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Archive for August, 2010

Do-It-Yourself Aerial Mapping At GrassrootsMapping.Org

The Grassroots Mapping wiki collects information, how-tos, current projects and general resources for creating your own georectified aerial imagery using cheap hardware to acquire the imagery (balloons, kites, and UAVs). Check out the main site for blog entries on current projects as well. From the website:

Seeking to invert the traditional power structure of cartography, the grassroots mappers used helium balloons and kites to loft their own “community satellites” made with inexpensive digital cameras. The resulting images, which are owned by the residents, are georeferenced and stitched into maps which are 100x higher resolution that those offered by Google, at extremely low cost. In some cases these maps may be used to support residents’ claims to land title. By creating open-source tools to include everyday people in exploring and defining their own geography, Warren hopes to enable a diverse set of alternative agendas and practices, and to emphasize the fundamentally narrative and subjective aspects of mapping over its use as a medium of control.

One of the resources highlighted is the Cartagen Knitter, a simple online application for knitting together multiple aerial images into a single one for georeferencing using GIS software or an online service like Map Warper. Here’s a video demo:

Cartagen warping tool demo from Jeffrey Warren on Vimeo.

More related videos here.




Draw And Edit Google Maps My Maps Layers With DRAWaMAP

Joining quikmaps and ScribbleMaps, DRAWaMAP lets you draw features in a Google Maps interface, and save them. Supported features include:

  • Lines
  • Markers
  • Polygons
  • Time polygons – you set a time and speed, and DRAWaMAP draws a polygon encompassing the walking distance around that point based on Google Maps data.
  • Map Density Quadtree – ? Not sure, but it seems to create an editable polygon feature based around a starting and ending point.
  • Adjustable fill color / feature opacity.

Data import/export/editing features are very limited compared to quikmaps and ScribbleMaps, but unlike those two, DRAWaMAP lets you import or export data directly from/to Google Maps MyMaps. The symbology/iconology used in DRAWaMAP is substantially different than that used in MyMaps, which takes some getting used to; controls are a bit cryptic as well:

drawamapcontrols

There’s a help button that brings up short, helpful video tutorials for some of these, but others will require experimentation to figure out. But to view these help videos, make sure you enable allow pop-ups from the DRAWaMAP site; otherwise you may wind up wasting time by pushing the help control buttons multiple times to no effect before figuring it out (like I did :).  As the videos demonstrate, this AJAX app’s interface is designed to make it usable on a mobile phone, making it a decent alternative to the main Google Maps MyMaps web-based editor on those devices.

Via GoogleMapsMania.




Easy Conversion Of GPX Files To Garmin Format With GPX2IMG

Joel emails to announce that his GPX2IMG program is finally ready for official release. GPX2IMG imports standard GPX data files (tracks and waypoints), lets you edit them, converts them to IMG Garmin-compatible format, and even installs the map file into MapSource or BaseCamp for easy upload to your Garmin GPS unit. The program isn’t fully free; regular price is $20 (available for $13 until 9/23/10). However, the demo version will let you import up to two GPX files, edit them, convert them to .img format with a watermark, and even install them in MapSource; the registered version removes the file limit and watermark.

Interface is clean and simple; load in your files and view the data in a map window. GPX2IMG lets you select waypoints and tracks, edit their names and other info, and set their appearance to standard Garmin point/line types:

gpx2imgscreenshot

You can’t modify the actual track point data itself, nor can you move a waypoint/POI. You can create a waypoint by double-clicking the map area, but the inability to set the specific latitude/longitude of  that waypoint is a drawback. You can use custom TYP files to create your own linestyles; instructions are in the comprehensive help file (and there are videos on the GPX2IMG website).

Once you’re done with adding/editing data, set the desired parameters in the Preferences window:

preferences

Then click on the “Convert Checked Files” button to start the process. In the unregistered version, you’ll have to wait 15 seconds. GPX2IMG will compile the GPX data into a .img file, and then install it for use in MapSource or BaseCamp for uploading to your Garmin:

MapSource

A few minor issues:

  • A waypoint file of mine didn’t import successfully; I’ve passed it on to the author, and I assume that issue will get fixed shortly.
  • You can only have one GPX dataset created by GPX2IMG loaded into MapSource/BaseCamp at a time; I would hope this will change, as that really is a major drawback.
  • You can’t uninstall the mapset from within the GPX2IMG program; you can use a separate program like MapSet Toolkit to do this, but I’d like to see that option directly within GPX2IMG.

You can create your own Garmin map from GPX files using fully-free tools; see my many-part series on Tools For Custom Garmin Vector Maps. Doing it yourself is more complicated, takes longer, and there’s a steep learning curve, but you’ll have more flexibility in the final results. But if you want to bypass those complexities, and just quickly generate simple Garmin map files from your own data, GPX2IMG works and is easy to use. Even the limited demo version has enough utility to make it worthwhile.

