Recent diary entries
Catching up on the slides and tweets of the successful SOTM 2013 in Birmingham, I found this very interesting talk by Alyssa Wright (@alyssapwright). The slides discussed the general trend of a male-gender-biased-tagging of features in OSM (see slides #72 to #79).
This reminded me of a resource mapping and assessment we did for an Indigenous Peoples in the Philippines. The research covers a protected area where several IPs communities (Batak and Tagbanua) are living. Part of the research is to conduct participatory mapping workshops with several IPs villages. We used a physical 3D model (very similar to this approach) to allow community members to identify key resources and other geographic features.
During the series of mapping workshops, I insisted that as an initial mapping activity, we divide the group into men and women. Both groups will have its own 3D model and they were instructed to identify important geographic features within their community. The final map will be an integration of both workshop output.
The map showed very interesting results.
The men group covered a larger extent of the area, common features they identified are:
- names of all major rivers and streams;
- location of hunting grounds including accurate position of where they hunted the largest wild pig, snake, or eel;
- important trees for gathering resins and wild honey;
- approximate boundary of forest cover types.
The women group on the other hand covered a smaller area mostly within the established settlements of the tribe, common features they identified were:
- location of community structures such as schools, place of worship, community halls for gatherings;
- sources of clean water (wells and springs);
- a stream that regularly overflows limiting access to children going to school;
- patches in the forest to gather medicinal plants and other wild vegetables;
- patches of swidden farmlots.
The community mapping exercise provided a rich source of information for the resource mapping and assessment. Moreover, conducting a separate mapping workshop to each gender group in the community encouraged greater participation of women.
Both maps shows very different priorities and perspectives but not one more important than the other.
OSM-Philippines have a new logo. Eugene (seav) designed this logo using the original OSM logo as its inspiration. He added the basic outline of the country's archipelago and the three stars and a sun elements of the Philippine flag.
The community love it! Thanks to Eugene for designing our new logo!
Available here as svg and png: http://wiki.openstreetmap.org/wiki/File:OSMPH_Logo.svg
SteveC recently started a Kickstarter campaign for a GPS Art Poster. Since my country is not included, I decided to check the tracks around my OSM patch.
The image below shows all the publicly available traces in OSM (not all of them are mine but most are) and also some I didn't uploaded over Marikina City. I probably have more lying around SDcards and in my GPS internal memory.
The image does gives you a personal story of your mapping expeditions.
The "low-res" tracks along the circular roads (northeast) were one of my earliest mapping for OSM. Back then, I was using an old eTrex without an SDcard slot. It would take around 2 hours of walking to fill the internal memory. To download the data, I hacked an old serial cable mouse and a plastic card (very similar to this rig) because buying the Garmin serial cable is almost half the price of the device.
The tracks made by my students (6 years ago) for an end of term mapping project is still very visible and were never replaced by a much better trace.
Someone (not me) must have forgotten to turn his/her GPS off and then uploaded the point cloud without any post clean-ups.
The lonely trace in Provident Village was when I visited a fellow mapper and delivered one of our GPStogo unit he is planning to use for a mapping expedition.
The large blank patches (center west) are private subdivisions where you are not allowed to enter unless you show an ID or you have an official car sticker. I never bothered cycling inside those posh subdivisions.
What's your GPS track story?
Testing the rendering of landuse and natural multipolygons using JOSM's Mapnik Style. Of course, it's not in the main OSM db!. :-)
Will @MapBox allow imagery tracing for OSM with their new satellite tiles? http://mapbox.com/blog/digital-globe-partnership/
I've been passing along doing housenumbers for years, partly because I find it too micro and partly because I am scared getting addicted :-).
I tried it before using my usual workflow, bike and a GPSr. It usually takes half an hour to collect some numbers, another hour to download the trace, edit in JOSM and, finally upload. Months of work got me this result.
After that month, my drive to do it died.
