maning's diary

Recent diary entries

OSM-PH tagging suggestion

Posted by maning on 8 June 2011 in English (English)
Location: Provident Village, Jesus Dela Peña, Marikina, Metro Manila, 1803, Philippines

changing rivers and streams in Marikina-Pasig basin

Posted by maning on 1 March 2011 in English (English)

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 [1] have dramatically altered many river channels.

My personal goal for updating river data is to support research initiatives on flood monitoring [2] 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]

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. [4] I'm interested to know whether they have a pig s*%t processing before dumping water to the river.


Location: San Mateo Municipal Dumpsite, Pintong Bocaue, Rizal, Calabarzon, Philippines

An elitist view towards mapping in the age of the internet.

Posted by maning on 7 February 2011 in English (English)

You can't create maps in Florida unless you are a licensed surveyor!

Join QC Scout Area Mapping Party

Posted by maning on 2 February 2011 in English (English)

Help us map bars, cafes, nightclubs, buildings and other micro details in the Quezon City Scout Area on Feb 12, 2010.

More details here:

Location: Fernandez Compound, Bungad, District I, Quezon City, Metro Manila, 1105, Philippines

more open geodata in Mindanao

Posted by maning on 29 January 2011 in English (English)

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 [1]). 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 [2].

Second is a short OSM workshop with the students of long time Davao mapper murlwe [3]. 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. [4]

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).


Location: Pryce Business Park, Timburana Compound, Santos Compound, Davao City, Davao, 8000, Philippines

Second wave of Bing imagery in the Philippines

Posted by maning on 21 January 2011 in English (English)

Barely 3 months after the first announcement, Eugene noticed that Bing imagery was updated in a lot of areas in the Philippines [1].

We started to update our list [2] 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.


Flooding in Zamboanga

Posted by maning on 4 January 2011 in English (English)

Editing roads and rivers in Zamboanga City out of Bing imagery.

My personal aid/response to the victims of flooding in the City:

Location: Aurora Village, Luyahan Urban Poor Subdivision, Barangay Tumaga Por Centro, Zamboanga City, Zamboanga Peninsula, 7000, Philippines

armchair mapping in Albay

Posted by maning on 30 December 2010 in English (English)

Albay Province in the Philippines is in a state of calamity due to the continues rains the past few days [1]. Bing has some hires within selected towns [2].

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.


Location: Renelisan, Santo Domingo, Albay, Philippines

kill those philippine saw-tooth coastlines!

Posted by maning on 14 July 2010 in English (English)

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:

Location: Tuktukan, Taguig, Metro Manila, Philippines

The boundingboxes of all my openstreetmap edits in the Philippines

Posted by maning on 22 June 2010 in English (English)

are we becoming a victim of our own success?

Posted by maning on 19 April 2010 in English (English)

In the next few hours (or minutes), we will have our 250k user signing-up. In our side of the patch (PH), we are getting more contributors as well. However, this comes with price. Very recently, we are seeing more "suspicious edits". As good OSM citizen we "politely" send them messages.

Some of these suspicious edits are then removed as soon as possible.

Just a few hours ago, someone sent me a message that on another mapping project, the user is copying OSM data. We have proven that the data indeed came from OSM. Thankfully, the maintainers quickly discarded these contributions.

As OSM becomes more of a force here in the Philippines, I foresee that we will be getting more of this kind of contributions. We can't monitor everything. We need more tools to monitor this behavior.

Planned Data Import for Bohol Island, Philippines

Posted by maning on 30 March 2010 in English (English)

We are in the process of importing road and POI data in Bohol Philippines.

Details here:

And discussion here:

Join the discussions if anyone wants to help.

Location: Bool Barangay Headquarters, Tagbilaran, Bohol, Philippines

jumpstarting coverage in Rizal, Philippines

Posted by maning on 5 March 2010 in English (English)

I am currently improving road data along several towns of Rizal (Antipolo, Taytay, Angono, Binagonan, Cardona Baras, Tanay, Antipolo) using Yahoo!. Editing will end until I reach the edge of the imagery.