Note: See comments section for Joel’s info on updates/fixes.




OpenDragon: New Open-Source Imagery Analysis Program

The Global Software Institute announces that their Open Dragon software, a variant of Goldin-Rudahl’s Dragon/ips software for aerial/satellite imagery analysis, is now freely available for non-commercial use, and the Java source code will be released as open source sometime in the near future. From their press release:

OpenDragon offers a full suite of image analysis and raster GIS capabilities including image enhancement, supervised and unsupervised classification, geometric correction, measurement and statistics, vector capture and display, slope, aspect and buffer calculations and multi-criterion decision making. Open Dragon also includes the Open Dragon Toolkit, which allows users who can program in C to extend the software functionality. GSI will also make the source code for OpenDragon available for non-commercial use under an Open Source license during the next six to nine months.

Installation is currently kind of a pain – you have to register for a key code just to download the software, and then unzip all files to a directory. The setup program in the main directory doesn’t create the program directory but requires you to select one, so you should create that (and a Temp directory) before starting program installation. Registration requires an internet server connection that the program seems to have trouble establishing; this process will supposedly be simplified in the near future. And, at least under Windows 7, running the program downgrades the color scheme to Windows 7 Basic for some unknown reason; first time I’ve seen this with a Java program. No uninstall listing added, either, though with Java software just deleting the program directory and icons is usually good enough.

A full PDF manual is included with the installation package.

Added to The Big List Of Satellite/Aerial Imagery Analysis Software.




Multiple Coordinate Systems In Google Maps, Reverse Geocoding, And More With The Worldwide Coordinate Converter

Clement Ronzon emails about his new website, The Worldwide Coordinate Converter (TWCC for short). Drag the globe-shaped icon to the desired location in a Google Maps interface, and get a pop-up balloon with the geographic coordinates for that spot, elevation in meters, and the nearest reverse-geocoded address:

twccballoon

At right is a two-part coordinates box, with latitude/longitude/WGS84 always in the top part, and a user-selectable coordinate system at the bottom:

coordschooser

You can also enter coordinates into the appropriate boxes in either the top or bottom section, click Convert, and have them converted to the other coordinate system automatically (and plotted on the map).




Geographic Polling Website SurveyMapper Now Live For The United States

The Centre for Advanced Spatial Analysis, University College London’s SurveyMapper site has been live for the United Kingdom for a while now, but just added the ability to do geographic-based survey polls for the United States as well as Europe and the entire world. The process for creating a survey couldn’t be easier. After free registration, click the “Create Survey” button; the first page will ask for basic info:

Continue reading ‘Geographic Polling Website SurveyMapper Now Live For The United States’




New Android-Related Website: AndroGeoid

After my previous two posts on Android, you might expect to see posts on Android-related topics showing up here at Free Geography Tools. That was my original plan, but I’ve decided that Android is a distinct-enough topic to warrant its own website. So, I’m announcing my new Android-specific website, going online today (8/18/10): AndroGeoid. There, I’ll cover apps and topics related to using Android hardware and software to explore, measure, record and map the world. This will include obvious geography-related topics, like apps for :

  • GPS
  • GIS
  • Map displays
  • Compasses
  • And so on …

But the website’s focus will range well beyond that, to topics that encompass some of Android’s more unique capabilities;

  • Geographically-related Augmented Reality
  • Location-linked online information resources
  • Crowd-sourced data collection
  • Measurement apps that take advantage of Android’s sensor suite (accelerometers, orientation, magnetic field)
  • Applications for recording full sets of information linked to location: Coordinates, direction, orientation, notes, photos, videos, sound, panoramas, augmented/virtual reality, and more.
  • And other cool stuff …

The Android world is currently dominated by smartphones, connected wirelessly via 3G to the Internet, and I’ll cover apps that take advantage of that. But the ecosystem is likely to expand very soon to models that only come with WiFi connections, and even with smartphones there will be times when no connectivity is available. So, I’ll also cover apps that work with non-connected stand-alone Android devices.

And the name, AndroGeoid? Well, GeoAndroid  was already taken ;-). But AndroGeoid works for me: the geoid is:

that equipotential surface which would coincide exactly with the mean ocean surface of the Earth, if the oceans were in equilibrium, at rest, and extended through the continents …

So sayeth the almighty Wikipedia. In other words, all things geo-related to Android will flow downhill to the AndroGeoid.

The first couple of posts may look familiar – they’ll be slightly revised versions of the posts I’ve done this week on Android. New material should start showing up on Friday. Plus, I’ll have a brief weekly listing/recap of AndroGeoid posts on this site, usually on Fridays.