Recently, I stumbled upon KeypadMapper. The wiki promised a "rapid data collection" approach to address mapping. So, I tried it, and it delivered its promise!
Again, with a bike and this time a 'droid phone, I was able to collect housenumbers in a fraction of time than with my old workflow. I like the simple interface (you can collect a housenumber in less than 3 phone taps). It creates a .osm file and with just a few adjustments, you can upload them via JOSM. The map below took me less than a week to finish.
There are a few tips I find useful using this app.
- You need to be on a consistent speed and direction. The app considers your movement direction to approximate which side of road (left or right) the housenumber is located.
- An accuracy of <6 meters is probably the best.
- Slow walking will produce low quality GPS trace with jagged lines which influences which side of road the housenumber will be located.
- It is better to focus on one side of the road for one trip and then the other side on another trip. Editing will be easier since you are sure all your housenumbers are on one side and you can adjust them accordingly in JOSM.
Any other advice for doing address mapping? Please share them below.
I just did a test on using the exif information from geotagged photos for mapping. This time, I set my phone (Samsung GT-S5300) to add the location in the exif data. Using the same phone, I also logged my tracks as a background process with GPSLogger.
The image below shows the image location in JOSM using the exif's lat/lon data. The GPS trace is also shown. Notice that the photos are arranged in a grid-like manner and does not entirely correspond to my tracks.
Using the traditional photo to gps position correlation in JOSM, the photo location is way more accurate.
Just to test if this is a JOSM bug, I tried reading the photo's exif tag in QGIS using the Photo2shape plugin and it shows the same grid-like position in the first image.
Just happy to report that last week I was in a university down south
helping several university faculty with their research activities. My
role is simple, make their research output map aware. After 4 days of
informal workshops we were able to collect data, transform them into
maps and relate these information into their respective research which
range from the natural science, social science and engineering domain.
One of the great dataset we were able to utilize is the tremendous
detail of OSM data in their research areas. While road data is not
the main dataset they are interested in. The availability of this
data allowed us to focus on the other data needed and use OSM as
complement in various forms. Either as baselayer for a webmap, a
reference for geocoding raster images, a timeshot for understanding
urban expansion and landcover changes. I will give more details once
these projects gets into public release (you know how the academe
works :) ).
Another important note is that prior to being a user of the data these
faculties are first and foremost contributors and supporters of OSM
 so they are aware of the spirit and motivations of OSM.
My personal advise to anyone interested in using OSM in their own
projects (either for fun or profit), be a contributor first. ;)
My mapping patch is getting a little bit cold these days. I added a few buildings and corrected some roads and park tags to keep it warm and cuddly. ;)
[I sent this message to the talk-ph list. Posting here just in case other osm-ph mappers not subscribed have other ides. ]
I am know collating my mental notes in preparation for the "State of
the PH" lightning talk for SOTM2011. And since this is a community
presentation, I might as well ask you on what we should be presenting.
The primary source materials of my talk is the wiki [0,1,2] and of
course, this list . For sure the OSM-PH data has grown tremendously
in the the past 2 years. There a number of factors that may have
contributed to this growth. I would like to focus the presentation on
on 4 main points. Perhaps you can help me develop the discussion.
1. The osm-ph community. Who is the "community"? What characterize a
PH OSMer? How do we map? What are the innovative ways we do to
improve the map? Are the data users part of this community? Is the
talk-ph list and discussions here a representative sample of the osm-ph
2. How do we use the data? Some sample of data useage we can
illustrate. Maybe a ph brewed mapping application? Or other ways you
have used the data? If there are any,
please provide a link or description and a screenshot.
3. Issues and concerns. Why are we growing in some areas but not
in others? How do you guage our relationship with other crowdsource
mapping initiative in the country (google mapmaker, roadguide.ph, wikimapia)?
4. The future. How do you see the state of PH data in a year or two?
What should be done to further improve and expand data coverage?