Location: LaFarge Cement, Maia Alta, Antipolo, Rizal, Calabarzon, 1870, Philippines

Marikina City Mapping Party

Posted by maning on 25 February 2010 in English (English)

We will have our Openstreetmap Philippines Marikina City Mapping Party
on March 20, 2010.

Invite your friends. We will teach you how to map using GPS, paper,
on foot, car or bike. Let's make Marikina City the best mapped city
in OSM.

It's fun. It's free. You can help.

Please watch this page for more details:

Location: Paliparan Subdivision, Santo Niño, Marikina, Metro Manila, 1803, Philippines

new imagery available in Bulacan, Pampanga and Nueva Ecija area (SPOT5)

Posted by maning on 21 January 2010 in English (English)

This came from the SPOT5 donated by Spot-Asia and Certeza Infosys last
year. Pixel resolution is around 10 meters date taken 2008-03-12.

Instructions on how to use in the wiki:

And my blog post here:


Location: to Pinagrealan Cave, Bigte, Bulacan, Central Luzon, Philippines

a lot of whitespace for Philippine armchair mapping

Posted by maning on 18 January 2010 in English (English)

I recently created a wikipage for the inventory of high-res images available for the Philippines [1]. I found out there's a lot of work we can do even without GPS.

Armchair mapping can be very handy to add road stubs and other details even if you don't know much of the area.

I found out recently a typical newbie behavior in the Philippines. Newbies usually don't touch white areas even if there is available high-res imagery. They usually correct something or add a few minor details that go out into the vast whitespaces.

Seeing the whitespots from my highres imagery inventory page, I started adding road along the Pampanga area [2] and will continue in the coming days. I hope newbies locals can fill in the details.

Anyone can also contribute, but for now, I encourage everyone to donate some mapping time to Haiti [3] and Albania [4].


suggested features to map in Haiti

Posted by maning on 15 January 2010 in English (English)

I suggest we focus tagging these features for Haiti Openstreetmap Response. Most of these features are visible in the GeoEye imagery.

- Roads
- Bridges
- Temporary campsites - tourism=campsite refugee=yes
- Damaged Buildings - building=collapsed
- Large open spaces to serve as relief operation centers

More info here:

Location: 1re Saint Martin, Delmas, Ouest, Port-au-Prince, Département de l'Ouest, Haiti

2010 Plans for Mapping Marikina City, Philippines

Posted by maning on 4 January 2010 in English (English)

For the past years I am continuously editing Marikina City for roads, cycleways and footways. I believe OSM has the most "road complete" map of this City. However, I haven't really made a systematic approach or metric to say it is complete. You just have to take my word for it.

So for this year, I made a checklist of what to map and started logging all my activities in my wiki page:

I hope in twelve months or less I can finally declare this patch as "complete" and move on to mapping (ugh!) house numbers.

Location: New Marikina Subdivision, Santa Elena, Marikina, Metro Manila, 1610, Philippines

holiday edits in Marikina

Posted by maning on 29 December 2009 in English (English)

I've been filling small gaps on my relatively "road complete" patch this holiday. Funny you can still find a few footways here and there.

So far I was able to:
- complete city administrative boundaries:
- add a few POI along one of the major commercial strip:
- edited and merged several landuse boundaries

POI mapping is relatively easy on bike and a camera. You need to slow down a bit and try to balance one hand holding the gps (I don't mount the unit onto my bike because vibration for smoothness:horrible roads makes my trace wiggle unnecessarily) and the other holding the digital camera.

There is a little bit of personal bias with my preference on what POI to map. Others can of course fill in the gaps.

One question, on estimating the distance of POI from the road, I usually place it 5 -10 meters from the road centerline depending on how wide the roads are. Is this common practice?

Location: Marikina East Subdivision, San Roque, Marikina, Metro Manila, 1610, Philippines

finally edited my first trace

Posted by maning on 17 December 2009 in English (English)

I've been a member of this project for nearly 4 years. Today I finally traced and edited the very first GPS track I uploaded.

I have completely forgotten this trace because loading the java editor back then was painfully slow.

Location: Maharlika Highway (AH26), Tuguegarao, Cagayan, Cagayan Valley, 3500, Philippines
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