Re: [talk-ph] Waterways in NCR and surrounding provinces
I do a lot of waterway mapping where I do not know initially which way the river flows and wanted a way marking them when verified. I came up with experimentally marking them with oneway=yes ... Seems logical to extend that with oneway=no for tidal estuaries? Mike On 12 Sep 2013, at 03:22, rem zamora pompy...@gmail.com wrote: Good idea Jim. However it got me thinking also... in the case of Pasig river, the flow of the water depends on the time and tide of the day. Sometimes water flows inward from the bay to Laguna lake but there are times also that the water flows from the lake to the ocean (which is what seems to be natural to me, all water flows toward the ocean). Just a thought. This is the same case also in Malabon and some parts of Bulacan also :) On Sep 12, 2013 9:42 AM, Jim Morgan j...@datalude.com wrote: On Thursday, 12 September, 2013 09:31 AM, maning sambale wrote: In some cases, we had to switch the way direction to follow the the convention [0] that the direction of the way should be downstream Hah, I'd never really thought of this before. I guess a lot of times I start tracing from the sea backwards inland, so I've probably got this wrong a few times. It started me thinking though. If you were able to get the elevation data for the start point and end point of a waterway, you could probably work out the direction of flow from that, and apply it automagically. So what about canals? :-) Jim ___ talk-ph mailing list talk-ph@openstreetmap.org https://lists.openstreetmap.org/listinfo/talk-ph ___ talk-ph mailing list talk-ph@openstreetmap.org https://lists.openstreetmap.org/listinfo/talk-ph ___ talk-ph mailing list talk-ph@openstreetmap.org https://lists.openstreetmap.org/listinfo/talk-ph
Re: [talk-ph] Waterways in NCR and surrounding provinces
On Thu, Sep 12, 2013 at 9:31 AM, maning sambale emmanuel.samb...@gmail.comwrote: Some of the waterways were also used as a relation for administrative boundaries. My question is, do admin boundary relations requires that the each member should have a consistent way direction like waterways? Admin boundaries do not specify any required direction. So there is no incompatibility with river centerlines used as admin boundaries. In the same way, there is also no incompatibility with one-way road centerlines being used as admin boundaries too. ___ talk-ph mailing list talk-ph@openstreetmap.org https://lists.openstreetmap.org/listinfo/talk-ph
Re: [talk-ph] Waterways in NCR and surrounding provinces
Admin boundaries do not specify any required direction. So there is no incompatibility with river centerlines used as admin boundaries. In the same way, there is also no incompatibility with one-way road centerlines being used as admin boundaries too. Thanks Eugene for this clarification. It started me thinking though. If you were able to get the elevation data for the start point and end point of a waterway, you could probably work out the direction of flow from that, and apply it automagically. What we do in JOSM is to add the OpenCycleMap layer as another background layer to determine the highest point and use the Bing imagery to trace the waterways. tidal estuary For tidal estuaries like those in Bulacan, Pampanga and north Metro Manila, I agree this is difficult. But in most cases, we assume the water drains towards the sea as Rem suggested. -- cheers, maning -- Freedom is still the most radical idea of all -N.Branden wiki: http://esambale.wikispaces.com/ blog: http://epsg4253.wordpress.com/ -- ___ talk-ph mailing list talk-ph@openstreetmap.org https://lists.openstreetmap.org/listinfo/talk-ph
[talk-ph] Waterways in NCR and surrounding provinces
Dear everyone, We are currently updating all waterways over NCR and parts of Rizal, Cavite, Laguna, Bulacan, Pampanga and Bataan for an internal research. We are nearly complete with the first pass of tracing and will start the review in the coming days. In some cases, we had to switch the way direction to follow the the convention [0] that the direction of the way should be downstream. Some of the waterways were also used as a relation for administrative boundaries. My question is, do admin boundary relations requires that the each member should have a consistent way direction like waterways? For your advice. [0] http://wiki.openstreetmap.org/wiki/Tag:waterway%3Driver#How_to_map -- cheers, maning -- Freedom is still the most radical idea of all -N.Branden wiki: http://esambale.wikispaces.com/ blog: http://epsg4253.wordpress.com/ -- ___ talk-ph mailing list talk-ph@openstreetmap.org https://lists.openstreetmap.org/listinfo/talk-ph