And in case you were wondering, I still expect to post regularly on the Free Geography Tools site at about the same frequency as I have been, about 4 posts a week. Hopefully, I can keep both sites up and running at the same time. Not unrelated, I’ve got a new Guest Post page up ;-).




Android: The Future Of Consumer GPS – Part II

After yesterday’s magnum opus about how Android will transform the consumer GPS industry, today’s shorter post is a few random thoughts on how the big three handheld GPS makers might be affected by Android, and how they might respond. Personally, I think it’s going to be tough for them to adapt. Up until recently, handheld GPS units have been a fairly limited specialty market, allowing manufacturers to control interfaces and map data, and charge exorbitant prices due to limited competition. In most consumer electronics fields, prices drop even as capabilities increase; that really hasn’t been the case for handheld GPS. Android has the capability to turn GPS into a commodity market, meaning less control and more competition, leading to lower prices. And this is an environment that the old-school GPS vendors may have trouble with.

Magellan: Magellan is still struggling to overcome the disastrous premiere of their Triton line in 2008: decent hardware with capabilities unique at the time (raster imagery, 3-axis compass) sabotaged by horribly buggy software. Most of these problems got fixed, but too late to make a difference. Magellan was acquired late in 2008 by MiTAC (parent company of Mio, and they’ve just recently announced a new series of Explorist models, due out this fall.  For standard GPS models, the specs on these look pretty good, and the prices are very competitive. But in the long run, I don’t see how they can compete with more-capable Android models that are likely to sell in the same price range or even lower.  Putting someone else’s Android unit into a Magellan body with a better antenna and waterproof/field-rugged design might be a better way to go. They already have some experience using that approach with their new case for the iPhone, which enhances the iPhone’s GPS abilities while offering better protection against the elements; they just have to do it more cheaply.

DeLorme: DeLorme has moved into second place for handheld GPS units with their PN series, the first consumer models with raster/aerial imagery, and the first models with an affordable subscription plan for this imagery. They’ve also come out with a new model recently, the PN-60, with an upgraded interface and the ability to interface with SPOT communicators for satellite text messaging. But $400 for a GPS with a 2.2” display? No touchscreen? No apps? Their $250 xMap software lets you upload GIS data (raster and vector) to their PN models, but you can already put raster imagery on Android models, and GIS vector data can’t be too far behind. I don’t see this proprietary hardware line as having much of a future, and they don’t have much experience with alternative hardware.

Garmin: Garmin seems to develop an OS for their GPS units, and then use it as long as they can. The OS developed for their eMap model in 1999 was adapted and upgraded for most of their handheld models through 2006, culminating in the classic 60/76Cx series. These were probably the best-selling handheld consumer GPS series of all time, and four years later are still among their most popular units. They’re only 2.5 years into their next-gen GPS OS, the one that powers the Colorado/Oregon/Dakota/62/78 series, and they’ve certainly released a ton of variant models in these lines. The question is whether they can move past their own proprietary hardware and software designs and move quickly to an Android platform, using their strong GPS expertise to bring additional features that will differentiate their models from the rest of the market.

I’d like to think so – I’ve been a Garmin fanboy for 10 years now, and even now that I own a Droid X, you’ll have to pry my 60Cx out of my cold dead hands. But their recent history isn’t encouraging. Their first attempt to move Garmin technology to a cellphone platform, the nuvifone, was universally despised by reviewers. Their second effort, the Garminfone, was based on the Android platform, and received much more favorable reviews; the car navigation software of the Garminfone is generally considered to be the best Android car navigation system so far. If the phone had come out in the latter half of 2009 as originally scheduled, it could have been a huge success. But instead, it was first released in June 2010, and was crippled by:

  • Older software; it ran Android 1.6 when every other phone being released at the same time ran Android 2.1
  • A custom interface that makes it very difficult to upgrade to more recent Android versions
  • Slow processor
  • 3 MP camera
  • A screen pixel count 1/4 of its similarly-priced competitors, and a smaller screen
  • Garmin car navigation software on competing models that, while not as good, was free
  • Lousy battery life
  • No headphone jack

In short, simply not competitive with other Android phones. A month-and-a-half after being introduced for $199.99, it was already discounted by $70, and was part of a “buy one, get one free” package from T-Mobile. Even with that, it’s only sold about 20,000 units, which Garmin themselves acknowledged as a disappoint performance in their latest quarterly report..

If Garmin is going to survive in the consumer market, they’re going to have to move faster than that in developing products. And they’re going to have to give up control of the overall interface in favor of Android’s standard, putting their interface into just their applications. And they need to leverage their GPS engineering capabilities and map data into advantages that make  their units stand out. If they don’t, they’re going to have a tough time surviving in this new market.