Catfood Earth for Android 4.00
- Catfood Earth 4.00
- Catfood Earth 3.46
- Catfood Earth 3.45
- Catfood Earth 3.44
- Catfood Earth 3.43
- Catfood Earth 3.42
- Catfood Earth 3.41
- Catfood Earth 3.40
- Volcanoes Back (Catfood Earth 3.30)
- Catfood Earth for Android 1.40
- Catfood Earth 3.20
- Catfood Earth for Android 1.20
- Catfood: Earth for Android 1.10
- Catfood: Earth for Android
Catfood Earth 4.10
Catfood Earth 4.10 is available for download.
The National Weather Service updated their weather radar API. The weather radar layer has changed a bit, you can enter one or more (comma separated) weather station IDs and Earth will show one hour precipitation for all of them. You used to be limited to a single station but with more options for the rader layer to display. Let me know if you love or hate the new version.
4.10 also includes the latest 2021a time zone database.
(I'm sure there are great reasons for it, but the 'new' NWS API is an XML document per station that links to a HTML folder listing of images where you can enjoy parsing out the latest only to download a TINY GZIPPED TIFF file FFS).
Catfood Earth 4.01
Catfood Earth 4.01 is available for download.
The timezone database has been updated to 2020a. There is also a small fix to a problem with screensaver installation on recent versions of Windows 10.
Catfood Earth for Android 4.00
Catfood Earth for Android 4.00 is available for download and is updating through the Google Play Store.
As with the 4.00 update for Windows all images have been remastered to 4K resolution. Earth for Android has also been updated to better support Android 10 (updates are faster and the settings layout looks much better). You'll need to grant location permission in settings to have Earth automatically center on your current location. It's also possible to set a center longitude manually (I find -90 works well for centering most of the Americas).
Catfood Earth 4.00
Catfood Earth 4.00 is available for download.
The main change is that all of the images shipped with Catfood Earth have been remastered to 4K resolution. This includes NASA Blue Marble 2 monthly images (which Catfood Earth interpolates daily) and the 2016 version of Black Marble (city lights at night). The Catfood Earth clouds service has been updated to full 4K resolution as well.
Earth 4.00 also includes an update to the 2019c version of the Time Zone Database.
As well as providing desktop wallpaper and a screensaver, Catfood Earth can render frames for any time and date. To celebrate the release of 4.00 I created the 4K video below which shows all of 2019, 45 minutes per frame, 9,855 frames. You'll see the shape of the terminator change over the course of the year (I always post the seasonal changes here: Spring Equinox, Summer Solstice, Autumnal Equinox, and Winter Solstice). If you watch closely you'll also see changes in snow and ice cover and even vegetation over the course of the year.
Catfood Earth 3.46
This follows hot on the heels of the last release as the new clouds layer service running on this blog can update far more frequently than the source used prior to 3.45. You will now get a fresh helping of clouds every hour! Unrelated to this release I've improved the quality of the clouds image as well. If you're interested you can read about this in exhaustive detail here.
Catfood Earth 3.45
I only just released 3.44 with some timezone updates but in the past week the location I had been using for global cloud cover abruptly shut down. If you like up to date clouds you'll want to install the new versions as soon as possible. With this update I'm building a cloud image every three hours and serving through this blog (and thankfully CloudFlare) so any further changes should not require a code release.
Catfood Earth 3.44
Catfood Earth 3.44 is now available to download.
The timezone database has been updated to 2018i.
A bug that could cause all volcanoes to be plotted at 0,0 depending on your system locale has been fixed.
Catfood Earth 3.43
Catfood Earth 3.43 updates the timezone database to 2018e. The big change is that North Korea is moving back to UTC +09 today (May 5, 2018). The time zones layer in Catfood Earth shows the current time in each zone at the top of your screen and color codes each country and region. You can also display a list of specific places (either an included list of major cities or your own custom locations).
Catfood Earth is dynamic desktop wallpaper for Windows that includes day and night time satellite imagery, the terminator between daytime and nighttime, global cloud cover, time zones, political borders, places, earthquakes, volcanoes and weather radar. You can choose which layers to display an how often the wallpaper updates.
Catfood Earth 3.42
Catfood Earth 3.42 is a small update to the latest (2016d) timezone database and the latest timezone world and countries maps from Eric Muller. If you use the political borders, places or time zones layers in Catfood Earth then you'll want to install this version.
Catfood Earth 3.41
Catfood Earth 3.41 fixes a problem that was preventing the weather radar layer from loading.
Catfood Earth 3.40
Both updates fix a problem with the clouds layer not updating. The Android update also adds compatibility for Android 5 / Lollipop.
Also, Catfood Earth for Android is now free. I had been charging $0.99 for the Android version but I've reached the conclusion that I'm never going to retire based on this (or even buy more than a couple of beers) so it's not worth the hassle. Catfood Earth for Windows has been free since 3.20.
Volcanoes Back (Catfood Earth 3.30)
Catfood Earth fans will want to download Catfood Earth 3.30. This update fixes a problem where volcanoes were all plotted in the middle of the screen.
Catfood Earth for Android 1.40
Catfood Earth 3.20
Catfood Earth 3.20 for Windows is now available for download. This update fixes a change in the feed address for the earthquakes layer. I've also switched to using the new NASA Black Marble night-time image and 3.20 includes the latest time zone and political border data.
Earth for Android has been updated to 1.30. This includes the new Black Marble image.
Catfood Earth for Android 1.20
I recently upgraded to the HTC One which has a transparent notification bar. This makes it hard to see notification icons when using Catfood Earth as your wallpaper, at least in the summer when it's always light at high latitudes and your white icons are displayed on top of polar ice and clouds.
Catfood Earth for Android 1.20 fixes this with an option to paint black under the notification bar. That's the only update other than the latest Xamarin runtime.
Catfood: Earth for Android 1.10
I’ve just released Catfood Earth for Android 1.10. You can control the center of the screen manually (the most requested new feature) and also tweak the transparency of each layer and the width of the terminator between day and night. It also starts a lot faster and has fewer update glitches. Grab it from Google Play if this looks like your sort of live wallpaper.
Catfood: Earth for Android
I’ve just released Catfood Earth for Android. It’s my second app created with Xamarin’s excellent toolkit. Being able to develop in C# allowed me to reuse a lot of code from the Windows version of Catfood Earth. The Android version doesn’t include all the same layers (yet) but it’s got the main ones – daytime (twelve different satellite images included, based on NASA’s Blue Marble Next Generation but with some special processing to make them look better), nighttime (city lights, shaded to show nighttime and the terminator between day and night) and a clouds layer that is downloaded every three hours.
My main worry had been that this would suck the phone battery dry, but after a fair amount of optimization it doesn’t even register on the battery consumption list. Grab it now from Google Play ($3.99, Android 2.2 or better).