If you any thoughts, just send them here or as a PM. Thanks!
Just a thank you note to Cambodian OSMers for doing a splendid job mapping the country.
My colleague have just returned from a 2-week trip in Cambodia and she was very impressed with the existing map data.
She used a Garmin device loaded with OSM from http://garmin.openstreetmap.nl/
Inspired by: http://whatosm.textual.ru/files/panorama2.jpg
I have been editing rivers and stream within the Marikina-Pasig river basin for the past few weeks. Typhoon Ondoy/Ketsana which caused the most catastrophic floods in the country  have dramatically altered many river channels.
My personal goal for updating river data is to support research initiatives on flood monitoring  and effective basin management.
Thanks again to Bing, new imagery is available in the whole basin/watershed. Icing in the cake are the imagery dates which are between October 2009 to Feb 2010. All of which are post-Ondoy/Ketsana.
Over the course of my edits, I have observed general geographic phenomena that is happening in this area:
1. The floods have dramatically altered many river channels. Previous courses where diverted due to landslides and other obstructions.
2. Many river and stream channels are now gone. This is not primarily due to the floods but of the rapid urbanization in the area. Most of rice paddies are now converted to subdivisions. As a result many of the natural irrigation channels, intermittent creeks and streams are either completely filled up, diverted or the stream banks are constricted thereby limiting natural flow. 
3. Within the headwaters of one major river (Boso-boso River) is a big industrial pig farm. I noticed that some canals coming from their waste ponds drains towards the river.  I'm interested to know whether they have a pig s*%t processing before dumping water to the river.
You can't create maps in Florida unless you are a licensed surveyor!
Help us map bars, cafes, nightclubs, buildings and other micro details in the Quezon City Scout Area on Feb 12, 2010.
More details here: http://wiki.openstreetmap.org/wiki/QC_Scout_Area_Mapping_Party
I'm about to leave Davao in a few hours. This trip is day job fieldwork. I had very limited opportunity to do some OSMing but I am very happy sharing the OSM love.
First up, is a local caving community (Speleo Davao ). I showed them what we can do with OSM and a couple of their members showed keen interest. I left one of our gpstogo units to the group so that they can start mapping their own cities .
Second is a short OSM workshop with the students of long time Davao mapper murlwe . Thanks to Yahoo!, Bing and P2, the workshop took little effort to explain and demonstrate. A couple of students are starting to add data in their own towns. 
The task of creating the best map of the Philippines is enormous and I find personal comfort that more local mappers are sharing the load (and fun).
Barely 3 months after the first announcement, Eugene noticed that Bing imagery was updated in a lot of areas in the Philippines .
We started to update our list  and so far, we have better coverage for the whole Metro Manila and many adjacent provinces. Visayas and Mindanao got a lot imagery as well.
Re-check your areas and start using this great resource.
Editing roads and rivers in Zamboanga City out of Bing imagery.
My personal aid/response to the victims of flooding in the City:
Albay Province in the Philippines is in a state of calamity due to the continues rains the past few days . Bing has some hires within selected towns .
I added a few stub road (highway:road) in Malilipot, Tabaco and Bacacay, hope this helps in improving the data. Rivers need to be mapped as well.
Almost 3 years ago, we did a rough import of coastlines for the Philippines. The data came from the 90m pixelled SRTM converted to vector lines. Since this data came from a raster source, outlines appear jagged like a staircase, which we called as saw-tooth coasts.
The objective then is to provide a small-scale outline of the coasts and allow mappers to improve them (by using LANDSAT or PGS data). The problem persists to this day because, editing coastlines is too tedious and in some cases, dangerous.
In order to easily identify where the sawtooth problem occur, we created a simple webmap .
Large circles means more jagged steps.
More mappers are needed to nuke the sawtooths. If anyone wants to help, see details here: http://wiki.openstreetmap.org/wiki/WikiProject_Philippines/Coastline_Corrections