Re: [talk-ph] Waterways in NCR and surrounding provinces
On Thursday, 12 September, 2013 09:31 AM, maning sambale wrote: In some cases, we had to switch the way direction to follow the the convention [0] that the direction of the way should be downstream Hah, I'd never really thought of this before. I guess a lot of times I start tracing from the sea backwards inland, so I've probably got this wrong a few times. It started me thinking though. If you were able to get the elevation data for the start point and end point of a waterway, you could probably work out the direction of flow from that, and apply it automagically. So what about canals? :-) Jim ___ talk-ph mailing list talk-ph@openstreetmap.org https://lists.openstreetmap.org/listinfo/talk-ph
Re: [talk-ph] Waterways in NCR and surrounding provinces
Good idea Jim. However it got me thinking also... in the case of Pasig river, the flow of the water depends on the time and tide of the day. Sometimes water flows inward from the bay to Laguna lake but there are times also that the water flows from the lake to the ocean (which is what seems to be natural to me, all water flows toward the ocean). Just a thought. This is the same case also in Malabon and some parts of Bulacan also :) On Sep 12, 2013 9:42 AM, Jim Morgan j...@datalude.com wrote: On Thursday, 12 September, 2013 09:31 AM, maning sambale wrote: In some cases, we had to switch the way direction to follow the the convention [0] that the direction of the way should be downstream Hah, I'd never really thought of this before. I guess a lot of times I start tracing from the sea backwards inland, so I've probably got this wrong a few times. It started me thinking though. If you were able to get the elevation data for the start point and end point of a waterway, you could probably work out the direction of flow from that, and apply it automagically. So what about canals? :-) Jim __**_ talk-ph mailing list talk-ph@openstreetmap.org https://lists.openstreetmap.**org/listinfo/talk-phhttps://lists.openstreetmap.org/listinfo/talk-ph ___ talk-ph mailing list talk-ph@openstreetmap.org https://lists.openstreetmap.org/listinfo/talk-ph
Re: [talk-ph] Waterways in NCR and surrounding provinces
exactly my thoughts too it's called tidal estuary many boundaries in metro manila defined by rivers and (vanishing) esteros --- I explore, therefore I blog! http://www.backpackingphilippines.com http://www.facebook.com/backpackingPhilippines http://www.twitter.com/backpackPH On Sep 12, 2013, at 10:22 AM, rem zamora pompy...@gmail.com wrote: Good idea Jim. However it got me thinking also... in the case of Pasig river, the flow of the water depends on the time and tide of the day. Sometimes water flows inward from the bay to Laguna lake but there are times also that the water flows from the lake to the ocean (which is what seems to be natural to me, all water flows toward the ocean). Just a thought. This is the same case also in Malabon and some parts of Bulacan also :) On Sep 12, 2013 9:42 AM, Jim Morgan j...@datalude.com wrote: On Thursday, 12 September, 2013 09:31 AM, maning sambale wrote: In some cases, we had to switch the way direction to follow the the convention [0] that the direction of the way should be downstream Hah, I'd never really thought of this before. I guess a lot of times I start tracing from the sea backwards inland, so I've probably got this wrong a few times. It started me thinking though. If you were able to get the elevation data for the start point and end point of a waterway, you could probably work out the direction of flow from that, and apply it automagically. So what about canals? :-) Jim ___ talk-ph mailing list talk-ph@openstreetmap.org https://lists.openstreetmap.org/listinfo/talk-ph ___ talk-ph mailing list talk-ph@openstreetmap.org https://lists.openstreetmap.org/listinfo/talk-ph ___ talk-ph mailing list talk-ph@openstreetmap.org https://lists.openstreetmap.org/listinfo/talk-ph
